Ask question

Ask question

All categories

3 years ago

11

Why do things become hot or cold? Relate to Thermal Energy and The Law of Conservation of Energy

1 answer:

Mekhanik [1.2K]3 years ago

4 0

<u>Answer:</u>

Things become hot and cold because of the transfer of energy.

<u>Explanation:</u>

The energy possessed by an object or system is called thermal energy and heat is the flow of this energy. While the law of conversation of energy states that energy is not destroyed or created, it just transfers from one object to another.

When a hot object is placed in normal conditions, it transfers heat to the environment until both are at the same temperature and heat transfers from the environment to the cold objects placed in normal conditions.

You might be interested in

Describe the phases of the moon along with a picture.

Alex787 [66]

Answer:

The eight Moon phases:

Waxing Crescent: In the Northern Hemisphere, we see the waxing crescent phase as a thin crescent of light on the right. First Quarter: We see the first quarter phase as a half moon. Waxing Gibbous: The waxing gibbous phase is between a half moon and full moon.

The phases of the Moon are the different ways the Moon looks from Earth over about a month. As the Moon orbits around the Earth, the half of the Moon that faces the Sun will be lit up. The different shapes of the lit portion of the Moon that can be seen from Earth are known as phases of the Moon.

<h2>The 8 phases (in order) are:</h2>

New moon.
Waxing Crescent.
First Quarter.
Waxing Gibbous.
Full moon.
Waning Gibbous.
Third Quarter.
Waning Crescent.

Explanation:

Hope it is helpful....

5 0

3 years ago

Read 2 more answers

A car with a constant velocity of 22 m/s is driven for 6.8 s. How far did it travel? (v =∆ d/∆t)

Genrish500 [490]

Answer:

C. 150 m

Explanation:

22 m/s x 6.8 = 149.6

3 0

3 years ago

Lightning can sometimes occur on hot and humid summer evenings when there are no thunderstorms.

mart [117]

Answer:

(B) False

Explanation:

No, it is not possible to have thunder without lightning. Thunder is a direct result of lightning.

4 0

4 years ago

Read 2 more answers

You want to build a search light. The search light is to have an outgoing parallel beam. You have a small, very bright light (a

andrew11 [14]

Answer:

1 m

Explanation:

Given

The mirror is a concave mirror.

Radius of curvature = 2 m

Now, for a parallel beam after reflection occurs, the object should be placed at the focus of the mirror.

We know, focal length = radius of curvature / 2

= 2 / 2

= 1

Thus the focal length is 1 m.

Hence the object should be placed at 1 m from the concave mirror for parallel beam reflection.

3 0

3 years ago

A Thomson's gazelle can run at very high speeds, but its acceleration is relatively modest. A reasonable model for the sprint of

777dan777 [17]

Answer:

The correct answer will be:

(a) 27.3 m/s

(b) 3.8 s

Explanation:

According to the question:

Acceleration,

$a= 4.2 \ m/s^2$

Time,

$t = 6.5 \ s$

(a)

The gazelles top speed will be:

⇒ $V_{max} = at$

$=4.2\times 6.5$

$=27.3 \ m/s$

or,

$= 27 \ m/s$

(b)

As we know,

s = 30 m

Now,

⇒ $s = \frac{1}{2} at^2$

or,

⇒ $t=\sqrt{\frac{2s}{a} }$

On putting the given values, we get

$=\sqrt{\frac{2\times 30}{4.2} }$

$=\sqrt{\frac{60}{4.2} }$

$=3.78 \ s$

or,

$=3.8 \ s$

5 0

3 years ago