physics

a car moves at constant speed around a horizontal circular track. resultant force =

B

what is the force on string II? a. 28 b. 21 c. 19 d. 17

B

the graph above represents position x vs time t for an object being acted on by a constant force. the avg speed during the interval between 1 and 2 s is most nearly a. 2 b. 3 c. 4 d. 6

D

a 2 kg mass and a 4 kg mass on a horizontal frictionless surface are connected by a massless string A. they are pulled horizontally across the surface by a second string B with a constant acceleration of 12 m/s/s. what is the magnitude of the the force of string B on the 2 kg mass. a. 72 b. 48 c. 24 d. 6

A

an airplane went from 120 m/s to 180 m/s in 4 s. what acceleration? a. 15 b. 30 c. 45 d. 60

A

a small box is on a ramp tilted at an angle é above the horizontal. the box may be subject to the following forces: frictional, gravitational, pulling or pushing, and normal. in the following free body diagrams for the box, the lengths of the vectors are proportional to the magnitudes of the forces. which figure best represents the free body diagram for the box if it is accelerating up the ramp?

D

a student adds 2 displacement vectors with magnitudes of 3m and 4m. which one of the following could not be a possible choice for the resultant? a. 3.3 b. 5 c. 6.8 d. 7.8

D

which one of the following is a vector quantity? a. mass b. temperature c. time d. displacement

D

which pair of graphs represent the correct relationship between displacement and the velocity of a moving object?

D

omit

omit

which of the following is the condition for a body to be in translational equilibrium? a. resultant force on the body in any direction is 0 b. velocity of the body in any direction is 0 c. no external force is acting on the body d. no work is done on the body

A

which one of the following answers would give the correct number of sig figs when the following masses are added together: 3.6, 113, 4.9 a. 121 b. 120.8 c. 120.79 d. 120.8x10^3

A

calculator

calculator

a diver initially moving horizontally with speed v dives off the edge of a vertical cliff and lands in the water a distance d from the base of the cliff. how far from the base of the cliff would the diver have landed if the diver initially had been moving horizontally with speed v/2? a. d/2 b. d/√2 c. d d. d/4

A

a person pushes a block of mass 6 kg with a constant speed of 5 m/s straight up a flat surface inclined 30 degrees above the horizontal. the coefficient of friction is .4. what is the net force acting on the block? a. 0 b. 21 c. 30 d. 76

A

a person weighing 800 N on earth travels to another planet w 2x mass and 2x radius of earth. this persons weight on the other planet is most nearly a. 400 b. 800/√2 c. 800 d. 800/√2

A

which of the following best describes the acceleration of the ball? a. it is downward and constant from 0 to 6s b. downward and inc in magnitude 0 to 3 s, then decrease c. downward and decrease magnitude 0 to 3, then inc d. upward and dec in magnitude 0 to 3, the inc

A

which of the following correctly gives the mass and the weight of the object as the lift is moving upwards at constant velocity? a. M,W b. M, greater than W c. greater than M, W d. greater than M, greater than W

A

which statement about the acceleration of an object is correct? a. the acceleration of an object is directly proportional to the net external force acting on the object and inversely proportional to the mass of the object b. the acceleration of an object is directly proportional to the net external force acting on the object and directly proportional to the mass of the object c. the acceleration of an object is inversely proportional to the net external force acting on the object and inversely proportional to the mass of the object d. the acceleration of an object is inversely proportional to the net external force acting on the object and directly proportional to the mass of the object

A

which of the following forces opposes the down weight of the suitcase? a. the upward pull of the girl on the suitcase b. the downward weight of the girl c. the normal force of the floor on the girl d. the normal force of the floor on the suitcase

A and D

2 identical balls are dropped from a tall building, one a few seconds after the other. as the balls fall, the distance between the balls will a. dec b. inc c. inc then remain constant d. remain constant

B

2 block x and y are in contact on a horizontal frictionless surface. a 36 N constant force is applied to x as shown to the R. the force exerted by x on y is a. 1.5 b. 6 c. 30 d. 36

C

a 20 N physics textbook rests on a table. what is the force the table exerts on the textbook a. 0 b. 9.8 c. 20 d. 40

C

the sum of the forces on the object is 0 in which of the cases? a. II only b. III only c. I and II d. I and III

C

which of the following motion vector diagrams represents accelerated motion?

