- #1
hackeract
- 8
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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?
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 don't think that's 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?
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 don't think that's 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?