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3 years ago

PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!!

Physics

2 answers:

Alexandra [31]3 years ago

7 0

Mechanical waves need material stuff to travel through.

They cannot travel through vacuum.

That's why we can't hear the explosions on the sun.

That's also why astronauts standing on the moon or working outside the Space Station have to use radio to talk to each other, even if they're only a few inches apart. There's no air between them, or any other material stuff. So sound can't travel between them.

Fiesta28 [93]3 years ago

4 0

They can travel through a medium

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A chain 72 meters long whose mass is 29 kilograms is hanging over the edge of a tall building and does not touch the ground. How

dangina [55]

Answer:

Work done required is 3567.2 J

Explanation:

Given :

Length of chain, l = 72 m

Mass of chain, M = 29 kg

Linear mass density of chain, μ = $\frac{Mass\ of\ chain }{Length\ of\ chain}$ = $\frac{29}{72}$ = 0.40 kg/m

Let x be the length of the chain which lift to the top of the building.

Work done required to lift the chain is equal to the potential energy of the chain.

W = ∫μg (72 - x ) dx

Here g is acceleration due to gravity.

The limit of integration is from 0 to 14.

W = μg ( 72x - x²/2)

Substitute 0.40 kg/m for μ, 9.8 m/s² for g and 14 m for x in the above equation.

W = $0.40\times9.8\times(72\times14\ - \frac{14^{2} }{2})$

W = 3567.2 J

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3 years ago

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3 years ago

Which action can be explained by physics ?

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3 years ago

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A student hangs a wood block from a spring. The student pulls the block downwards so the spring is stretched and holds the block

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4 years ago

North Dakota Electric Company estimates its demand trend line (in millions of kilowatt hours) to be: D = 75.0 + 0.45Q, whe

Alborosie

Answer:

The demand forecast for winter is 96.36 millions KWH

The demand forecast for spring is 145.08 millions KWH

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Explanation:

Given that,

The demand trend line is