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erastovalidia [21]
2 years ago
13

What are the Disadvantages of Friction?

Physics
1 answer:
d1i1m1o1n [39]2 years ago
8 0

Answer:

1 friction produces heat which damages the moving part of a machine

2 a lot of energy is wasted In overcoming the friction before an object starts moving

3 friction produces wear and tear on the contacting surfaces

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What part of the electromagnetic spectrum do you think is most important and why?
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Explain how surface waves can have characteristics of both longitudinal waves and transverse waves. Please use 3 content related
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Answer: Surface waves can have characteristics of both longitudinal and transverse waves in the following way; The motion of the surface waves is up and down which is perpendicular to the direction of the wave. This is similar to the motion of transverse waves whereas the the motion of longitudinal.

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3 years ago
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
Whitepunk [10]

Answer:

r=0.41m

Explanation:

Torque is defined as the cross product between the position vector ( the lever arm vector connecting the origin to the point of force application) and the force vector.

\tau=r\times F

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

\tau=rFsin\theta

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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