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4 years ago

Will mark brainly

Physics

1 answer:

Maurinko [17]4 years ago

8 0

Answer:

The statement that refers to convection is Warm air rises and takes heat with it; eventually it cools and sinks

Explanation:

There are in general three modes of heat transfer: conduction, convection and radiation.

In conduction, the heat transfers through contact
In convection, the heat transfers through density difference
In radiation, the heat transfers through wave motion

Consider first statement, 'Land and ocean absorb and re-emit heat from the sun'. Radiation is the only mode of heat transfer where there is no requirement for medium. The heat from sun to land and ocean has traveled by radiation. The process of re-emission also occurs in the same way.

Similarly in second statement the energy reflected of earth's atmosphere traveled by radiation and the last statement where sunlight travels through space without aid of fluids or solids refers to the process of radiation.

In third statement the warm air being less dense rises and takes heat with it; eventually it cools and thereby density increases which causes to sink. Here the movement of air is due to density difference, which concludes that this statement refers to convection

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When a boat is placed in liquid, two forces act on the boat. Gravity pulls the boat down with a force equal to the weight of the

wel

Answer:

the fraction of submerged volume is equal to the ratio of the densities of the body between the density of the fluid.

Explanation:

This is a fluid mechanics problem, where as the boat is in equilibrium with the pushing force we can write Newton's second law

B- W = 0

B = W

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we substitute

ρ g V = m g

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we can write the mass of the pot as a function of its density

ρ_body = m / V_body

m = ρ_body V_body

V_fluid / V_body = ρ_body / ρ _fluid 2

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The effect appears the pot as if it had a lower apparent weight

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4 years ago

Based on what you’ve learned from the raisin cake analogy, which two properties of distant galaxies do astronomers have to measu

Kisachek [45]

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4 years ago

Patrick is repairing the roof on his house. He uses a hammer having a mass of 1 kilogram. While working at the apex of the roof,

pav-90 [236]

Answer:

72 joules

Explanation:

The potential energy of that hammer is a function of its displacement against gravity. Considering that it fell with a velocity of 12 m/s, it was its displacement against gravity that gave it this velocity. It will continue to move until its displacement to gravity is zero.

since the body is in motion; it has converted its potential energy (mgh, m is mass, g is acceleration due to gravity, and h is the height) to kinetic energy (energy due to motion, 1/2mv^2; m = mass, v = velocity or speed)

therefore the potential energy is equal to kinetic energy

mgh = 1/2mv^2 = 1/2 *1kg* 12*12 = 72 joules.

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3 years ago

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3 years ago

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