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A swimmer bounces straight up from a diving board and falls feet first into a pool. She starts with a velocity of 4.00 m/s, and her takeoff point is 1.30 m above the pool.
(a) How long are her feet in the air? (s)
(b) What is her highest point above the board? (m)
(c) What is her velocity when her feet hit the water? (m/s)
A piece of Nichrome wire has a radius of 6.2 x 10-4 m. It is used in a laboratory to make a heater that dissipates 4.40×102 W of power when connected to a voltage source of 130 V. estimate the necessary length of wire
A singly ionized helium atom (He+) has only one electron in orbit about the nucleus. What is the radius of the ion
Consider the mass spectrometer shown schematically in the figure below. The electric field between the plates of the velocity selector is 5400 V/m, Calculate the radius of the path for a singly charged ion having a mass m = 3.29 10-26 kg
A silicon solar cell looks like a battery with a 0.33Vterminal voltage. What is the solar cell's efficiency-that is, what percentage of the energy incident on the cell is converted to electric energy
A wall in a house contains a single window. The window consists of a single pane of glass whose area is 0.14 m2 and whose thickness is 8 millimeter. compute what is the percentage lost by the window
A 54 kg ice skater is moving at 39 m/s when she grabs theloose end of a rope, the opposite end of which is tied to apole. What is the ratio of this force to her weight
An engine with an output of 267.0 W has an efficiency of 39.0 %. It works at 9.00 cycles/s. How much heat is rejected each cycle
A car is traveling along a road, and its engine is turning over with an angular velocity of +190 rad/s. What would have been the angular displacement if the angular velocity had been equal to its final value of +300 rad/s during the entire 7.0-s in..
A 40 kg girl sits on a turn table with a moment of inertia of 1200.The turn table completes 1 revolution in six seconds. Calculate the angular speed of the girl
A motorcycle has a constant speed of 28.1 m/s as it passes over the top of a hill whose radius of curvature is 130 m. Find the magnitude of the centripetal force
A Michelson interferometer uses light from glowing hydrogen at 486.1 nm. As you move one mirror, 530 bright fringes pass a fixed point in the viewer. How far did the mirror move.
Watch the video titled "Groundwater Contamination" (4 min 35 sec) under the Water Pollution terms section of the Science Corner. You can also view the video athttps://www.youtube.com/watch?v=5xs1jLlbztE. Next, explain the main reasons why some ground..
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