Which of the following explains why the Sun appears to move gradually eastward along the path called the ecliptic on the celestial sphere?
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.
D) Stars appear to move randomly relative to our Sun in the local solar neighborhood.
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A steel lift column in a service station is a solid cylinder 4.0 m long and 0.20 m in diameter. Young's modulus for this steel is 20 × 1010 N/m2. By what distance does the column compress when a 5000-kg truck is on it?
A) 4.7 × 10-7 m B) 8.0 × 10-7 m C) 3.2 × 10-6 m D) 7.8 × 10-6 m E) 3.1 × 10-5 m
When a constant and sustained upward force acts on a rocket, its acceleration increases mainly because
A) gravity becomes weaker with increased distance. B) the mass of the rocket decreases as fuel is burned. C) No way, for acceleration would be constant.
When a hot object makes thermal contact with a cold object, the direction of
A) temperature is from hot to cold. B) internal energy flow is from hot to cold C) both of these D) neither of these
Based on our current knowledge of the motions of Uranus and Neptune, it is obvious that Pluto's discovery was a triumph of physics, on par with Adams and Leverrier's work in finding Neptune
Indicate whether the statement is true or false