2020-10-20 来源:ap.socool100.com
2017年AP力学(选择题+简答题)真题及答案下载(PDF)
以下为2017年AP力学选择题真题:
1. A plane starts at rest on a straight runway. For the first 30 s, the plane’s acceleration a is given as a function of time t by the equation a =βt2 , where β = 1/90 m/s4 and t is in seconds.What is the plane’s speed at t = 30 s ?
(A) 10 m / s
(B)30 m / s
(C)100 m / s
(D)150 m / s
(E)300 m / s
2. Student 1 is standing on a cart holding a small stone, while student 2 is standing at rest on the ground, as shown in the figure above. The cart is moving at a constant speed v in the +x-direction, as indicated by the coordinate system shown. Student 1 drops the stone precisely when passing student 2. Which of the following best represents the path of the falling stone relative to student 1 and the path of the falling stone relative to student 2 ?
3. A particle of mass 2.0 kg is moving in the xy-plane at a constant speed of 0.80 m/s in the +x-direction along the line y = 4 m. As the particle travels from x = -3 m to x = +3 m, the magnitude of its angular momentum with respect to the origin is
(A) not constant
(B) 0
(C) 4.8 kg•m2/s
(D) 6.4 kg•m2/s
(E) 8.0 kg•m2/s
4. Suppose that a spherical star spinning at an initial angular velocity w suddenly collapses to half of its original radius without any loss of mass. Assume the star has uniform density before and after the collapse. What will the angular velocity of the star be after the collapse?
A ω/4
B ω/2
C ω
D 2ω
E 4ω
5. Two identical, unlabeled boxes are transported to an orbiting space station. The astronauts know that one box is filled with a light sample of ants for an experiment, and the other is filled with heavy tools for repairs. How can the astronauts tell, without opening the boxes, which box has the tools?
(A) Weigh each box on a spring scale. The box with the tools will have a higher reading.
(B) Shake each box. The box with the tools will be harder to move back and forth.
(C) Push each box. The box with the tools will travel farther before it stops.
(D) Place each box on opposite sides of a balance. The box on the side that goes down lower will be the box with the tools.
(E) Toss each box straight up. The box with the tools will go higher before coming back down.
余下2017年AP力学选择题真题及答案省略!
2017年AP力学简答题真题:
1. A spring of negligible mass and with a spring constant of 50 N/m is hung vertically, as shown above in the figure on the left. A block of mass 1.0 kg is attached to the spring and slowly lowered a distance x0 until it hangs at rest at the equilibrium position, as shown above in the figure on the right.
(a) On the dot below that represents the block, draw and label the forces (not components) that act on the block when it is at the equilibrium position shown. Each force must be represented by a distinct arrow starting on,and pointing away from, the dot.
(b) Calculate the distance x0 that the spring is stretched from its original length to the equilibrium position.
While the 1.0 kg block is in equilibrium, a 0.20 kg ball of clay is launched with speed v0 vertically from the ground 1.0 meter below the hanging block. The clay has speed v1 = 5.0 m/s when it collides with the block.
(c) Calculate the speed v0 .
Upon impact, the clay sticks to the 1.0 kg block.
(d)
i. Calculate the speed of the block immediately after the collision.
ii. Calculate the kinetic energy lost in the collision.
iii. Determine the period of oscillation for the block-clay-spring system.
(e) When the oscillating block-clay-spring system reaches its maximum speed after the collision, will the spring be stretched from its original length by a distance greater than, less than, or equal to x0 ?
____ Greater than ____ Less than ____ Equal to
Justify your answer.
(f) The collision is repeated using a rubber ball with the same mass as the ball of clay. The rubber ball is launched vertically with the same speed v0 . The collision between the rubber ball and the block is elastic.Will the speed of the block immediately after colliding with the rubber ball be greater than, less than, or equal to the speed of the block you calculated in part (d)i ?
____ Greater than ____ Less than ____ Equal to
Justify your answer.
2017年AP力学简答题真题及答案解析,余下省略!
2017年AP力学(选择题+简答题)真题及答案下载(PDF),完整版,20元有偿下载
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