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When a 58-g tennis ball is served, it accelerates from rest to a speed of 44 m/s. The impact with the racket gives the ball a constant acceleration over a distance of 38 cm. What is the magnitude of the net force acting on the ball?
A freely falling object at Earth’s surface drops vertically 5 m in 1 s. Earth’s curvature “drops” 5 m for each 8-km tangent. Discuss how these two facts relate to the 8-km/s speed necessary to orbit Earth.
You see the boy next door trying to push a crate down the sidewalk. He can barely keep it moving, and his feet occasionally slip. Estimate the mass of the crate
A group of hikers hears an echo 5 s after shouting. If the temperature is 16.0°C, how far away is the mountain that reflected the sound wave.
The speed of light in polythene is 1.99 x 108 m/s. What is the index of refraction of polythene
A solid sphere of mass 0.524 kg rolls without slipping along a horizontal surface with a translational speed of 5.33 m/s. It comes to an incline that makes an angle of 31.7° with the horizontal surface. Ignoring energy losses due to friction, to what..
If the mass is suspended by a spring M = 200g, What is the value of the spring constant of the spring
A football player with a mass of 89 kg and a speed of 2.1 m/s collides head-on with a player from the opposing team whose mass is 120 kg. Find the speed of the second player
The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. What is the magnitude of the electric field within the cell membrane
An ac generator with a frequency of 29.4 Hz and an rms voltage of 12.0 V is connected to a 49.5-µF capacitor. What is the maximum current in this circuit?
A uniform solid disk with a mass of 45.00 kg and a radius of 0.393 m is free to rotate about a frictionless axle. Forces of 90.0 and 125 N are applied to the disk.
the football has a mass of .40kg and the quarterback that threw the ball accelerated it from rest to 25 m/s in a distance of .60m. what force did the player's hand exert on the ball
When catching a baseball, a catcher's glove moves by 8 cm along the line of motion of the ball. how much work is done by the ball
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