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3 years ago

What is the main cause of convection: a.pressure b. density c. weight d. altitude

Physics

1 answer:

densk [106]3 years ago

7 0

Answer:

density

Explanation:

Convection currents are the result of differential heating. Lighter (less dense), warm material rises while heavier (more dense) cool material sinks. It is this movement that creates circulation patterns known as convection currents in the atmosphere, in water, and in the mantle of Earth.

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An object accelerates from rest with a constant acceleration of 2 m/s2. How far will it have moved after 9s?

maw [93]

As per the question the, the initial velocity of object [u] =0

The acceleration of the block $[a]=2\ m/s^2$

The time taken by the object[t] = 9 s.

We are asked to calculate the distance travelled by the object in that time.

As per equation of kinematics we know that-

$s=\ ut+\frac{1}{2} at^2$

Here s is the distance travelled by the object.

$=0*9+\frac{1}{2} 2*[9]^2\ m$

$=81\ m$ [ans]

5 0

4 years ago

When traveling at top speed, a roller coaster train with a mass of12,000 kg has a velocity of 30 m/s. The kinetic energy of the

uysha [10]

Answer:

<em>The kinetic energy of the train at top speed is 5,400,000 J</em>

Explanation:

<u>Kinetic Energy </u>

It's the capacity that an object has to do work in virtue of its velocity. If we use UI units for the mass and velocity, the kinetic energy is expressed in Joules, or Nw.m or $Kg.m^2/sec^2$ . It can be computed with the formula

$\displaystyle K=\frac{mv^2}{2}$

The roller coaster train has a mass of 12,000 kg and a velocity of 30 m/s. Replacing those values in the formula, we have:

$\displaystyle K=\frac{12,000\ 30^2}{2}$

$\displaystyle K=\frac{12,000\ 900}{2}$

$\displaystyle K=5,400,000\ J$

6 0

4 years ago

Read 2 more answers

Simpson drives his car with an average velocity of 48.0 km/h to the east. How long will it take him to drive 144 km on a straigh

Lorico [155]

Answer:

The time save by Simpson is 25.8 minutes.

Explanation:

Given that,

Velocity of the car, v = 48 km/h

Distance covered by the car, d = 144 km

Let t is the time taken by the car. Speed of an object is given by distance covered per unit time. It is given by :

$v=\dfrac{d}{t}$

$t=\dfrac{d}{v}$

$t=\dfrac{144\ km}{48\ km/h}$

t = 3 hours

If the velocity is increased to 56 km/h to the east. Time taken is given by :

$t'=\dfrac{144\ km}{56\ km/h}$

t' = 2.57 seconds

The time save by Simpson increasing his average velocity is given by :

$\Delta t=t-t'$

$\Delta t=3-2.57$

$\Delta t=0.43\ hours$

$\Delta t=25.8\ min$

So, the time save by Simpson is 25.8 minutes. Hence, this is the required solution.

5 0

4 years ago

Describe what physical meaning is attributed to ψ 2

NNADVOKAT [17]

In quantum mechanics, $\psi^2$ the basic wave function has no physical meaning or significance. However, $|\psi|^2$ represents the probability distribution of particle in a given space.

Probability $\propto$ $|\psi|^2$

So when you will put a position and a time in $\psi^2$ function, it will give you the probability of finding the particle at that particular position and at the given time.

6 0

3 years ago

Select the correct answer.

skelet666 [1.2K]

Answer:

B is the best answer for the question

6 0

3 years ago

Read 2 more answers