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How long would a 2.90 kW space heater have to run to put into a kitchen the same amount of heat as a refrigerator (coefficient of performance = 2.68) does when it freezes 1.73 kg of water at 18.8°C into ice at 0°C?
In the Bohr model of the hydrogen atom, an electron moves in a circular path around a proton. The speed of the electron is approximately 2.19 106 m/s. Find the centripetal acceleration of the electron
A soccer player kicks a ball, giving it an initial velocity of 17.2 m/s in the horizontal direction, How far down the field does the ball travel before landing
aircraft has cross section of 710 m^2, what percentage of radiated energy will be detected
How much water must be displaced to float a cubical block of wood (density 655 kg/m^3) that is 15.0 cm on a side
A girl floats in a lake with 97 percent of her body beneaththe water. What is her mass density
The mass of Pluto was not known until 1978 when a moon of Pluto was finally discovered. How did the discovery of this moon help
A piece of copper wire has a resistance per unit length of 5.65 10-3 ?/m. The wire is wound into a thin, Find the magnetic field strength at the center of the coil
a car initially running at 10 m/s applies brake and stops in 10 secs. What is the deceleration produced by the brakes
A neutron causes the element 88X232 to change according to the reaction 0n1 + 88X232 ---->ZYA + . Identify the (a) atomic number and (b) atomic mass number of the daughter nucleus. (c) This product subsequently undergoes Beta- decay, and its daughter..
Find the mode configurations and frequencies for transverse oscillations of a beaded string of 5 beads with one end fixed and one end free to move. Plot the five points on a dispersion relationship ω vs k
An airplane with a mass of 2.6*10^6 kg. has the air flow past the lower surface of the wings at 100 m/s. If the wings have a surface area of 1200 m2, how fast should the air flow over the upper surface of the wing if the plane is to stay in the ai..
A cylinder of radius b has a moment of inertia I = (1=2)mb2. The cylinder is rolled along a °at horizontal surface at speed v, What is the initial speed v of the cylinder
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