The car's mass is 400 kg. It moves at a velocity of 20 m/s. Calculate the car's momentum. A.
8000 kg*m/s
B.
20 kg*m/s
C.
0.05 kg*m/s
D.
80,000 kg*m/s

What produces light and all other electromagnetic waves? a) the photoelectric phenomena b) heated metals c) charged particles d) radioactive samples (pls explain if you can : )

Which of the following elements is in the same period as phosphorus? a. carbon c. nitrogen b. magnesium d. oxygen select the best answer from the choices provided a b c d

How are the crust and the inner core alike? a) they are both solid. b) they both have the same temperature. c) they are both under the same pressure. d) they are both very close to the center of the earth.