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Kepler's second law of planetary motion describes how a planet's speed can change as it orbits the sun. In one of two sentences, describe the locations in the planet's orbit when it speeds up and slows down
There are 2 spaceships, A and B, that approach the earth from opposite directions. Now according to an observer on spaceship A, she approaches the earth at 0.7c.
A pirate in a movie is carrying a chest (0.30 m X 0.30 m X 0.20 m) that is supposed to be filled with gold. To see how ridiculous this is, determine the weight (in newtons) of the gold. To judge how large this weight is, remember that 1 N = 0.22..
Lightning strikes a point on earth, delivering 20.0 C of charge from cloud to earth across a potential difference of 1.00 108 V. How much energy is delivered to the ground
Find the reactions at the supports and plot the shear-force and bending moment diagrams. Label the diagrams properly and provide values at all key points.
An irregularly shaped object 10 m long is placed with each end on ascale. If the scale on the right reads 74 N and the scale on the left reads 93 N, how far from the left is the center of gravity?
An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. What is the mass of this canister
In an experiment, a rectangular block with height h is allowed to float in two separate liquids. In the first liquid,which is water, it floats fully submerged. In the second liquid it floats with height h/5 above the liquid surface. What isthe relati..
Lily is sprinting in a 100 m dash. at he 80 m mark her velocity is 9.5 m/s. What is the velocity of the air relative to Lily
What is the phase angle in an RLC circuit with R = 9.8 kΩ, C = 1.7 µF, and L = 260mH? The generator supplies an rms voltage of 130V at a frequency of 65.0Hz
An aluminum cup of mass 200 g contains 800 g of water in thermal equlibrium at 80.0c. the combination of cup and water is cooled unformly so that temperature decreases by 1.50c per minute. at what rate is energy being removed by heat.
A string of length L vibrates at its fundamental frequency. The amplitude at a point ¼L from one end is 5.40 centimeter. Find the amplitude of each of the traveling waves that form this standing wave
After a plant or animal dies, its 14C content decreaseswith a half-life of 5730 years. what is the age of the ancient site
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