2011 AP Physics C物理C—Mechanics力学真题系列之简答题免费下载

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2011 AP Physics C Mechanics Free-Response Questions Free Download

2011 AP 物理C力学简答题部分免费下载

此套题仅 p II含有简答题，

共计时45分钟，共3题

占总分50%

每道大题可能含有不同数量的小题

可以使用计算器

部分真题预览：

1）A projectile is fired horizontally from a launching device, exiting with a speed v_x . While the projectile is in the launching device, the impulse imparted to it is J_p , and the average force on it is F_avg . Assume the force becomes zero just as the projectile reaches the end of the launching device. Express your answers to parts (a) and (b) in terms of v_x , J_p , F_avg , and fundamental constants, as appropriate.

1. Determine an expression for the time required for the projectile to travel the length of the launching device.
2. Determine an expression for the mass of the projectile.
   The projectile is fired horizontally into a block of wood that is clamped to a tabletop so that it cannot move. The projectile travels a distance d into the block before it stops. Express all algebraic answers to the following in terms of d and the given quantities previously indicated, as appropriate.
3. Derive an expression for the work done in stopping the projectile.
4. Derive an expression for the average force F_b exerted on the projectile as it comes to rest in the block.
   Now a new projectile and block are used, identical to the first ones, but the block is not clamped to the table. The projectile is again fired into the block of wood and travels a new distance d_n into the block while the block slides across the table a short distance D. Assume the following: the projectile enters the block with speed v_x , the average force F_b between the projectile and the block has the same value as determined in part (d), the average force of friction between the table and the block is f_T , and the collision is instantaneous so the frictional force is negligible during the collision.
5. Derive an expression for d_n in terms of d, D, f_T , and F_b , as appropriate.
6. Derive an expression for d_n in terms of d, the mass m of the projectile, and the mass M of the block.

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