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A rock is thrown directly upward 56.3 meters off a roof and misses the roof on the way back. It strikes the ground 4 seconds later. Neglecting air resistance, what was the speed of the rock?
A silver coin has the mass of 17.75g. If the atomic mass of silver is 107.868u, how many silver atoms are in the coin
a monochromatic point source of light emits 5.5 w of electromagnetic power uniformly in all directions. find the
An alpha particle is a nucleus of helium. It has twice the charge and four times the mass of the proton. When they were very far away from each other, but headed toward directly each other, a proton and an alpha particle each had an initial speed ..
the parallel-plate capacitor used on each key of a computer keypad is a square 0.5 cm on a side. between the plates is
What is the critical angle for light to stay inside a thin glass rod (n = 1.72) surrounded by air
A thin film of alcohol (n=1.36) lies on a flat glass plate(n=1.51). When monochromatic light, whose wavelength can bechanged, is incident normally, What is the minimum thickness of the film
A coyote can locate a sound source with good accuracy by comparing the arrival times of a sound wave at its two ears. What is the distance between the bird and the coyote's left ear
A piston of radius r = 0.05 m has a stroke within a cylinder of S = 0.2 m. At the bottom of the stoke the cylinder fills with air at T1 = 22.4 C and a pressure of P1 = 100 kPa. What would be the length of the cylinder
The two forces in each pair could have different physical origins (for instance, one of the forces could be due to gravity, and its pair force might be due to friction or electric charge).
A golf ball leaves a golf club by an initial velocity of40.0 meters per second at an angle of 40 degrees with the horizontal. What is the total horizontal distance traveled by the golf ball during the first 2.5 seconds of its flight? What is the vert..
A gyroscope with rotational inertia 6.0 10-3 kg·m2 is precessing in a horizontal plane at 0.50 rad/s under the influence of a 0.28 N·m torque caused by a force pointing vertically downward
A bedroom bureau with a mass of 57 kg, including drawers and clothing, rests on the horizontal floor. What is the static friction force on the bureau initially
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