What is convection current

Answers

Answer 1

Answer: A convection current is a flow of a fluid or air due to heating andcooling of the fluid or air. And for that matter the IE: Hot air rises. Cold air falls.

Answer 2

Answer:

Answer:

A convection current is the flow of heat within a fluid.

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A sled with rider having a combined mass of 110 kg travels over the perfectly smooth icy hill shown in the accompanying figure. How far does the sled land from the foot of the cliff?

Answers

The sled land is "25.531 m" far from the foot of the cliff.

According to the question,

The velocity of the top = $V_t$

then,

→ $0.5 \ Vt^2-0.5 \ Vi^2 = -mgh$

→ $0.5 \ Vt^2 = 0.5 \ Vi^2- 9.8* 11$

→ $0.5 \ Vt^2 = 0.5 \ Vi^2- 107.8$

→ $=17.04 \ m/sec$

Now,

The projectile motion in horizontal direction,

→ $S_y = 11 = ut-0.5 \ gt^2$

$= 0-0.5* 9.8 \ t^2$

or,

→ $S_x = 17.04* 1.498$

$= 25.53 \ m$

Thus the above answer is the correct one.

Learn more:

brainly.com/question/13027204

Find the speed the sled has at the top of the hill from the law of conservation of mechanical energy. Equate the kinetic energy at the bottom of the hill to the kinetic plus potential energy at the top :

0.5mv₀² = 0.5mv² + mgh
v = √[v₀² - 2gh]
= √[(22.5m/s)² - (2 x 9.80m/s² x 11.0m)]
= 17.0m/s

From the time independent kinematics equation, find the vertical component of the sleds final velocity (note that the vertical component of the sleds initial velocity is zero) :

v² = v₀² + 2gΔy
= 0 + 2(-9.80m/s²)(-11.0m)
= -14.7m/s (select the neg root, because motion is downward)

With this you can find the time vertically which is the same horizontally :

v = v₀ + gt
t = (v - v₀) / g
= (-14.7m/s - 0) / -9.80m/s²
= 1.50s

Now, the horizontal distance is :

Δx = (v₀ + v)t / 2
= (17.0m/s + 17.0m/s)1.50s / 2
= 25.5m

tell me if you need more help :)

You step into an elevator on the 50th floor and it quickly accelerates downward. For a second, until steady speed is reached, __________. A.) your weight is unchanged but your mass decreases B.) your mass is unchanged but your weight decreases C.) neither your mass nor weight change but the gravitational force decreases D.) neither your mass nor weight change but your apparent weight decreases

Answers

Answer:

Mass and weight would stay the same. However, the normal force between the person and the ground becomes smaller, making the weight of the person appear smaller.

Explanation:

The mass of an object is an intrinsic property. The mass of the object stays the same regardless of the motion of the object or the forces acting on the object. As a result, when the elevator accelerates downwards, the mass of this person would stay the same.

The weight of an object refers to the gravitational force on this object.

The gravitational force on an object is the product of the mass $m$ and the strength $g$ of the gravitational field:

$(\text{weight}) = m\, g$ .

The gravitational field strength near the surface of the Earth is mostly uniform ( $g \approx 9.81\; {\rm N\cdot kg^(-1)}$ .) Since the mass of this person stays the same, the weight of this person would also stay the same.

When a person stands on level ground, forces on this person would include:

Weight, which points downward, and
Normal force from the ground, which points upward.

The net force on this person would be:

$(\text{net force}) = (\text{weight}) + (\text{normal force})$ .

Rearrange this equation to obtain an expression for normal force:

$(\text{normal force}) = (-(\text{weight})) + (\text{net force})$ .

When the person is not moving, acceleration of the person would be zero. By Newton's Laws of Motion, the net force on this person would also be zero.

In the equation above, the magnitude of the normal force would be equal to the magnitude of weight. It would appear that the normal force on the person is equal in magnitude to the weight of this person.

However, when the person accelerates in the vertical direction, the net force on the person will become non-zero in the vertical direction. Normal force would no longer be equal in magnitude to weight.

Specifically, when the person accelerates downward in this elevator, acceleration of this person would point downward. Net force on this person would also point downward.

In the equation $(\text{normal force}) = (-(\text{weight})) + (\text{net force})$ , $(\text{weight})$ also points downward. However, because of the negative sign $(-(\text{weight}))$ and $(\text{net force})$ would be in opposite directions.

Additionally, the magnitude of net force cannot exceed the magnitude of weight. As a result, the magnitude of the sum of these two vectors would be smaller than the magnitude of weight.

The normal force on this object is equal to the sum of these two vectors. As a result, the magnitude of normal force would also be smaller than the magnitude when the person isn't moving. It would appear as if the apparent weight of this person has become smaller than the original value.

How many gallons are in a cubic gallon?

Answers

There's no such thing as a "cubic gallon". A 'gallon' is already a unit of volume,
only without the word 'cubic' in it.

If you like to play with different units of measure, here are a few conversions:

1 gallon = 231 cubic inches
1 cubic foot = 1,728 cubic inches = about 7.4805 gallons

1 cubic meter = 1,000 liters = 1 million cubic centimeters = about 264.17 gallons

Which of the following describes gamma rays?short wavelength, high frequency
short wavelength, low frequency
long wavelength, high frequency
long wavelength, low frequency

Answers

Answer: short wavelength, high frequency

Explanation:

Gamma rays are highly energetic electromagnetic waves. High energy implies high frequency.

E = h ν

h is the Planck's constant, ν is the frequency.

For electromagnetic radiation, frequency is inversely proportional to wavelength. Thus, gamma rays have high frequency but short wavelength.

The frequency of gamma rays is greater than 10¹⁹ Hz and wavelength is less 10⁻¹² m.

A can cause a driver to take risky chances or make bad choices

Answers

-- loud radio
-- heavy rain
-- girl friend in the car
-- misguided sense of privilege or importance
-- misguided sense of immortality

An ultrasound wave vibrates 30,000 times per second. what is the frequency

Answers

"Hertz" is the unit of reciprocal time, "per second".

"30,000 per second" means "30,000 Hertz".

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