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3 years ago

What three forms of kinetic energy can a polyatomic molecule have?

1 answer:

5 0

When an object moves, it possesses kinetic energy. There are five types of kinetic energy - radiant, thermal, sound, electrical (light) and mechanical (motion). I would say that the three forms of kinetic energy a polyatomic molecule have are thermal, electrical and mechanical energy. Hope this answers the question. Have a nice day.

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A car travels at a steady 40.0 m/s around a horizontal curve of radius 200 m. What is the minimumcoefficient of static friction

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Answer:

c. 0.816

Explanation:

Let the mass of car be 'm' and coefficient of static friction be 'μ'.

Given:

Speed of the car (v) = 40.0 m/s

Radius of the curve (R) = 200 m

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$f=\mu mg$

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3 years ago

How to do this, i'm completely lost

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You need to figure out t4 to know the tension in the string.

Since the whole thing is not moving t1 + t2 + t3 = t4.

torque t = r * F * sinФ = distance from axis of rotation * force * sin (∡ between r and F)

t1 =3.2 * 44g
t2 = 7 * 49g
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The t4 also is given by:

t4 = r * T * sin Ф

r = 7
Ф = 32°
T: tension in the string

T = t4 / (r * sinФ)

T = t4 / (7 * sin(32°))

T = 1501,6 N

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