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Tom's rocket ship is moving away from Kathy at 0.75c. He fires a laser beam in the backward direction, toward Kathy. According to Galilean relativity. How fast does the laser beam move relative to Kathy, assuming that Tom observes the beam to move away from him at speed c? How fast according to Einstein's relativity? Why?
a decorative light fixture in an elevator consists of a 2.0 kg light suspended by a cable from the ceiling of the
A gardener pushes a 20kg lawnmower whose handle is tilted up 37degrees above horizontal. The lawnmower's coefficient of rolling friction is 0.20. How much power does the gardener have to supply to push the lawnmower at a constant speed of 1.4m/s ? As..
a plane electromagnetic wave has an energy flux of 711 wm2. a flat rectangular surface of dimensions 100 cm times 24 cm
A spoon is raised 21.0 centimeter above a table. find the gravitational potential energy associated with the spoon
a .30kg puck initially at rest on a frictionless surface is struck by a .2kg puck that is initially moving along the
people who do chin-ups raise their chin just over a bar the chinning bar supporting themselves only by their arms.
Consider two antennas separated by 14.0 m that radiate in phase at 85 MHz. Areceiver placed 150 m from both antennas measures an intensity/0. The receiver is moved so that it is2.2 m closer to one antenna than the other.
What is mass of the block of ice
A 48dB sound wave strikes an eardrum whose area is 4.2×10?5m^2. How much energy is absorbed by the eardrum per second
What is the maximum height, y2, if the object is thrown with a speed of v2 = 1.99v1 from the surface of Jupiter's moon Io? The acceleration due to gravity on Io is g2 = 1.79 m/s2. Give the reply as a multiple of y1.
A 2.00 kilogram cart is moving at a rate of 4.0 meters per second when a continual force of 16.0 newtons begins to act on the cart in the direction of motion. What is the speed of the cart after 7.0 seconds?
What are the conditions necessary for life to take root, evolve, and flourish? Where might we find these outside of Earth? The solar system?
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