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In the javelin throw at a track-and-field event, the javelin is launched at a speed of 28 m/s at anangle of 32° above the horizontal. As the javelin travels upward, its velocity points above the horizontal at an angle that decreases as time passes. How much time is required for the angleto be reduced from 32° at launch to 22°?
At the surface of the Earth, the Sun delivers an estimated 1.43 kW/m2 of energy. Suppose sunlight hits a 16.3 m by 33.3 m roof at an angle of 90.0°. Estimate the total power incident on the roof
A certain toaster has a heating element made of Nichrome resistance wire, What is the final temperature of the heating element
The drive propeller of a ship starts from rest and accelerates at 3.00 x 10-3 rad/s2 for 2.70 x 103 s. Find the total angular displacement of the propeller
An automobile having a mass of 1,000 kg is driven into a brick wall in a safety test. The bumper behaves like a spring with constant 5.55 106 N/m, What was the speed of the car before impact
A car approaches the top of a hill that is shaped like a vertical circle with a radius of 51.6 m. What is the fastest speed that the car can go over the hill
An object is placed to the left of a lens, and a real image is formed to the right of the lens. How far from the lens is the object
A pulsed proton beam is fireat a target each last 45.0ns and there 3.00 X 10^9 protons in each pulse, What is the average pressure on the beam spot during the pulse if the protons are absorbed by the target
A curve of radius 50 m is banked for the design speed of 100 km/h. If the coefficient of static friction is 0.60 (wet pavement), at what range of speeds can a car safely create the curve.
A meter stick is found to balance at the 49.7-cm mark when placed on a fulcrum. What is the mass of the meter stick
A moving particle encounters an external electric field that decreases its kinetic energy from 9820 eVto 7470 eV as the particle moves fromposition A to position B. The electric potentialat A is -51.0 V, and the electric potential at B is +28.9 V.
Penny's eraser was accidentally dropped out of the window and falls into the street. The window is 9 m above the road. What is the speed of the eraser when it hits the floor
A 66-kg skier starts from rest at the top of a 1200-m-long trail which drops a total of 260m from top to bottom. How much energy is dissipated by friction
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