2 years ago

I need help guys it’s very confusing

Physics

1 answer:

tangare [24]2 years ago

4 0

Well what are you comparing or try to pair together?

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How does heat transfer? (Think temperature)

yulyashka [42]

Answer:

The rate at which temperature changes is proportional to the rate at which heat is transferred.

Explanation:

The temperature of a sample changes more rapidly if heat is transferred at a high rate and less rapidly if heat is transferred at a low rate

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2 years ago

If the mass of a material is 114 grams and the volume of the material is 13 cm3, what would the density of the material be?

laila [671]

114/13=m/v=d
d=8.7692 g/cm^3

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2 years ago

The moon orbits Earth approximately once a month. <br><br> True<br><br> False

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Answer:true

Explanation:

It takes the moon approximately a month to complete an orbit round the earth

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3 years ago

Which of these galaxies is most likely to be oldest?

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a galaxy observed at a distance of 5 billion light-years

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1 year ago

A submarine is stranded on the bottom of the ocean with its hatch 21.0 m below the surface. calculate the force (in n) needed to

Tanzania [10]

Answer:

28,400 N

Explanation:

Let's start by calculating the pressure that acts on the upper surface of the hatch. It is given by the sum of the atmospheric pressure and the pressure due to the columb of water, which is given by Stevin's law:

$p_{top} = p_{atm} + \rho g h=1.013\cdot 10^5 Pa + (1000 kg/m^3)(9.8 m/s^2)(21.0 m)=3.071 \cdot 10^5 Pa$

On the lower part of the hatch, there is a pressure equal to

$p_{bot}=p_{atm}=1.013\cdot 10^5 Pa$

So, the net pressure acting on the hatch is

$p=p_{top}-p_{bot}=3.071 \cdot 10^5 Pa - 1.013\cdot 10^5 Pa=2.058 \cdot 10^5 Pa$

which acts from above.

The area of the hatch is given by:

$A=\pi r^2 = \pi (\frac{0.420 m}{2})^2=0.138 m^2$

So, the force needed to open the hatch from the inside is equal to the pressure multiplied by the area of the hatch:

$F=pA=(2.058\cdot 10^5 Pa)(0.138 m^2)=28,400 N$

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2 years ago