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A world-class sprinter can burst out of the blocks to essentiallytop speed (of about 11.5 m/s) in the first 15.0 m of the race. Whatis the average acceleration f the sprinter, and how long does it take her to reach that speed?
A 76-kg man is at rest on ice skates. A 0.24-kg ball is thrown to him. The ball is moving horizontally at 26 m/s just before the man catches it. How fast is the man moving just after he catches the ball
A 0.075 kg arrow is fired horizontally. The bowstring exerts an average force of 65 N on the arrow over a distance of 0.9 m. With what speed does the arrow leave the bow
A 3800-kg open railroad car coasts along with a constant speed of 8.60 m/s on a level track. what is the speed of the car after 90.0 min
heres a basketball problem a 80.2 kg basketball player is running in the positive direction at 7.4 ms. she is met
A 42-kg girl is standing on a 125-kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. What is her velocity relative to the ice surface
A hurricane-force wind of 220 blows across the face of a storefront window. Estimate the force on the 2.2 3.5 window due to the difference in air pressure
A car with a mass of 1000kg is traveling with a velocity of12m/s.The friction due t air resistance is 750N. What is the magnitude of the force needed(bythe engine) to accelerate the car to 18.9m/s in 4.5s? What is the magnitude of the force needed to..
A 2.00 kg block is pushed against a spring with negligible mass and force constant k=400 N/m, compressing it 0.220m. When the block is released, it moves along a frictionless,
A laser peripheral iridotomy is a procedure for treating an eye condition known as narrow-angle glaucoma, in which pressure buildup in the eye can lead to loss of vision. How many photons does the laser deliver
Which of the following devices uses total internal reflection function?
an object floats in water with 55 of its volume submerged. what is its approximate density?a 450 kgm3b 550 kgm3c 1000
When a potential difference of 140V is applied to the plates of an air-filled parallel-plate capacitor the plates carry a surface charge density of 4.20E-10
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