Current evidence suggests that life on Earth
A) originated in shallow ponds on land
B) was delivered from elsewhere in meteorites
C) was deliberately planted by an advanced civilization
D) originated close to deep-sea volcanic vents or underground
D
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Which of the following statements is true of reconnection events?
A) They refer to the breaking of identically directed magnetic field lines in a plasma. B) Kinetic and thermal energy in plasmas with low conductivity are converted to magnetic energy. C) Solar flares occur in active regions where oppositely directed magnetic fields meet and cancel each other. D) They generate and release magnetic fields as long-wavelength photons and low-energy electrons.
Transformers: A generator produces 60 A of current at 120 V. The voltage is usually stepped up to 4500 V by an ideal transformer and transmitted through a power line of total resistance 1.0 ?. Find the number of turns in the secondary if the primary has 200 turns.
A. 5 B. 200 C. 4500 D. 7500
The linear momentum of a truck will be greater than that of a bus if
a. the truck's mass is larger than the bus's but its speed is the same. b. the truck's speed is larger than the bus's but its mass is the same. c. the truck's mass and speed are both larger than the bus's. d. any of the above.
During the inflation that started at about 10^-37 seconds after the Big Bang, the universe expanded by:
a. up to 10^50 in as little as 10^-47 seconds. b. up to 10^42 in as little as 10^-40 seconds. c. up to 10^30 in as little as 10^-36 seconds. d. by about a factor of 10 up to the present time. e. by no significant amount.