A force of 500 N is required to keep a piano (mass 200 kg) rolling down the hall at a comtant speed a. Find the frictional drag acting on the piano, b. If a total pull of 600N is now applied to the plano, find the rate at which it will accelerate c. We apply this accelerating force until the piano is traveling at a speed of 3.6 m/s. We then let go of the plano and let it coast to a stop. How far will it coast down the hallway before stopping? d. Find the coefficient of friction between the piano's rollers and the floor of the hallway I am sorry but please show work.

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?

Select all the correct answers. which three statements about electromagnetic radiation are true?

Use the illustration to describe how the electromagnetic spectrum changes as its frequency moves from radio waves to higher energy gamma waves in terms of wavelength and amplitude.