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2 years ago

Explain how evaporation cools a liquid

1 answer:

8 0

When evaporation occurs liquid absorbs heat from the surroundings to get converted to its vapour form as a result, there is an overall decrease in the heat leading to cooling of the liquid.

Hope that this was helpful :)

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_____ have a nearly circular orbit.

bezimeni [28]

B. Asteroids have a nearly circular orbit.

4 0

3 years ago

Decide whether each statement describes mass or weight.

vova2212 [387]

Mass is measured in kilograms.
Mass does not change when gravity changes.
Mass is the amount of matter in something.

<u>Weight</u>

Before I answer, we have to know weight formula. Weight = mass × acceleration due to gravity.
Therefore, weight is measured in Newtons.
Weight changes when gravity changes. This is because weight is dependent on acceleration due to gravity.
Weight is a gravitational force.

Hope you could understand.

If you have any query, feel free to ask.

8 0

3 years ago

A block of mass 9.2kg rests on a slope an angle of 26.9∘ relative to the horizontal. What is the size of the contact force norma

Olegator [25]

Answer:

80.4 N

Explanation:

As the block is at rest on the slope, it means that all the forces acting on it are balanced.

We are only interested in the forces that act on the block along the direction perpendicular to the slope. Along this direction, we have two forces acting on the block:

- The normal reaction N (contact force), upward

- The component of the weight of the block, $mg cos \theta$ , downward, where m is the mass of the block, g is the gravitational acceleration and $\theta$ is the angle of the incline

Since the block is in equilibrium along this direction, the two forces must balance each other, so they must be equal in magnitude:

$N=mg cos \theta$

And by substituting the numbers into the equation, we find the size of the contact force normal to the slope:

$N=(9.2 kg)(9.8 m/s^2)(cos 26.9^{\circ})=80.4 N$

6 0

3 years ago

Pulsars "blink" because they _____.

rosijanka [135]

A pulsar, or a pulsing star, is a highly magnetized neutron star that emits a beam of electromagnetic radiation. So they blink when they are rotating because the beam of radiation they emit can only be seen when it is facing the Earth.
Hope this helps.

4 0

3 years ago

If the top circuit has an oscillation frequency of 1000 Hz, the frequency of the bottom circuit is:_______.

kiruha [24]

Answer:

1410 Hz

Explanation:

Capacitance is reduced by 2, so the angular frequency will increase by a factor of $\sqrt{2}$ .

5 0

3 years ago

Explain how evaporation cools a liquid​

Explain how evaporation cools a liquid