2 years ago

When potential energy ___________ , kinetic energy increases.

Physics

2 answers:

BARSIC [14]2 years ago

5 0

When potential energy <u>decreases</u>, kinetic energy increases.

Aleks04 [339]2 years ago

4 0

Answer:

I think it is decrease

correct if wrong

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I have a doubt on heat and temperature. I need help with this science question and here the question: The water in a lake just r

Volgvan

Answer:

you can't go ice skating on it because if it just reached the temp then you need to wait for about 2 hours

Explanation:

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2 years ago

Unbalanced forces cause a change in motion.<br><br> How do you know this?

ololo11 [35]

Answer:

This happens in two ways. If an object is at rest and an unbalanced force pushes or pulls the object, it will move. Unbalanced forces can also change the speed or direction of an object that is already in motion.

Explanation:

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2 years ago

The electric motor of a model train accelerates the train from rest to 0.685 m/s in 21.5 ms. The total mass of the train is 875

Natali [406]

Answer:

P=9.58 W

Explanation:

According to Newton's second law, and assuming friction force as zero:

$F_m=m.a\\F_m=0.875kg*a$

The acceleration is given by:

$a=\frac{\Delta v}{t}\\a=\frac{0.685m/s}{21.5*10^{-3}s}\\\\a=31.9m/s^2$

So the force exerted by the motor is:

$F_m=0.875kg*31.9m/s^2\\F_m=27.9N$

The work done by the motor is given by:

$W_m=F_m*d\\\\d=\frac{1}{2}*a*t^2\\d=\frac{1}{2}*31.9m/s^2*(21.5*10^{-3}s)^2\\\\d=7.37*10^{-3}m$

$W_m=27.9N*7.37*10^{-3}m\\W_m=0.206J$

And finally, the power is given by:

$P=\frac{W_m}{t}\\P=\frac{0.206J}{21.5*10^{-3}s}\\\\P=9.58W$

8 0

2 years ago

This is physics class, plzzz help ! 86.72 m to cm

Vaselesa [24]

Answer:

8672

Explanation:

multiply the length value by 100

5 0

2 years ago

HELP HELP HELP ME PLEASE!!!!!!!!!!!!

adoni [48]

The air would contract therefore the answer is the second choice.

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3 years ago