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One tonne of coal its fully burned, releases 28(GJ) of thermal energy however for each tonne of coal burned its boiler, a model electrical power plant produces only 9.5 GJ and electrical energy? What is the energy conversion efficiency of that power plant?
an object is thrown upwards with a speed of 14 m/s. How long does it take it to reach its max height
The coefficient of static friction between the tires of amotorcycle and the road is 0.56. what is the radius of the tightest unbanked turn that the driver can hope to handle
Light of wavelength 497.0 nm appers to have a wavelength of 500.2 nm when it reaches eart from a distance star. find the velocity of the star if the speed.
What is the average force felt by a 0.06 kg tennis ball if it strikes the racket at a speed of 30m/s and leaves the racket with a speed of 50m/s in the opposite direction
During a particular thunderstorm, the electric potential between acloud and the ground is Vcloud -Vground = 2.2 x 108 V, with thecloud being at the higher potential. What is the change in anelectron's potential energy when the electron moves from th..
two untethered astronauts at rest are in space when one pushes off the other. How far apart are the two astronauts after 1 minute
A heater coil connected to a 240 Vrms ac line has a resistance of 34 Ohms. find min values of the instantaneous power
One of the asteroids, Ida, looks like an elongated potato. Surprisingly it has a tiny (compared to Ida) spherical moon! what must your orbital speed be
A Styrofoam cup holding 90 g of hot water at 95°C cools to room temperature, 23.0°C. What is the change in entropy of the room? Neglect the specific heat of the cup and any change in temperature of the room.
A 16.0-N weight slides down a rough inclined plane that makes an angle of 28.0° with the horizontal. How much work is done against friction
A mass spectrometer, sketched below, is a device used to separate different ions. Such ions with a well-defined velocity vo enter through a slit into a region of uniform magnetic field B, where they follow a semicircular path until they strike a d..
One fires a bullet (m=50g) at a block of wood (m=2kg) resting on a frictionless surface. How much energy is lost
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