The energy source for a generator may be
A) a waterfall.
B) steam from a turbine.
C) wind.
D) any of these
E) none of the above
Answer: D
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How are the particles in the elementary particle zoo classified in order to relate them effectively?
a. By particle size. b. By charge. c. By which force the particles participate in. d. By mass. e. By location.
A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 60.0 degrees above the horizontal. What is the maximum height of the projectile?
A. 8.40 m B. 9.50 m C. 10.9 m D. 15.3 m E. 20.2 m
Why is it summer in the Northern Hemisphere when it is winter in the Southern Hemisphere?
A) The Northern Hemisphere is "on top" of Earth and therefore receives more sunlight during the Northern Hemisphere summer. B) The Northern Hemisphere is tilted away from the Sun and receives more indirect sunlight during the Northern Hemisphere summer. C) The Northern Hemisphere is tilted toward the Sun and receives more direct sunlight during the Northern Hemisphere summer. D) It isn't: both hemispheres have the same seasons at the same time. E) The Northern Hemisphere is closer to the Sun than the Southern Hemisphere during the Northern hemisphere summer.
On planet X, the absolute pressure at a depth of 2.00 m below the surface of a liquid nitrogen lake is 5.00 × 105 N/m2
At a depth 5.00 m below the surface, the absolute pressure is 8.00 × 105 N/m2. The density of liquid nitrogen is 808 kg/m3. (a) What is the atmospheric pressure on planet X? (b) What is the acceleration due to gravity on planet X?