Why is it important for earth’s magnetic field that the inner core is hotter then the outer core?

A worker pushes a 200-N box (weight of box, you have to find mass) resting on a level floor with a force of 30 N. What is the ac

QveST [7]

For the problem we will apply the concepts related to Newton's second law. Recall that this is defined as the product between mass and acceleration, and that in special cases, when the acceleration is equivalent to the force of gravity, the force is equivalent to the weight of the person. From these relationships we will find the mass, and then the acceleration with the given force.

$F_w = mg$

Here,

$F_w$ = Force

m = Mass

g = Gravity

Replacing and rearranging we have that the mass is,

$m = \frac{F_w}{g} = \frac{200}{9.81}$

$m = 20.387kg$

Now using the value of the force, but solving for the acceleration with the previous value of the mass we have,

$F = 30N$

$a = \frac{F}{m}$

$a = \frac{30}{20.387}$

$a = 1.47m/s^2$

Therefore the acceleration of the box is $1.47m/s^2$

8 0

3 years ago

WHICH TYPES OF ENERGY ARE HAPPENING

Lady bird [3.3K]

Answer:

mecanichal energy

Explanation:

................

8 0

4 years ago

If a 370 KG missile is flying at a speed of 220 m/s , then what is it’s kinetic energy

lidiya [134]

Answer:

8954000 J

Explanation:

The formula to find kinetic energy is:

<em>Kinetic energy = </em> $\frac{1}{2}$ <em> × mass × (velocity)²</em>

So, Kinetic energy = $\frac{1}{2}$ × 370 × (220)²

Kinetic energy = 8954000 J

4 0

2 years ago

Why does the sky appears blue?

SashulF [63]

Explanation:

Sky appears blue because of Scattering.Blue light is scattered in all directions by the tiny molecules of air in Earth's atmosphere. Blue is scattered more than other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time.

3 0

4 years ago

Describe the nature of sunlight using the following: wavelength, electromagnetic spectrum, visible light, photons.

kogti [31]

Answer:

due to the effect of gravity begins thermonuclear fusion processes, in these processes energy is released in the form of electromagnetic radiation

Explanation:

The Sun is a star of great size, which due to the effect of gravity begins thermonuclear fusion processes, in these processes energy is released in the form of electromagnetic radiation.

This radiation crosses the different layers of the Sun and escapes from it in the form of light that is emitted throughout the radiation spectrum, due to the temperature reached by the Sun about 5500K the most likely radiation is around 5500 nm corresponding to the green- yellow of the visible spectrum, but the entire spectrum is emitted with different intensity according to Stefan's law

In quantum mechanics this spectrum can also be analyzed as the emission of particles called photons, where each one is characterized by an energy and has a moment equal to zero, the energy of these photons is related to their frequency by the Planck equation

E = h f

3 0

3 years ago