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You are relaxing on the beach when your friend suddenly zooms by in an extremely fast powerboat. Suppose (unrealistically) that the powerboat moves at relativistic speeds. The instant the powerboat passes right in front of you, both you and your friend get the same idea to play "Ride of the Valkyries" on your respective stereo systems. Your recordings are identical. In your friend's frame, whose recording finishes first?
The bones of a saber-toothed tiger are found to have an activity per gram of carbon that is 14.5 % of what would be found in a similar live animal
A magnetic circuit consists of an iron core of a cross sectional area of 4cm^2 in which an air gap is cut in, where a flux density of 0.9T is required. There is a leakage factor of 1.2 and fringing increases the cross sectional area of the gap by ..
When Philippe Petit was in the middle of the wire between the World Trade Center Towers the wire depressed 1 ft. If during his 40 minutes of tricks the wire began to oscillate up and down from this equilibrium position by 6 inches, where is his ki..
Two masses m1 and m2, with m1
A sphere with radius 0.205m has density ? that decreases with distance r from the center of the sphere according to ?=3.25×103kg/m3?(9.25×103kg/m4)r, calculate the moment of inertia of the sphere for an axis along the diameter
A car is traveling along a straight road at a velocity of +39.4 m/s when its engine cuts out. Find the velocity of the car at the end of the initial 2.09-second interval
The Andromeda Galaxy is approximately 2.21 million light years away from Earth? find how long will it take to get to the Sun
a car moving with a speed of 15 ms is slowed to a speed of 5 ms without changing its direction of motion covering a
A 73cm long metal string under 35.0N tension has a linear mass density of 2.45x10^-4 kg/m. Find the frequencies of the first three harmonics
A 2.83-kg book slides 1.17 m along a level surface. The coefficient of kinetic friction between book and surface is0.41. Find the work done by friction
A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. Find the speed of the wagon after the rock is thrown
Two rocks are thrown off the edge of a cliff that is 15.0 m above the ground. The first rock is thrown upward, at a velocity of +12.0 m/s. The second is thrown downward, at a velocity of 12.0 m/s.
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