A thin uniform spherical shell exerts zero force on a particle located inside of the thin shell
Indicate whether the statement is true or false
TRUE
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X-ray telescopes are located in orbit around the Earth because:
A) X-ray telescopes on Earth would have to be too big. B) X-ray telescopes are cheap and easy to launch into space. C) there are too many X-ray telescopes on Earth, so now they are put in space. D) X-rays don't reach the surface of Earth. E) the X-rays that come out of the telescopes are dangerous to humans.
A carpenter is driving a 15.0-g steel nail into a board. His 1.00-kg hammer is moving at 8.50 m/s when it strikes the nail. Half of the kinetic energy of the hammer is converted into internal energyin the nail and does not flow out of the nail
What is the increase in temperature of the nail after the three blows that the carpenter needs to drive the nail in completely? The specific heat of steel is 448 J/kg ? K. A) 8.1 K B) 3.6 K C) 1.8 K D) 2.7 K E) 7.7 K
The energy level diagram for hydrogen
The energy of a photon emitted in a transition from the n = 3 state to the n = 2 state is
a.
1.5 eV.
b.
1.9 eV.
c.
3.4 eV.
d.
10.2 eV.
e.
13.6 eV.
A cup of water is scooped up from a swimming pool of water. Compare the temperature T and the internal energy U of the water, in both the cup and the swimming pool
A) TPool is greater than TCup, and the U is the same. B) TPool is less than TCup, and the U is the same. C) TPool is equal to TCup, and UPool is greater than UCup. D) TPool is equal to TCup, and UPool is less than UCup. E) TPool is equal to TCup, and UPool is equal to UCup.