If the velocity of an object is zero at one instant, what is true about the acceleration of that object? (There could be more than one correct choice.)
A) The acceleration could be positive.
B) The acceleration could be negative.
C) The acceleration could be zero.
D) The acceleration must be zero.
A, B, C
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What is the origin of short gamma ray bursts?
A) the collision of stars in the dense nuclei of distant galaxies B) new stars forming in the Milky Way C) very powerful supernovae occurring in distant galaxies D) supernovae in the Milky Way E) It is not known, but it may be the collision of a neutron star with a black hole.
Power: The figure shows a graph of the power dissipated in a resistor as a function of the resistance. What quantity does the slope of this graph represent?
A. the current in the resistor B. the potential difference across the resistor C. the reciprocal of the current in the resistor D. the square of the current in the resistor E. the resistivity of the resistor
Why did early astronomers conclude that Earth had to be motionless?
Gas falling into a black hole:
a. is heated to millions of degrees through the loss of gravitational energy b. is cooled to near absolute zero through the loss of gravitational energy c. releases energy, all of which is absorbed by the black hole d. never reaches the black hole due to the effect of time dilation e. orbits the black hole but cannot cross the event horizon