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The frequencies of the spectral lines in light from a distant galaxy are found to be two-thirds as great as those of the same lines in light from nearby stars. Find the recession speed of the distant galaxy.
Two Skaters collide and hold on to each other on a frictionless floor. find direction of the velocity of these skaters after the collision
You throw a 21.6 N rock vertically into the air from ground level. You observe that when it is a height 14.4m above the ground, What is its speed just as it left the ground
A telescope has an objective with a refractive power of 1.50 diopters and an eyepiece with a refractive power of 270 diopters
A man at point A directs his rowboat due north toward point B, straight across a river of width 100 m. While the man is crossing the river, what is his velocity relative to the shore
A typical lightbulb in your house is rated 200 W, which means that the bulb dissipates 200 W when connected to a DC voltage of 110 V. (a) What is the current through the lightbulb? (b) If the voltage is reduced to 55 V, what is the dissipated powe..
A man doing a slow push-up is approximately in static equilibrium. His body is horizontal, with his weight of 757 N supported by his hands and feet, how far from the shoulders is the man's center of gravity
A Carnot engine with a hot-reservoir temperature of 360 has the same thermal efficiency. What is the cold-reservoir temperature in C?
A steel beam that is 7.00m long weighs 330N. It rests on two supports, 3.00m apart, with equal amounts of beam extending from each end. Suki, who weighs 505 N, stands on the beam in the center and then walks toward one end. How close to the end can s..
After a tornado, a 0.55-g straw was found embedded 2.8 cm into the trunk of a tree. If the average force exerted on the straw by the tree was 70 N, what was speed of the straw when it hit the tree .
An object travels in a circle of radius 2.0 m. At time t = 0, the object has a velocity of 10 m/s and it slows uniformly to a stop in 30s. a. Draw a circle and indicate the velocity vector and the acceleration vector at some time between 0 and 30s.
to measure the mass of an object, the object and a fixed 1.00 kg mass are held at rest on a frictionless surface with a llight spring under compression between the two objects. what is the mass of the object
a 2. kg ball moving to the right with a speed of 25m/s collides with a 15. kg ball going in the same direction with the speed of 20 m/s. What is the speed of the second ball after collision if it travels in the same direction as before
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