Physics Conceptual Questions Exam 3
. Which one of the following expressions gives the correct relationship between pressure and force? a) P = F/A b) P = FA c) P = F/A2 d) P = A/F e) There is no relationship between pressure and force.
a) P = F/A
Which one of the following statements concerning Hooke's law is false? a) Hooke's law can be applied to a wide variety of solids. b) Hooke's law is valid only for springs. c) Hooke's law can be verified experimentally. d) Hooke's law can be applied to a wide range of materials. e) Hooke's law is valid only within the elastic limit of a given material.
b) Hooke's law is valid only for springs.
Complete the following sentence: The operation of a hydraulic jack is an application of a) Archimedes' principle. b) Bernoulli's principle. c) Pascal's principle. d) the continuity equation. e) irrotational flow.
c) Pascal's principle.
Which one of the following expressions allows one to calculate the angular momentum for a rigid body about a fixed axis? a) (1/2)Iw2 b) (1/2)MR2 c) 2Iw d) Iw e) (1/2)MRv
d) Iw
Complete the following statement: In general, the term stress refers to a) a change in length. b) a change in volume. c) a fractional change in length. d) a force per unit length. e) a force per unit area.
e) a force per unit area.
Which one of the following statements concerning the elastic potential energy of a ball attached to a spring is true when the ball is moving in simple harmonic motion? a) The elastic potential energy is at its minimum when the spring is in its equilibrium position. b) The elastic potential energy is smaller when the ball is at -x than when it is at +x. c) The elastic potential energy can be expressed in units of watts/seconds. d) The elastic potential energy is at its maximum when the velocity of the ball is a maximum. e) The elastic potential energy is at its minimum when the acceleration of the ball is a maximum.
a) The elastic potential energy is at its minimum when the spring is in its equilibrium position.
Two solid spheres have the same mass, but one is made from lead and the other from wood. How do the moments of inertia of the two spheres compare? a) The moment of inertia of the lead sphere is greater than that of the one made of wood. b) The moment of inertia of the wood sphere is greater than that of the one made of lead. c) The moment of inertia of the wood sphere is the same as that of the one made of lead. d) There is no way to compare the spheres without knowing their radio
b) The moment of inertia of the wood sphere is greater than that of the one made of lead.
A ball moves in a circular path on a horizontal, frictionless surface as shown. It is attached to a light string that passes through a hole in the center of the table. If the string is pulled down, thereby reducing the radius of the path of the ball, the speed of the ball is observed to increase. Which one of the following statements provides an explanation for this increase? a) When the string is pulled downward, the angular momentum must increase. b) The total mechanical energy of the ball must remain constant because energy is conserved. c) The angular momentum of the ball is conserved in this process. d) The linear momentum of the ball is conserved in this process. e) This follows directly from applying Newton's third law of motion.
c) The angular momentum of the ball is conserved in this process
Which one of the following statements does not describe a property of fluids in motion? a) The fluid flow can be steady or unsteady. b) The fluid flow can be compressible or incompressible. c) The fluid flow can be steadfast or unreliable. d) The fluid flow can be viscous or nonviscous. e) The fluid flow can be turbulent or streamline.
c) The fluid flow can be steadfast or unreliable.
A force is applied to a doorknob. This force will be most effective in causing the door to rotate when which of the following is true? a) The lever arm is parallel to the direction of the force. b) The lever arm length is zero meters. c) The direction of the force is at an angle of 45 with respect to the door. d) The direction of the force is at an angle of 90 with respect to the door. e) The lever arm is perpendicular to the door.
d) The direction of the force is at an angle of 90 with respect to the door.
A water skier is pulled by a boat traveling with a constant velocity. Which one of the following statements is false concerning this situation? a) The water skier is in equilibrium. b) The net acceleration of the skier is zero m/s2. c) The net force on the skier is zero newtons. d) There is a net horizontal force on the skier in the direction the boat's velocity. e) The net vertical force on the skier is zero newtons.
d) There is a net horizontal force on the skier in the direction the boat's velocity.
