Questions from Modern Physics

Q: You are called as an expert witness in a trial for a

You are called as an expert witness in a trial for a traffic violation. The facts are these: A driver slammed on his brakes and came to a stop with constant acceleration. Measurements of his tires and...

Q: Block A in Fig. P5.87 weighs 1.90

Block A in Fig. P5.87 weighs 1.90 N, and block B weighs 4.20 N. The coefficient of kinetic friction between all surfaces is 0.30. Find the magnitude of the horizontal force F S necessary to drag block...

Q: A 12.0-kg box rests on the level bed

A 12.0-kg box rests on the level bed of a truck. The coefficients of friction between the box and bed are

Q: For the cases shown in Fig. Q6.8, the

For the cases shown in Fig. Q6.8, the object is released from rest at the top and feels no friction or air resistance. In which (if any) cases will the mass have (i) the greatest speed at the bottom a...

Q: Block A in Fig. P5.89 has mass 4.

Block A in Fig. P5.89 has mass 4.00 kg, and block B has mass 12.0 kg. The coefficient of kinetic friction between block B and the horizontal surface is 0.25. (a) What is the mass of block C if block B...

Q: Two blocks connected by a cord passing over a small, frictionless

Two blocks connected by a cord passing over a small, frictionless pulley rest on frictionless planes (Fig. P5.90). (a) Which way will the system move when the blocks are released from rest? (b) What i...

Q: In terms of m1, m2, and g, find the

In terms of m1, m2, and g, find the acceleration of each block in Fig. P5.91. There is no friction anywhere in the system. Fig. P5.91:

Q: Block B, with mass 5.00 kg, rests on

Block B, with mass 5.00 kg, rests on block A, with mass 8.00 kg, which in turn is on a horizontal tabletop (Fig. P5.92). There is no friction between block A and the tabletop, but the coefficient of s...

Q: Two objects, with masses 5.00 kg and 2.

Two objects, with masses 5.00 kg and 2.00 kg, hang 0.600 m above the floor from the ends of a cord that is 6.00 m long and passes over a frictionless pulley. Both objects start from rest. Find the max...

Q: You are riding in an elevator on the way to the 18th

You are riding in an elevator on the way to the 18th floor of your dormitory. The elevator is accelerating upward with a = 1.90 m/s2. Beside you is the box containing your new computer; the box and it...