Q1. A person is pulled to the right on a sled (total mass of 54.3 kg) across the surface of a frozen pond with a force of 86.6 Newton's so that they move with a constant velocity. What is the force of friction acting on sled?
Q2. A)Supposing that it remains at that value all the way to absolute zero, calculate the number of calories it would take to change a 0.50g ice cube at absolute zero (-273 degree C}) to 0.50 g of boiling water.
B)How does this number of calories compare with the number of calories required to vary the same gram of 100 degree C boiling water to 100 degree C steam?