Which one of the following choices is produced when a constant net torque is applied to a rigid object? a) a constant linear acceleration of the object b) a constant angular velocity of the object c) a rotational equilibrium of the object d) a change in the angular velocity of the object e) a constant angular displacement of the object
d) a change in the angular velocity of the object
The wheels of a bicycle roll without slipping on a horizontal road. The bicycle is moving due east at a constant velocity. What is the direction of the angular velocity of the wheels? a) down b) west c) east d) north e) south
d) north
Which one of the following is the SI unit for angular velocity? a) revolutions per minute (rpm) b) meters per second (m/s) c) degrees per minute (/min) d) radians per second (rad/s) e) tychos per second (ty/s)
d) radians per second (rad/s)
A solid cylinder is rolling along a flat, horizontal plane. The center of mass of the cylinder is moving toward the south at constant velocity. Which one of the following statements concerning the translational and rotational kinetic energies of the cylinder is true? a) The translational kinetic energy is greater than the rotational kinetic energy. b) The translational kinetic energy is less than the rotational kinetic energy. c) The translational kinetic energy is equal to the rotational kinetic energy. d) The sum of the translational and rotational kinetic energies equals the gravitational potential energy of the cylinder. e) The sum of the translational and rotational kinetic energies equals zero joules
a) The translational kinetic energy is greater than the rotational kinetic energy.
Which of the following devices is used to measure gauge pressure? a) manometer b) barometer c) sphygmomanometer d) pascalometer e) dynamometer
a) manometer
A hoop rolls without slipping on a horizontal surface and it moves due east at a constant linear speed. What is the direction of its angular momentum? a) north b) east c) south d) west e) downward
a) north
For a given circle, the radian is defined as which one of the following expressions? a) the arc length divided by the radius of the circle b) pi (3.141592...) times twice the radius of the circle c) two times ninety degrees divided by pi (3.141592...) d) the arc length divided by the circumference of the circle e) the arc length divided by the diameter of the circle
a) the arc length divided by the radius of the circle
Which of the following is equal to the Earth's atmospheric pressure at sea level? a) 1.602 × 104 Pa b) 1.013 × 105 Pa c) 1.091 × 106 Pa d) 1.311 × 107 Pa e) 2.709 × 107 Pa
b) 1.013 × 105 Pa
A unit of torque is which of the following? a) newtons (N) b) N x m c) kg/s2 d) kg x m2 e) angular newtons (aN)
b) N x m
Which one of the following statements concerning the buoyant force on an object submerged in a liquid is true? a) The buoyant force will increase with depth if the liquid is incompressible. b) The buoyant force depends on the volume of the liquid displaced. c) The buoyant force depends on the weight of the object. d) The buoyant force depends on the mass of the object. e) The buoyant force is independent of the density of the liquid.
b) The buoyant force depends on the volume of the liquid displaced.
Which of the following choices is equivalent to the SI unit of pressure, the pascal? a) N/m b) N/m x s2 c) kg/(m x s2) d) N/s e) kg x m/s2
c) kg/(m x s2)
Which one of the following equations is only valid if and when the angular measure is expressed in radians? a.) wf=wi + 2a0 b.) 0=1/2at^2 + wt c.) w= (vt/r) d.) w= 0/t e.) a= w/t
c.) w= (vt/r)
Under what circumstances will an object that is solid throughout float on water? a) A totally solid object can never float on water because it needs to have air in it. b) If the shape of the object is like that of a boat, it will float. c) A totally solid object can float on water if its volume is greater than the volume of water it is placed in. d) A totally solid object can float on water if its density is less than the density of water. e) A totally solid object can float on water if its density is greater than the density of water.
d) A totally solid object can float on water if its density is less than the density of water.
Which one of the following statements concerning streamline flow is true? a) Streamline flow is described by Pascal's principle. b) Streamline flow is described by Archimedes' principle. c) The velocity vectors are the same for all particles in the fluid. d) At any given point in the fluid, the velocity is constant in time. e) Streamline flow occurs when there are sharp obstacles in the path of a fast-moving fluid.
d) At any given point in the fluid, the velocity is constant in time.
