physics
If one sphere has a mass of 2 kg and an electric charge of +4 μC while another sphere, 3 meters away, has a mass of 1 kg and an electric charge of +5 μC, what is the acceleration of the more massive sphere?
0.01 m/s^2 Fe=k[(C1C20/d]
Two lenses that are 30 centimeters apart are used to form an image. Lens 1 has a focal length f1 = -5.0 cm, and lens 2 has a focal length f2 = 15 cm. The object is placed 20 centimeters to the left of Lens 1. Which of the following statements best describes the image formed? Choose 1 answer: Choose 1 answer: (Choice A)AThe image formed by Lens 2 is real, inverted, and reduced. (Choice B)BThe image formed by Lens 2 is real, upright, and enlarged. (Choice C)CThe image formed by Lens 1 is virtual, inverted, and reduced. (Choice D)DThe image formed by Lens 1 is virtual, upright, and enlarged.
A.
equation of continuity
A1V1=A2V2 holds true when we have laminar flow
Which of the following statements accurately describes the sign conventions used for the thin lens equation? Choose 1 answer:Choose 1 answer: (Choice A)AThe focal length of a lens whose refractive power is positive is negative. (Choice B)BWhile the magnitude of the magnification indicates whether an image is enlarged or reduced, the signage indicates whether it is inverted or upright.(Choice C)CDistances to the right of the lens are negative and on the left are positive. (Choice D)DThe distance of a virtual image is positive since it appears on the same side of the lens.
B.
The resistivity of a solution can be measured by inserting two leads connected to a battery into it, and then measuring the current that passes through the solution. If the shape and separation of the electrodes is unknown, which of the following measurements must be done in order to determine the resistivity of an unknown solution? A. inserting an additional resistor of a known resistance into the circuit, and measuring any changes B. first measuring the resistance of a solution of a known resistivity C. the depth of the electrodes beneath the surface d. determining the material that the electrodes are made from
B. first measuring the resistance of a solution of known resistivity
Problem Which of the following statements accurately describes an image formed by a thin converging lens? Choose 1 answer:Choose 1 answer: (Choice A)AThe image is always real and inverted within the focal length of the lens. (Choice B)BThe image is always larger than the object within the radius of curvature of the lens.(Choice C)CThe image is always smaller than the object outside the focal length of the lens.(Choice D)DThe image is always virtual and upright outside the radius of curvature of the lens.
B. the image is always larger than the object withint he radius of curvature of the lens
Assuming ideal gas properties, which of the following occupies the most volume at 273 K and 1 atm of pressure? Choose 1 answer:Choose 1 answer:(Choice A)AOne mole of hydrogen gas(Choice B, Checked)BThey all occupy the same volume(Choice C)COne mole of oxygen gas(Choice D)DOne mole of nitrogen gas
B. they all occupy the same volume all gasses occupy 22.4 L volume regardless of the identity of the gas
A block of mass m is sitting motionless on a plane with an incline of θ, a coefficient of static friction of μssstart subscript, s, end subscript, and a coefficient of kinetic friction μkkstart subscript, k, end subscript. Which of the following will occur once the plane is elevated on one side, increasing θ? A. the maximum force caused by static friction will increase B. the coefficient of static friction will decrease C. the maximum force caused by static friction will decrease D. the coefficient of kinetic friction will decrease
C.
bernoulli's equation flow rate
V = 1/2R... plug in 1/2R into equation and solve for R
flux
Vi/t
gases found in the environment are most likely to exhibit properties similar to that of ideal gases under conditions f: a. high temperatures and low pressures b. high temperatures and high pressures c. low temperatures and high pressures d. low temperatures and low pressures
a. high temperatures and low pressures
what is the difference between absolute and gauge pressure
absolute pressure is the pressure of a region the pressure difference between a system and its environment is known as the gauge pressure P=P0+Pg
which of the following would be the resistance of an ideal ammeter, which could measure a circuit while affecting it the least? a. the same as the total equivalent resistance of the entire circuit b. 0 c. the same resistance as the battery d. infinity
b. 0 A ammeter is placed in series with the portion of the circuit for which current is to be measured. In order to avoid affecting the flow of electrons through the circuit, the ammeter must itself not obstruct the flow of electrons. Hint #22 / 3The ammeter obstructs the least current when it has minimal resistance due to Ohm's law. Hint #33 / 3The ideal resistance of a perfect ammeter would be 000.
