How many particles are there in 1.43 moles of gold?

In a heat of an engine, if 700 j enters the system, and the piston does 400 j of work what is the final internal (thermal) energy of the system if the initial energy is 1,500 j

If a simple machine aduces the strength of a force, what must be increased? the speed of the input force the work the simple machine performs the size of the simple machine the distance over which the force is applied

The half-life of a certain element is 100 days. how many half-lives will it be before only one eighth of this elementremains?