C

the velocity of a projectile at launch has a horizontal component Vh and a vertical component Vv. When the projectile is at the highest point of trajectory, which of the following show the vertical and horizontal components of its velocity and the vertical component of its acceleration?

D

which are simultaneous equal but opposite forces resulting from the interaction of 2 objects a. net external forces b. field forces c. gravitational forces d. action-reaction pairs

D

which arrow will strike the ground first? a. 1 b. 4 c. 1 and 2 d. all at same time

D

which one of the following choices is equivalent to 8 m^2? a. 8x10^-4 b. 8x10^2 c. 8x10^-2 d. 8x10^4

D

common sense

common sense

a projectile was launched horizontally with a velocity of 468 m/s, 1.86 m above ground. how long did it take the projectile to hit the ground? a. .308 b. .38 c. .616 d. 1.32

C

at which of the following times is the speed of the ball the least? a. 1 b. 2 c. 3 d. 5

C

points p and q are distances R and 2R from the centre x of a disc.

C

saturn takes 29.5 earth years to make a single orbit around the sun. which of the following gives the order of magnitude of this orbit? a. 10^3s b. 10^5s c. 10^6s d. 10^8s

D

the avg speed of a cart during a 15s int is 3 m/s. total distance covered? a. .2 b. 5 c. 18 d. 45

D

during which interval was the cart accelerating? a. I-II b. II-III c. III-IV d. IV-V

A

what is the order of magnitude of mass, in kg, of an apple? a. 10^-3 b. 10^-1 c. 10^1 d. 10^3

B

when a person stands on a merry go round

B

which of the following best represents the position of the ball as it rotates clockwise?

B

which of the following contains one fundamental and one derived unit? a. ampere, kilogram b. ampere, coulomb c. joule, newton d. joule, coulomb

B

which of the following correctly gives the mass and weight of the object as the elevator is accelerating upwards?

B

which of the following represents the direction of the centripetal force F acting on a car traveling in a circular path?

B

a rock is thrown straight down from the top of a cliff with an initial speed of 12 m/s. if the rock hits the ound after 2 s, what is the height of the cliff? a. 22 b. 24 c. 44 d. 63

A

each of the diagrams below represents 2 weights connected by a massless string which passes over a massless, frictionless pulley. in which diagram will the magnitude of the acceleration be the largest?

A

if an object is moving in circular motion due to centripetal force, F , and the radius of its circular motion is then halved, the new force then becomes a. 2F b. F/2 c. 1/F d. F

A

marsha threw a baseball straight up with an acceleration of 14. the ball traveled upward but then accelerated back toward the ground. it eventually fell to the ground where it stopped moving. which graph best represents?

A

the displacement x of an object moving along the x axis shown above as a function of time t. the acceleration of this object must be a. zero b. constant but zero c. increasing d. decreasing

A

what is the cars velocity at 2 s? a. 1.25 b. 2.5 c. 5 d. 10

A

when velocity is positive and acceleration is negative, what happens to the objects motion? a. the object slows down b. the object speeds up c. nothing happens to the object d. the object remains at rest

A

which expression has the same dimensions as an expression yielding a value for acceleration? a. ∆v/∆t b. ∆v/∆x c. ∆v^2/∆t d. ∆v^2/∆x

A

which of the following exhibits projectile motion? a. person diving into pool from diving board b. moon orbiting earth c. acorn falling from oak tree d. train moving along flat track

A

2 objects, X and Y, accelerate from rest with the same constant acceleration. object X accelerates for half the time as object Y. which of the following is true of these objects at the end of their respective periods of acceleration? a. object x is moving at the same speed as object y b. object x is moving two times slower than y c. object x has traveled the same distance as object y d. object x has traveled half as far as object y

