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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?
To start a jump this insect can accelerate at 4m/s^2 over a distance of 2.0mm. What is the upward velocity it takes off at
An 800 keV photon is Compton scattered at an angle of 30 degrees. Calculate The energy of the scattered photon, The change in wavelength
A wire 2.80 m in length carries a current of 7.60 A in a region where a uniform magnetic field has a magnitude of 0.490 T. Calculate the magnitude of the magnetic force on the wire
Starting from rest, a disk rotates about its central axis with constant angular acceleration. In 5.0 s, it rotates 45 rad. What is the instantaneous angular velocity of the disk at the end of the 5.0 s
A student ate a Thanksgiving dinner that totaled 3000Cal . He wants to use up all that energy by lifting a 30-kg mass a distance of 1.0 m. How many times must he lift the mass
Two blocks of masses m1 = 2.00 kg and m2 = 3.60 kg are each released from rest at a height of h = 4.80 m on a frictionless track, Determine the velocity of each block just before the collision
Transcranial magnetic stimulation (TMS) is a noninvasive technique used to stimulate regions of the human brain. Determine the induced emf within a circle of tissue of radius 1.9 mm and that is perpendicular to the direction of the field
Standing on the surface of a small spherical moon whose radius is 6.85·104 m, What maximum height above the surface of the moon will the rock reach
Consider a system consisting of two long, concentric solenoids. The larger solenoid has current running in counter clockwise fashion. Find the magnetic field strength inbetween the solenoids. positive number if it is up
A photon with a wavelength of 3.90×10?13 m strikes a deuteron, splitting it into a proton and a neutron. Calculate the kinetic energy released in this interaction
Megan's mass is 28kg. She climbs the 4.8m ladder of a slide and reaches a velocity of 3.2m/s at the bottom of the slide. How much work was done by friction on Megan? Assume that air resistance is negligible.
Liquid nitrogen boils at 77.00 K. Would this experiment needs to be altered if we used water, which boils at 373 K? Why.
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