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A doughnut contains about 335 Calories. (Note: These are "food" Calories.) After eating this doughnut, you decide to compensate by taking the stairs instead of using the elevator. If each stair has a height of 19 cm, how many stairs must you climb to compensate for the doughnut? Assume all the energy in the doughnut can be converted to mechanical energy. (Take 75 kg as the mass of a typical person.)
A 461.1N child and a 114N child sit on either end of a 2.9m long seesaw. suppose a 280N child sits .196m from the 461.4N child. how far from the pivot must a 218N child sit to maintain rotational equilibrium?
A .4 kg ball has a velocity of 25 m/s, what is the kinetic energy of the ball & how much work would be required to stop the ball
A proton that has a mass m and is moving at 390 m/s in the + direction undergoes a head-on elastic collision with a stationary oxygen nucleus of mass 16m
A conducting spherical shell of inner radius b and outer radius c is concentric with a small metal sphere of radius a
The drawing shows a collision between two puckson an air-hockey table. Puck A has a mass of 0.0190 kg and ismoving along the x axis with a velocity of +4.63 m/s. It makes acollision with puck B, which has a mass of 0.0380 kg and isinitially at res..
A softball pitcher throws a ball straight upward as hard as she can. According to your stopwatch, What is the maximum height reached by the ball
A large punch bowl holds 3.00kg of lemonade (which is essentially water) at 25.0C. A 5.80×10^?2kg- ice cube at -10.0C is placed in the lemonade a)What is the final temperature of the system? Ignore any heat exchange with the bowl or the surroundin..
You drop 470 g of solid ice at ?35°C into a bucket of water (1,200 g) at 45°C. Find the final temperature of the system
The horizontal constircted pipe, can be used to meausre flow velocitites in an imcompressible fluid. Find the speed of the fluid near the right hand
In a head-on collision, a car stops in 0.19s from a speed of 26m/s The driver has a mass of 63kg and is, fortunately, tightly strapped into his seat. What force is applied to the driver by his seat belt during that fraction of a second
a 200-g block is pressed against a spring of force constant 1.40 knm until the block compresses the spring 10.0 cm. the
An artificial satellite circles Earth in a circular orbit at a location where the acceleration due to gravity is 9.00 m/s2. Determine the orbital period of the satellite
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