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4 years ago

Where could convection currents form? Check all that apply.

Physics

2 answers:

melamori03 [73]4 years ago

8 0

Answer:

in a freshwater lake

in the atmosphere

Explanation:

Here we know that convection currents are defined as the flow of medium molecules due to the density difference as we know that less density molecules always lie on the top of the fluid due to upthrust of heavy molecules.

So here when temperature is changing in different layers of fluids then due to temperature gradient there is flow of fluid molecules along with thermal energy

This flow of thermal energy along with the molecules is known as convection current.

So here correct answer would be

in a freshwater lake

in the atmosphere

BabaBlast [244]4 years ago

4 0

I believe the correct answers from the choices listed above are options 2nd and 3rd. Convection currents form in liquids and gases so it should be <span>in a freshwater lake and in the atmosphere.</span>

Hope this answers the question. Have a nice day.

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An 56 kg sled is being pulled across the snow, at constant speed,by a horizontal force of 15 N, find the coefficient of kinetic

Stolb23 [73]

Answer:

The coefficient of kinetic friction = 0.026

Explanation:

An 56 kg sled is being pulled across the snow, at constant speed,by a horizontal force of 15 N.

Here we have to note that the weight is pulled at a constant speed . This means that the net force acting on the weight is zero.

The external force acting on the body is in the forward direction and the friction acts in the backward direction.

Friction increases as the mass of the body increases.

Friction = $u_{k}\times m \times g$

We now equate this to the external force of 15 N.

15 = $u_{k} \times 56 \times 10$

$u_{k}$ = $\frac{15}{560}$

$u_{k}$ = 0.026

The coefficient of kinetic friction = 0.026

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4 years ago

A bag of firewood has a mass of 10.0 kilograms and a weight of

lorasvet [3.4K]

90 kilograms hope this helps

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3 years ago

Is an artificial hip replacement technology?

Makovka662 [10]

Answer: yes

Explanation: because its artificial piece specifically designed to help that certain area

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3 years ago

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According to Newton's thirdlaw, every action has an equal and opposite reaction. When a comb is charged and held near small piec

NeTakaya

Answer:

Due to the fact that the comb is in terms of mass bigger than pieces of paper

Explanation:

In terms of mass, the comb is way too bigger than the piece of paper so it is virtually impossible for it to move towards the pieces of paper

According to Newton third law action and reaction are equal and opposite

Mathematically

P=m*v

Where

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m=mass of the body

V= velocity of the body

Now since the comb has a greater mass it will not move to the paper, else the paper must have to move to it.

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3 years ago

Two people with a combined mass of 127 kg hop into an old car with worn-out shock absorbers. This causes the springs to compress

Elena-2011 [213]

Answer:

Total load = 2999.126 kg

Explanation:

Let the spring constant of the shock absorber be k.

We know that the force applied on a spring is directly proportional to elongated length and the constant of proportionality is called spring constant.

Thus

Force, F = kx

where,

x = elongation = 9.1 cm 0.091 m

mass of the people, m = 127 kg

F = weight of the people = mg = 127 x 9.8 = 1244.6 N

substituting these values in the first equation,

1244.6 = k x 0.091

thus, k = 13,676.923 N/m

Now we know that the time period, T of an oscillating spring with a load of mass m is

$T = 2\pi \sqrt{\frac{m}{k} }$

$\frac{m}{k} = \frac{T^{2} }{4\pi ^{2} }$

thus,

$m = k\frac{T^{2} }{4\pi ^{2}}$

T = 1.66s

substituting these values in the equation,

$m =13,676.923\frac{1.66^{2} }{4\pi ^{2} }$

m = 2999.126 kg

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3 years ago