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4 years ago

According to Newton's 3rd law, the force on the (smaller) moon due to the (larger) earth is?

1 answer:

8 0

According to Newton's 3rd law, the force on the (smaller) moon due to the (larger) earth is "equal in magnitude to, and in the opposite direction from, the force on the earth due to the moon".

Option: C

Explanation:

A force is a push or pull acting on an entity as a consequence of its contact with a particular object. Such two phenomena are called forces of action and reaction, and are the origin of the third law of motion by Newton.

This law states the force of the moon on earth is equal and opposite to the force of earth on the moon. The enticing force operating between a satellite orbiting the earth in a circular path allows the object to accelerate towards earth, but since it maintains its circular orbit, it never gets closer to earth.

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A frog is at the bottom of a 17-foot well. Each time the frog leaps, it moves up 3 feet. If the frog has not reached the top of

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Answer:

The frog takes 8 jumps to reach top of well

Explanation:

Given data

Frog at bottom=17 foot

Each time frog leaps 3 feet

Frog has not reached the top of the well, then the frog slides back 1 foot

To Find

Total number of leaps the frog needed to escape from well

Solution

in 1 jump distance jumped=3+(-1)

=2 feet

=2×1 feet

The "-1" is because the frog goes back

Now After 2 jumps the distance jumped as:

Distance Jumped=2+2

Distance Jumped=2*2

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Similarly after 7 jumps

Distance Jumped=2+2+......+2

Distance Jumped=2*7

=14 feet

Now after 8th jump the frog climbs but doesnot slide back as it is reached to the top of well.

Distance Jumped=(Distance Jumped after 7 jumps)+3

=14+3

=17 feet

The frog takes 8 jumps to reach top of well

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3 years ago

A person whose weight is 5.20 3 102 N is being pulled up vertically by a rope from the bottom of a cave that is 35.1 m deep. The

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Answer:

It is given that the weight of the person is 102 N

We have the force that shall be needed to being the man out in minimum amount of time shall correspond to the maximum tension that can be developed

Thus using Newton's second law we obtain the acceleration that the man shall attain

$\sum F_{ext}=m\overrightarrow{a}\\\\T-W=ma\\\\\therefore a=\frac{T_{max}-W}{\frac{W}{g}}\\\\a_{max}=\frac{569-102}{\frac{102}{9.81}}=44.9m/s^{2}$

Now using second equation of kinematics to obtain time 't' we get

$t=\sqrt{\frac{2s}{g}}\\\\t=\sqrt{\frac{2\times 35.1}{44.9}}=1.25secs$

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