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DerKrebs [107]
3 years ago
15

A fireman is sliding down a fire pole. As he speeds up, he tightens his grip on the pole, thus increasing the vertical frictiona

l force that the poleexerts on the fireman. When this frictionalforce on his hands equals his weight, what happens tothe fireman
Physics
1 answer:
Andrei [34K]3 years ago
8 0

Answer:

The fireman will continue to descend, but with a constant speed.

Explanation:

In kinetic friction <em>(which is the case discussed here) </em>since the fireman is already in motion because of a certain force, once the frictional force matches the normal force, the fireman will stop accelerating and continue moving at a constant rate with the original speed he had. We will need a force greater than the normal force acting on the fireman to cause a deceleration.

We need to understand the difference between static friction and kinetic friction.

Static friction occurs in objects that are stationary, while kinetic friction occurs in objects that are already in motion.  

In static friction, when the frictional force matches the weight or normal force of the object, the object remains stationary.

While in kinetic friction, when the frictional force matches the normal force, the object will stop accelerating. This is the case of the fireman sliding down the pole as discussed above.

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Answer:

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3 years ago
A mother pats a child every time he throws a chocolate wrapper in the dustbin. This is an example of (A) Observational Learning
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vesna_86 [32]

Answer:

9.7\times 10^{-5} T

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Velocity =5\times 10^4i-2\times 10^4j

r=0.03i+0.05j

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v=\mid V\mid=\sqrt{(5\times 10^4)^2+(-2\times 10^{4})^2}=5.39\times 10^{2}

We know that

B=\frac{mv}{qr}

Where q=1.6\times 10^{-19} C

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Using the formula

B=\frac{1.67\times 10^{-27}\times 5.39\times 10^2}{1.6\times 10^{-19}\times 0.058}

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3 0
3 years ago
Which statements accurately describe the Doppler effect? Select three options.
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Answer:The answer is A,B and C

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6 0
3 years ago
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Answer:

C) Use a battery with more voltage.

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So when using a higher voltage battery, more current passes through the battery as resistance of the wire remains the same.

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2 years ago
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