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Hitman42 [59]
3 years ago
14

How would you describe the appearance of the substance after the phase change?

Physics
1 answer:
Leona [35]3 years ago
4 0

Answer:

Substances can change phase—often because of a temperature change. At low temperatures, most substances are solid; as the temperature increases, they become liquid; at higher temperatures still, they become gaseous. The process of a solid becoming a liquid is called melting.

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if a torque of 55.0 N/m is required and the largest force that can be exerted by you is 135 N what is th e length of the lever a
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r=0.41m

Explanation:

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\tau=r\times F

Due to the definition of cross product, the magnitude of the torque is given by:

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Where \theta is the angle between the force and lever arm vectors. So, the length of the lever arm (r) is minimun when sin\theta is equal to one, solving for r:

r=\frac{\tau}{F}\\r=\frac{55\frac{N}{m}}{135N}\\r=0.41m

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