B

a massless rope supports a block that weighs 30 N. what is the tension in the rope? a. 15 N throughout the rope b. 30 N throughout the rope c. 45 N throughout the rope d. 60 N throughout the rope

B

a racing car is moving around the circular track of radius 200 m. at the instant when the car's velocity is directed due E, its acceleration is directed due S and has a magnitude of .5 m/s/s. when viewed from above, the car is moving a. clockwise @ 30 m/s b. clockwise at 10 m/s c. counterclockwise @ 30m/s d. counterclockwise @10 m/s

B

a skateboarder rolls 25 m down a hill that descends at an angle of 20 degrees with the horizontal. find the horizontal and vertical components of the skateboarders displacement. a. 8.55, 23.5 b. 23.5, 8.55 c. 23.5, 73.1 d. 73.1, 26.6

B

a tennis ball is dropped from the top of a high building. which graph represents the variation with time t of the magnitude of the acceleration a of the ball before it hits the ground?

B

according to the diagram, the x component of A is a. Atan20 b. Acos20 c. Asin20 d. 0

B

an object is falling towards the earths surface, what changes occur in the velocity as in the acceleration of the object as it approaches terminal velocity? velocity, acceleration a. inc continuously, dec to 0 b. inc to constant value, dec to 0 c. inc to constant value, constant d. inc continuously, constant

B

an object is fired horizontally from the top of building A and follows a free fall trajectory as shown. which vector best represents the direction of the objects acceleration at X?

B

given that the ball lands in one second, how fast did the child throw the ball horizontally? a. 5 m/s b. 50 c. 100 d. 500

B

identify the following quantities as scalar or vector: the speed of a snail, the time it takes to run a mile, the free-fall acceleration. a. vector, scalar, scalar b. scalar, scalar, vector c. vector, scalar, vector d. scalar, vector, vector

B

if the block is placed on a second plane inclined at the same angle, it will begin to accelerate at 2 m/s/s. what is the force of friction between the block and the second inclined plane? a. 10 b. 15 c. 25 d. 43.3

B

if velocity is measured as positive in the direction sown, the velocity of nico relative to aziz is a. -7 b. -3 c. 3 d. 7

B

the mass of a raindrop is 4 milligrams. which one of the following statements indicates the correct mass of the raindrop in grams? a. 4x10^6 b. 4x10^-3 c. 4x10^-1 d. 4X10^3

B

the reading of a constant potential difference is made four times by a student. The student averages these three readings but doesn't take into account the zero error on the voltometer. the avg measurement of the potential difference is a. precise and accurate b. precise but not accurate c. accurate but not precise d. not accurate and not precise

B

values of current I in an electrical component and of the corresponding potential difference V across the component are plotted on a graph. Error bars for each point have been included. which shows best fit line?

B

what does the area bound by this velocity curve and time axis represent? a. acceleration b. displacement c. position d. velocity

B

what is the avg velocity during the interval 3 to 4 s? a. 0 b. 2 c. 3 d. 4

B

what is the avg velocity of the bicyclist between 3 and 9 seconds? a. .56 b. .8 c. 1.7 d. 3.3

B

what is the magnitude of the force of string A on the 4 kg mass? a. 72 b. 48 c. 24 d. 6

B

which of the following is the correct statement of the y-value of the fourth data point, with its uncertainty? a. 3 ± .2 b. 3.2 ± .1 c. 3.2 ± .2 d. 3.2 ± .05

B

which of the vectors best represents the vector c that would satisfy the relation c=x+y?

