3 years ago

How does friction affect motion? (Please explain in an easy way and no plagiarism please)

1 answer:

5 0

Friction causes resistance against a moving object. It can cause an object to slow down, or stop when there’s enough friction…. I hope this helps

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If the net force on an object stays the same but the mass of the object is doubled, what will happen to the

Sergio [31]

Answer:

The acceleration of the object decreases I think

Explanation:

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3 years ago

In one cycle a heat engine absorbs 450 J from a high-temperature reservoir and expels 290 J to a low-temperature reservoir. If t

Vitek1552 [10]

Answer:

So the ratio will be $\frac{T_L}{T_H}=-0.171$

Explanation:

We have given heat engine absorbs 450 joule from high temperature reservoir

So $Q=450j$

As the heat engine expels 290 j

So work done W = 290 J

We know that efficiency $\eta =\frac{W}{Q}=\frac{290}{450}=0.6444$

It is given that efficiency of the engine only 55 % of Carnot engine

So efficiency of Carnot engine $=\frac{0.6444}{0.55}=1.171$

Efficiency of Carnot engine is $\eta =1-\frac{T_L}{T_H}$

$1.171 =1-\frac{T_L}{T_H}$

$\frac{T_L}{T_H}=-0.171$

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3 years ago

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What are physical properties?

Blizzard [7]

I'm pretty sure that the answer is C

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4 years ago

A man is crossing a river of width 100 m on a motorboat. The velocity of the motor boat is 4 m/s eastward and the velocity of th

Airida [17]

By the Pythagorean theorem we get $3^2+4^2=5^2$ . Thus the resultant velocity will be 5 m/s.

However there is a typo in the choices. It should take 25 seconds to cross the river, not 20 seconds, since the boat actually travels 125 meters due to the water current, and 125/5 = 25 seconds.

Alternatively you can calculate the eastward component of travel and get 100 / 4 = 25 seconds.

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3 years ago

In many cases, large trucks move more slowly up hills than small cars. What do you think is the reason for this

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T&hey are heavier I believe and need a bigger engine to make it
hope i helped
Have a great day

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3 years ago

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