Q. A 56.6 kg box initially at rest is pushed 3.26 m along a rough, horizontal ?oor with a constant applied horizontal force of 86.3631 N. If the coefficient of friction between box and ?oor is 0.131, ?nd the work done by the friction. The acceleration of gravity is 9.8 m/s 2 . Answer in units of J.
Q. What mass (in grams) of steam at 100°C must be mixed with 212 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 14.0°C? The specific heat of water is 4186 J/kg·K. The latent heat of fusion is 333 kJ/kg, and the latent heat of vaporization is 2256 kJ/kg