What happens to most materials when they are heated?

Answers

Answer 1

Answer: Almost every substance known to modern science expands
when it melts, and continues to expand as it is heated. That is,
its volume increases.

A shocking exception to this rule is the substance Dihydrogen Monoxide.

This substance contracts when it changes from the solid phase
to the liquid phase, and its volume continues to decrease as the
liquid is heated for 4 more degrees Celsius above its freezing/melting
point.

The result is that this amazing substance is the only one known whose
solid form floats in its liquid form, and whose liquid form near freezing
temperature rises to the top of a pool of slightly warmer liquid.

The chemical formula for Dihydrogen Monoxide is: H₂O .
The pure form is colorless, odorless, tasteless, and non-toxic.
In addition to its occurrence in nature, it is also found in faucets,
sinks, and toilets in most homes.

Answer 2

Answer: Most materials expand when they are heated. If they are heated enough, they may change from solid to liquid, or from liquid to gaseous forms.

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Which statement about speed and/or velocity is true?Velocity has both speed and direction.

Speed is constant.

Speed has direction and velocity.

Speed is measured over time.

Answers

The statement about speed and/or velocity which is true is: Velocity has both speed and direction.

Velocity refers to the rate of change in displacement (distance) with time. Velocity is a vector quantity and this simply means that, it has both magnitude (speed) and direction.

Mathematically, velocity is given by the formula;

$Velocity = (Distance)/(Time)$

On a related note, speed is a scalar quantity because it has magnitude but no direction.

However, both speed and velocity are measured in meters per seconds.

In conclusion, the relationship between speed and velocity is that velocity has both speed and direction.

Answer:

Velocity has both speed and direction.

Explanation:

speed is a part of velocity

What is the period of a wave generated by anearthquake, if it has a wavelength of 500 meters and a
speed of 5,000 meters per second?

Answers

Answer:

Period T = 0.1 second

Explanation:

Given that the

wavelength = 500 meters

speed V = 5000 meters per second

The wave speed is the ratio of wavelength to period of the wave. That is,

V = λ/T

Where

V = wave speed (m/s)

λ = wavelength (m).

T = period (s)

Using the formula above gives

5000 = 500/T

Make T the subject of formula

T = 500/5000

T = 0.1 s

Determine the quantity of work done when a crane lifts a 100-N block from 2 m above the ground to 6 m above the ground. A.
100 J

B.
200 J

C.
400 J

D.
600 J

Answers

Answer:

C. 400 J

Explanation:

In physics, work is defined as

$W=F * \Delta d$

Where $W$ is the word done, $F$ is the force that move the object and $\Delta d$ is the change of the position of the object.

In this case, we have

$F= 100 \ N$

$\Delta d= 6m - 2m = 4m$ , remember that the difference refers to the actual subtraction between the final point and the initial point of the object.

Replacing these values, we have

$W= 100 \ N * 4m\nW=400 \ Joules$

Therefore, the right answer is C. The work done is 400 Joules

Answer:

400 J

Explanation:

I just took the test and can confirm this.

Which object below involves two energy transformations when used?a) A radio plugged into an electrical outlet

b) A toaster

c) A battery-operated remote control car

d) A blender