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quester [9]
3 years ago
14

The best example of heat transfer by convection is when

Physics
1 answer:
aalyn [17]3 years ago
6 0

A).  Heat travels from the sun to the soil by radiation.

B).  A ceiling fan moving air around doesn't say anything about heat.

C).  It's not <em>heat</em> rising from a chimney.  It's heated air.
Whenever you see a heated substance rising through some of
the same substance that's cooler, you're seeing convection.


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Karla Ayala pulls a sled on an icy road (dangerous!). Because of Karla's pull, the tension force is 151 N, and the rope makes a
skelet666 [1.2K]

Answer:

W = 1418.9 J = 1.418 KJ

Explanation:

In order to find the work done by the pull force applied by Karla, we need to can use the formula of work done. This formula tells us that work done on a body is the product of the distance covered by the object with the component of force applied in the direction of that displacement:

W = F.d

W = Fd Cosθ

where,

W = Work Done = ?

F = Force = 151 N

d = distance covered = 10 m

θ = Angle with horizontal = 20°

Therefore,

W = (151 N)(10 m) Cos 20°

<u>W = 1418.9 J = 1.418 KJ</u>

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3 years ago
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galben [10]

Answer:

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1) Choose the answer choice that BEST completes the following sentence.
Lena [83]

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What is the speed of the animal from 0-20s? <br><br> 50 m/s<br> 0.4 m/s<br> 20 m/s<br> 2.5 m/s
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Answer:

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