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A high-speed train is built to be 600 m long. The train is passing through a 500 m long tunnel.
a. At what speed, according to an observer on the ground, the train will be just completely covered by the tunnel at one instance.
b. According the passengers on the train, how long is the tunnel? Will the passengers ever see the train be completely enclosed by the tunnel?
A Carnot engine absorbs 4.65 x 103 J from the hot reservoir and expels 3.12 x 103 J to the cold reservoir during each engine cycle. what is the temperature of the hot reservoir
An iron rod is heated by a welder's torch. Initially it glows a dull red, then a brighter orange, and finally very bright white. Discuss this sequence in terms of black-body radiation.
Two wires are tied to the 500 sphere. The sphere revolves in a horiIzontal circle at a constant speed of 6.8.
A cannon fires a pumpkin at a 65 degree angle with an initial velocity of 15.0 m/s. What is the maximum height of the pumpkin
A converging lens with a focal length of 7 centimeter forms an image of a 3.80 millimeter tall real object that is to the left of the lens. Find where are the object and image located
an empty hollow metal sphere has a potential of 470 v with respect to ground defined to be at v 0 and has a charge of
Evaluate the net force required to launch object of mass, m, into orbit of Earth at a distance or radius of RE. Use g for gravitational force
A barge is in a rectangular lock on a freshwater river. The lock is 60.0 m long and 20.0 m wide, and the steel doors oneach end are closed. by what vertical distance does it change
A weightless ladder 7.0 meter long rests against a frictionless wall at an angle of 65 degree above the horizontal, Find what horizontal force at the bottom of the ladder is required to keep it from slipping
A 7.00 kilogram bowling ball collides head-on with a 2.00 kilogram bowling pin. determine what was the initial speed of the ball
Capacitors C1 = 8.0 μF and C2 = 2.0 μF are charged as a parallel combination across a 305 V battery. The capacitors are disconnected from the battery and from each other. They are then connected positive plate to negative plate and negative plate ..
Where does the bare (5) come from, in the spring equation. I know where the .5 comes from (1/2), I know where the 1.2 comes from (Spring force), I know where the .05 comes from (5 CM, right?) -- so where does the 5 come from, and why isn't the .05 cm..
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