a block weighing 15.0N is resting on a flat surface and a horizontal force of 3.0N is acting on it. calculate the frictional force​

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.

What is the freezing point of radiator fluid that is 50% antifreeze by mass? kf for water is 1.86 ∘c/m.