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What is the average momentum of a 70kg runner who covers 400 m in 50 s?
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Providing velocity is constant (say they are both running at 0.5ms-1).The concept of momentum applies in this problem. The sumo wrestler (assume 165kg) will have more momentum despite moving at the same speed.Momentum is given as the formula p = mvWhere p is momentum, m is mass and v is velocity.The momentum of the sumo wrestler is 160 x 0.5 = 80kgms-1The 70kg man has a momentum of:70 x 0.5 = 35kgms-1As you can see, the sumo wrestler has a momentum of 80kgms-1 as opposed to the man with a momentum of 35kgms-1.The person with the more momentum is therefore harder to tackle and more difficult to bring to a stop.
How much force is needed to lift 70kg box with an 2 minutes per seconds acceleration of the box?
momentum is mass x velocity (p=mv), and velocity is distance divided by time (d/t),so p=m(d/t)=(70kg)(400m/50s)=560 kgm/s================================Answer #2:If the questioner actually knew what he was talking about when he postedthe question, then the runner's average momentum is(70 kg) x (400 miles) x(1,609.344 meters/mile)/(50 seconds) = 9.012 x 105kg-m/secWe can't help but notice that in the question's frame of reference, the runner issteaming along at 28,800 miles per hour. This arouses our curiosity, but is notgermaine to the problem or to its solution, and we play the hand we are dealt.Our math and physics are bullet-proof, and we stand by them.
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Is it true that the attractive force of a 70kg person exerts on the Earth is smaller than the force the earth exerts on the person?
No, it is not. "For every action there is an equal and opposite reaction". The 70kg person is pulling just as hard on the Earth as the Earth is on the 70kg person, i.e. about 686 N.
How much should a15 year old be benching?
i am 15 at the moment and have been training since i was 12. i can now lift about 70kg but an average should be lifting about 25kg
