An object's angular momentum changes by 10 kg-m2/s in 2.0 s. What magnitude average torque acted on this object?
A) 2.5 N-m
B) 40 N-m
C) 10 N-m
D) 5 N-m
E) 20 N-m
D
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A star's apparent magnitude is a measure of
a. how bright it appears to us if it is at its actual distance. b. how bright it appears to us at a standard distance of 10 pc. c. its energy output per second compared to the Sun. d. its mass in solar masses. e. its surface temperature in Kelvin.
Atomic Nucleus: The primary reason that very large nuclei are unstable is due to
A. the cumulative repulsive force of the protons. B. the cumulative attractive force between the protons and the orbiting electrons. C. the repulsive force between the neutrons and the protons. D. the extreme weakness of the gravitational attraction of the protons.
In the final phases of its "life", our sun will
A) collapse to become a white dwarf. B) turn into a cockroach. C) blow up in a supernova explosion. D) pass through the white dwarf state, then the neutron star state, and finally the black hole state. E) collapse and continue to collapse, forever.
A certain transformer doubles input voltage. If the primary coil has 10 A of current, then the current in the secondary coil is
A) 2 A. B) 5 A. C) 10 A. D) 25 A. E) none of the above