an elevator of mass M is suspended from a vertical cable. When the elevator is accelerating downward with an acceleration magnitude of 5.8 m/s^2, the tension in the cable is 3644N, what is the mass of the elevator?(adsbygoogle = window.adsbygoogle || []).push({});

I had a few ideas..

T - mg = ma

T = m(g + a)

T/(g+ a) = m

Or i was thinking 3644N = Kg/M/s^2, you could just divide by 5.8 and the M/s^2 cancel out, leaving M which is = 628kg

..

what is the moons orbital speed?

Mass Earth 6 x 10^24 kg

Mass Moon 7.36 x 10^22 kg

Radius Earth 6400km

Radius Moon 1740km

Mooms orbital radius 3.84 x 10^8

for this i was thinking a = v²/r, and plug that into Newton's second law.. but i dont think thats right

A 24kg mass sits on a frictionless plane. Calculate the force required to give an acceleration of 5 m/s^2 up the plane

(mass = 24kg, Angle=37)

and

a speeding motorist passes a stopped police car. At the moment he passes the police car begins accelerating at a constant rate of 4.4 m/s². the motorist unaware that he is being chased, continues at constant speed until the police car catches him 12s later. how fast was the motorist going?

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# Homework Help: Different types of Questions not many though

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