Questions from Modern Physics

Q: A block with mass m1 is placed on an inclined plane with

A block with mass m1 is placed on an inclined plane with slope angle a and is connected to a hanging block with mass m2 by a cord passing over a small, frictionless pulley (Fig. P5.74). The coefficien...

Q: High-speed motion pictures (3500 frames/second) of

High-speed motion pictures (3500 frames/second) of a jumping 210-

Q: In Example 5.5 (Section 5.1), how

In Example 5.5 (Section 5.1), how does the work done on the bucket by the tension in the cable compare with the work done on the cart by the tension in the cable? Example 5.5: Your firm needs to hau...

Q: Block A in Fig. P5.79 weighs 1.20

Block A in Fig. P5.79 weighs 1.20 N, and block B weighs 3.60 N. The coefficient of kinetic friction between all surfaces is 0.300. Find the magnitude of the horizontal force F S necessary to drag bloc...

Q: You are designing an elevator for a hospital. The force exerted

You are designing an elevator for a hospital. The force exerted on a passenger by the floor of the elevator is not to exceed 1.60 times the passenger’s weight. The elevator accelerates upward with con...

Q: You are standing on a bathroom scale in an elevator in a

You are standing on a bathroom scale in an elevator in a tall building. Your mass is 64 kg. The elevator starts from rest and travels upward with a speed that varies with time according to v(t)=(3.0 m...

Q: A hammer is hanging by a light rope from the ceiling of

A hammer is hanging by a light rope from the ceiling of a bus. The ceiling is parallel to the roadway. The bus is traveling in a straight line on a horizontal street. You observe that the hammer hangs...

Q: A 40.0-kg packing case is initially at rest

A 40.0-kg packing case is initially at rest on the floor of a 1500-kg pickup truck. The coefficient of static friction between the case and the truck floor is 0.30, and the coefficient of kinetic fric...

Q: If the coefficient of static friction between a table and a uniform

If the coefficient of static friction between a table and a uniform, massive rope is

Q: Two identical 15.0-kg balls, each 25.

Two identical 15.0-kg balls, each 25.0 cm in diameter, are suspended by two 35.0-cm wires (Fig. P5.85). The entire apparatus is supported by a single 18.0-cm wire, and the surfaces of the balls are pe...