Calculate the mass of the earth from the period of the moon (27.3 d) and its mean orbital radius of 3.84 × 108 m. The universal gravitational constant is 6.673 × 10−11 N · m2 /kg2 .

The sun generates both mechanical and electromagnetic waves. which statement about those wave is true?

Why can blue light and yellow light combine to produce white light? question 17 options: they are both primary colors of light. they absorb each other's wavelengths. because blue, yellow, and white are primary colors. they are complementary colors of light.

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