Pumped storage facilities ________.
a. increase the overall efficiency of a power plant
b. make use of the output of electricity from photovoltaic cells
c. are used to produce electricity mainly at night
d. have an increase in their potential energy mainly at night
e. cannot be used with a nuclear plant
Question 2
A projectile is thrown from the top of a building with an initial velocity of 30 m/s in the horizontal direction. If the top of the building is 30 m above the ground, how fast will the projectile be moving just before it strikes the ground?
a. 35 m/s
b. 39 m/s
c. 31 m/s
d. 43 m/s
e. 54 m/s
