What is the average power if the current is Io sin(?t) and the voltage is Vo sin(?t)?
What will be an ideal response?
(IoVo) /2
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Neglecting gravity, doubling the exhaust velocity from a single stage rocket initially at rest changes the final velocity attainable by what factor? Assume all other variables, such as the mass of the rocket and the mass of the fuel, do not change
a. The final velocity stays the same. b. The final velocity doubles. c. The final velocity increases by a factor of 0.693. d. The final velocity increases by a factor of 0.310.
The presence of a magnetic field is a good indication that:
A) the Earth's interior is similar to Mercury's, as both have fields. B) a huge iron meteorite lies somewhere high up in the mantle, not in the core. C) we have a liquid metal outer core, spinning rapidly as we rotate. D) the Earth's interior must be completely molten to the center. E) the Earth's interior has had time to solidify, with a rigid bar magnet created.
What is the highest frequency of the photons produced by a 29-kV x-ray machine? (h = 6.63 × 10^?34 J?s)
a. 4.4E+18 Hz b. 7.0E+15 Hz c. 4.4E+15 Hz d. 7.0E+18 Hz e. 3.1E+20 Hz
The mean free path of a molecule is 
m in an ideal gas at standard temperature and pressure. What is the mean free path when the pressure of the gas is doubled and the temperature is constant?
A. 
B. 
C. 
D. 
E. 