PHYSICS HIGH SCHOOL

Within a single use of the scientific method, which of the following steps can only be performed afterdata is collected?
A. Controls and variables are chosen.
B. The initial experiment is designed.
C. The initial hypothesis is formed.
D. Conclusions are drawn.

Answers

Answer 1
Answer: Within a single use of the scientific method, the step which would be performed after we collect data, would be the drawing of a conclusion out of the answers that you've presented - D.

It is usually the case that you first have to analyze the data after you've gather it and then you base your conclusions on it. This isn't, however, always the case. 

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What the unit for electric current

Answers

The unit of electric current is the Ampere.

1 Ampere of current means that if you set up your chair and
stare at the electrons flowing past one point in the circuit, you'll
see 1 coulomb of charge passing that point every second.

How will you recognize 1 coulomb of charge ?
Well, every electron carries the same amount of charge, and
we know how much that is.  (Read about the Millikan oil-drop
experiment in 1909.)  So we know how many electrons it takes
to carry 1 coulomb of charge past the point you're watching.

All you have to do is count the electrons as they zip past.
Every time you count  6,241,509,343,000,000,000 electrons,
you can tick off 1 coulomb of total charge that they're carrying.
If you reach that count every second, you know the current
passing that point is 1 Ampere.

Answer: amps

Explanation:

Focus groupsA. are usually composed of 10 to 15 people as participants
B. yield results that are largely dependent on the viewpoint of the researcher
C. always do a good job of representing the broader target market
D. have a low cost per participant

Answers

I think the answer is a

What force is required to accelerate a body with a mass of 15 kilograms at a rate of 8 m/s2?A. 23 kg
B. 120 N
C. 23 N
D. 1.875 kg

Answers

What force is required to accelerate a body with a mass of 15 kilograms at a rate of 8m/s² 

 As Force=Mass X Acceleration

Here F= 15 Kg and Accelerate = 8m/sq sec

So force required = 15×8 = 120N
F = m * a

F = 15 kg * 8 m/s²

F = 120 N

Answer B

hope this helps

Usain bolt can run the 100 m dash in 9.58 s. what is usain's average acceleration during this sprint?

Answers

Assuming Usain Bolt starts from rest (so, its initial velocity is zero), and that his motion is uniformly accelerated, his position at time t  is given by
S(t) = (1)/(2)at^2
where a is the average acceleration and t the time. In our problem, the distance covered is S=100 m and the time taken is t=9.58 s, therefore the average acceleration can be found by re-arranging the previous formula:
a= (2S)/(t^2)= ((2)(100 m))/((9.58 s)^2)=2.18 m/s^2

The asthenosphere is a part of the upper mantle just below the lithosphere that is involved in plate tectonic movement and isostatic adjustments. Which is NOT true about the role of the asthenosphere in plate tectonics?

Answers

Complete option to the question:

A. The asthenosphere is broken up into large continental- and ocean-sized plates.

B. Convection currents within the asthenosphere push magma upward to create new crust.

C. Heat from deep within Earth is thought to keep the asthenosphere malleable.

D. The asthenosphere is the repository for parts of the lithosphere that are dragged downward in subduction zones.

Answer: The correct option is A (The asthenosphere is broken up into large continental- and ocean-sized plates.)

Explanation:

Among the components that makes up the earth crust are the lithosphere and the asthenosphere.

The LITHOSPHERE is the outer layer of the earth structure which consists of the upper part of the mantle and the crust.

The ASTHENOSPHERE is a part of the upper mantle just below the lithosphere that is involved in plate tectonic movement and isostatic adjustments. It is denser and weaker layer of the upper mantle which permits the movement of tectonic plates in the lithosphere.

The asthenosphere is the repository for parts of the lithosphere that are dragged downward in subduction zones.Heat from deep within Earth is thought to keep the asthenosphere malleable. And the convection currents within the asthenosphere push magma upward to create new crust. But it is not broken up into large continental- and ocean-sized plates.

If 20 beats are produced within one second, which of the following frequencies could possibly be held by two sound waves traveling through a medium along a common path at the same time? A. 38 Hz and 63 Hz
B. 22 Hz and 42 Hz
C. 47 Hz and 55 Hz
D. 18 Hz and 26 Hz

Answers

Answer:

B. 22 Hz and 42 Hz

Explanation:

The beat is an interference pattern which occurs when two waves of slightly different frequencies meet each other. The beat is heard as a periodic variation, whose frequency (called beat frequency) is equal to the absolute value of the difference between the frequencies of the individual waves:

f_B = |f_1-f_2|

In this problem, we are told that 20 beats per second are produced, so the beat frequency is

f_B = 20 s^(-1) = 20 Hz

Therefore, we must find the two waves which have a difference in frequency equal to this value, 20 Hz. Let's see each choice:

A. 38 Hz and 63 Hz  --> f_B = |38 Hz-63 Hz|=25 Hz --> NO

B. 22 Hz and 42 Hz  --> f_B = |22 Hz-42 Hz|=20 Hz --> YES

C. 47 Hz and 55 Hz  --> f_B = |47 Hz-55 Hz|=8 Hz --> NO

D. 18 Hz and 26 Hz --> f_B = |18 Hz-26 Hz|=8 Hz --> NO

So, the correct choice is

B. 22 Hz and 42 Hz


The right answer for the question that is being asked and shown above is that: "B. 22 Hz and 42 Hz." If 20 beats are produced within one second, the frequencies that could possibly be held by two sound waves traveling through a medium along a common path at the same time is B. 22 Hz and 42 Hz 
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