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A long uniform wooden bar with square crosssection floats on water. Show that , if the relativedensity of wood is 0.50, the bar will float with all fourfaces making an angle of 45 degrees with the water surface. ( Hint : The bar floats in theequilibrium position for which the potential energy is a minimum.)
A bare helium nucleus has two positive charges and a mass of 6.64 multiplied by 10-27 kg. What voltage would be needed to obtain this energy
A uniform rod of length 0.790 m and mass 14.50 kg is balanced on a sharp edge at 0.650 m from the left end. At the left end hangs a mass of 45-kg and the right end hangs an unknown mass so that the whole assembly is in equilibrium.
Consider a swinging pendulum with length l= 10 cm, a mass of 1 gm swinging at the end of it with an amplitude, Calculate the total energy ( potential plus kinetic) in ergs of the swinging pendulum
A 170 object is taken to a height of 360 above the Earth's surface. What is the object's weight at this height
Two equal, but oppositely charged particles are attracted to each other electrically. evaluate the magnitude of the charges
The gravitational force between two masses M and m seperated by a distance r is 40 N. What is the new force when this distance is halved
As the captain of the scientific team sent to Planet Physics, one of your tasks is to measure g. You have a long, thin wire labeled 1.41g/m and a 1.30kg weight. You have your accurate space cadet chronometer but, unfortunately, you seem to have fo..
Approximately how much electricity is generated from nuclear power each year in the US? Given the average fuel burnup above, What is the energy input for enrichment (via centrifuge method) as a fraction of the electricity generated by the fuel produc..
Assume that your reaction time is 0.50 s and that your car brakes with constant acceleration. How far are you from the intersection when you begin to apply the brakes? Illustrate what acceleration will bring you to rest right at the intersection?
An archer wishes to shoot an arrow at a target at eye level a distance of 49.0 m away. what angle should the arrow make with the horizontal as it is being shot
An 8-m-long beam, weighing 14,700 N, is hinged to a wall and supported by a light rope that is attached 2.0 m from the free end of the beam. calculate the reaction force of the wall on the beam
What focal length does the lens need. Find out the electrostatic force exerted on one sphere by the other.
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