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3 years ago

Which of Newton's Three Laws Applies? Law 1, 2, or 3?

Physics

1 answer:

frozen [14]3 years ago

7 0

Answer:

1. Newton's first law

2.Newton's second law

3.Newton's third law

Explanation:

1. Newton's first law stated, In an inertial frame of reference, an object either remains at rest or continues to move at a constant velocity, unless acted upon by a force... this is base of the concept of inertia.

2. Newton's second law stated, In an inertial frame of reference, the vector sum of the forces F on an object is equal to the mass m of that object multiplied by the acceleration a of the object: F = ma, or in easier words, F is directly proportional to a.

3. Newton's third law stated, When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body., In this case, the Normal Are opposite with gravititional force.

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A body weighs less inside water

Ipatiy [6.2K]

Answer:

Body weighs lesser in water because of the upward force (buoyant force) which acts on our body thereby reducing our actual weight. This is our apparent weight.

Explanation:

hope it helps

7 0

2 years ago

A fuse in an electric circuit is a wire that is designed to melt, and thereby open the circuit, if the current exceeds a predete

arlik [135]

Answer:

0.0389 cm

Explanation:

The current density in a conductive wire is given by

$J=\frac{I}{A}$

where

I is the current

A is the cross-sectional area of the wire

In this problem, we know that:

- The fuse melts when the current density reaches a value of

$J=520 A/cm^2$

- The maximum limit of the current in the wire must be

I = 0.62 A

Therefore, we can find the cross-sectional area that the wire should have:

$A=\frac{I}{J}=\frac{0.62}{520}=1.19\cdot 10^{-3} cm^2$

We know that the cross-sectional area can be written as

$A=\pi \frac{d^2}{4}$

where d is the diameter of the wire.

Re-arranging the equation, we find the diameter of the wire:

$d=\sqrt{\frac{4A}{\pi}}=\sqrt{\frac{4(1.19\cdot 10^{-3})}{\pi}}=0.0389 cm$

3 0

3 years ago

Area is found by multiplying the length of a surface times the width. If a floor measures 5.28 m2, how many square centimeters d

Scilla [17]

62,500 cm^2.........

8 0

3 years ago

Give two examples of energy being transformed from one type to another

GaryK [48]

Answer:

Explanation:

For example, an ice cube has heat energy and so does a glass of lemonade. If you put the ice in the lemonade, the lemonade (which is warmer) will transfer some of its heat energy to the ice.

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3 years ago

Why is hydroelectric power considered to be an example of multiple transfers of energy?

Radda [10]

Hydroelectric power is considered to be an example of multiple transfers of energy because potential energy when the water is in the reservoir turns into kinetic energy making the water move to the dam and then the dam moves into the turbine turning it to electric energy.

7 0

3 years ago