Two radio antennas are 120 m apart on a north-south line. The two antennas radiate in phase at a frequency of 5.6 MHz. All radio measurements are made far from the antennas
What is the smallest angle, reckoned north of east from midway between the antennas, at which destructive interference of the two radio waves occurs? (c = 3.00 × 108 m/s) A) 13°
B) 6.4°
C) 9.7°
D) 16°
E) 19°
A
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Which of the following scenarios involves energy that we would typically calculate with Einstein's formula E=mc2?
A) A small amount of the hydrogen in of a nuclear bomb becomes energy as fusion converts the hydrogen to helium. B) An object accelerated to a great speed has a lot of kinetic energy. C) A mass raised to a great height has a lot of gravitational potential energy. D) A burning piece of wood produces light and heat, therefore giving off radiative and thermal energy.
A runner generates 1260 W of thermal energy. If this heat has to be removed by evaporation, how much water does this runner lose in 15 minutes of running? The latent heat of vaporization of water is 22.6 × 105 J/kg
A) 50 g B) 500 g C) 35 g D) 350 g E) 40 g
The process of crystallization acts to
What will be an ideal response?
Where does most rainfall on Earth finally end up before becoming rain again?
A) underground B) in lakes C) in the oceans D) on the ground surface