Which one of the following units is used for frequency? a) oersted b) second c) farad d) hertz e) gauss
d) hertz
Angles are often measured in radians. How many degrees are there in one radian? a) 0.0175 b) 1.57 c) 3.14 d) 16.3 e) 57.3
e) 57.3
Which one of the following substances is not a fluid? a) mercury b) air c) water d) liquid nitrogen e) all of the above are fluids
e) all of the above are fluids
. A block on a frictionless surface is attached to a horizontal spring that is stretched and released. Complete the following statement: The work done by the spring on the block a) depends on the frequency of the oscillation. b) is positive only when the spring is compressed. c) is positive only when the spring is stretched. d) is always negative. e) depends on the distance the spring is stretched from its relaxed position.
e) depends on the distance the spring is stretched from its relaxed position.
Which law, principle, or equation can be used to determine the volume flow rate of a liquid that is forced through a hypodermic needle? a) Archimedes' principle b) Pascal's principle c) Poiseuille's law d) the equation of continuity e) Bernoulli's equation
c) Poiseuille's law
Which one of the following statements concerning a completely enclosed fluid is true? a) Any change in applied pressure on the fluid produces an equal change in pressure at all points within the fluid. b) An increase in pressure in one part of the fluid results in an corresponding decrease in pressure in another part. c) The pressure at all points within the fluid is independent of any pressure applied on it. d) Any change in the applied pressure on the fluid produces a change in pressure that depends on direction. e) The pressure in the fluid is the same at all points within the fluid.
a) Any change in applied pressure on the fluid produces an equal change in pressure at all points within the fluid.
Which one of the following statements best describes streamline flow in fluids. a) At a given point on a streamline, the fluid velocity is constant. b) At all points along a streamline, the fluid velocity is constant. c) Fluid particles only move along streamlines within the fluid. Particles not on a streamline do not move. d) All particles within the fluid follow straight lines called streamlines and their velocity is constant. e) At a given point on a streamline, the fluid velocity is varying, but the average velocity along the streamline is constant.
a) At a given point on a streamline, the fluid velocity is constant.
4. A block of mass M is attached to one end of a spring that has a spring constant k. The other end of the spring is attached to a wall. The block is free to slide on a frictionless floor. The block is displaced from the position where the spring is neither stretched nor compressed and released. It is observed to oscillate with a frequency f. Which one of the following actions would increase the frequency of the motion? a) Decrease the mass of the block. b) Increase the length of the spring. c) Reduce the spring constant. d) Reduce the distance that the spring is initially stretched. e) Increase the distance that the spring is initially stretched.
a) Decrease the mass of the block.
A ball of mass m is attached to the end of a spring that has a spring constant k. When the ball is displaced from its equilibrium position and released, it moves in simple harmonic motion. Consider the relationship between the angular frequency, the mass, and the spring constant given in the text. Which one of the following statements concerning that relationship is true? a) Increasing the spring constant causes the angular frequency to increase. b) Increasing the mass of the ball causes the angular frequency to increase. c) Increasing the initial displacement before releasing the ball causes the angular frequency to increase. d) Increasing the period of the ball's motion causes the angular frequency to increase.
a) Increasing the spring constant causes the angular frequency to increase.
Which one of the following statements correctly relates the centripetal acceleration and the angular velocity? a) The centripetal acceleration is the product of the radius and the square of the angular velocity. b) The centripetal acceleration is the square of the angular velocity divided by the radius. c) The centripetal acceleration is the product of the radius and the angular velocity. d) The centripetal acceleration is the angular velocity divided by the radius. e) The centripetal acceleration is independent of the angular velocity.
a) The centripetal acceleration is the product of the radius and the square of the angular velocity.
Two dams are identical with the exception that the water reservoir behind dam A extends twice the horizontal distance behind it as that of dam B. Which one of the following statements regarding these dams is correct? a) The horizontal distance of the water behind the two dams does not determine the force on the dams. b) Dam A is more likely to collapse than dam B if the water level rises. c) Dam B is more likely to collapse than dam A if the water level rises. d) The force exerted by the water on dam A is greater than that on dam B. e) The force exerted by the water on dam B is greater than that on dam A.
a) The horizontal distance of the water behind the two dams does not determine the force on the dams.
