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The energy provided each hour with heat to the turbine in an electric power plant is 9.0x10^12 J. If 5.6x10^12 J of energy is exhausted each hour from the engine as heat, what is the efficiency of this heat engine?
the magnetic coils of a tokamak fusion reactor are in the shape of a toroid having an inner radius of 0.700 m and an
Heather and Jerry are standing on a bridge 60m above a river. How much time elapses between the first splash and the second splash
a river is 175 meters wide and has a current that is flowing at 4 meterssecond from the north to the south. a swimmer
The velocity vs. time curve of an object is an increasing straight line. What is the acceleration of the object
During a storm, a tree limb breaks off and comes to rest across a barbed wire fence at a point that is not in the middle between two fence posts. The limb exerts a downward force of 151 N on the wire.
A box of unknown mass begins at the base of a 30 degree ramp with an initial velocity of 10.0 m/s. calculate the maximum distance up the ramp which the box will reach
The magnetic field of the earth at a certain location is directed vertically downward and has a magnitude of 50.0 µT. FIND magnitude of the magnetic force the field exerts on the proton
Compute the edge length of a cube that has the same volume as a sphere of radius 5.0 cm. How much greater is the surface area of the cube than that of the sphere (in cm2)
A uniform disk with a mass of 840 g and radius 17.0 cm is rotating on frictionless bearings with an rotational speed of 18.0 Hz, What is the new rotational speed of the disk
Some clear food wraps can be tightly stretched over a container and folded down the sides and they will retain the tension and complete secure of the container. The food wraps stick. How do they do these.
A person with perfect pitch sits on a bus bench listening to the 445 Hz horn of an approaching car. If the person detects the frequency of 488 Hz, how fast is the car moving.
Suppose that a police car on the highway is moving to the right at 29 m/s, while a speeder is coming up from almost directly behind at a speed of 31 m/s, which wave has the greater frequency
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