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Two children hang by their hands from the same tree branch. The branch is straight, and grows out from the tree trunk at an angle of 27 degree above the horizontal. One child, with a mass of 44.0 kilogram, is hanging 1.30 meter along the branch from the tree trunk. The other child, with a mass of 35 kilogram, is hanging 2.10 meter from the tree trunk. Find the magnitude of the net torque exerted on the branch by the children? Suppose that the axis is located where the branch joins the tree trunk and is perpendicular to the plane formed by the trunk and the branch.
A man with mass m1 = 66.0 kg stands at the left end of a uniform boat with mass m2 = 177.0 kg and a length L = 3.5 m. What is the location of the center of mass of the system
A gallon of gasoline contains about 1.3x10^8 joules of energy. A 2000-kg car traveling 20 m/s skids to a stop. Estimate how much gasoline it will take to bring the car back to the original speed
an electric motor rotating a workshop grinding wheel at a rate of 9.80 x 101 revmin is switched off. assume the wheel
a styrofoam cup holding 155 g of hot water at 97degc cools to room temperature 23.0degc. what is the change in entropy
Suppose you look through a 3.3 mm thick window comprised of a material whose refractive index is 1.63. Find by what time interval is the light you see delayed by having to go through glass instead of air
A lawn roller in the form of a solid uniform cylinder is being pulled horizontally with a horizontal force B applied to an axle during the center of the roller. The roller radius 0.59 m and mass 48 kg.
the propeller of an toy airplace is at rest when the controller starts the engine. two seconds later the propeller is
Two friends are carrying a crate of mass 200 kg up a flight of stairs. The crate has length 1.25 m and height 0.500 m, What is the magnitude of the upper person's force
using a 60 cm focal length converging lens one wishes to obtain a virtual image which is four times as large as the
An electron (q=-e) completes half of a circular orbit of radius r around a nucleus with Q=+3e. By how much does the electric potential energy change
A 3.00-kg block starts from rest at the top of a 29.0° incline and slides 2.00 m down the incline in 1.65 s. Find the frictional force acting on the block
The time constant of a RC circuit is 5 sec. How long does it takefor the capacitor in this circuit to accumulate about 50% voltage of the total voltage? Assume the capacitor has zero volt at the beginning.
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