Given that the acceleration due to gravity on Mars is 3.7 m/s2, what is the gravitational field near Mar's surface?
A. 3.7 N/kg
B. 3.7 N/kg up
C. 3.7 N/kg down
D. 10 N/kg down
Ans: C. 3.7 N/kg down
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If a positively charged object is brought near a suspended, negatively charged object, the suspended object will be
a. repelled. b. charged more. c. discharged. d. attracted.
Which of the following explains why the Moon rises in the east and sets in the west?
A) Earth rotates once each day. B) Earth orbits the Sun once each year. C) The direction of Earth's axis in space precesses with a period of about 26,000 years. D) Stars appear to move randomly relative to our Sun in the local solar neighborhood. E) The universe is expanding.
In principle, if we could see all the way to the cosmological horizon we could see the Big Bang taking place. However, our view is blocked for times prior to about 380,000 years after the Big Bang. Why?
A) Before that time, the universe was too crowded with stars. B) Before that time, the gas in the universe was dense and ionized and therefore did not allow light to travel freely. C) Before that time, the universe was dark so there was no light to illuminate anything. D) 380,000 years after the Big Bang marks the time when stars were first born, and thus began to shine the light by which we can see the universe.
The percentage of 235U, as a fraction of the total uranium content, present in natural uranium is closest to
A) 5 percent. B) 50 percent. C) 1 percent. D) 20 percent. E) 99 percent.