Planet X has 4 times the mass of Earth but the same radius. What is the strength of the gravitational field on its surface?
(1) 4g
(2) 16g
(3) 1/4g
(4) 1/16g

Which statement correctly describes a step-up transformer? a. it increases the amount of electric energy available. b. it increases the voltage of an electric current. c. it changes direct current into alternating current. d. it has more loops of wire in its primary coil.

What is the energy of a photon of ultraviolet radiation with a frequency of 4.4 × 1015 hz? planck’s constant is 6.63 × 10–34

What is the measurement of how fast an object moves relative to a reference point?