B

which one of the following gives the final displacement after time T and the avg speed between time t=0 and t=T? a. 0,0 b. 0, 2D/T c. 2D, 2D/2D/T d. 2D, 0

B

If F1 is the force exerted by the earth on a satellite in orbit about the earth and F2 is the magnitude of the force exerted by the satellite on the earth, then which of the following is true. a. f1 is much greater than f2 b. f1 is slightly greater than f2 c. f1 is equal to f2 d. f2 is much greater than f1

C

a 2 kg block rests at the edge of a platform that is 10 m above level ground. the block is launched horizontally from the edge of the platform with an initial speed of 3 m/s. how far from the edge of the platform will the block land? a. 1.4 b. 3.3 c. 4.2 d. 5

C

a 5 kg block rests on a flat plane incline at an angle of 30 to the horizon. what would be the acceleration of the block down the plane assuming the force of friction is negligible? a. .5 b. .87 c. 5 d. 8.7

C

a ball is thrown with a velocity of 17.6 m/s at an angle of 40 degrees to the horizontal. what horizontal distance measured along the ground does the ball travel before striking the ground. a. 15.6 b. 20.3 c. 31.2 d. 40.6

C

a baseball is thrown across a field. which best describes the horizontal components of the balls velocity and acceleration while it is in the air? a. velocity dec, acceleration inc b. velocity 0, acceleration dec c. velocity cons, acceleration 0 d. velocity inc, acceleration dec

C

a duck waddles 2.5 m east and 6 m north. what are the magnitude and direction of the ducks displacement with respect to its original position? a. 3.5 at 19 b. 6.3 at 67 c. 6.5 at 67 d. 6.5 at 72

C

a rock, dropped from rest near the surface of an atmosphere free planet, attains a speed of 20 m/s after falling for .8 sec. what is the magnitude of the acceleration due to gravity on the surface of this planet? a. .4 b. 2.5 c. 25 d. 160

C

a stone of mass 1 kg and weight 10 N falls through the air. air resistance acting on the stone is 2 N. what is the acceleration of the stone? a. 2 b. 5 c. 8 d. 12

C

an object slides off a roof 10 m above the ground with an initial horizontal speed of 5 m/s as shown above. the time between the objects leaving the roof and hitting the ground is most nearly a. 1/2 s b. 1/√2s c. √2s d. 2 s

C

an object weighing 100 N at the earths surface is moved to a distance of 3 earth radii from the surface of the earth. its new weight will be a. 25 b. 33.3 c. 11.1 d. 6.25

C

as shown in the accompanying figure, a force F is exerted at an angle of theta. the block of weight mg is initially moving to the right with speed v. the coefficient of friction between the rough floor and the block is mu. the frictional force acting on the block is. a. (mu)(m)(g) to the L b. (mu)(m)(g) to the R c. mu(mg+Fsintheta) to the L d. mu(mg-Fcostheta) to the R

C

if the velocity of a truck over a given time interval is constant, how does the instantaneous velocity of that truck at any instant during that interval compare to its avg velocity over the int? a. inst velocity greater than avg velocity b. inst velocity less than avg velocity c. inst velocity = avg velocity d. inst velocity vary in value comp to avg velocity

C

in a lab, a block weighing 80 N is attached to a spring scale, and both are pulled to the right on a horizontal surface, as shown above. what is the acceleration of the block when the scale reads 32 a. 2 b. 2.5 c. 4 d. 6

C

justine and her friends exit the physics classroom and walk .81 km to their math class. while walking, justine's average step length is 58 cm. how many steps does she take? a. 310 b. 720 c. 1400 d. 3100

C

sub-multiples of units may be expressed using a prefix. which of the following lists the prefixes in decreasing order of magnitude? a. nano-, micro-, milli-, centi- b. milli-, centi-, nano-, micro- c. centi-, milli-, micro-, nano- d. milli-, micro-, centi-, nano-

C

the sides of a square are measured to be 5 ±.2 cm. which of the following gives the area of the square and its uncertainty? a. 25 ± .2 cm b. 25 ± .4 cm c. 25± 2 cm d. 25 ±4 cm

C

the time it takes for a plane to change its speed from 100 m/s to 500 m/s w a uniform acceleration in a distance of 1200 m is a. 2 b. 3 c. 4 d. 5

