What three properties describe a black hole?
What will be an ideal response?
mass, charge, and angular momentum
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The fundamental force that is the principal cause of what we experience as frictional forces is:
A. gravitational force B. electromagnetic force C. weak force D. strong force
In 2.0 s, a particle moving with constant acceleration along the x axis goes from x = 10 m to x = 50 m. The velocity at the end of this time interval is 10 m/s. What is the acceleration of the particle?
A. +15 m/s2 B. +20 m/s2 C. ?20 m/s2 D. ?10 m/s2 E. ?15 m/s2
The gravitational force that the Earth exerts on the Moon is equal and opposite to that which the Moon exerts on the Earth. Therefore, according to Newton's second law of motion,
A) the Moon and the Earth both have equal accelerations, because the forces are equal. B) the Moon has a larger acceleration than the Earth, because it has a smaller mass. C) the Earth has a larger acceleration than the Moon, because it has a larger mass.
A group of 1.0-?F, 2.0-?F, and 3.0-?F capacitors is connected in parallel across a 24-V potential difference (a battery). How much energy is stored in this three-capacitor combination when the capacitors are fully charged?
A) 1.7 mJ B) 2.1 mJ C) 4.8 mJ D) 7.1 mJ