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Each second, 1450 m3 of water passes over a waterfall 130 m high. Three-fourths of the kinetic energy gained by the water in falling is transferred to electrical energy by a hydroelectric generator. At what rate does the generator produce electrical energy? (The mass of 1 m3 of water is 1000 kg.)
A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1000 Hz. What is the speed of the bird
Tube A, in a 20°C room, is observed to support standingwaves at frequencies of 48 Hz, 60 Hz and 72 Hz, but not at anyfrequencies in between (but possibly at higher and lower frequencies). Meanwhile tube B, which is the same length, supports standi..
A contact lens is made of plastic with an index of refraction of 1.50. The lens has an outer radius of curvature of +2.0cm and an inner radius of curvature of +2.5cm. What are the focal length and the power of the lens?
A fire hose 10 cm in diameter delivers water at the rate of 21kg/s . The hose terminates in a nozzle 2.6cm in diameter. What is the flow speed in the nozzle
A beam of light in air strikes the surface of a smooth piece of plastic having an index of refraction of 1.55 at an angle with the normal of 20°. The incident light has component E-field amplitudes parallel and perpendicular to the plane of incidence..
A large non conducting sphere of radius 30 cm is uniformlycharged throughout with a net charge of -3μC. Calculatethe electric field at a point inside the sphere at a distance of 10cm from the center.
A 50 kg bag of sand ar 25 degree C falls 10 m onto the pavement and comes to an abrupt stop. What is the dissapative work done on the sand
The four tires of an automobile areinflated to a gauge pressure of 2.0 x 105 Pa. Determine the weight of the automobile
A thick-walled hollow cylinder (inner radius=47 cm, outer radius=66 cm) rolls down a 7° incline. If it starts with a speed of 1.9-m/s, what is its speed after it has travelled 16 m? (m/s).
Light of wavelength 480nm is incident on a metallic surface with a resultant photoelectric stopping potential of .55V. What is the work function of the metal
A 965-kg satellite orbits the Earth at a constant altitude of 94-km. What is the change in the system's potential energy
A wagon is rolling forward on level ground. Friction is negligible.The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 91 kg. The mass of the rock is0.30 kg.
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