An object, which is considered a rigid body, is in equilibrium. Which one of the following statements is false when determining the forces and torques acting on the object? a) The linear acceleration and/or the angular acceleration of the object may not be equal to zero. b) The location of the rotational axis is arbitrary. Therefore, it can be placed at any point on the object that is convenient. c) In placing an x-y coordinate system on the object, the +x direction is arbitrary and it can be directed toward any direction that is convenient. d) A free body diagram of the external forces acting on the object is useful in analyzing this situation. e) The sum of the torques due to external forces must equal zero N x m.
a) The linear acceleration and/or the angular acceleration of the object may not be equal to zero
A block is hung vertically at the end of a spring. When the block is displaced and released, it moves in simple harmonic motion. Which one of the following statements is true concerning the block? a) The maximum acceleration of the block occurs when its velocity is zero. b) The velocity of the block is never zero m/s. c) If the velocity of the block is zero m/s, it acceleration is zero m/s2. d) The maximum velocity occurs when the maximum acceleration occurs.
a) The maximum acceleration of the block occurs when its velocity is zero.
Which one of the following statements concerning the moment of inertia is false? a) The moment of inertia depends on the angular acceleration of the object as it rotates. b) The moment of inertia may be expressed in units of kg x m2. c) The moment of inertia depends on the orientation of the rotation axis relative to the particles that make up the object. d) Of the particles that make up an object, the particle with the smallest mass may contribute the greatest amount to the moment of inertia. e) The moment of inertia depends on the location of the rotation axis relative to the particles that make up the object.
a) The moment of inertia depends on the angular acceleration of the object as it rotates.
An object is rolling, so its motion involves both rotation and translation. Which one of the following statements must be true concerning this situation? a) The total mechanical energy is equal to the sum of the translational and rotational kinetic energies plus the gravitational potential energy of the object. b) The translational kinetic energy may be equal to zero joules. c) The gravitational potential energy must be changing as the object rolls. d) The rotational kinetic energy must be constant as the object rolls. e) The total mechanical energy is equal to the sum of the translational kinetic energy and the gravitational potential energy of the object.
a) The total mechanical energy is equal to the sum of the translational and rotational kinetic energies plus the gravitational potential energy of the object.
s an object rotates, its angular speed increases with time. Complete the following statement: The total acceleration of the object is given by a) the vector sum of the centripetal acceleration and the tangential acceleration. b) the vector sum of the angular velocity and the tangential acceleration divided by the elapsed time. c) the angular acceleration. d) the centripetal acceleration. e) the tangential acceleration.
a) the vector sum of the centripetal acceleration and the tangential acceleration.
Which one of the following statements concerning simple harmonic motion is false? a) The displacement versus time graph for an object in simple harmonic motion resembles the sine or cosine function. b) A restoring force acts on an object in simple harmonic motion that is directed in the same direction as the object's displacement. c) The amplitude of the object in simple harmonic motion is the maximum distance the object moves from its equilibrium position. d) During simple harmonic motion, the net force on the object is zero newtons when it is at its equilibrium position. e) A restoring force acts on the object that is proportional to the object's displacement from its equilibrium position.
b) A restoring force acts on an object in simple harmonic motion that is directed in the same direction as the object's displacement.
Which one of the following statements best explains why the pressure in a static fluid increases as the depth increases? a) The density of the fluid increases with depth. b) As the depth increases, the weight of the water above a particular level increases. c) As the depth increases, the density of the fluid decreases. d) As depth increases, the gravitational force of the earth on the water increases. e) The temperature of the water decreases with depth.
b) As the depth increases, the weight of the water above a particular level increases
Two points are located on a rigid wheel that is rotating with a decreasing angular velocity about a fixed axis. Point A is located on the rim of the wheel and point B is halfway between the rim and the axis. Which one of the following statements is true concerning this situation? a) Both points have the same centripetal acceleration. b) Both points have the same instantaneous angular velocity. c) Both points have the same tangential acceleration. d) Each second, point A turns through a greater angle than point B. e) The angular velocity at point A is greater than that of point B.
b) Both points have the same instantaneous angular velocity.
