Imagine that a certain engine can cause the road to exert a certain maximum forward force on a certain car. If we change the car’s design to reduce its drag coefficient by a factor of 2, by what factor will the car’s maximum speed increase (other things being equal)?
A. No increase
B. 1.41
C. 2
D. 4
E. Depends (specify)
F. Other (specify)
B. 1.41
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The sky is blue because
A) molecules scatter blue light more effectively than red light. B) molecules scatter red light more effectively than blue light. C) the Sun mainly emits blue light. D) the atmosphere transmits mostly blue light. E) the atmosphere absorbs mostly blue light.
The fact that the cosmic microwave background radiation has almost exactly the same temperature in every direction is referred to as the _______________ problem
Fill in the blank(s) with correct word
Suppose that the speed of an electron traveling 1.0 km/s is known to an accuracy of 1 part in 10,000 (that is, within 0.01%)
What is the minimum uncertainty in the position of this electron? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
An observer on Earth's equator would find _______
a. the celestial equator passing at 45 degrees above the northern horizon. b. the celestial equator passing at 45 degrees above the southern horizon. c. that the celestial equator coincides with the horizon. d. the celestial equator passing directly overhead. e. None of the other choices are true.