When Mary is 3.00 m from the center of a merry-go-round, her tangential speed is a constant 1.88 m/s. (a) What is her angular speed in rad/s? (b) What is the magnitude of her linear acceleration?
What will be an ideal response?
(a) 0.627 rad/s (b) 1.18 m/s2
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A boy on a skate board skates off a horizontal bench at a velocity of 10 m/s. One tenth of a second after he leaves the bench, to two significant figures, the magnitudes of his velocity and acceleration are:
A. 10 m/s; 9.8 m/s2. B. 9.0 m/s; 9.8 m/s2. C. 9.0 m/s; 9.0 m/s2. D. 1.0 m/s; 9.0 m/s2. E. 1.0 m/s; 9.8 m/s2.
Venus rotates so rapidly that the dominant form of atmospheric circulation is powered by
a. winds moving from its equator to its poles. b. heated air escaping from its volcanoes moving along the equator. c. winds moving from its poles to its equator. d. heated air escaping from active tectonic plates.
Energy Levels: The energy difference between adjacent orbit radii in a hydrogen atom
A. increases with increasing values of n. B. decreases with increasing values of n. C. remains constant for all values of n. D. varies randomly with increasing values of n.
Two long parallel wires 40 cm apart are carrying currents of 10 A and 30 A in the opposite direction. What is the magnitude of the magnetic field halfway between the wires?
a. 3.0 × 10^–5 T c. 1.0 × 10^–5 T b. 2.0 × 10^–5 T d. 4.0 × 10^–5 T