2020-10-20 来源:ap.socool100.com
2016年AP力学(选择题+简答题)真题及答案下载(PDF)
以下为2016年AP力学选择题真题:
1. A projectile is launched with a speed of 40 m s at an angle of 30° above the horizontal, as shown in the figure above. The projectile lands on a plateau 3 s later. The height △y of the plateau is most nearly
(A) 15 m
(B) 30 m
(C) 45 m
(D) 60 m
(E) 75 m
2. A small sphere hangs from a string attached to the ceiling of a uniformly accelerating train car. It is observed that the string makes an angle of 37°with respect to the vertical. The magnitude of the acceleration a of the train car is most nearly
(A) 6.0 m / s2
(B) 7.5 m / s2
(C) 8.0 m / s2
(D) 10 m / s2
(E) 13 m / s2
3. Which of the following statements must be true for a falling object that has been dropped from rest near the surface of Earth?
(A) The derivative of the distance the object falls with respect to time equals 9.8 m /s2 .
(B) The object falls a vertical distance of 9.8 m during the first second only.
(C) The object falls a vertical distance of 9.8 m during each second.
(D) The speed of the object as it falls is a constant 9.8 m /s .
(E) The speed of the object increases by 9.8 m /s during each second.
4. The position x as a function of time t for an object moving in a straight line is shown in the graph above. Which of the following best describes the object’s speed and direction of motion during the time interval shown?
Speed Direction of Motion
(A) Decreasing Positive
(B) Increasing Positive
(C) Constant Positive
(D) Decreasing Negative
(E) Increasing Negative
5. The force F exerted on a ball during a collision with a wall is given as a function of time t by the equation F(t)=αt-βt2 , where α=400 N/s and β=4000 N/s2 . The ball first contacts the wall at t = 0, and the collision lasts for 0.10 s.What is the magnitude of the change in momentum of the ball?
(A) 0
(B) 0.67 kg•m/s
(C) 3.33 kg•m s
(D) 3.60 kg•m s
(E) The change in momentum of the ball cannot be determined without knowing the mass of the ball.
余下2016年AP力学选择题真题省略!
以下为2016年AP力学简答题真题:
Mech.1.
A block of mass mB is being pulled up a ramp by a hanging object of mass mH , as shown in the figure above. The blocks are attached to each other by a light string that passes over a pulley of negligible mass and friction. Both the block and the hanging object are moving at constant speed, and the angle of the ramp with the horizontal is θ . The coefficient of kinetic friction between the block and the ramp is μk .
(a) On the dots below, which represent the block and the hanging object, draw and label the forces (not components) that act on the block and the hanging object. Each force must be represented by a distinct arrow starting on, and pointing away from, the appropriate dot.
(b) Derive an expression for the mass mH of the hanging object. Express your answer in terms of mB , θ , μk , and physical constants, as appropriate. If you need to draw anything other than what you have shown in part (a) to assist in your solution, use the space below. Do NOT add anything to the figure in part (a).
It is determined that mB = 2.0 kg,θ=30°, and μk= 0.10. While the block is moving up the ramp and the hanging object is moving downward, the string is suddenly cut.
(c)
i. Calculate the magnitude of the acceleration of the block immediately after the string is cut.
ii. What is the direction of the acceleration of the block immediately after the string is cut?
____ Up the ramp _____ Down the ramp
____ No direction, because the acceleration is zero
iii. Determine the magnitude of the acceleration of the hanging object immediately after the string is cut.
(d) Assume the block is moving up the ramp at 2.0 m /s when the string is cut. Calculate how far the block travels up the ramp from the time the string is cut until the block stops, assuming there is sufficient distance on the ramp.
余下2016年AP力学简答题真题省略!
2016年AP力学(选择题+简答题)真题及答案下载(PDF),完整版下载,20元有偿!
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