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How fast must an electron move to have a kinetic energy equal to the energy of a photon of wavelength (l = 600 nm)?(The energy of the electron is assumed to benon-relativistic)
A child sits still on a swing that is supported by two chains. Each chain makes a 15.0° angle with the vertical. The child's mass is 25.0 kg. What is the tension in each chain? (Ignore the mass of the seat and chains.)
according to the bureau of labor statistics the average hourly wage in the us was 22.57 in may 2010. a random sample
Consider two masses ( treat as point masses) of mass m=1.5 kg and m=2.5 kg held together by a massless rod of length 2a=2.0 m and free to pivot at the center of the rod.
Superman throws a 0.18 kg baseball at a speed of 0.932c. Find the following for the baseball.-rest energy, kinetic energy, total energy
A golf ball is released from rest from a height of 0.759 m above the ground and has a collision with the ground, What is the maximum height reached by this ball as it bounces back up after this collision
A chipmunk scampers about collecting in its cheeks safflower seeds that the birds dropped from the feeder hanging overhead. Initially the little creature is at position vector r1x = 2.45 m and r1y = -2.13 m. After filling up, it runs to the hole a..
A golden retriever is sitting in a park when it sees a squirrel. What is the magnitude of the dog's change in momentum
A 80-kg snow skier is being pulled up a 16 ° slope by a steel (Young's modulus 2.0 x 10^11 N/m2) cable. The cable has a cross-section area of 7.0 x 10^-5 m2. what is the original (unstretched) length of the cable
A ghost leaves a thin slime of ectoplasm (n=1.8) on a puddle of water (1.33). When looking down with light shining on the puddle, What is a possible thickness of the slime
A 1.35 block is attached to a spring with spring constant 14. While the block is sitting at rest, a student hits it with a hammer and almost instantaneously gives it a speed of 50. What are The block's speed at the point where = 0.750 A.
question the mean diameters of x and y two planets in the same solar system are 6.4 x 103 km and 1.2 x 104 km
An airplane is flying with the velocity of 85.0 m/s at an angle of 20.0 degrees above the horizontal. When the plane is a distance 107 m directly above the dog that is standing on level ground, a suitcase drops out of the luggage compartment. How far..
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