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A flywheel for energy storage in a hybrid gasoline-electric car is a ring-shaped rotor of mass 49 kg, designed to rotate at 30000 rpm. At that speed it stores 10 MJ of energy (equivalent to about a cup of gasoline).
a) What is the ring's diameter?
b) If the flywheel can supply power at the rate of 25 kW, how long will it take for its stored energy to be exhausted?
The pressure gauge on a tank registers the gauge pressure, Determine the mass of oxygen that has been withdrawn from the tank when the pressure reading is 22.4 atm
a 1.99 kg block slides on a rough, horizonatl surface. The block hits a spring with a speed 2.16 m/s, what is the force constant of the spring
A conducting bar of length script l moves to the right on two frictionless rails, Explain the origin of the energy being delivered to the resistor
A river flows due south with a speed of 2.00m/s{\rm m}/{\rm s} . A man steers a motorboat across the river, Find the horizontal component of the book's velocity
A dollar bill is about 15.5 cm long. If ten trillion dollar bills were laid end to end around the Earth's equator, how many times would they encircle the planet
A planar electromagnetic wave is propagating in the +x direction. What is the Poynting vector at the point P at that instant
A uniform 20.0 chain 2.00 long supports a 55.0 chandelier in a large public building. Find the tension in the middle link of the chain
An artificial earth satellite has a circular orbit of radius 7.10 multiply.gif 106 m in an equatorial plane. Compute the (constant) speed of the satellite
In downhill speed skiing a skier is retarded by both the air drag force on the body and the kinetic frictional force on the skis. Suppose the slope angle is ? = 32.5°, What is the terminal speed
A train travels due south at 60 m/s. It reverses its direction and travels due north at 60 m/s. What is the change in velocity of the train
A certain digital camera having a lens with focal length 7.50cm focuses on an object 1.90m tall that is 4.70m from the lens. How far must the lens be from the photocells
A fishing line is attached to a bober that has diameter of 5.00 cm and mass of 5.00g. A lead weight is attached to line. What is mass of lead
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