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A power plant operates at 25% efficiency. The exhaust heat is let out into the air which raises the local air temperature by 8o. The power output of the plant is 900 MW. You want to check the impact on the local climate so you calculate the total volume of air that will be heated per day. Assuming the density of the air to be 1.3 kg/m3 and the specific heat to be 1.0 kJ/kg what is the volume?
If Darth Vader was 50 years old when he left his galaxy in 2007, how old would he be if he returned in 2025 if he had traveled at a rate of 2.8 × 108 m/s?
what is the final position of the man. What is the magnitude of the electric field (in N/C) at the point (-2.0 m, 3.0 m).
A charged paint is spread in a very thin uniform layer over the surface of a plastic sphere of diameter 13.0 cm, giving it a charge of -17.0 microC. Find the electric field just inside the paint layer
A sinusoidal EM wave has an electric field amplitude Em = 30.6 mV/m. What is the average energy density
A mine elevator is supported by a 2.2 cm diameter steel cable (Ultimate Strength = 600 MN/m2). The mass of the elevator and its contents is 800 kg. The modulus of elasticity of the cable is 570x103 MN/m2.
A coin is dropped from a hot-air balloon that is 295 m above the ground and rising at 8.5 m/s upward. Find the maximum height reached for the coin in meters
Two stars are 8.0 light years away and can just be resolved by a 20 in telescope equipped with a filter that only allows light of wavelength 500 nm to pass.
A neutron having mass of 1.67 X 10^-27 kg and moving at 10^8 m/s collides with a deutron at rest and sticks to it. Given that the mass of neutron is 3.34 X 10^-27 kg.
In the absence of air resistance, a ballplayer tosses a ball straight up. By how much does the speed of the ball decrease each second while it is ascending
A bungee jumper (m = 63.00 kilogram) tied to a 45.00 meter cord, leaps off a 75.00 meter tall bridge. Obtain what size impulse is exerted on the bungee jumper while the cord stretches
a fan at a rock concert is 35.0m from the stage and at this point the sound intensity level is 108db . sound is
A car of mass 2000kg is lifted up a a distance of 30m by a crane in 1 min. A second crane does the same job in 2 min. Do the crane consume the same or diffrent amounts of fuels
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