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3 years ago

The process by which hot and cold air are transferred in the atmosphere is

Physics

2 answers:

Nuetrik [128]3 years ago

6 0

That process is convection.

Alex777 [14]3 years ago

4 0

<u>Answer</u>

convection

<u>Explanation</u>

Heat is a form of energy. It can be transferred from one region to the other.

In solids heat is transferred by a process called conduction.

In vacuum heat transfer is by a process called radiation.

In fluids (gases and liquids) heat is transferred by a process known as convection.

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A ball is thrown horizontally with a velocity of 12 m/s. How

miskamm [114]

Answer:

is there a picture of it

7 0

3 years ago

Seat belts and air bags save lives by reducing the forces exerted on the driver and passengers in an automobile collision. Cars

gizmo_the_mogwai [7]

Answer:

The net force is 1350 kN

Solution:

As per the question:

Mass of man, m = 60 kg

Initial speed of the car, v = 15 m/s

Final speed of the car, v' = 0 m/s

Distance covered by the person before coming to rest, d = 5 mm = $5\times 10^{- 3}\ m$

By using the third eqn of motion:

$v'^{2} = v^{2} + 2ad$

$0 = 15^{2} + 2\times a\times 5\times 10^{- 3}$

$a = - 22500\ m/s^{2}$

Thus the force on the person can be given by:

F = ma = $60\times 22500 = 1350\ kN$

7 0

4 years ago

How does population stimulate social change?

Dmitry_Shevchenko [17]

Answer:

A change in the size of the population may bring about changes in the culture. For example, food brought to this country by immigrant groups have become common in many American kitchens. Population increases and decreases affect the economy. For example, by increasing the demand for goods and services, a growing population may increase employment and stimulate the economy. An increase in the general population also means that there are more people occupying the same amount of space, which creates more crowded conditions. In addition, the larger population brings increased demand for energy, food, housing, schools, stores, and transportation. People also bring about changes simply by moving from one place to another. Migrations of people within a country can cause social changes, such as the loss of regional distinction within the country. Social and cultural changes also result from changes in the average age of a population. When fewer people are having babies, for example, there is less need for schools, recreation centers, and other services geared toward children.

8 0

4 years ago

Use this technique to find a formula for the intensity I of a sound, in terms of the sound level β and the reference intensity I

mezya [45]

The problem is basically asking us to find a way to find the sound intensity I, in terms dependent on the sound level and the reference intensity $I_0$ .For this purpose we can start from the unit used in the scale logarithmic decibel, that is

$\beta = 10log_{10}\frac{I}{I_0}$

Where

I = Acoustic intensity on the linear scale

$I_0 =$ Hearing threshold

Using the logarithmic properties of the exponents the above expression can be described as:

$(\frac{I}{I_0})^{10} = 10^{\beta}$

$I = I_0 10^{\frac{\beta}{10}} \righarrow$ that is the expression or technique to find the intensity of sound.

8 0

3 years ago

A 1.0-kg block moving to the right at speed 3.0 m/s collides with an identical block also moving to the right at a speed 1.0 m/s

____ [38]

Answer:

Speed of both blocks after collision is 2 m/s

Explanation:

It is given that,

Mass of both blocks, m₁ = m₂ = 1 kg

Velocity of first block, u₁ = 3 m/s

Velocity of other block, u₂ = 1 m/s

Since, both blocks stick after collision. So, it is a case of inelastic collision. The momentum remains conserved while the kinetic energy energy gets reduced after the collision. Let v is the common velocity of both blocks. Using the conservation of momentum as :

$m_1u_1+m_2u_2=(m_1+m_2)v$

$v=\dfrac{m_1u_1+m_2u_2}{(m_1+m_2)}$

$v=\dfrac{1\ kg\times 3\ m/s+1\ kg\times 1\ m/s}{2\ kg}$

v = 2 m/s

Hence, their speed after collision is 2 m/s.

7 0

4 years ago