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3 years ago

Volume of water shrinks between__

Physics

2 answers:

Lena [83]3 years ago

8 0

Answer:

when liquid water is cooled it contracts like one would expect until a temperature of approximately 4 degrees Celsius is reached. After that it expands slightly until it reaches the freezing point and then when it freeze it expands by Approximately 9percent

lorasvet [3.4K]3 years ago

5 0

Answer:

When liquid water is cooled, it contracts like one would expect until a temperature of approximately 4 degrees Celsius is reached. After that, it expands slightly until it reaches the freezing point, and then when it freezes it expands by approximately 9%.

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What is analogy a powerful rhetorical device?

wolverine [178]

The other person who answered this is wrong btw

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3 years ago

Joe first focuses his attention (and his eyes) on the tree. The focal length of the cornea-lens system in his eye must be ______

kotykmax [81]

Answer: The focal length of the cornea-lens system in his eye must be LESS THAN the distance between the front and back of his eye.

Explanation:

The human eye the front part of the eye is the CORNEA. This is the tough white transparent part of the eye that helps in the refraction of light rays. While the backside of the eye is the RETINA. This is the part of the eye when images are focused.

When a normal eye is at rest, parallel rays from a distant object are focused on the retina. The ability of the eye - lens to focus points at different distances on the retina is known as accomodation. The adjustment of the eye lens to focus objects of varying distances is brought about by the ciliary muscles. The have the ability to change the shape of the eye which leads to change in focal length.

When a person with normal vision looks at a distant object at infinity, the lens brings parallel rays to focus on the retina. Thus, the furthest point which the eye can see distinctly is called the far point of the eye and it's infinity for a normal eye. But Joe was able to focus his eye on the tree, meaning that the tree was within his near point. This is the nearest point at which an object is clearly seen. Therefore, when the effective focal length of the cornea-lens system changes, it changes the location of the image of any object in one's field of view.

5 0

3 years ago

A sound wave can cause the particles in a medium to vibrate slowly or quickly what is this rate of vibration called?

stealth61 [152]

Answer:

FREQUENCY

Explanation:

3 0

3 years ago

Read 2 more answers

With two identical light bulbs and two identical batteries how would you arrange in order to get the maximum total power to the

Norma-Jean [14]

Answer:

The batteries would be connected in series while the bulbs would be connected in parallel

Explanation:

Power (W) = VI

where V = voltage, I = current and R = resistance

from V = IR , I = V/R

Power (W) now becomes = V (V/R) = $\frac{V^{2} }{R}$

Power (W) = $\frac{V^{2} }{R}$

from the above equation, power is directly dependent on voltage, hence the voltage has to be high for the power to be high and the power is also inversely dependent on the resistance (in this case the bulbs which act as the load)

We have to batteries, when batteries are connected in series the total voltage becomes the summation of the two voltages hence giving a higher voltage and when they are connected in parallel their voltage remains the same. Since we want to get higher voltage we will connect the two batteries in series.
we have two bulbs which are the resistance here, from the equation above the power is inversely dependent on the resistance so we would need its value to be minimal. When resistance is connected in series the resistance individual will be added to get the total resistance, hence the total resistance will be high but when the resistors are arranged in parallel you get the total resistance by applying the formula $\frac{R1R2}{R1+R2}$ which will give us a lower resistance. Hence we would connect the bulbs in parallel.

Take note that the power from this connection should not exceed the bulbs power rating so as to avoid damage of the bulbs.

4 0

3 years ago

A bullet of mass m = 40~\text{g}m=40 g, moving horizontally with speed vv, strikes a clay block of mass M = 1.35M=1.35 kg that i

Sveta_85 [38]

Answer:

v > 133.5 m/s

Explanation:

Let's analyze this problem a little, park run a complete circle we must know the speed of the system at the top of the circle.

Let's start by using the concepts of energy to find the velocity at the top of the circle

Initial. Top circle

Em₀ = K + U = ½ m v² + m g y

If we place the reference system at the bottom of the cycle y = 2R = L

Em₀ = ½ m v² + m g y

final. Low circle

$Em_{f}$ = K = ½ m v₁²

Emo = $Em_{f}$

½ m v² + m g y = 1/2 m v₁²

v₁² = v² + (2g L)

v₁² = v² + 2 g L

The smallest value that v can have is zero, with this value the bullet + block system reaches this point and falls, with any other value exceeding it and completing the circle. Let's calculate for this minimum speed point

v₁ = √2g L

We already have the speed system at the bottom we can use the moment

Starting point before crashing

p₀ = m v₀

End point after collision at the bottom of the circle

$p_{f}$ = (m + M) v₁

The system is formed by the two bodies and therefore the forces to last before the crash are internal and the moment is conserved

p₀ = $p_{f}$

m v₀ = (m + M) v₁

v₀ = (m + M) / m v₁

Let's replace

v₀ = (1+ M / m) √ 2g L

Let's reduce to the SI system

m = 40 g (kg / 1000g) = 0.040 kg

Let's calculate

v₀ = (1 + 1.35 / 0.040) RA (2 9.8 0.753)

v₀ = 34.75 3.8417

v₀ = 133.5 m / s

the velocity must be greater than this value

v > 133.5 m/s

4 0

3 years ago

Volume of water shrinks between__​

Volume of water shrinks between__