C

the voltage drop across a resistor is measured as 6 V ±.1V using a digital multimeter. which of the following correctly identifies the absolute uncertainty and percentage uncertainty in the current? a. ±.1 V, ±10% b. ±.05 V, ±5% c. ±.1 V, ±2% d. ±6 V, ±.02%

C

what does the slope of the line on this graph represent? a. displacement b. avg velocity c. acceleration d. momentum

C

which of the following best expresses the indicated length with its uncertainty? a. 32.5±.1 b. 32.5±.05 c. 32.56±.05 d. 32±.5

C

which of the following describes the aim of the archer? a. precise but not accurate b. accurate but not precise c. precise but not accurate d. neither accurate nor precise

C

2 objects of equal mass are a fixed distance apart. if the mass of each object could be triples, the gravitational force between the objects would a. dec by 1/3 b. dec by 1/9 c. inc x3 d. inc x9

D

a block of mass 2 m can move without friction on a horizontal table. this block is attached to another block of mass 2m by a cord that passes over a frictionless pulley. if the masses of the cord and the pulley are negligible, what is the magnitude of the acceleration of the descending block? a. 0 b. g/4 c. g/3 d. g/2

D

a block of mass m is pushed against a rough, fixed wall by force P. the frictional force between the block and the surface is f, and the normal force is N. which of the following diagrams correctly shows all of the forces acting on the block?

D

a boat moves 2.5 m/s n across a river flowing 1.2 m/s e. what is the speed of the boat relative to the shore? a. 1.3 b. 2.2 c. 2.5 d. 2.8

D

a box with a mass of 50 kg is dragged across the floor by a rope which makes an angle of 30 degrees with the horizontal. which of the following would be closest to the coefficient of kinetic friction between the box and the floor if a 250 N force on the rope is required to move the crate at a constant speed of 20 m/s as shown in the diagram?

D

a hiker travels along a straight path for 1.5 hr with avg velocity 1 km/hr, then travels south for 2.5 hr witha n av velocity of 2 km/h. hikers displacement? a. 1.5 km b. 2 c. 2.5 d. 4

D

a particle is moving in a circular path of radius r. the time taken for one complete revolution is T. the acceleration a of the particle is given by the expression a=4pir/T^2. which of the following graphs would produce a straight line? a. a against t b. a against t^2 c. a against 1/T d. a against 1/T^2

D

a straight track is 1600 m in length. a runner begins at the starting line, runs due east for the full length of the track, turns around, and runs halfway back. what is the total distance covered by the runner, and what is his displacement? a. 2400 m, 2400 m b. 800, 2400 c. 800, 800 d. 2400, 800

D

a toy car is given an initial velocity of 5 m/s and experiences a constant acceleration of 2 m/s^2. what is the final velocity after 6 s> a. 20 b. 12 c. 16 d. 17

D

acceleration is a. displacement b. the rate of change of position c. velocity d. the ROC of velocity

D

complete the following statement: the ratio 1 milligram/ 1 kilogram is equal to a. 10^3 b. 10^6 c. 10^-3 d. 10^-6

D

free fall acceleration is also called a. rest b. negative velocity c. horizontal displacement d. acceleration due to gravity

D

if the objects initial velocity is 0 m/s what is the velocity of the at t=8 s? a. .5 b. 2 c. 12 d. 32

D

inertia can be best described as the a. force that keeps an object in motion with constant velocity b. force that keeps an object at rest c. property responsible for slowing down an object d. property responsible for an objects resistance to changes in motion

D

the mass of a proton is 1.7x10^-27 kg and that of an electron is 9.1x10^-31. which one of the following is the difference in the order of magnitude of the masses of the proton and the electron? a. 10.8 b. 7.4 c. 5.4 d. 3

D

the mathematical relationship between three physical quantities is given by a=b^2/c. if dimension of b is [L]/[T] and the dimension of c is [L], which is the dimension of a? a. [L] b. [T] c. [L]/[T] d. [L]/[T]^2

D

the net force acting on a body is 0. which of the following quantities must also have zero magnitude for this body? a. displacement b. velocity c. speed d. acceleration

D