From what cosmic epoch do the photons in the cosmic background radiation originate?
A) the end of the era of nuclei
B) during the era of nucleosynthesis
C) during the era of galaxy formation
D) the end of the Planck era
E) the moment of the Big Bang
A
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What will be an ideal response?
A Carnot engine
A. consists of zero heat flow and constant pressure processes. B. consists of only processes which do not involve heat flow. C. consists of only isothermal processes. D. absorbs heat at a single high temperature and rejects heat at a single low temperature. E. consists of constant temperature and constant volume processes.
The Pioneer and Voyager space probes passed near the jovian planets without landing or crashing into them
Indicate whether the statement is true or false
A miniature, spring-loaded, radio-controlled gun is mounted on an air puck. The gun's bullet has a mass of 6.00 g, and the gun and puck have a combined mass of 130 g. With the system initially at rest, the radio-controlled trigger releases the bullet, causing the puck and empty gun to move with a speed of 0.500 m/s. Of the total kinetic energy of the gun-puck-bullet system, what percentage is in
the bullet? a. 4% b. 98% c. 96% d. 23% e. 100%