A satellite is held in orbit by a 1 000-N gravitational force. Each time the satellite completes an orbit of circumference 80 000 km, the work done on it by gravity is:
a. 1.0×108 J.
b. 8.0×108 J.
c. 1.0×1011 J.
d. 0.
e. 8.0×1011 J.
d
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Indicate whether the statement is true or false
In the simplified Drake equation, the total number of life-bearing planets in our galaxy is given by
A) NHP B) flife C) NHP × flife D) NHP / flife
You slam on the brakes of your car in a panic, and skid a certain distance on a straight level road. If you had been traveling twice as fast, what distance would the car have skidded, under the same conditions?
A) It would have skidded twice as far. B) It would have skidded one half as far. C) It would have skidded 4 times farther. D) It would have skidded 1.4 times farther. E) It is impossible to tell from the information given.
A long wire carries a current toward the north in a magnetic field that is directed vertically downward. What is the direction of the magnetic force on the wire?
a) west b) north c) east d) vertically upward e) vertically downward