What is one possible reasons Jupiter and Saturn radiate more energy than they receive from the Sun?
a. Magnetic and electric fields heat the planet.
b. Fusion reactions of hydrogen into helium inside the planet provide an additional heat source.
c. The planets are still radiating heat from when they first formed.
d. Friction between the planet and its moons heat the planet.
c
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What positive effect have supernovae had on the development of life on Earth? a. Supernovae are the main source of background radiation needed for mutations. b. Chemical elements necessary for life can only be formed in supernovae
c. The formation of the Sun was triggered by a supernova event. d. Planets form by accretion of material in the expanding remnant of a supernova. e. Neutrino bombardment was necessary to form the first simple proteins.
What value of B should be used in a velocity selector to separate out 2.0-keV protons if E is fixed at 80 kV/m?
a. 0.18 T b. 0.11 T c. 0.15 T d. 0.13 T e. 0.23 T
Since Einstein, scientists think that the substance that is "waving" when a light wave is transmitted is
A) phlogisten. B) air. C) ether. D) plasma. E) They don't think any material substance is waving.
A square loop (L = 0.20 m) consists of 50 closely wrapped turns, each carrying a current of 0.50 A. The loop is oriented as shown in a uniform magnetic field of 0.40 T directed in the positive y direction. What is the magnitude of the torque on the loop?
a.
0.21 N ? m
b.
0.20 N ? m
c.
0.35 N ? m
d.
0.12 N ? m
e.
1.73 N ? m