Arod steel of 100cm increase by 0.11cm when it's temperature rises by 900c . calculate the coefficient of the liner expansion of steel

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

1kg of water needs to recieve 4200j of energy to go from 90 degrees to 91 degrees. what is the specific heat capacity of water? what are the units?

Aturntable that spins at a constant 74.0 rpm takes 3.10 s to reach this angular speed after it is turned on. find its angular acceleration (in rad/s2), assuming it to be constant, and the number of degrees it turns through while speeding up.