Barney and Fred are moving again. They slide large crates down the ramp from the truck to the ground. Tocontrol a crate and keep it sliding at a constant speed, Barney backs down the ramp in front of the cratewhile pushing upward on it. During its trip to the bottom, is the thermal energy created in the ramp and thecrate greater than, less than, or equal to the crate’s loss of gravitational potential energy? Explain.

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?

What is the temperature in degrees celsius of a substance with a tempature of 49k

Awater balloon launcher uses an elastic band with a spring constant of 115 n/m to use thee launcher you stretch thee band back with a balloon n it the water balloons have a mass of 1.3 kg a) if you stretch the band by 0.8 m, what elastic force will the band exert? b) with the band stretched 0.8 m, how much elastic potential energy is stored in the spring? c) if you release the band, it pushes forward. what is the kinetic energy of the balloon when it reaches the natural length of the band? d) what is the speed of the balloon when it reaches the natural length of the band?