The SI unit for angular displacement is the radian. In calculations, what is the effect of using the radian? a) Any angular quantities involving the radian must first be converted to degrees. b) Since the radian is a unitless quantity, there is no effect on other units when multiplying or dividing by the radian. c) Since the radian is a unitless quantity, any units multiplied or divided by the radian will be equal to one. d) Since the radian is a unitless quantity, the number of radians of angular displacement plays no role in the calculation. e) The result of the calculation will always have the radian among the units.
b) Since the radian is a unitless quantity, there is no effect on other units when multiplying or dividing by the radian.
A child standing on the edge of a freely spinning merry-go-round moves quickly to the center. Which one of the following statements is necessarily true concerning this event and why? a) The angular speed of the system decreases because the moment of inertia of the system has decreased. b) The angular speed of the system increases because the moment of inertia of the system has decreased. c) The angular speed of the system increases because the moment of inertia of the system has increased. d) The angular speed of the system decreases because the moment of inertia of the system has increased. e) The angular speed of the system remains the same because the net torque on the merry-go-round is zero N x m.
b) The angular speed of the system increases because the moment of inertia of the system has decreased.
A flat disk, a solid sphere, and a hollow sphere each have the same mass m and radius r. The three objects are arranged so that an axis of rotation passes through the center of each object. The rotation axis is perpendicular to the plane of the flat disk. Which of the three objects has the largest moment of inertia? a) The solid sphere and hollow sphere have the same moment of inertia; and it is the largest. b) The hollow sphere has the largest moment of inertia. c) The solid sphere has the largest moment of inertia. d) The flat disk has the largest moment of inertia. e) The flat disk and hollow sphere have the same moment of inertia; and it is larger than that of the solid sphere.
b) The hollow sphere has the largest moment of inertia.
An object that obey's Hooke's law is displaced a distance x by a net force F. Which one of the following statements correctly describes the resulting acceleration of the object? a) The magnitude of the acceleration is constant. b) The magnitude of the acceleration increases as x increases and it decreases as x decreases. c) The acceleration is always in the positive x direction. d) The acceleration is only dependent on the mass of the object.
b) The magnitude of the acceleration increases as x increases and it decreases as x decreases.
Which of the following devices is used to measure atmospheric pressure? a) manometer b) barometer c) sphygmomanometer d) pascalometer e) dynamometer
b) barometer
Complete the following statement: Bernoulli's principle is a statement of a) momentum conservation in dynamic fluids. b) energy conservation in dynamic fluids. c) mechanical equilibrium in fluids. d) thermal equilibrium in fluids. e) hydrostatic equilibrium.
b) energy conservation in dynamic fluids.
Complete the following statement: When determining the net torque on a rigid body, only the torques due to a) internal forces are considered. b) external forces are considered. c) only forces that are either parallel or perpendicular to the lever arm are considered. d) forces that form action-reaction pairs as in applying Newton's third law of motion are considered. e) both internal and external forces are considered.
b) external forces are considered.
Which one of the following choices represents the SI units for angular momentum? a) kg x m/s2 b) kg x m2/s c) kg x m2/s2 d) kg x m x rad/s2 e) kg x rad/s2
b) kg x m2/s
The pressure at a point in a fluid in static equilibrium depends on which of the following? a) the total depth of the fluid b) the depth of the given point c) the total volume of fluid d) both choices (a) and (b) e) both choices (a) and (c)
b) the depth of the given point
Complete the following statement: Pressure is a measure of a) the force exerted by a fluid. b) the force per unit area that a fluid exerts. c) the force per unit time that a fluid exerts. d) the impulse of a fluid. e) the energy in a fluid.
b) the force per unit area that a fluid exerts.
