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Assume that when Dave pulls in the weights his moment of inertia becomes half of what it was initially. If his initial angular velocity, angular momentum, and rotational kinetic energy are ω, L, and K, what are they when he pulls the weights in?
An inventor designs an ice boat that is propelled by pumping a jet of water directly out the rear in a direction parallel to the ice. What is the velocity of the ice boat when the water is gone
In coming to a stop, a car leaves skid marks 91m long on the highway. Assume a deceleration of 7.5m/s2, compute approximately the speed of the car just before braking.
A large parallel plate capacitor has plate separation of 1.01 cm and plate area of 231 cm2. How much work is done on the capacitor as the plate separation is increased to 2.02 cm
In each cycle of its operation, a refrigerator removes 10 J of heat from the inside of the refrigerator and releases 38 J of heat into the room. How much work per cycle is needed to operate this refrigerator.
A cylindrical shell of radius 7cm and length 2.4 cm has charge uniformly distributed on its surface. The magnitude of the electric field at a point 19 cm radically outward from its axis, at the midpoint of the shell, is 36kN/C.
What is maximum light wavelength to be absorbed for creating electron-hole pairs in one type of Copper indium gallium (di)selenide
Two children setup a "telephone" by placing a long, slender aluminum (Y= 6.9 × 1010N/m2) rod that has a length of 6.1-m between their two houses. To communicate, a child taps a coded message on one end. How long do the sound waves take to reach th..
(A)What is the acceleration of gravity on the surface of the moon? (B) on the surface of Mars? The mass of Mars is 6.418 x10^23 kg and its radius is 3.38x10^6 m. Show work and formulas for credit
A circular disk has surface charge density 8.0nC/cm^2. What will the surface charge density be if the radius of the disk is doubled? Express your answer to two significant figures and include the appropriate units.
In the Bohr model of the hydrogen atom, an electron can orbit a proton (the nucleus) in a circular orbit of radius 1.32E-9 m. What is the electric potential at the electron's orbit due to the proton
A ball of mass 8.0 kg is suspended by two wires from a horizontal arm, which is attached to a vertical shaft, What are the tensions in wires 1 and 2
If you hear the other train's horn at 990 Hz, what is the actual frequency of the horn?
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