A race car starts from rest on a circular track of radius 400 m. Its speed increases at the constant rate of 0.500 m/s2 . At the point where the magnitudes of the radial and tangential accelerations are equal, determine (a) the speed of the race car, and (b) the elapsed time
14.1 m/s, 28.3 s
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What do sunspots, solar prominences, and solar flares all have in common?
A) They all occur only in the Sun's photosphere. B) They are all shaped by the solar wind. C) They are all strongly influenced by magnetic fields on the Sun. D) They all have about the same temperature.
A 4.0-kg mass has a velocity of 4.0 m/s, east when it explodes into two 2.0-kg masses. After the explosion one of the masses has a velocity of 3.0 m/s at an angle of 60° north of east. What is the magnitude of the velocity of the other mass after the explosion?
a. 7.9 m/s b. 8.9 m/s c. 7.0 m/s d. 6.1 m/s e. 6.7 m/s
A rock from a volcanic eruption is launched straight up into the air with no appreciable air resistance. Which one of the following statements about this rock while it is in the air is correct?
A) On the way up, its acceleration is downward and its velocity is upward, and at the highest point both its velocity and acceleration are zero. B) On the way down, both its velocity and acceleration are downward, and at the highest point both its velocity and acceleration are zero. C) Throughout the motion, the acceleration is downward, and the velocity is always in the same direction as the acceleration. D) The acceleration is downward at all points in the motion. E) The acceleration is downward at all points in the motion except that is zero at the highest point.
Einstein earned the Nobel Prize for his
A) special theory of relativity. B) general theory of relativity. C) development of the equivalence of energy and matter, E = mc2. D) work on the particle nature of light. E) contributions to the development of the fission bomb.