A rock is thrown directly upward from the edge of a flat roof of a building that is 56.3 meters tall. The rock misses the building on its way down, and is observed to strike the ground 4.00 seconds after being thrown
Take the acceleration due to gravity to have magnitude 9.80 m/s2 and neglect any effects of air resistance. With what speed was the rock thrown?
5.53 m/s
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An adiabatic expansion refers to the fact that
a. no heat is transferred between a system and its surroundings. b. the pressure remains constant. c. the temperature remains constant. d. the volume remains constant.
The Sun is a slightly variable star. What if the surface temperature of the Sun were to increase from 6 000 K to 6 100 K, what would be the increase in total power radiated assuming no other changes such as radius or emissivity?
a. 1.6% b. 6.8% c. 3.4% d. 14%
When the nuclear reactions begin making too much energy in a star, by virtue of the natural thermostat, the star:
A) would expand slightly. B) would increase its central temperature. C) would increase its density. D) would reduce the mass by a factor of 0.5.
All isotopes are unstable which have proton number greater than
A) 73. B) 12. C) 83. D) 78. E) 26.