Dave pushes a shopping cart with a constant force of 10.0 Newton’s across the floor of a grocery store. The frictional force exerted by the floor is 4.0 Newtons, and the acceleration of the cart is 1.0 meters/second^2. What is the mass of the shopping cart?

If 21.2 kcals of energy is released by this reaction, how many kj does the reaction release? (1 cal 4.184 j)

An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg.how much energy e must be supplied to the device? express your answer in joules.

Why does some plastic stick to your skin?