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A pendulum bob of mass 'm' is hung from a light string,the bob then moves in a horizontal circle of radius 'r' and the string makes an angle alpha with the vertical. If the angular velocity of the bob is 'w' and 'g' is the acceleration due to gravity. Obtain an expression for tan alpha.
Two point charges Q1 = +4.30 nC and Q2 = -2.30 nC are separated by 27.0 cm. What is the potential energy of the pair of charges
A hiker, who weighs 919 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 4410 N, and rests on two concrete supports, one on each end. He stops 1/3 of the way along the bridge.
Suppose you are planning a trip in which a spacecraft is to travel at a constant velocity for exactly nine months, as measured by a clock on board the spacecraft, and then return home at the same speed. Upon return, the people on earth will have a..
A woman with mass 49.5 kg is standing on the rim of a large disk that is rotating at 0.490 rev/s about an axis perpendicular to it through its center. Calculate the magnitude of the total angular momentum of the woman-plus-disk system
A plano convex lens is placed convex side down on a plane glass plate and illuminated from the above with red loght of wavelength of 625nm. what are the curvature and focal length of the convex surface of the lens
An electron is a subatomic particle (m = 9.11 x 10-31 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +8.11 x 105 m/s to a final velocity of 1.21 x 106 m/s while traveling a di..
Find the distance point P on the tip of the blade has traveled in 3 sec. Also, find the magnitude of the acceleration of point P when t = 3 sec.
A guitar string is74cm long and has a mass of 3.6 g. The distance from the bridge to the support post isL= 60 cm, and the string is under a tension of533N. What is the frequency of the second overtone
Water is supplied to an office building 24.0 m high through a pipe at ground level. Find the minimum pressure in the supply pipe
two sources source a and source b are emitting the same frequency f with the same amplitude a but are out of phase from
in a x-ray tube electrons are accelerated through a potential of 10 000v. how much energy does the accelerated
Cloud droplets cannot grow into rain droplets by condensation alone. How would you have to alter the basic assumption of this example to make cloud droplets grow to raindrops by condensation only?
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