We can use the textbook results for head-on elastic collisions to analyze the recoil of the earth when a ball bounces off a wall embedded in the earth. suppose a professional baseball pitcher hurls a baseball ( 155 grams = 0.155 kg) with a speed of 103 miles per hour ( 45.3 m/s) at a wall, and the ball bounces back with little loss of kinetic energy. (a) what is the recoil speed of the earth (m = 6x10^24 kg)? v earth = m/s (b) calculate the recoil kinetic energy of the earth and compare to the kinetic energy of the baseball. the earth gets lots of momentum (twice the momentum of the baseball) but very little kinetic energy. k earth = j k baseball = j
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An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. but she does have devices to measure distance and time accurately. she knows her own mass is 77.4 kg , but she is unsure of the mass of a large gas canister in the airless rocket. when this canister is approaching her at 3.50 m/s , she pushes against it, which slows it down to 1.30 m/s (but does not reverse it) and gives her a speed of 2.60 m/s . what is the mass of the canister?
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We can use the textbook results for head-on elastic collisions to analyze the recoil of the earth wh...
Mathematics, 08.04.2021 05:00
Mathematics, 08.04.2021 05:00
Mathematics, 08.04.2021 05:00