PHYSICS HIGH SCHOOL

A sample that is treated exactly like the other experimental groups except that the variable is not applied to it is a(n) _____. a. observation
b. variable
c. control
d. hypothesis

Answers

Answer 1
Answer: This is a "control" - answer c).

You always need a control in an experiment, otherwise you don't know what influenced the changes. Imagine you make children eat more vegetables and they grow - do you know if it's due to vegetables or not? You need to have another group that eats normal amounts of vegetables to compare this. 

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During exercise, the amount of ____________ carried in the blood to the muscles increases.

Answers

The correct answer is: Oxygen

Explanation:
In order to function properly (movement etc.) during exercise, muscles require oxygen. During exercise, the depth as well as the rate of breathing increase, which in turn increases the amount of oxygen inhaled. In order to expand and contract lungs and for other bodily movements, muscles require oxygen, and for that, more oxygen is carried in the blood to muscles. Hence, the correct answer is Oxygen.

Your answer would be oxygen because when doing moderate to vigorous workouts, your body needs more oxygen to be supplied to your muscles.

Which action is due to field forces?Select one of the options below as your answer: A. an apple falling from a tree B. a moving car stopping when the brakes are applied C. the rowing of a boat D. pushing a chair against the wall

Answers

Field force is when the force which you  exert on prticular subject acts only on this subject, other subjects that sorround yours are not included, whereas the  like gravity acts equally on everything. So the correct answer is D. pushing a chair against the wall.

Answer:

D. pushing a chair against the wall.

Explanation:

How do scientific tests help determine the properties of substances

Answers

It can help determine substances that appear similar but react differently under the same circumstances.

Which phrase best describes wave motion

Answers

Hi!
I don't know your options, but i can describe the wave motion for you:

wave motion is energy transfer through space that proceeds in regular variations (such as vibration),- we say that it's an oscillation because of the regular variations. These variations have specific characteristics, such as frequency or length.

Radio telescopes measure the galaxy’s distribution of

Answers

Radio Telescopes measures the galaxy's distribution of stars, galaxies, blackholes and other astronomical objects. It is used to study naturally -occuring radio light which is emitted by these astronomical bodies. Radio observatories are located far away from major cities to avoid electromagnetic interference from radio, televisions and radar.

hydrogen from which stars are formed

What is the electric field experienced by a charged balloon if the charge on the balloon is 9.4 × 10-10 coulombs and the force it experiences is 8.2 × 10-2 newtons?

Answers

Answer:

Electric field, E=8.72* 10^7\ N/C

Explanation:

It is given that,

Charge on the balloon, q=9.4* 10^(-10)\ C

Force experienced by the balloon, F=8.2* 10^(-2)\ N

The relation between electric force and electric field is given by :

E=(F)/(q)

E=(8.2* 10^(-2))/(9.4* 10^(-10))

E=8.72* 10^7\ N/C

Hence, the electric field experienced by a charged balloon is 8.72* 10^7\ N/C
We know, F = q.E
E = F/q
Here, F = 8.2 * 10⁻²
q = 9.4 * 10⁻¹⁰

Substitute values into the expression:
E = 8.2 * 10⁻² / 9.4 * 10⁻¹⁰
E = 8.72 * 10⁷ N/C

Hope this helps!
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