PHYSICS HIGH SCHOOL

When a substance changes from any state of matter to another it is calleda. sublimation.
b. condensation.
c. absolute zero.
d. a phase change.

Answers

Answer 1
Answer: It is called a phase change. Option D.

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What word is used to describe knowledge about the universe and the method of obtaining that knowledge?

Answers

Astrophysics is a term used to describe knowledge about the universe. 

Signal words most often used in a chronological essay are

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Chronological essays by the definition of a chronologicalmeaning in order. There is an order in a specific writing. Like a history writeup from a certain happening years ago.  Itis different from procedural essays because these are essays who are givinginstructions of certain set up to guide the person accordingly in doingsomething to make it more accurate. Like recipes, instructions in playing, etc.Example words that are used in chronological essays are first, second, third,fourth, fifth, next, after, then, lastly, finally, consequently, in addition,thus, therefore, however, etc.

A hypothesis is a lucky guess. True or False. . . Question 2.2. The conclusion of a study should always be that the hypothesis is correct. True. or False Question 3.3. Which variable is measured in an experiment? a. independent variable. b.dependent variable c.experimental variable. . . Question 4.4. Most scientists come up with questions to investigate out of the blue. True. or False

Answers

The answer for the first is False, it is not based on luck but on previously conducted research or previous studies. The second one is also False. Even not proving a hypothesis can help science because then future researches know what is not true and can create new hypotheses based on that. The third one is C. experimental variable. That's when everything is the same except for that one which makes it an experiment. The last one is also false. The questions are usually based on previous research that was studied, read, or similar.

The person who answered them all one of them is incorrect the rest are right. But the one about "Which variable is measured in an experiment?" The answer is dependent variable.

Which of the following best defines the science of separating color wavelengths?a. spectroscopy
b. color-detection
c. photo-chemistry
d. spectrophotometry

Answers

Answer: spectroscopy

Spectroscopy is the separation of the light in the different wavelengths and spectrophotometry measures the intensities of the different components of the light to get the composition of substances.

Answer:

A

Explanation:

I took the test :)

You drive your car for 2.0 h at 40.0 km/h then for 2.0 h at 60.0 km/h what is your average velocity?

Answers

In order to calculate velocity, we'd need to know the straight-line distance between the start and the finish, and we'd also need the direction of that line.  The best we can do with the information given in the question is calculate the average SPEED.

Average speed = (total distance covered) / (time to cover the distance).

Distance covered in the first 2 hours = (2 hr) x (40 km/hr) = 80 km.
Distance covered in the second 2 hours = (2 hr) x (60 km/hr) = 120 km.

Total distance covered = (80 + 120) = 200 km
Time to cover the distance = (2 + 2) = 4 hours

Average speed = (200 km) / (4 hours)  =  50 km/hour

How do you solve this question. I found the first part but don't know how to find distance

Answers

Why don't you try using the following kinematics formula

Vf^2 = Vi^2 + 2ad

Then solve for d, distance.

The distance it traveled during that time is

                 (average speed) x (length of time) .

The average speed is

                 (1/2) (starting speed) + (ending speed) .

They gave you the starting speed.
You calculated the ending speed.
So you can calculate the average speed.

They gave you the length of time.
So you can calculate the distance.
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