A 5.0-m long, 12-kg uniform ladder rests against a smooth vertical wall with the bottom of the ladder 3.0 m from the wall. The coefficient of static friction between the floor and the ladder is 0.28
What distance, measured along the ladder from the bottom, can a 60-kg person climb before the ladder starts to slip? A) 4.0 m
B) 3.7 m
C) 1.7 m
D) 1.3 m
E) 3.3 m
C
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One watt is equal to ______________ per second
a. one kilogram b. one newton c. one joule d. one meter
Scientists suspect that Mars once had a global magnetic field. Assuming this is true, which of the following could explain why Mars today lacks a global magnetic field like that of Earth?
A) Mars's interior has cooled so much that its molten core layer no longer undergoes convection. B) Mars rotates much slower than the Earth. C) The Martian core is made of rock, while Earth's core is made of metal. D) Mars is too far from the Sun to have a global magnetic field.
Consider three galaxies, Alpha, Beta and Gamma. An astronomer in Beta sees each of the other two galaxies moving away from him in opposite directions at 0.70c. At what speed would an observer in Alpha see the galaxy Gamma moving?
A) 1.4c B) 0.94c C) 0.98c D) 0.82c E) 0.70c
The oceanic conveyor is often referred to as thermohaline circulation. Explain why this is an appropriate name
What will be an ideal response?