While putting in a new ceiling, Jake uses a drill to put screws into the drywall. The screws rotate clockwise as they go into the ceiling. What is the direction of the angular velocity of the screw as the drill drives it into the ceiling? Express the direction relative to Jake, who is looking upward at the screw. a) down b) up c) left d) right e) forward
b) up
Which one of the following statements best describes the pressure in a static, homogeneous liquid? a) The pressure is the same at all points in the fluid. b) The pressure is not dependent on the atmospheric pressure exerted at the surface of the liquid. c) At a given depth in the liquid, the pressure is the same at all points at that depth. d) The pressure depends on the type of liquid such that the denser the liquid is, the smaller the pressure will be. e) The pressure decreases as the depth increases.
c) At a given depth in the liquid, the pressure is the same at all points at that depth.
A simple pendulum consists of a ball of mass m suspended from the ceiling using a string of length L. The ball is displaced from its equilibrium position by a small angle and released. Which one of the following statements concerning this situation is correct? a) If the mass were increased, the period of the pendulum would increase. b) The frequency of the pendulum does not depend on the acceleration due to gravity. c) If the length of the pendulum were increased, the angular frequency of the pendulum would decrease. d) The period of the pendulum does not depend on the length of the pendulum. e) The angular frequency would double if the angle 0 were doubled.
c) If the length of the pendulum were increased, the angular frequency of the pendulum would decrease.
Which one of the following statements most accurately describes the center of gravity of an object? a) It is the only point where gravity acts on the object. b) It is the point on the object where all the weight is concentrated. c) It is the point from which the torque produced by the weight of the object can be calculated. d) It must be experimentally determined for all objects. e) It is the point where all the mass is concentrated.
c) It is the point from which the torque produced by the weight of the object can be calculated.
A piece of paper is laying flat on a desk near a closed window. When the window is opened, air rushes over the top of the desk and the paper is observed to be lifted upward and then carried away by the wind. Which of the following statements best describes why the paper was lifted from the desk? a) The paper was attracted by the force of the wind. b) The pressure of the moving air above the paper was greater than that of the air between the paper and the desk top. c) The pressure of the moving air above the paper was less than that of the air between the paper and the desk top. d) The weight of the paper was reduced by the wind blowing over it and the normal force of the desk was then greater than the weight. The normal force pushes the paper upward. e) The wind pushed the side of the paper and lifted it upward.
c) The pressure of the moving air above the paper was less than that of the air between the paper and the desk top.
A block is attached to the end of a spring. The block is then displaced from its equilibrium position and released. Subsequently, the block moves back and forth on a frictionless surface without any losses due to friction. Which one of the following statements concerning the total mechanical energy of the block-spring system this situation is true? a) The total mechanical energy is only kinetic energy since there is no change in the gravitational potential energy. b) The total mechanical energy is at its maximum when the block is at its equilibrium position. c) The total mechanical energy is constant as the block moves back and forth. d) The total mechanical energy is only dependent on the spring constant and the mass of the block.
c) The total mechanical energy is constant as the block moves back and forth.
There is a restaurant on top of a tall, circular building that is designed to rotate about its center at a constant angular speed. Which one of the following quantities is non-zero and constant for one of the restaurant's customers seated near a window? a) linear velocity b) centripetal acceleration c) angular momentum d) angular acceleration
c) angular momentum
The wheels of a NASCAR racer roll without slipping as the car moves in a circular path at constant speed. Which one of the following quantities has a non-zero value and has a constant value in this situation? a) linear velocity b) centripetal acceleration c) angular velocity d) angular acceleration e) total acceleration
c) angular velocity
An object in simple harmonic motion is observed to move between a maximum position and a minimum position. The minimum time that elapses between the object being at its maximum position and when it returns to that maximum position is equal to which of the following parameters? a) frequency b) angular frequency c) period d) amplitude e) wavelength
c) period
Which of the following devices is used to measure blood pressure? a) manometer b) barometer c) sphygmomanometer d) pascalometer e) dynamometer
c) sphygmomanometer
An object, which is considered a rigid body, is not in equilibrium. Which one of the following statements must be true concerning the magnitude of the angular acceleration alpha and translational acceleration a of the object? a) alpha = 0 rad/s2 and a = 0 m/s2 b) alpha > 0 rad/s2, but a = 0 m/s2 c) a > 0 m/s2, but alpha = 0 rad/s2 d) alpha > 0 rad/s2 and a > 0 m/s2 e) Either alpha > 0 rad/s2 or a > 0 m/s2
e) Either alpha > 0 rad/s2 or a > 0 m/s2
Complete the following statement: When an object is placed in a fluid, a buoyant force is exerted on it that is directed upward with a magnitude a) that is greater than the force of gravity on the object. b) that is greater than the weight of the fluid displaced by the object. c) that is equal to the weight of the fluid displaced by the object. d) that is less than the weight of the fluid displaced by the object. e) that is equal to the force of gravity on the object.
