A 5.00-m-long 200-N uniform ladder, rests against a smooth vertical wall with its base on a horizontal rough floor, a distance of 1.20 m away from the wall. The coefficient of static friction between the ladder and the floor is 0.200
How far up the ladder, measured along the ladder, can a 600-N person climb before the ladder begins to slip? A) 1.50 m
B) 1.26 m
C) 1.05 m
D) 3.95 m
E) 4.56 m
E
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Which of the following is NOT a possible explanation for dark energy?
A: quintessence, a fifth substance to the universe that varies in time. B: cosmological constant. C: gravity leaking out to dimensions besides the three spatial dimensions. D: the speed of light changing dramatically with time. E: all of the above.
The tidal pull of the Sun largely cancels that of the Moon at the ________ phases
Fill in the blank(s) with correct word
Samantha pushes a 60-N crate up a ramp 30 m in length and inclined at 10° with the horizontal. What potential energy change does the crate experience?
a. 1.8E+3 J b. 1.8E+3 J c. 1.2E+1 J d. 3.1E+2 J e. 1.0E+4 J
What happens to the magnitude of the magnetic field inside a long solenoid if the current is doubled?
1.It becomes four times larger. 2.It becomes twice as large. 3.It is unchanged. 4.It becomes one-half as large. 5.It becomes one-fourth as large.