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Estimate how much power is saved if the voltage is stepped up from 240 V to 1200 V and then down again, rather than simply transmitting at 240 V. Assume the transformers are each 99% efficient.
On a cool morning, when the temperature is 14.0 ^circC, you measure pressure in your car tires to be 20.0 psi. After driving 40.0 mi on the freeway, the temperature of your tires is 50.0 ^circC.
Light of wavelength 646nm from a distant source is incident on a slit .720mm wide, What is the distance between the two dark fringes on either side of the central bright fringe
An airplane is flying at 165.1mi/h (its speed in still air) in a direction such that with a wind of 64.4mi/h blowing from east to west, What must be the plane's heading (direction) for it to fly directly south
questionair has a small regularly negligible index of refraction. it is 1.0002926. this causes the sun to actually be
A spelunker is surveying a cave. She follows a passage 150m straight west, then 230m in a direction 45, Use a scale drawing to determine the magnitude of the fourth displacement, Determine the direction of the fourth displacement
In the sketch, the small hydraulic piston has a diameter of 2.3cm. how many newtons of force are exerted by the large piston
A heat engine has a useful work output of 4.0 kJ and expels 8.0 kJ of exhaust energy in each cycle. what is the engine's thermal efficiency
A liquid of refractive index 'n' is filled in a beaker of height 'h'. Find the amount by which a coin at its bottom seems to be raised.
Two masses are connected by a string as shown in the figure. Mass = 2.1 rests on a frictionless inclined plane, what will be the resulting acceleration of the masses
Objective questions based on force and acceleration.
Illustrate what average power must the winch supply in order to accelerate a 174-kg ultra-light glider from rest to 23.0 m/s over a horizontal distance of 50.0 m? Assume that friction and air resistance are negligible, and that the tension in the ..
Consider a spherical Gaussian surface and three charges: q1 = 1.62?C , q2 = -2.45?C , and q3 = 3.57?C . Find the electric flux through the Gaussian surface
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