Chapter 10 ReviewHow much work is done when a crate is pulled at a 15o angle to the horizontal for 15 m with a force of 45 N?

A 3100 Kg car starting from rest is pushed with a constant force of 5500 N in the forward directions and an opposing force of 4000 N. How far does the car need to travel to obtain a speed of 0.75 m/s ?

What is the potential energy of a 12.3 Kg box setting 4.2 m above the floor?

A pulley system has 4 support ropes uses 831 N to lift a box with a weight of 2550N. What is the efficiency of this pulley system?

A 800 N crate is pushed horizontally with a force of 152 N for a distance of 23 m. If the coefficient of kinetic energy to be 0.31, what is the net work done on the crate.

A man exerts a force of 183 N on a lever to move a 688 N box a distance of 3.3m. If the efficiency of the lever is 92.8 %, how far did the man move the resistance arm of this lever?

A 2800 Kg car accelerates from rest to 17.5 m/s in 2.9 s. How much work is done?

A 15 Kg bowling ball travels at a constant 7.5 m/s, how much kinetic energy does the ball have?

How fast will a 15 Kg ball travel to have a kinetic energy of 68 J ?

A ramp system that is 5 m long and 2.5 m high is used to move a 48 Kg box. A worker used 399 N of force to move the box the 5 m up the ramp. What is the efficiency of this incline plane?

A 148 Kg box is to be raised 2.8 m at a constant speed. It takes 1.75 s to raise the box. How many kW of power is used to rise the box?

A 12 Kg ball is at the top of a ramp set 6 m above the ground. What is the speed of the ball at the bottom of the ramp? No zero friction.

A machine has a motor rated at 68kW. How long will it take for this motor to do 7.8 x 104 kJ of work? Express your answer in seconds.