2017年AP物理2（选择题+简答题）真题及答案高清无水印PDF下载

2017年AP物理2（选择题+简答题）真题及答案高清无水印PDF下载

2017年AP物理2选择题真题如下：

1. The graph above describes the location of an electron in a hydrogen atom that is in the ground state. What conclusion can be drawn from the graph?

(A) The distance of the electron from the nucleus is exactly equal to one Bohr radius.

(B) The electron will probably slide down either the left slope or the right slope, depending on its initial location.

(C) The electron must always be located within three Bohr radii of the nucleus.

(D) The greatest probability of locating the electron is at a distance of one Bohr radius from the nucleus.

2. The graphs above show the electric field as a function of position at some instant of time for four different electromagnetic plane waves. Which of the following correctly ranks the frequency f of the waves?

A f1 > f2 > f3 > f4

B f1 > f3 > f4 > f2

C f2 > f4 > f3 > f1

D f4 > f3 > f2 > f1

3. When two bowling balls are held with their centers 30 centimeters apart, they exert a gravitational force of magnitude F on each other. For two free protons to exert a net force of magnitude F on each other, the protons must be separated by a distance of approximately 1×10^-10m. Under these conditions, will the protons attract or repel each other, and why?

(A) They will attract each other, because they both have positive charge.

(B) They will attract each other, because the gravitational force is always attractive.

(C) They will repel each other, because the repulsive electrical force between the protons is much stronger than the attractive gravitational force.

(D) They will repel each other, because the protons only exert a repulsive electrical force on each other and do not exert an attractive gravitational force.

4. The energy level diagram for a hypothetical atom is shown in the figure above. Which of the labeled transitions in the diagram would produce a photon with the shortest wavelength?

(A) A

(B) B

(C) C

(D) D

5. The figure above shows a small compass C that is equidistant from the poles of two identical bar magnets. Which of the following best represents the direction that the needle of the compass will point?

2017年AP物理2选择题真题余下省略！

2017年AP物理2简答题真题：

1. (10 points, suggested time 20 minutes)

A team of engineering students is testing their newly designed 200kg raft in the pool where the diving team practices. The raft must hold a 730 kg steel cube with edges of length 45.0 cm without sinking. Assume the density of water in the pool is 1000 kg/m³ .

(a) The students use a crane to gently place the cube on the raft but accidentally place it off center. The cube remains on the raft for a few moments and then the raft tilts, causing the cube to slide off and sink to the bottom of the pool. The raft remains floating in the pool. In a coherent paragraph-length response, indicate whether the water level in the pool when the cube is on the bottom of the pool is higher than, lower than, or the same as when the cube is on the raft, and explain your reasoning. For both cases, assume that there is no motion of the water.

(b) The bottom of the pool is 5 m below the surface of the water. The crane is now used to lift the cube out of the pool. The cube is lifted upward at a slow and constant speed, so all drag forces are negligible.

i. Predict how the force exerted by the crane on the cube when the bottom of the cube is at a depth of 2.0 m compares to the force exerted by the crane on the cube when the bottom of the cube is at a depth of 4.0 m. Explain your reasoning.

ii. On the black square below, which represents the cube, draw and label the forces (not components) that are exerted on the cube while the crane is lifting it and the bottom of the cube is 4 m below the surface of the water. Each force must be represented by a distinct arrow starting on, and pointing away from,the black square. The lengths of the arrows should approximately demonstrate the net force on the cube.

iii. Calculate the force exerted by the crane on the cube when the bottom of the cube is 4 m below the surface of the water.

2. (12 points, suggested time 25 minutes)

A student gives the following description of a thermodynamic cycle through which a sample of an ideal monatomic gas is taken.

“Initially, the gas has a volume of 1×10^-3 m³ and a pressure of 1×10⁵ Pa . The gas is in a closed cylinder that has a movable piston on one end. Call the initial state of the gas state A. Process AB takes the gas at constant pressure from state A to state B, where B has three times the volume of state A. The gas is then compressed isothermally until it is back to its initial volume, reaching state C. Finally, a single process CA returns the gas to its initial state A.”

(a) i. On the axes below, plot states A, B, and C, and sketch a graph of pressure P as a function of volume V for cycle ABCA. Label states A, B, and C, and label the axes with numerical values.

ii. Let the temperature for state A be T₀ . In terms of T₀ , determine the temperature for state B.

iii. Compare the temperature at state C to the temperature at state A. Explain how your comparison is consistent with your graph above.

(b)

i. Briefly describe an experimental procedure that would take the gas from state C to state A.

ii. Relate the temperature of the gas to the microscopic processes involved in the energy transfer as the gas goes from state C to state A for the procedure you described in part (b)(i).

(c)

i. Use the student’s verbal description or your graph in part (a)(i) to calculate a numerical value for the work done on the gas in process AB.

ii. The magnitude of the change in internal energy for process AB is |△U|=300J. Calculate a numerical value for the energy added to or removed from the gas by heating in process AB.

2017年AP物理2简答题真题余下省略！

2017年AP物理2（选择题+简答题）真题及答案高清无水印PDF下载，20元有偿！