Assume an experiment vessel which is well fitted with a piston. The airtight piston has negligible mass and can move up and down freely. There is 1 mol of an ideal gas contained within the vessel under the piston at pressure of 100 kPa. The piston rests at 10 cm from the base of the vessel. The pressure in the vessel increases to 200 kPa as force is applied to the piston. What would be the new resting position of the piston from the base of the vessel? Assume the temperature is held constant at 300 K throughout the experiment. a. 1 cm b. 5 cm c. 2 cm d. 8 cm
b. 5 cm boyle's law p1v1=p2v2
the behavior of which of these real gases will be reflected most closely with the ideal gas law? a. co2 b. he c. ar d. ch4
b. He large gas molecules generally posses more volume and intermolecular forces and deviate from ideal gas behavior. the smaller the mass, the closer to the ideal gas law
When an object is placed 45 centimeters in front of a diverging lens with a focal length of 15 centimeters, what are the image distance and the magnification? Choose 1 answer:Choose 1 answer: (Choice A)Ad = 22.25 cm and m = -1.0' (Choice B)Bd = -11.25 cm and m = 0.25 (Choice C)Cd = -22.25 cm and m = 0.25 (Choice D)Dd = 10.25 cm and m = 4.1
b. d=-11.25 m =0.25 focal point is negative becasuse it is diverging 1/f =1/di+1/do m=di/do
An unusual alloy has a resistivity of 4×10−84×10−84, times, 10, start superscript, minus, 8, end superscript ohm meters. Suppose that a hollow pipe is made from this alloy that has an inner diameter of 222 meters and an outer diameter of 444 meters. What is the total resistance of a 101010 meter length of this pipe? a. 1x10^-7 ohms b. 9E-9 ohms c 4E-8 ohms d. 9E-7 ohms
c. 4E-8 ohms R=pL/A resistivity(length)/area
after MgCl2 dissolves in a neutrally charged solvent, what is the net charge of the solution? a. the solution becomes negatively charged due to the majority of Cl- ions b. the solution becomes positively charged due to the strong Mg2+ ions c. the solution remains neutrally charged d. the solution becomes positive or negative, depending on the relative Mg2+ and Cl- concentrations
c. the solution remains neutrally charged
The magnitude of the electric force experienced by a point charge aaa distance ddd away from a source charge is affected by which of the following? Choose 1 answer:Choose 1 answer:(Choice A)AThe sign of the point charge. (Choice B)BThe sign of the source charge. (Choice C)CThe value of distance ddd. (Choice D)DThe mass of the source charge.
c. the value of distance d
During an experiment, a thin-lens system in its initial state produces a real, inverted, and enlarged image and in its final state produces a virtual, upright, and enlarged image. Which of the following statements best elucidates on what kind of change occurred for the thin-lens system? a. the object is moved from a point outside the radius of curvature to a point within the focal length of a concave lens b. the converging lens is swapped for a diverging lens to create the switch in orientation c. the object is moved from a point outside the focal length to a point within the focal length of a convex lens d. an additional converging lens was placed outside the focal point of the original lense
c. virtual, upright, and reduced is only produced by a diverging lens
A constant electric field moves a positive point charge from one position to another position so that the change in electric potential is −450 V−450 Vminus, 450, space, start text, V, end text. Which of the following must increase during this movement? Choose 1 answer: a. the charge's potential energy b. the charge's electric potential c. the charge's acceleration d. the charge's velocity
d. the charge's velocity the negative change in electric potential indicates that the point charge moves from a position of higher electrical potential to a position of lower electric potentail
what is the formula of denstiy
d=m/v
is density a scalar or vector
density is a scalar quantity with no direction and is used to describe mass in a continuous system
what factors can affect buoyancy?
density of the fluid, the volume of the fluid displaced, the local acceleration due to gravity
aerodyamic drag
drag increases with density and area and speed and is influenced by other factors including shape, texture, viscosity, and compressibility R = ½ρCAv2
Which of the following would be the resistance an ideal voltmeter, which could measure a circuit while affecting it the least? A. the same resistance as the battery B. 0 c. infinity d. te same as the total equivalent resistance of the entire circuit
infinite A voltmeter is placed in parallel with the portion of the circuit for which potential difference is to be measured. In order to avoid perturbing the circuit, the voltmeter must draw no current. The voltmeter draws minimal current when it has maximal resistance due to Ohm's law. The ideal resistance of a perfect voltmeter would be infinity.
