2 years ago

Please answer I need help

Physics

1 answer:

Drupady [299]2 years ago

4 0

Answer:

I have attached a picture of me explaining the answers in written format. Hope this helps, thank you !!

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A steel drill making 180 rpm is used to drill a hole in a block of steel. The mass of the steel block and the drill is 180 g. If

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Answer:

a) 37.8 W

b) 2 Nm

Explanation:

180 g = 0.18 kg

We can also convert 180 revolution per minute to standard angular velocity unit knowing that each revolution is 2π and 1 minute equals to 60 seconds

180 rpm = 180*2π/60 = 18.85 rad/s

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Since the entire mechanical work is used up in producing heat, we can conclude that the rate of work is also 37.8 J/s, or 37.8 W

The torque T required to drill can be calculated using the work equation

$E = T\theta$

$\dot{E} = T\dot{\theta} = T\omega$

$T = \frac{\dot{E}}{\omega} = \frac{37.8}{18.85} = 2 Nm$

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Suppose you are in an elevator. As the elevator starts upward, its speed will increase. During this time when the elevator is mo

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Answer:increased

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It is given that elevator speed is increasing while moving upward i.e.its acceleration is increasing .

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a=acceleration of Elevator

thus you feel as if your weight is increased.

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