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A turntable that turns 10 revolutions each second is locatedon top of a mountain. Mounted on the turntable is a laser thatemits a bright beam of light. As the turntable and laser rotate,the beam also rotates and sweeps across the sky. On a dark nightthe beqam reaches some clouds 10 km away.
a) show that the spot of laser light sweeps across teh cloudsat a speed 628 km/s
b) how fast does the spot of laser light sweep across cloudsthat are twice as far away?
c) at what distance will the laser beam sweep across the skyat the speed of light? (speed of light is 300 000 km/s.)
q1. a horizontal pipe contains water at a pressure of 150 rm kpa flowing with a speed of 1.6 rm ms. the pipe narrows to
Three forces act on a moving object. One force has a magnitude of 86.7 N and is directed due north. Another has a magnitude of 59.9 N and is directed due west. What must be (a) the magnitude and (b) the direction of the third force, such that the obj..
A 65kg trampoline artist jumps vertically upward from the top of a platform that is 2 m above the trampoline with a speed of 4.80m/s.
The pendulum in the figure consists of a uniform disk with radius r = 15.0 cm and mass 420 g attached to a uniform rod with length L = 380 mm and mass 240 g. Calculate the rotational inertia of the pendulum about the pivot point
When you plot 1/Do as a function of 1/Di for a converging lens, the Y-intercept of the best fit line turns out to be 0.055(cm-1). What is the focal length of the converging lens
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A solid spherical target which weighs 10 kg and has a radius of 25 cm rests on a frictionless table. What is the angular speed of the sphere after the collision
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At the Equator near Earth's surface, the magnetic ?eld is approximately 64.5 µT northward and the electric ?eld is about 51 N/C downward in fair weather. Find the magnitude of the gravitational force on the electron
A hanging copper wire with diameter 1.4mm (1.4e-3m) is initially 0.95 m long. Find the approximate value of the effective spring stiffness of the inter atomic force
A guitar string is 90.0 cm long and has a mass of 3.27g . From the bridge to the support post (=?) is 60.0 cm and the string is under a tension of 514 N
A single-turn circular loop of radius 5 cm is to produce a field at its center that will just cancel the earth's field of magnitude 0.7 G directed at 70 below the horizontal north direction. Find the current in the loop.
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