c) that is equal to the weight of the fluid displaced by the object.
The moment of inertia of a wheel about its axle does not depend on which one of the following properties? a) the mass of the wheel b) the diameter of the wheel c) the angular velocity of the wheel as it rotates d) the location of the particles that compose the wheel
c) the angular velocity of the wheel as it rotates
Under which one of the following conditions does the motion of a simple pendulum approximate simple harmonic motion? a) when the pendulum swings rapidly b) when the pendulum swings slowly c) when the pendulum swings through a small angle d) when the pendulum swings through a large angle e) when the length of the pendulum is more than twice the diameter of the bob
c) when the pendulum swings through a small angle
Which one of the following statements best describes fluids? a) Fluids are liquids. b) Fluids are gases. c) Fluids are transparent. d) Fluids are gases or liquids. e) Fluids are opaque
d) Fluids are gases or liquids.
The jet engine has angular acceleration of 2.5 rad/s2. Which one of the following statements is correct concerning this situation? (Assume counterclockwise is positive.) a) The direction of the angular acceleration is counterclockwise. b) The direction of the angular velocity must be clockwise. c) The angular velocity must be decreasing as time passes. d) If the angular velocity is clockwise, then its magnitude must increase as time passes. e) If the angular velocity is counterclockwise, then its magnitude must increase as time passes
d) If the angular velocity is clockwise, then its magnitude must increase as time passes.
Which one of the following actions will take place if an object in unstable equilibrium is slightly displaced? a) The object will move in the direction opposite that of the displacement. b) The object will stop moving as soon as it reaches a place of stable equilibrium. c) Its kinetic energy will decrease. d) Its potential energy will decrease
d) Its potential energy will decrease
Which one of the following statements concerning the total mechanical energy of a harmonic oscillator at a particular point in its motion is true? a) The mechanical energy depends only on the acceleration at that point. b) The mechanical energy depends only on the velocity at that point. c) The mechanical energy depends only on the position of that point. d) The mechanical energy does not vary during the motion. e) The mechanical energy is equal to zero joules if the point is the equilibrium point.
d) The mechanical energy does not vary during the motion.
Which law, principle, or equation specifies that the mass flow rate of a fluid at two positions along a tube must be constant? a) Archimedes' principle b) Pascal's principle c) Poiseuille's law d) equation of continuity e) Bernoulli's equation
d) equation of continuity
A simple pendulum consists of a ball of mass m suspended from the ceiling using a string of length L. The ball is displaced from its equilibrium position by an angle 0 and released. What is the magnitude of the restoring force that moves the ball toward its equilibrium position and produces simple harmonic motion? a) kx b) mg c) mg (cos 0) d) mg (sin 0) e) mgL (sin 0)
d) mg (sin 0)
2. Consider the following situation: one of the wheels of a motor cycle is initially rotating at 39 rad/s. The driver then accelerates uniformly at 7.0 rad/s2 until the wheels are rotating at 78 rad/s. Which one of the following expressions can be used to find the angular displacement of a wheel during the time its angular speed is increasing? a.) w=wb-wa b.) 0=wbt + 1/2w^2 c.) w= 1/2(wb + w)^2 d.) wf^2= wi^2 + 2a0 e.) 0= (1/2)(wf - wi)/(a)
d.) wf^2= wi^2 + 2a0
In which one of the following cases is the pressure exerted on the ground by the man the largest? a) A man stands with both feet flat on the ground. b) A man stands with one foot flat on the ground. c) A man lies with his back flat on the ground. d) A man kneels with both knees on the ground. e) A man stands with the toes of one foot on the ground.
e) A man stands with the toes of one foot on the ground.
