Question

A 30.0-kg crate is pushed across a rough floor by a horizontal force of 100 N of kinetic fiction between the crate and the floor is 0.100. If a total of 80.5 1 of work the crate, how far was it moved along the floor? done 21. Find the magnitude of the force ating on a 3.0-kg (assume all units in MKSo-ms cated at -2.0 m inside a potential 22. Which one of the following statements is false? More power is required to lift a box slowly than to lift a box quickly b. a. Work cannot be done in the absence of motion. c. A force is required to do work 23. A 0.051 kg softball was bounced on the sidewalk. The velocity change of the ball is from 26 m/s downward to 18 m/s upward. If the contact time with the sidewalk is 00 s, what is the magnitude of the average force exerted on the ball by the sidewalk? 24. The center of the baseball of radius of 5.7 cm moves at 44.0 m/s. The ball spins about an axis through its center of mass with an angular speed of 170 rad/s. Calculate the ratio of the rotational energy to the translational kinetic energy. Treat the ball as a uniform sphere. 25. Find the magnitude of the torque produced by a 4.8 N force applied to a door at a perpendicular distance of 0.40 m from the hinge.

Answer 1