Questions from Modern Physics

Q: Consider the system shown in Fig. E5.34. Block

Consider the system shown in Fig. E5.34. Block A weighs 45.0 N, and block B weighs 25.0 N. Once block B is set into downward motion, it descends at a constant speed. (a) Calculate the coefficient of k...

Q: (a) If the coefficient of kinetic friction between tires and

(a) If the coefficient of kinetic friction between tires and dry pavement is 0.80, what is the shortest distance in which you can stop a car by locking the brakes when the car is traveling at 28.7 m/s...

Q: A 25.0-kg box of textbooks rests on a

A 25.0-kg box of textbooks rests on a loading ramp that makes an angle a with the horizontal. The coefficient of kinetic friction is 0.25, and the coefficient of static friction is 0.35. (a) As a is i...

Q: Two crates connected by a rope lie on a horizontal surface (

Two crates connected by a rope lie on a horizontal surface (Fig. E5.37). Crate A has mass mA, and crate B has mass mB. The coefficient of kinetic friction between each crate and the surface is mk. The...

Q: You have two identical tennis balls and fill one with water.

You have two identical tennis balls and fill one with water. You release both balls simultaneously from the top of a tall building. If air resistance is negligible, which ball will strike the ground f...

Q: A box with mass m is dragged across a level floor with

A box with mass m is dragged across a level floor with coefficient of kinetic friction mk by a rope that is pulled upward at an angle u above the horizontal with a force of magnitude F. (a) In terms o...

Q: As shown in Fig. E5.34, block A (

As shown in Fig. E5.34, block A (mass 2.25 kg) rests on a tabletop. It is connected by a horizontal cord passing over a light, frictionless pulley to a hanging block B (mass 1.30 kg). The coefficient...

Q: You throw a baseball straight upward. The drag force is proportional

You throw a baseball straight upward. The drag force is proportional to v2. In terms of g, what is the y-component of the ball’s acceleration when the ball’s speed is half its terminal speed and (a) i...

Q: A large crate with mass m rests on a horizontal floor.

A large crate with mass m rests on a horizontal floor. The coefficients of friction between the crate and the floor are

Q: (a) In Example 5.18 (Section 5.

(a) In Example 5.18 (Section 5.3), what value of D is required to make vt = 42 m/s for the skydiver? (b) If the skydiver’s daughter, whose mass is 45 kg, is falling through the air and has the same D...