What causes the seasons?
A. the elliptical shape of Earth's equator
B. the changing distance between Earth and the Sun
C. Earth's spin axis is tilted from the poles of the celestial sphere
D. the tilt of Earth's spin axis relative to Earth's orbit
Answer: D
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An astronaut on a spaceship moving at 0.927c says that the trip between two stationary stars took How long does this journey take as measured by someone at rest relative to the two stars?
A) 20.0 y B) 2.81 y C) 4.05 y D) 22.1 y
The seasonal changes on Mars create:
A) remarkable changes in size of the two dry ice polar caps. B) changes in the dark features noted from Earth by telescopes long ago. C) huge dust storms that can enshroud the planet's disk. D) great changes in the barometric pressure as the atmosphere freezes and sublimes. E) All of these are correct.
Suppose a ball is thrown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is going up
A) Both its velocity and its acceleration point upward. B) Its velocity points upward and its acceleration points downward. C) Its velocity points downward and its acceleration points upward. D) Both its velocity and its acceleration points downward. E) Neither velocity nor acceleration can be determined without additional information.
As a pressurized aircraft gains altitude, the difference between the outside air pressure and the pressure inside the aircraft _____________ with height
Fill in the blank(s) with correct word