Because they all involve formation of iron in the cores of massive stars, all Type II supernovae are approximately equally luminous
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FALSE
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An Olympic skier moving at 22.0 m/s down a 30.0° slope encounters a region of wet snow, of coefficient of friction µk = 0.740 . How far down the slope does she go before stopping?
a. 119 m c. 175 m b. 145 m d. 199 m
As measured from the Earth, a spacecraft is moving at speed 0.80c when it releases a probe at speed 0.60c relative to the spacecraft in a forward direction. What would be the speed of the probe as measured from the Earth?
a. 0.70c c. c b. 0.81c d. 0.95c
All of the following statements are true. Which one explains the reason why there is not a solar eclipse at every new Moon?
A) The nodes of the Moon's orbit precess with an 18-year period. B) The orbital plane of the Moon is tilted by about 5° to the ecliptic plane. C) The Moon rotates synchronously with its revolution about Earth. D) The sidereal month is shorter than the lunar month. E) The Moon is the primary cause of tides on Earth.
In South Africa, it's usually quite warm around the time of the Northern Hemisphere winter solstice and quite cool around the time of the summer solstice
Indicate whether the statement is true or false