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A Machine Gun is attached to a railroad car that is free to roll on a frictionless track. If the railroad car of mass 62,500 kilogram is initially at rest, compute how many bullets of mass 25 gram would have to be fired at 250 m/s off the back to give the railroad car a forward speed of 0.5 m/s?
You would like to store 9.4J of energy in the magnetic field of a solenoid. What is the energy density (energy/volume) inside the solenoid
When a 32.0-V emf device is placed across two resistors in series, a current of 11.0 A is flowing in each of the resistors. When the same emf device is placed across the same two resistors in parallel, the current through the emf device is 56.0 A. Wh..
A car moving 65 mph suddenly breaks and stops after travelingfor 50m. Find the time it takes for the car to stop
The band gap of the semiconductor gallium arsenide (GaAs) is 1.43 eV , and the bandgap for the semicondcutor aluminum gallium arsenide (AlGaAs) is 2.06 eV. find the maximum wavelength absorbed by GaAs
Light enters a container of benzene at an angle of 43^\circto the normal; the refracted beammakes an angle of 27^\circ with the normal. Calculate the index of refraction of benzene.
Jerry is 57 kg and when he stands on a bathroom scale, the spring inside the scale compresses 0.41 mm. If the scale will be damaged if the force exceeds 60000 N, what is the maximum height Jerry can jump on the scale
A Van de Graa? generator has a potential di?erence of 2.35 MV between the belt and the outer shell. What minimum power is needed to drive the moving belt
A roller-coaster car moves 205 ft horizontally and then rises 133 ft at an angle of 30° above the horizontal. What is its displacement from its starting point
A person is standing at the edge of the water and looking out at the ocean (see figure). The height of the person's eyes above the water is h = 1.8 m, and the radius of the Earth is R = 6.38 x 106 m. (a) How far is it to the horizon? In other word..
a curve of radius 139 m is banked at an angle of 9deg. an 758-kg car negotiates the curve at 77 kmh without skidding.
A wheel that is rotating at 45 Rad/s is give an angular acceleration of 3 Rad/s (sqrd). Use gravity: 10 m/s, how long is the angular velocity of the wheel
A 237 g mass is connected to a light spring of force constant 3 N/m that is free to oscillate on a horizontal, frictionless track. What is the maximum acceleration of the mass
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