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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.)
Molecules act as tiny springs and have vibration energy and frequency. The frequency of CO molecule is 6.42 x 1013Hz. Calculate the spring constant using the effective mass
A heart defibrillator is charged to 350V. It is connected to a patients chest and allowed to discharge through the heart. how much charge resides on the capacitor?
An inductor has an inductance of .082H. The voltage across the inductor is 18V and has a frequency of 190 Hz. What is the current in the inductor
A rat with an emissivity of .40, total area of .15m^2 and a temperature of 37C. How much energy must the rat's body generate to maintain a skin surface of 37C in a 24 hour period
a charge uniform linear density 9.4 ncm lies on a string that is stretched along an x axis from x 0 to x 3.0 m.
A standard interior staircase has steps each with a rise (height) of 20 cm and a run (horizontal depth) of 25 cm. Research suggests that the stairs would be safer for descent if the run were, instead, 31 cm.
A research submarine has a 10-cm-diameter window that is 8.9cm thick, What is the submarine's maximum safe depth in salt water
You have a thin metal sphere of unknown volume that contains helium gas at low pressure. Given that the volume of the metal sphere, pressure gauge, etc., was 341 mL, how many moles of helium gas would you have
How many kilocalories of heat are produced when the brakes are used to bring a 930 kg car to rest from a speed of 102 km/h.
A block of copper with mass 11153 g is lowered by a string into a large pail of water. what would be the tension in the supporting string
A semicircular section of roller coaster track (Radius=34m) is designed to be able to provide up to 140kN (1.4x10^5N) of support (upward normal force) for coasters without collapsing.
A hare and a tortoise compete in a race over a straight course 2.25 km long. The tortoise crawls at a speed of 0.180 m/s toward the finish line. For how long in time was the hare stationary
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