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The 66.5 kilogram climber is supported in the "chimney" by the friction forces exerted on his shoes and back. The static coefficients of friction between his shoes and the wall, and between his back and the wall, are 0.89 and 0.64, correspondingly. Suppose the walls are vertical and that the static friction forces are both at their maximum. Neglect his grip on the rope. Calculate the minimum normal force he must exert.
A moving 4.3 kg block collides with ahorizontal spring whose spring constant is 321 N/m, What is the speed of the block when it hits the spring
Airplane one flies due east at 250 km/h relative to the ground. What is the velocity of airplane one relative to airplane two
Calculate the total angular momentum of our Moon relative to the center of the Earth. You may assume that the Moon is a uniform sphere
A car is travelling at 26 m/s when the driver spots a large pothole in road a distance 34 m ahead. She at once applies her brakes. If her acceleration is -7.5 m/s2, does she manage to stop before reaching the pothole.
during test-out procedures a 239pu fueled thermal reactor is operated for a time at a power of 1 mw. the power is then
Compute the magnitude of the electric field at the center of a square with sides 22.2 cm long if the corners, taken in rotation, have charges of 1.14 ?C, 2.28 ?C, 3.42 ?C, and 4.56 ?C (all positive).
At a factory, a noon whistle is sounding with a frequency of 480-Hz. As a car travelling at 79 km/h approaches the factory, the driver hears the whistle at frequency fi. After driving past the factory.
a coil of self inductance 7.5 mh and resistance of 30 w is placed across the terminals of a 12-v battery of negligible
an 82 kg logger is standing on a stationary 360 kg log floating at rest in a pond. the logger begins to walk along the
a soccer player can kick the ball 24m on level ground with its initial velocity at 45 degrees to the horizontal. at the
When two identical ions are separated by a distance of 8.3x10^-10m and the electrostatic force each exerts on the other is 5.3x10^-9N How many electrons are missing from each ion
if you hold a 40 cm high square plane mirror 45 cm from your eyes, how far are you from the pole
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