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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 24.3° above the horizontal. One child, by a mass of 45.6 kg, is hanging 1.20 m along the branch from the tree trunk. The other child, with a mass of 35.7 kg, is hanging 2.13 m from the tree trunk. What is 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 with the branch and the trunk.
A transformer has310turns in the primary coil and130in the secondary coil. By what factor does it change the current
At 100 degrees celsius the rms speed of nitrogen molecules is 576 m/s. Estimate the rate of molecular collisions (collisions/s) on this wall
A uranium-fuelled research reactor has a cubic shape with sides of length 1.0 m. estimate the power out of the reactor in units of watts
A 0.575 kg mass falls from a height of 3.95 m. If all of the energy of this mass could be converted to visible light of wavelength 5.29E-7 m
The track near the top of your favorite roller coaster has a circular shape with a diameter of 22 m. What is the speed of the roller coaster
A charged particle enters a uniform magnetic field and follows the circular path shown in the drawing. Determine the mass of the particle
A microwave oven is powered with an electron tube called a magnetron that generates electromagnetic waves of frequency 2.30 GHz. The microwaves enter the oven and are reflected with the walls.
A 20 kg uniform beam is placed on two supporting stands on either end. A 75 kg painter stands at 1.2 m from one of the ends. find the forces at the two supports
A ship has a mass of 10,000 kilogram when loaded. Find does the ship ride higher in fresh water or seawater and Find the weight of water that it will displace when floating
A charge of 2.50 is held fixed at the origin. A second charge of 2.50 is released from rest at the position (1.25 , 0.570 ). If the mass of the second charge is 2.75 , what is its speed when it moves infinitely far from the origin
a machinist turns the power on to a grinding wheel at rest at time t 0 s. the wheel accelerates uniformly for 10 s and
What is the range of wavelengths for FM radio (88 MHz to 108 MHz), What is the range of wavelengths for AM radio
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