The silica content of magma greatly affects its viscosity. Magma with a high silica content has a
A) high viscosity and flows quickly.
B) high viscosity and flows slowly.
C) low viscosity and flows quickly.
D) low viscosity and flows slowly.
Answer: B
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An electric motor on an airplane operates on 24 volts and draws a current of 15 amperes. (a) What is the power consumption of the motor? (b) How much energy does the motor use during a 2 hour flight?
Energy and Mass: During a reaction, a reactant loses 4.8 × 10-28 kg of mass. How many joules of energy are released? (c = 3.0 × 108 m/s)
A. 4.3 × 10-11 J B. 1.4 × 10-19 J C. 1.6 × 10-36 J D. 5.3 × 10-45 J
Jim and Mary are carrying Bob on a horizontal stretcher. The uniform stretcher is 2.00 m long and weighs 80 N. Bob weighs 600 N. Bob's center of gravity is 80 cm from Mary. Jim and Mary are at the ends of the stretcher. The force that Mary is exerting to support the stretcher, with Bob on it, is
A. 550 N. B. 400 N. C. 300 N. D. 280 N. E. 200 N.
You are alone in space and your tether brakes and you are floating motionless relative to your spaceship, which is located a frustrating 10 meters away. Your spacesuit has no jet pack and you have no air to spare. All you have is your wrench. How can you return to your ship?
Fill in the blank(s) with the appropriate word(s).