An astronaut traveling with a speed v = 0.90 c holds a meterstick in his hand. If he measures its length, he will obtain a value of
a. 1.0 m
b. 2.3 m
c. 0.19 m
d. 0.43 m
e. 0.81 m
A
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Impedance: The impedance of an RC circuit with a 200-? resistor s 1060 ?. If the frequency of the applied ac voltage is 20.0 Hz, what is the capacitance of the capacitor?
A. 6.64 ?F B. 7.64 ?F C. 8.64 ?F D. 9.64 ?F E. 200 ?F
The Moon's surface gravity is only half the Earth's
Indicate whether the statement is true or false
Because we know that the half-lives of many radioactive isotopes are millions of years, we can deduce that
a. the longer it exists the more radioactive nuclei Earth produces. b. the sun is the source of all the radioactive nuclei on Earth. c. there must have been many more radioactive nuclei on Earth when life began. d. there must have been far fewer radioactive nuclei on Earth before life began. e. the natural radioactivity of minerals on the Earth was created by the Earth's internal temperature.
The latent heat of vaporization of water is roughly 10 times the latent heat of fusion of water. The amount of heat required to boil away 1 kg of water is 10 times the amount of heat required to melt 1 kg of ice
Indicate whether the statement is true or false