What term is used to describe a force of attraction between objects that is due to their masses?

Could someone me find the answer to this problem.

The heliocentric and the geocentric models of the solar system included these central principles

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.