Which of the following represents a chemical change to matter? A. digestion of food B. melting an ice cube C. shredding paper D. crushing an ice cube

Answers

Answer 1

Answer: The answer is A. digestion of food. The chemical change to matter means that the molecule structure has been destroyed. For B, C and D. the matter are still ice, paper and ice. So they are physical change.

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Maurice directs a beam of light on a sheet of glass at an angle of 51°. What is the angle of refraction in the glass? The refractive index of glass is 1.46.A: 22 degrees
B: 29 degrees
C: 32 degrees
D: 36 degrees

Answers

Answer:

Angle of refraction in the glass is 32 degrees

Explanation:

It is given that,

Maurice directs a beam of light on a sheet of glass at an angle, θ₁ = 51°

The refractive index of the glass is, n₂ = 1.46

We know that the refractive index of the air is, n₁ = 1

We have to find angle of refraction in glass i.e. θ₂

According to Snell's law :

$(n_1)/(n_2)=(sin\ \theta_2)/(sin\ \theta_1)$

Putting all the values we get :

$(1)/(1.46)=(sin\ \theta_2)/(sin51)$

$\theta_2=sin^(-1)((sin(51))/(1.46))$

$\theta_2=32\ ^0$

Hence, the correct option is (c) " 32 degrees ".

Maurice directs a beam of light on a sheet of glass at an angle of 51°. The refractive index of glass is 1.46. The angle of refraction in the glass is 29 degrees. The answer is letter B.

The solubility of most solids _______ as temperatures decreases.

Answers

Answer:

The solubility of most solids decrease as temperatures decreases.

Hope this helps :)

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5INGH

Explanation:

The age of the universe is thought to be about 14 billion years. Assuming two significant figures, write this in powers of ten in years

Answers

14x10^9 remember to hit that thanks button and rate 5 stars please!!!!

In 2009, a Jamaican sprinter Usain Bolt created a world record in Berlin by running 100 m in just 9.58 seconds. What is his average speed?

Answers

To find Usain Bolt's average speed, you can use the formula for average speed:

Average Speed = Distance / Time

In this case, the distance is 100 meters, and the time is 9.58 seconds. Plug these values into the formula:

Average Speed = 100 meters / 9.58 seconds

Now, calculate the average speed:

Average Speed ≈ 10.44 meters per second

So, Usain Bolt's average speed during his world-record 100-meter sprint was approximately 10.44 meters per second.

Which best describes how DNA is used as a molecular clock?The number of mutations in DNA is compared between two species.
The total amount of DNA is compared between two species.
The percent of carbon in DNA is compared between parent and offspring.< The total mass of DNA is compared between parent and offspring.

Answers

The answer that best describes how DNA is used as a molecular clock is the number of mutations in DNA is compared between two species.

Answer:

The correct answer is a = The number of mutations in DNA is compared between two species.

Explanation:

Hello ! Let's solve this!

The molecular clock is a technique to see the divergence between two species. In other words, to see DNA mutations.

The correct answer is a = The number of mutations in DNA is compared between two species.

The term “radiation” refers to hot materials inside the Earth rising towards Earth’s surface, cooling, and sinking back down.

Answers

No, that's not a true statement. The process you've detailed
is a perfect description of "convection", not radiation.

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