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An electric water heater is designed to produce 44 kW of heat when it is connected to a 240 Volt source. If the heater is 80 percent efficient, determine how long would it take to heat 47gal of water from 20oC to 80oC.
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A mass m is projected vertically upwards at t = 0 from y = 0 with initial velocity v0 > 0 along the y-axis. (+y is upwards) The mass moves under the constant force of gravity, and also a force of air resistance with magn ...
Question: Some plants disperse their seeds when the fruit splits and contracts, propelling the seeds through the air. The trajectory of these seeds can be determined with a high-speed camera. In an experiment on one type ...
Question: Tarzan, in one tree, sights Jane in another tree. He grabs the end of a vine with length 20 m that makes an angle of 45 degrees with the vertical, steps off his tree limb, and swings down and then up to Jane's ...
Question: A simple pendulum consisting of a mass m attached to a massless string of length L is performing harmonic oscillations for small angles. Determine the period T in terms of L and the gravitational acceleration c ...
Question: The radius of the earth's very nearly circular orbit around the sunis 1.5 x 10^11 m. Find the magnitude of the earth's velocity as it travels around the sun. Assume a year of 365 days. Express your answer using ...
Question: Patients undergoing an MRI occasionally report seeing flashes of light. Some practitioners assume that this results from electric stimulation of the eye by the emf induced by the rapidly changing fields of an M ...
Question: A series RLC circuit of R = 200 ohm, L = 0.900 H and C = 2.00 uF carries an rms current of 0.250 A with a frequency of 100 Hz. (a) What is the average rate at which electrical energy isconverted to heat in the ...
Question: An object of mass m is traveling on a horizontal surface. There is a coefficient of kinetic friction µ between the object and the surface. The object has speed v when it reaches x=0 and encounters a spring. Th ...
An ideal gas of molecules (of mass 3.3 x 10 -27kg) is at temperature 400 K and density 0.1 kg/m3. The gas is confined within a cube of side length 2 m. What is magnitude of the average force experienced by one of the wal ...
Question: Three odd-shaped blocks of chocolate have the following masses and center-of-mass coordinates: (1) 0.300kg , (0.300 m, 0.300 m); (2) 0.400kg , (0.200 m, -0.400 m); (3) 0.200 kg , (-0.300m , 0.600 m). Find the x ...
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