What happens when a spinning ice skater draws in her outstretched arms? a) Her moment of inertia decreases causing her to slow down. b) Her angular momentum decreases. c) The torque that she exerts increases her moment of inertia. d) Her angular momentum increases. e) Her moment of inertia decreases causing her to spin faster.
e) Her moment of inertia decreases causing her to spin faster.
A U-shaped tube is connected to a flexible tube that has a membranecovered funnel on the opposite end as shown in the drawing. Jason finds that no matter which way he orients to membrane, the height of the liquid in the U-shaped tube does not change. Which one of the following choices best describes this behavior? a) Archimedes' principle b) Bernoulli's principle c) irrotational flow d) the continuity equation e) Pascal's principle
e) Pascal's principle
. A block of mass M is attached to one end of a spring that has a spring constant k. The other end of the spring is attached to a wall. The block is free to slide on a frictionless floor. The block is displaced from the position where the spring is neither stretched nor compressed and released. It is observed to oscillate with a frequency f. Which one of the following statements is true concerning the motion of the block? a) The block's acceleration is constant. b) The period of its motion depends on its amplitude. c) The block's acceleration is greatest when the spring returns to its equilibrium position. d) The block's velocity is greatest when it reaches its maximum displacement. e) The block's acceleration is greatest when the mass has reached its maximum displacement
e) The block's acceleration is greatest when the mass has reached its maximum displacement
An object is in simple harmonic motion. The rate at which the object oscillates may be described using the period T, the frequency f, and the angular frequency . If the angular frequency decreases, what is the effect on the period and the frequency? a) The frequency would decrease, but the period would remain the same. b) The period would increase, but the frequency would remain the same. c) Both the period and the frequency would decrease. d) Both the period and the frequency would increase. e) The period would increase, and the frequency would decrease.
e) The period would increase, and the frequency would decrease
A deep space probe is rotating about a fixed axis with a constant angular acceleration. Which one of the following statements concerning the tangential acceleration of any point on the probe is true? a) The probe's tangential acceleration is constant in both magnitude and direction. b) The magnitude of the probe's tangential acceleration is zero m/s2. c) The tangential acceleration depends on the angular velocity of the probe. d) The tangential acceleration is to equal the centripetal acceleration of the probe. e) The tangential acceleration depends on the change in the probe's angular velocity
e) The tangential acceleration depends on the change in the probe's angular velocity
Which one of the following descriptions indicates that the object is in translational equilibrium? a) Translational equilibrium occurs only if the object is at rest. b) Translational equilibrium occurs only if the object is moving with constant acceleration. c) Translational equilibrium occurs only if the object is at moving with constant (but not zero) velocity. d) Translational equilibrium occurs if the object is moving with constant velocity or with constant acceleration. e) Translational equilibrium occurs if the object is at rest or moving with constant velocity.
e) Translational equilibrium occurs if the object is at rest or moving with constant velocity
Which one of the following statements is false concerning the derivation or usage of Bernoulli's equation? a) Streamline flow is assumed. b) The fluid must be incompressible. c) The fluid must be non-viscous. d) The work-energy theorem is used to derive Bernoulli's equation. e) Vertical distances must be measured relative to the lowest point within the fluid.
e) Vertical distances must be measured relative to the lowest point within the fluid.
A ball is attached to a vertical spring. The ball is initially supported at a height y so that the spring is neither stretched nor compressed. The ball is then released from rest and it falls to a height y - h before moving upward. Consider the following quantities: translational kinetic energy, gravitational potential energy, elastic potential energy. When the ball was at a height y - (h/2), which of the listed quantities has values other than zero joules? a) translational kinetic energy only b) gravitational potential energy only c) elastic potential energy only d) translational and elastic potential energies only e) translational kinetic, gravitational potential, and elastic potential energies
e) translational kinetic, gravitational potential, and elastic potential energies