What temperature is needed to fuse helium into carbon?
A) 5,800 K
B) 100,000 K
C) 15 million K
D) 100 million K
E) one billion K
D
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When we glimpse the chromosphere at the start and end of totality, its color is
A) green (the famous flash). B) yellow, like the photosphere below it. C) red, due to ionized hydrogen at lower pressure. D) blue, due to the ionization of nitrogen by the magnetic fields. E) white from the moonlight.
A crate of weight w is being pushed across a horizontal surface by a force directed at an angle of 20° below the horizontal. What is the magnitude of the normal force on the crate?
a. It is less than w. b. It equals w. c. It is more than w. d. None of the above since the coefficient of kinetic friction is not given.
Two identical steel balls are released from rest from the same height and travel along tracks as shown and labeled below
An automobile traveling on a straight, level road at 25 km/h speeds up to 70 km/h in 20 s. What was the magnitude of the auto's acceleration, in meters per second squared?