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In order to heal properly from a fractured thigh a patient's leg must be kept under traction. In the system shown below the leg a kept under traction by a series of ropes and pulleys attached to a weight W. If the physical therapist specifies that the traction force directed along the leg must be 29N, what should the attached weight W be?
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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. Find the magnitude of the net torque exerted on the branch by the children
A slit of width 0.24mm is illuminated with monochromatic light of wavelength 550nm , and a diffraction pattern is formed on a screen 1.4m from the slit. What is the width of the central maximum
a a concave mirror forms an inverted image four times larger than the object. find the focal length of the mirror
Consider two parallel, horizontal metal plates a distance d = 2.0 cm apart. The upper plate is at +25 volts and the lower one is at 0 Volts. What is the direction of the electric field between the plates
This one is challenging: A thin uniform pole of length 30 m is pivoted at the bottom end. Calculate the most probable point of rupture on the pole as the pole falls
Work function of potassium is 2.25 eV. Find the cutoff wave length of potassium
a 43 mg sample of pure gold 197au is irradiated in a reactor with a steady neutron flux of 51010 neutronss-cm2 long
A photographer in a helicopter ascending vertically at a constant rate of 1.2 m/s accidentally drops a camera out the window when the helicopter is 42.0 m above the ground. How long will it take the camera to reach the ground
A farm house generates its own power at 120/240V AC. A 2-wire 240v copper wire line from the generator shed runs 930 ft to the barn, Calculate the line voltage drop
A female orb spider has a mass of 0.45g . She is suspended from a tree branch by a 1.0m length of 0.0020-mm-diameter silk. If you tap the branch and send a vibration down the thread, how long does it take to reach the spider
A proton accelerates from rest in a uniform electric field of 632 N/C. At some later time, its speed is 1.22 x 106 m/s. Find the magnitude of the acceleration of the proton
A 275 kg piano slides 4.4 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-36). The effective coefficient of kinetic friction is 0.40. a)Calculate the force exerted by the man. b..
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