Why do the patterns of the stars in our sky look the same from year to year?
A) because the stars in the constellations are so far away
B) because the stars in the constellations are not moving
C) because the stars in the constellations all move at the same speeds and in the same directions, so they don't change their relative positions
D) because the stars in the constellations typically move so slowly – typically about the speed of a snail – that their motions are not noticeable
A) because the stars in the constellations are so far away
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Which of the following is a technique that can be used to speed up a spacecraft without the need for extra fuel?
A) a gravitational slingshot, in which the spacecraft gains momentum by flying near a planet B) releasing unnecessary weight after takeoff to make the spacecraft lighter C) flattening after takeoff to make the spacecraft more aerodynamic D) landing on a fast-moving asteroid and relaunching at high speed E) collect material in space that can power the spacecraft
A body at the end of a spring oscillates up and down ten times in five seconds. The period of oscillation is __________
Fill in the blank(s) with correct word
The atmosphere of Mars consists mainly of ________.
A. nitrogen B. carbon monoxide C. carbon dioxide D. oxygen
To determine the height of a flagpole, Abby throws a ball straight up and times it. She sees that the ball goes by the top of the pole after 0.50 s and then reaches the top of the pole again after a total elapsed time of 4.1 s
How high is the pole above the point where the ball was launched? (You can ignore air resistance.) A) 10 m B) 13 m C) 16 m D) 18 m E) 26 m