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

Answer 1

Answer: 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.

Answer 2

Answer:

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.

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If a platinum wire has a resistance of 15 Ω and is connected across the terminals of a 3.0 V flashlight battery, how much current is in the wire?
if the light completed the 71.0-km round trip in the time it took the mirror to complete one-eighth of a revolution, what is the speed of light?
What is the value of w in the equation1/2w + 7 = 2w - 2

The _______ is the time required for one complete wave oscillation to occur.

Answers

period is the answer

The period is the time required.....

Gas pressure in a closed system is caused by _____.

Answers

Answer:

rapid diffusion of gas throughout the system

Explanation:

It is caused by she system letting off fumes and making gas pressure.

The material through which a mechanical wave travels is

Answers

A mechanical wave is a disturbance in matter that transfers energy through the matter.

Final answer:

Mechanical waves require a medium to travel through, such as a solid, liquid, or gas.

Explanation:

Mechanical waves require a medium through which they can travel. The medium can be a solid, liquid, or gas. Examples of mechanical waves include water waves, sound waves, and seismic waves.

Learn more about Mechanical waves here:

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In the diagram, what is happening to the temperature at Point B? Question 6 options: A. The temperature is rising as the molecules break apart from each other B. The temperature is not rising because the heat is being used to break the connections between the molecules C. The temperature is dropping as the molecules break apart from each other D. The temperature is rising as the substance melts E. The temperature is not rising because the molecules are slowing down

Answers

Answer: The correct answer is option D.

Explanation:

At point B, the temperature becomes constant which means that energy given to the substance is getting used in to the breaking of forces which are present in between the molecules of the substance. These forces are known as inter-molecular forces. Or we can also say that ,at point B the state of the substance is changing.

Hence, the correct answer is option D.

B. The temperature is not rising because the heat is being used to break the connections between the molecules

The _______ the object, the _______ effect a force will have on its motion.A.
softer; less
B.
harder; less
C.
lighter; less
D.
heavier; less

Answers

The correct choice is D. But it's only correct if all the experiments are done on the same planet.

The total rate of energy use in the United States is now such that each person has the equivalent of about ___ horsepower working continuously.98.3 QBtu/year
29 million people in the U.S.
Horsepower= 746 W

The above is the info you will need. This is what I have done so far, but it can NOT be right:
98.3*10^15Btu/year(1 year/365 days) = 0.269315*10^15 Btu/day (0.269315*10^15Btu/day)/291 million = (0.2693*10^15 Btu/day)/291*10^6 ~0.00092548109*10^5 Btu/day = 925,481.09Btu/day
925,481.09Btu/day*(1day/24hour) = 38561.71 Btu/hour ~ 38561.7Btu/hour
1horsepower = 746 W
1 W = 3.412Btu/hr38561.7Btu/hr*(1 W/3.412 Btu/hr) ~ 11301.3 W*(1 hp/746 W) = 15.149 hp

Answers

The more I have worked on this, the stranger it has become.
First ... I didn't know what 'QBTU' means. But I see that you called it
' 10¹⁵ ' so I guess it's 'quadrillion'.
Next ... your given data says 29 million people in the US, and that's
ridiculous. Right now it's about 319 million. It was 290 million in 2002,
and I see that you used 291 million, so that looks like it was a typo.
No problem.

Now . . . I did it 3 or 4 times using that 3.412 BTU/hr = 1 watt . I did get
the significant figures of 152, but I kept getting either 152 HP or 0.152 HP.

At this point, I traced through your solution ... thank you very much for
posting it ... and I'm going to take your colossal load of points for saying
that I I did go through every step in detail, I agree 100% with everything
I see there, and I endorse every move you made.

So up to now, we both agree that we cannot see where 1.5 HP/person
comes from.

I looked back to the conversion factors, and I saw something that could
make the arithmetic less complex: 1 BTU = 1,055 Joules
Look what I can do with that:

   (98.3 x 10¹⁵ BTU/yr) x (1,055 joule/BTU) x
   (yr/365 day) x (day/86,400sec) x
   (HP/746 joule-sec) = 4.4082 x 10⁹ HP

then . . .

(4.4082 x 10⁹ HP) / (29.1 x 10⁷ people) = 15.15 HP/person

I'd say that your work, using the given data, has been vindicated by
an outside, independent consultant. It may not be a true statistic, but
your math is bullet-proof, and the data have been properly implemented.

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