According to quantum field theory, the universe if made of
A) photons.
B) quantized fields.
C) electromagnetic fields.
D) baseball fields.
E) particles moving in empty space.
E
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A star's apparent magnitude is a measure of
a. how bright it appears to us if it is at its actual distance. b. how bright it appears to us at a standard distance of 10 pc. c. its energy output per second compared to the Sun. d. its mass in solar masses. e. its surface temperature in Kelvin.
In a thunderstorm cloud, the concentration of negative charge is in the __________ portion of the cloud
Fill in the blank(s) with correct word
Estimate the volume of a helium-filled balloon at STP if it is to lift a payload of 450 kg. The density of air is 1.29 kg/m3 and helium has a density of 0.178 kg/m3
a. 2 500 m3 b. 310 m3 c. 410 m3 d. 350 m3 e. 500 m3
A 120 N traffic light is located at the midpoint of a cable between two poles. The cable makes and angle of 30
to the horizontal at each pole. What is the tension in the cable?
A. 60.0 N B. 90.0 N C. 140 N D. 110 N E. 120 N