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A windmill has an initial angular momentum of 8220 kg•m2/s. The wind picks up, and 5.71 sec later the windmill's angular momentum is 9190 kg•m2/s. Find the torque acting on the windmill, assuming it was constant during this time?
Heat Q flows spontaneously from a reservoir at 445 K into a reservoir at 265 K. Because of the spontaneous flow, 2620 J of energy is rendered unavailable for work when a Carnot engine operates between the reservoir at 265 K and a reservoir at 248 K. ..
After a completely inelastic collision, two objects of the same mass and same initial speed are found to move away together at 1/2 their initial speed
The weight of passengers on a roller coaster increases by 53% as the car goes through a dip with a 35m radius of curvature
35MW of power at 45kV (rms) arrives at a town from a generator via 5.0? transmission lines. Calculate the emf at the generator end of the lines
the current-density magnitude in a certain circular wire is j 2.60 times 1010 am4r2 where r is the radial distance out
question 1 the weight of passengers on a roller coaster increases by 51 as the car goes through a dip with a 37m radius
Two small plastic spheres each have a mass of 2.0 {\rm g}and a charge of-50.0{\rm{ {\rm nC}}}. They are placed2.0 {\rm cm}apart. By what factoris the electric force on a sphere larger than its weight?
At t = 0 a grinding wheel has an angular velocity of 25.0 rad/s. It has a constant angular acceleration of 21.0 rad/s2 until a circuit breaker trips at t = 1.81 s. What was its acceleration as it slowed down
Find the acceleration of gravity on the surface of Mercury and find the acceleration of gravity on the surface of Venus.
A rock is dropped off a bridge and hits the water below 3 s later. The rock is going 30 m/s before it hits the water. what is the height of the bridge above the water
a silver coin lies on the bottom of a clear lake 5.5 m deep. the coin is 4 cm in diameter. the index of refraction of
In the 1930’s acoustic detection systems able to detect anaircraft at a range of 40.0 km were developed in several countries.The aircraft engines generate a sound intensity level of 95.0 dB ata distance of 10.0 metres from the aircraft, what inten..
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