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A regulated 0-50v power supply with 0.9Ohm internal resistance is used to deliver electric power to a 0.1Ohm heating element. Compare the power delivered to the heating element when it is connected directly to the power supply with the power delivered to the element through a matching transformer withN1/N2=3 (step down transformer).
The average speed of a nitrogen molecule in air is about 6.70 * 10^2 m/s, and its mass is about 4.68 * 10^-26 kg. What average force does the molecule exert on the wall
A 420g oscillator has a speed of 128.5cm/s when its displacement is 3.30cm and 59.5cm/s when its displacement is 5.40cm .what is the oscillator's maximum speed
A 7.76 kg crate slides on a horizontal surface. The coefficient of kinetic friction between the surface and the crate is 0.34. find the magnitude of the external force acting on the crate
Two newly discovered planets follow circular orbits around a star in a distant part of the galaxy. What is the orbital period of the faster planet, in years
1. find the mass of 600 cubic centimeters of water.2. what is the volume of 50 kg of water.?3. what is the volume of 50
Calculate at what speed Earth would have to rotate in order that objects at the equator would have no weight. Assume the radius of Earth to be 6400 k
A 0.160-kg baseball traveling 30.0m/s strikes the catcher's mitt, which, in bringing the ball to rest, recoils backward 11.0cm . What was the magnitude of the average force applied by the ball on the glove?
A 0.58-kg mass is hanging from a spring with spring constant 20 N/m. Then the mass is displaced from the equilibrium by 2.9 cm and let go. estimate the resulting angular frequency of the oscillation
question a geothermal power plant uses geothermal water extracted at 160oc at a rate of 440 kgs as the heat source and
a lens is made of a transparent material having an index of refraction of 1.5. one side of the lens is flat and the
A block is projected up a frictionless inclined plane with initial speed v0 = 8.50 m/s. The angle of incline is ? = 27.7°. How far up the plane does it go
The plot below shows the acceleration of a mouse in a long, straight burrow as a function of time; the velocity and the x-coordinate of the mouse at time t=0 are both zero. find the velocity of the mouse at time t=2s
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