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A 250. MW coal-fired power plant burns fuel with an energy density of 35.0 MJ kg-1. Water enters the temp reduction towerat 293 K and leaves at 350. K at a rate of 4200. kgs-1.
Calculate the energy removed by the water each second and theenergy produced by the combustion of coal each second.
Two positive point charges are a fixed distance apart. the sume of their charges is Qt. what charge must each have in order to a) mazimize the electric force between them, and b) minimize it?
a ships anchor chain is wrapped around a hollow steel drum of mass m 500 kg and radius r 0.5m. the drum is located on
a hollow plastic sphere is held below the surface of a freshwater lake by a cord anchored to the bottom of the lake.
A small body of mass 0.13 kg is undergoing simple harmonic motion of amplitude 9.0 cm and period 0.10 s. What is the maximum value of the force acting on it? If the oscillations are produced by a spring, what is the spring constant?
shows a particle with positive charge q = 1.60 x 10-19 C is moving with speed v = 8.43 x 104 m/s toward a long straight wire with current i = 371 mA. find the magnitude of the force on the particle due to the current
What is the terminal speed for an 84.00 skier going down a 38.0 degree snow-covered slope on wooden skis = 0.06? Assume the skier is 1.70 m tall and 0.500 m wide.
the roller-coaster car is dragged up at the highest point where it is released passing the highest point with speed of
A 140kg- tackler moving at 2.3 m/s meets head-on (and tackles) an 99 kg- halfback moving at 7.0 m/s. What will be their mutual speed immediately after the collision
The electromagnetic wave spectrum is divided into two sections, ionizing and nonionizing radiation. Photons of about 12.4 eV occur right at the dividing line between the two sections
Abolt comes loose from underneath an elevator that is moving upward at a speed of 6.1 m/s. what is the speed of the bolt when it hits the bottom of the shaft
Two 9cm diameter charged disks face each other, 25cm apart. Both disks are charged to - 80 nC.
A 1400-kg sports car accelerates from rest to 95km/h in7.4s What is the average prower delivered by the engine
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