what is buoyancy caused by?
it is caused by differences in pressure acting on opposite sides of an object immersed in a static fluid; buoyant forces act opposite the direction of the frame of reference.. there can be no buoyant force if there is apparent weightlessness
what is stevin's law
pressure in a uniform fluid at a particular depth is directly proportional to density of the fluid, acceleration due to gravity, and depth P=Po+dgh
what is pressure and its formula
pressure is the ratio of force applied per area covered. a scalar quantity with no direction and is a way to describe force in a region of a continuous system P=F/A in pascal
what is buoyancy?
the force exerted on an object that is wholly or partly immersed in a fluid; it is a vector and acts upward
what is terminal velocity
the greatest velocity a falling object reaches
archimedes' principle
the magnitude of the buoyant force of an object is equal to the weight of the fluid it displaces B=dgV
what factors do NOT affect buoyancy?
the mass of the immersed object, the density of the immersed object
what is kinematic viscosity?
the measure of resistive flow of a fluid under the influence of gravity v = nu/d
viscosity
the more area, the more viscous Fv=nA(v/d) F = η ∆vxA∆z ⇔F = m ∆v∆t
what is pascal's principle?
the pressure changes applied to the surface of an enclosed fluid are transmitted evenly throughout the fluid P1=F1/A1=F2/A2=P2
what is reynolds number (re)
the ratio of inertial resistance to viscous resistance for a flowing fluid. Re = inertial resistance/viscous resistance low reynolds numbers eans that the fluid is steady and laminar (n=1) high reynolds numbers means that the fluid is more turbulent and n=2
what is density
the ratio of mass to volume for a material. it is a measure of a material's or object's compactness
what is specific gravity?
the ratio of the density of a substance to the density of a standard substance; unitless
Which of the following statements best describes the image produced by a concave lens? Choose 1 answer:Choose 1 answer: (Choice A)AReal, upright, and reduced image (Choice B)BVirtual, upright, and reduced image (Choice C)CReal, inverted, and enlarged image (Choice D)DVirtual, inverted, and enlarged image
virtual, upright, reduced image
what factors affect viscosity?
viscosity varies w materials. the viscosity of simple liquids decreases with increasing temperature and increases under very high pressures the viscosity of gases increases with increasing temperature and is independent of pressure and density
Which properties reflected in real gases does the van der Waals equation attempt to account for by modifying the ideal gas law? I. VolumeII. PressureIII. Temperature
volume and temperature
laminar flow
Flows in parallel lines in a smooth progression
What is the height of the image of an apple (h = 12 cm) sitting 2 meters away that is projected onto your retina if the focal length of the retina is 20 millimeters? Choose 1 answer :Choose 1 answer: (Choice A)A0.40 cm (Choice B)B1.8 cm (Choice C)C0.12 cm (Choice D)D1.2 cm
Hi=-(Ho*Di)/Do c.
energy density equations
P = F/A = Fs/As= E/V = n
Bernoulli's equation
P1 +1/2 (ρv_1^2)/2+ρgh_1= P_2+1/2 (ρv_2^2)2+ρgh_2 P : absolute pressure of the fluid v: linear speed h: height of the fluid
Sphere AAA and BBB have the same mass and charge magnitudes. They are placed a distance rrr away from each other so that gravitational forces and electrostatic forces allow both spheres to be in equilibrium. What would occur if sphere AAA doubled in charge? Choose 1 answer:Choose 1 answer:(Choice A)ABoth spheres would move away from each other with the same force. (Choice B)BBoth spheres would move towards each other with increasing acceleration. (Choice C)CBoth spheres would move towards each other but sphere BBB will experience a greater force. (Choice D)DBoth spheres would move away from each other but sphere AAA will experience a greater force.
A. both spheres would move away from each other with the same force
Problem Suppose two parallel plates are inserted into a solution, and the current that passes between them for a known potential difference is used to measure the electrolytic resistivity of the solution. How would this resistivity change if the area of both of the two plates was doubled, at a fixed separation distance? Choose 1 answer: A. it would remain the same B. it would double C. it would quadruple D. it would be halved
A. it would remain the same Resistivity is an intrinsic property of a medium, and so it remains the same when the area of the plates is changed
