The crust of Mars is believed to _____________ than Earth's
a. be much thinner
b. be younger
c. contain more water
d. be more geologically active
e. be much stronger
e
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If we double only the amplitude of a vibrating ideal mass-and-spring system, the mechanical energy of the system
A) increases by a factor of . B) increases by a factor of 2. C) increases by a factor of 3. D) increases by a factor of 4. E) does not change.
Which type of generating plant would you expect to be more energy efficient, steam-electric or hydroelectric?
A) Hydroelectric, because the lake and river water provides natural cooling for the exhaust. B) Steam-electric, because there is so much more energy per ton in fossil fuels than in water behind a dam. C) Hydroelectric, because it is not a heat engine and so is not restricted by the second law of thermodynamics. D) Hydroelectric, because there is so much energy in a large lake raised up behind a dam. E) Steam-electric, because it can have a very high operating temperature due to having a large and thick boiler.
A coil of 160 turns and area 0.20 m2 is placed with its axis parallel to a magnetic field of initial magnitude 0.40 T. The magnetic field changes uniformly from 0.40 T in the +x direction to 0.40 T in the -x direction in 2.0 s
If the resistance of the coil is 16 ?, at what rate is power generated in the coil? A) 20 W B) 25 W C) 15 W D) 5.0 W E) 10 W
A 2.50-kg projectile is launched at an angle of 20.0° above the horizontal with an initial speed of 100 m/s from the top of a building 40 m high. If the projectile is traveling 85.0 m/s at its maximum height of 47.0 m, how much work has been done on the projectile by air friction?
a. –3.3E+3 J b. 1.7E+2 J c. –3.5E+3 J d. 2.4E+4 J