If you jump vertically while inside a fast-moving train that is slowing down, you land
A) a bit ahead of your original position.
B) at your original position.
C) a bit behind your original position.
Answer: A
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A point charge of 3.0 ?C is located on the y-axis at y = 4.0 m, and another point charge of 6.0 ?C is located on the x-axis at x = 5.0 m. What is the direction (ccw from x axis) of the electric field at (5.0 m, 4.0 m)?
A. 72
B. 18
C. 25
D. 53
E. 34
A horizontal 80-cm-diameter hatch is located on the top of a submersible designed for a diver to escape. If the submersible is 100 m below the surface of the ocean, estimate the minimum force required to open the hatch. Assume Ssaltwater = 1.02.
(A) 300 kN (B) 400 kN (C) 500 kN (D) 600 kN
Which of the following best describes why Earth has tides?
A) Earth gets stretched out because the gravitational force from the Moon is stronger on parts of the Earth that are nearer to the Moon. B) Earth gets stretched out because the Moon pulls from one side, while the Sun pulls from the other. C) Earth's sea level changes constantly because of rainfall. D) Earth bulges near its equator because it is spinning. E) Air pressure from the atmosphere pushes on the surface of the ocean.
The temperature scale that places zero at the point where all atomic and molecular motion ceases is:
A) Fahrenheit. B) Celsius. C) Kelvin. D) centigrade. E) Ransom.