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4 years ago

What do the particles do in thermal energy to make the temperature rise or fall?

1 answer:

3 0

Well, the particles gain energy from heat which makes the substance hotter.The more energy the particles gain, the hotter the substance.

When the substance is cooled the particles start to lose energy.The colder area that the substance is in, the more energy the particles lose.

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The first few hundred million years of the solar system's history were the time of the __________, during which Earth suffered m

azamat

Answer:

heavy bombardment

Explanation:

5 0

3 years ago

A girl moves quickly to the center of a spinning merry-go-round, traveling along the radius of the merry-go-round. Which of the

DochEvi [55]

Answer:

The angular speed of the system increases.

The moment of inertia of the system decreases.

Explanation:

As we know that the girl is going towards the center of the circle so here the moment of inertia of the girl is given as

$I = mr^2$

here we know that

r = position of the girl from the center of the disc

now we know that the girl is moving towards the center so its distance will continuously decreasing

So the moment of inertia of the girl will decrease

Now we know that that with respect to the center of the disc there is no torque on the disc + girl system

So here we can use angular momentum conservation

So we have

$I\omega = constant$

since moment of inertia is decreasing for the system

so angular speed will increase

3 0

4 years ago

How does comets differ from a asteroids

Temka [501]

Comets are made of icy material and asteroids are rocky bodies and are denser than. Hope this helps.

8 0

4 years ago

A charge of 8.4 × 10–4 C moves at an angle of 35° to a magnetic field that has a field strength of 6.7 × 10–3 T. If the magnetic

larisa86 [58]

Answer:

The charge is moving with the velocity of $1.1\times10^{4}\ m/s$ .

Explanation:

Given that,

Charge $q =8.4\times10^{-4}\ C$

Angle = 35°

Magnetic field strength $B=6.7\times10^{-3}\ T$

Magnetic force $F=3.5\times10^{-2}\ N$

We need to calculate the velocity.

The Lorentz force exerted by the magnetic field on a moving charge.

The magnetic force is defined as:

$F = qvB\sin\theta$

$v = \dfrac{F}{qB\sin\theta}$

Where,

F = Magnetic force

q = charge

B = Magnetic field strength

v = velocity

Put the value into the formula

$v =\dfrac{3.5\times10^{-2}}{8.4\times10^{-4}\times6.7\times10^{-3}\times\sin35^{\circ}}$

$v =\dfrac{3.5\times10^{-2}}{8.4\times10^{-4}\times6.7\times10^{-3}\times0.57}$

$v = 10910.36\ m/s$

$v = 1.1\times10^{4}\ m/s$

Hence, The charge is moving with the velocity of $1.1\times10^{4}\ m/s$ .

4 0

3 years ago

Star A and star B appear equally bright in the sky. Star A is twice as far away from Earth as star B. How do the luminosities of

DerKrebs [107]

Answer:

The answer to the question is

The luminosity of stars A is four times that of star B

Explanation:

Flux (F) produced by a source of light is directly proportional to the brightness or Luminosity (L), and varies inversely to its distance d, that is $F \alpha \frac{L}{d^2}$

Therefore if the two stars present the same flux then we have

$\frac{L_1}{d_1^2} = \frac{L_2}{(2d_1)^2}$ then crossing out like terms gives $\frac{L_1}{1} = \frac{L_2}{2^2}$ or 4·L₁ = L₂

The luminosity of star A is 4 times the that of star B

7 0

3 years ago