The main process by which heat flows upward through the lithosphere is
A) conduction.
B) convection.
C) radiation.
D) accretion.
E) differentiation.
A
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The Moon has an angular diameter of 0.5°. What is the Moon's angular diameter in minutes of arc?
a. 0.5 b. 30 c. 50 d. 1800 e. 60.5
When a bar magnet is thrust into a coil of wire, the coil
A) attracts the magnet as it enters. B) repels the magnet as it enters. C) both of these D) none of the above
A particle confined to motion along the x axis moves with constant acceleration from x = 2.0 m to x = 8.0 m during a 2.5-s time interval. The velocity of the particle at x = 8.0 m is 2.8 m/s. What is the acceleration during this time interval?
a. 0.48 m/s2 b. 0.32 m/s2 c. 0.64 m/s2 d. 0.80 m/s2 e. 0.57 m/s2
The owner of a cabin that is located on a small stream is thinking of placing a dam across the stream to create a possible drop of 120 cm. The stream is measured to have approximate dimensions of 180 cm by 10 cm and a leaf on the water’s surface is observed to travel 10 m in 8 s. If an 80% efficient turbine is used, how much power can the owner expect to generate?
(A) 1 kW (B) 2 kW (C) 3 kW (D) 4 kW