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3 years ago

What is the momentum of an object with mass 8 kg and velocity 5 m/s

Physics

1 answer:

Slav-nsk [51]3 years ago

6 0

Momentum = (mass) x (speed)

Momentum = (8 kg) x (5 m/s)

Momentum = 40 kg-m/s

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A tin can collapses if all air inside it is taken out why

Veseljchak [2.6K]

That only happens when the tin can is IN air.

In the familiar, comfy part of Earth's atmosphere where we live, the normal pressure of air is around 14.6 pounds on every square inch of everything. That's a big part of the reason why we're built with bodies that generate that same amount of pressure on the INSIDE pressing OUT. That way, we always have the same pressure pushing in both directions, so we know that we won't get crushed or blow up like balloons.

But we have to be careful with our bodies or other things when they're in places where the atmospheric pressure on the outside is NOT normal.

-- When a deep-sea diver goes hundreds of feet down in the ocean, and the pressure of the water is much GREATER than normal air.

-- When an astronaut has to go outside ... where there's NO air ... and fix something on the International Space Station.

When the pressure on the outside becomes very unusual, we have to wear special suits to protect our bodies from the unusual conditions.

The tin can in the story is a lot like our bodies. As long as it has air inside and air outside, the pressure is the same in both directions, so there's no particular force trying to deform the can. But ...

-- If you seal the can with the air inside it, take the can into a vacuum chamber, and pump the air out of the vacuum chamber, then the can only has pressure inside. It'll expand, and eventually spring a little hole in the metal, and all the air inside will blow out.

-- If you take all the air OUT of the can (so the can is REALLY 'empty'), then the pressure on it is all from the outside. In that situation, the can simply collapses, because there's nothing inside to provide pressure in the outward direction.

One more little thing to think about:

When you want some toothpaste to come drizzling out of the tube onto your brush, what do you do ? Do you perhaps squeeze the tube, and increase the pressure on the outside ?

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3 years ago

Britain and France signed an entente and became the

V125BC [204]

Allied Forces. they became the allies.

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3 years ago

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What happens to the free energy released as electrons are passed from photosystem II to photosystem I through a series of electr

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It is used to establish and maintain a proton gradient.

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3 years ago

How much heat is required to convert 0.3 kilogram of ice at 0°C to water at the same temperature?

Over [174]

The amount of heat required to melt a substance at its melting point is given by
 $Q=m L_f$ 
where m is the mass of the substance and Lf is its latent heat of fusion. During the phase change, the temperature of the substance does not change, and all the energy given to the substance is used to break the bonds between the molecules. In this problem, we have a block of ice of mass m=0.3 kg. The specific latent heat of ice is 334 kJ/kg: therefore, the amount of heat required to melt it is given by
 $Q=mL_f =(0.3 kg)(334 kJ/kg)=100.3 kJ$ 
So, the correct answer is A) 100375 J

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3 years ago

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What are 2 examples of Newton's second law in everyday life?

IRISSAK [1]

Answer:

kicking ball and throwing stone

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2 years ago

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