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A power plant (heat engine) needs to produce 700 MW to supply the needs of its residents. If the hot reservoir is maintained at 540°C, and the waste heat is expelled to a nearby river at 30°C, what is the rate of heat needed from hot reservoir if the power plant runs at 70% of it's theoretical maximum?
Using the concept of quantum and photons, explain the difference between a 100 W and a 40 W light bulb if they both produce only green light.
If the solution contains a metal cation such as Ag+, the flow of electrons will reduce the silver ion, causing solid silver to plate onto the electrode.
A juniper-wood plank measuring 0.17 feet by 1 feet by 12 feet is totally submerged in water. Calculate the buoyant force acting on it
A block with a mass of m is resting on a 20 degree slope. The block has coefficients of friction 0.81 and 0.55 with the surface. What is the minimum mass that will stick and not slip
Nate the Skate was an avid physics student whose main non-physics interest in life was high-speed skateboarding. In particular, Nate would often don a protective suit of Bounce-Tex, which he invented, and after working up a high speed on his skate..
The opposite side of the beam begins to rise when the magnitude of the force reaches 3.1 ? 102 N. What is the beam's weight?
A block of mass m is attached to a spring (k) and released from rest when the block has been compressed a distance d. What is the maximum speed of the block?
A 400g rubber ball is dropped a vertical distance of 12m. It remains in contact by the pavement for .01 sec and rebounds to a height of 10m. What is the total change in momentum? What average force is exerted by the floor on the ball?
q1. a 5.00-g bullet is shot through a 0.96-kg wood block suspended on a string 2.70 m long. the center of mass of the
A small plastic ball of mass 9.34×10-3 kg and charge +0.144C are suspended from an insulating thread and hangs among the plates of a capacitor (see the drawing). The ball is in equilibrium, with the thread making an angle of 30.0o with respect to the..
A flywheel rotates at 7200 rev/min when the power is suddenly cut off. How many revolutions does the flywheel makes before coming to rest
A copper wire of length 25 cm is in a magnetic field of 0.20 T. Ifit has a mass of 10 g, what is the minimum current through the wire that would cause a magneticforce equal to its weight?
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