An astronaut in a rocket moving with a speed v = 0.6c relative to Earth performs a collision experiment with two small steel balls and concludes the both momentum and energy are conserved. What would an Earth observer conclude?
A. only momentum is conserved
B. only energy is conserved
C. neither energy or momentum is conserved
D. both energy and momentum are conserved
D. both energy and momentum are conserved
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A balloon is filled with cold air and placed in a warm room. It is NOT in thermal equilibrium with the air of the room until:
A. it rises to the ceiling B. it sinks to the floor C. it stops expanding D. it starts to contract E. none of the above
Using Equation 10-52 or 10-53, determine the approximate convective heat transfer coefficient for water boiling at atmospheric pressure in a container having a surface temperature of 130ºC. Compare this to a value obtained by using Equation 10-6.
Protons and neutrons are held together by the
A. strong nuclear force. B. weak nuclear force. C. electromagnetic force. D. gravitational force.
A white dwarf supernova leaves behind
A) a newborn star. B) a white dwarf. C) nothing. D) a neutron star or black hole.