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3 years ago

10

What is the name of the person that help people at the gym?

2 answers:

tankabanditka [31]3 years ago

7 0

Question: what is the name of the person that help people at the gym?

Answer: a trainer

Explanation: they go around and help people with there exercise and take care of the equipment and tell you how to get in shape

question answered by

(jacemorris04)

frozen [14]3 years ago

5 0

That is called a physical trainer or a fitness coach. Hope I helped!

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3 years ago

A railroad car moves under a grain elevator at a constant speed of 3.20 m/s. Grain drops into the car at the rate of 240 kg/min.

dedylja [7]

Answer:

F = 768 N

Explanation:

It is given that,

Speed of the elevator, v = 3.2 m/s

Grain drops into the car at the rate of 240 kg/min, $\dfrac{dm}{dt}=240\ kg/min = 4\ kg/s$

We need to find the magnitude of force needed to keep the car moving constant speed. The relation between the momentum and the force is given by :

$F=\dfrac{dp}{dt}$

$F=m\dfrac{dv}{dt}+v\dfrac{dm}{dt}$

Since, the speed is constant,

$F=m\dfrac{dv}{dt}$

$F=v\dfrac{dm}{dt}$

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F = 768 N

So, the magnitude of force need to keep the car is 768 N. Hence, this is the required solution.

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