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Suppose 60kW is to be transmitted over two 0.150? lines
Estimate how much power is saved if the voltage is stepped up from 200V to 2000V and then down again, rather than simply transmitting at 200V . Assume the transformers are each 99% efficient.
A 36 g ball is shot from a spring gun whose spring has a force constant of 529 N/m. The spring can be compressed 4 cm. How high will the ball go if the gun is aimed vertically
A 6.4g lead bullet traveling at 460m/s is stopped by a large tree. If half the kinetic energy of the bullet is transformed into internal energy and remains with the bullet while the other half is transmitted to the tree, what is the increase in te..
Condensation occurs on a bathroom window at a rate of 0.5 kg per hour. If the bathroom air is at 26°C and fully saturated with water vapour, compute approximately, the rate of heat transfer onto the window surface if the inside surface is maintain..
A satellite moves in a circular orbit around the Earth at a speed of 5680 m/s. Determine the period of the satellite's orbit
The total volume of the column of water in the neck is 0.200 m^3. Illustrate what is the magnitude of the force exerted by the water on the bottom of the container?
To focus a camera on objects at different distances, the converging lens is moved toward or away from the film, Over what distance must the lens be movable
A 15 kg block is accelerated at 2.0 m/s2 up a frictionless plane inclined at 5.0° to the horizontal, with the speed increasing from 10 m/s to 24 m/s. What is the change in the block's mechanical energy
An atom has only two levels, a ground state with energy -25.0 eV, What wavelength photon is required for stimulated emission of an electron in the excited state
Consider a solid sphere, mass = 4.0 kg, that is spinning with an angular velocity of 23 radians/second.The diameter of the sphere is 0.20 meters
How many J of energy must be removed when 156 g of steam, at a temperature of 175.0 °C, is cooled and frozen into 156 g of ice at 0 °C.
If an electric field strength greater than 3.88E+6 N/C causes the air to break down and conduct charge (lightning), what is the maximum charge the cloud can hold
A circular coil enclosing an area of 96 cm2 is made of 199 turns of copper wire. The wire making up the coil has resistance of 3.0 , and the ends of the wire are linked to form a closed circuit.
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