A motor has an efficiency of 0.2. How much useful energy is produced from 150 j? A. 20
B. 750
C.0.2
D. 0.75

How much work would be needed to raise the payload from the surface of the moon (i.e., x = r) to an altitude of 5r miles above the surface of the moon (i.e., x = 6r)?

Which of the following are not typically included in the periodic table? a. atomic mass b. element symbol c. isotopes d. number of electrons

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain