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Hydroelectric power plants convert gravitational potential energy into more useful forms with flowing water downhill during a turbine system to generate electric energy. The Hoover Dam on the Colorado River is 211 m high and generates 4.00 x109 kW · h/y. At what rate should water bellowing during the turbines to generate this power? The density of water is 1.00 kg/L. Suppose a total efficiency of 97.5 percent in converting the water's potential energy into electrical energy.
A balloon is released from a tall building. The total mass of the balloon including the enclosed gas is 1.5kg. Its volume is 2.5m^3. What is the average density of the balloon with gas
How is plutonium produced in a commercial nuclear reactor. Diagram the process involved. What is plutonium used for. Why is it easier to separate plutonium from spent fuel than to separate U-235 from U-238.
A rock is thrown on earth with an initial horizontal velocity and it hits the ground at x meters away from the point where the stone is thrown. how much larger is the new planet's mass relative to earth
A metal ball with a mass of 3.23·10-6 kg and a charge of +4.47 mC has a kinetic energy of 7.55·108 J. how close will it come to the plane before stopping
Green light (? = 546 nm) strikes a single slit at normal incidence. What width slit will produce a central maximum that is 1.70 cm wide on a screen 1.18 m from the slit
An electrical heating coil is immersed in 4.0kg of water at 21 degrees C. What is the potential difference at which the coil operates
After a fall, a 96 kg rock climber finds himself dangling from the end of a rope that had been 17 m long and 9.9 mm in diameter but has stretched by 3.1 cm. For the rope, calculate (a) the strain, (b) the stress, and (c) the Young's modulus.
A man is in a chair that is attached with a rope that goes over amass less, frictionless pulley and back down to the man's hand. Combined mass is 104.0 kg. With what force should he pull the pulley in order to rise with a constant velocity?
A planet orbits a star once every 2.99 107 s in a nearly circular orbit of radius 1.42 1011 m. With respect to the star, determine the angular speed of the planet
A student presses a book between his hands, as the drawing indicates. The forces that he exerts on the front and back covers of the book are vertical to the book and are horizontal.
an electric field of 1.64 kvm and a magnetic field of 0.495 t act on a moving electron to produce no net force. if the
A playground merry-go-round of radius R = 1.80 meter has a moment of inertia I = 250 kg•m2 and is rotating at 9.0 rev/min about a frictionless vertical axle, Determine the new angular speed of the merry-go-round
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