A cable that weighs 2 kg per meter is used to lift 400 kg of coal up a mineshaft 100 meters deep. However, when it reaches a height of 50 meters, it knocks against the wall and loses 20 kg of coal. How much work is required to lift it all the way from the bottom to the top

Explain using examples, what is simple harmonic motion and why it is an important area of study in physics.

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer

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?