A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J. He slides all the way down to the valley bottom where his gravitational potential energy becomes zero. His kinetic energy at the bottom will be
a. 0 J c. some value between 0 and 500 J
b. 500 J d. none of the above
B
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Scientists have detected mergers of black holes that have spiraled into each other by
A) detecting gravitational waves from the merger. B) observing distant systems that produce unusually strong gamma-ray emission. C) observing distant systems that produce unusually strong radio emission. D) detecting rapidly pulsating sources of gamma-ray emission.
A certain automobile engine takes in 4.00 kJ of heat and performs 1.10 kJ of mechanical work in each cycle
(a) Calculate the engine's efficiency. (b) How much heat is "wasted" in each cycle? What will be an ideal response?
The Schwarzschild radius of a black hole is that radial distance from the center of a sphere within which not even light can escape
It was first discovered mathematically by Schwarzschild in 1916 after Einstein published his general relativity theory. It can be calculated from a star's mass M as: R = 2GM/c2. Take the radius of both stars A and B as the Schwarzschild radius. If the mass of star A is twice as much as the mass of star B, the average density of star A, compared to star B will be A) the same. B) twice as much. C) half as much. D) four times as much. E) one-fourth as much.
Erosion by alpine glaciers creates
A) V-shaped valleys. B) U-shaped valleys. C) drumlins. D) moraines.