Show your work: Find the gravitational force between a lead sphere with a mass of 5.0kg and another with a mass of 0.3 kg when they are placed 2.0mm apart? (Watch your units!)

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?