A satellite is held in orbit by a 3000-N gravitational force. Each time the satellite completes an orbit of circumference 80,000 km, the work done on it by gravity is:
a. 2.4 × 10^8 J
b. 2.4 × 10^11 J
c. 9.6 × 10^11 J
d. 0
D
You might also like to view...
A mass of 4.5 kg, resting on a horizontal frictionless surface, is attached on the right to a horizontal spring with spring constant 29 N/m and on the left to a horizontal spring with spring constant 60 N/m. If this system is moved from equilibrium, what is the effective spring constant?
a. –31 N/m b. 31 N/m c. 89 N/m d. –89 N/m e. 16 N/m
Light-gathering power is proportional to the _______________ of the telescope primary lens or mirror
Fill in the blank(s) with correct word
Which of the following statements is true?
A) In a p-type doped semiconductor the donor level is close to the valence band. B) In an n-type doped semiconductor the acceptor level is close to the valence band. C) In a p-type doped semiconductor the acceptor level is close to the valence band. D) In an n-type doped semiconductor the donor level is close to the valence band. E) None of the statements are true.
A pair of tennis balls fall through the air from a tall building. One ball is regular and the other is filled with lead pellets. Air resistance just before they hit is greater for the
A) regular ball. B) lead-filled ball. C) same for both