Galileo's observation of the satellites of Jupiter showed that ________.
A. the Moon was not a flawless sphere
B. nothing orbited Earth
C. there were objects that did not orbit Earth
D. planets orbited the Sun
E. None of these choices is correct.
Answer: C
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Earth's radius at the equator is larger than that at the poles. Where is Earth's surface gravity more?
A. at the equator B. at the top of Mount Everest C. at the North and South Poles D. It is the same everywhere.
An AC series circuit has 18.9-? resistance, 21.1-? inductive reactance, and 15.5-? capacitive reactance. If an effective (rms) emf of 94 V is applied, what is the power output?
a. 2.34E+2 W b. 1.60E+2 W c. 4.66E+2 W d. 4.30E+2 W e. 2.32E+2 W
An airplane travels 80 m/s as it makes a horizontal circular turn which has a 0.80-km radius. What is the magnitude of the resultant force on the 75-kg pilot of this airplane?
a. 0.69 kN b. 0.63 kN c. 0.66 kN d. 0.60 kN e. 0.57 kN
A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the car
A) The force of collision on the truck is greater then the force of collision on the car. B) The force of collision on the truck is equal to the force of collision on the car. C) The force of collision on the truck is smaller than the of collision force on the car. D) The truck did not slow down during the collision. E) The car did not slow down during the collision.