Hi all! I’m struggling with solving this section in a physics test. Especially the last point.

Answers

Answer 1

Answer:

Answer:

Explanation:

We should know that the gradient(slope) of a distance-time graph is the speed, and the gradient of a velocity-time graph is the acceleration.

a) Since the gradient from t=80 to 160 is 0, the speed is 0, indicating it is at rest.

b)To find the speed, we find the gradient of the graph at t=40. Since it is a straight line from t=40 to 60, we can do this simply by

Gradient = (200-120)/(60-40)=80/20=4 (This is an estimate since the graph is not clear, instead of t=40 and t=60, you can use any two points along that straight line (from about t=20 to 60))

c)The one on the right is the velocity graph, and the one on the left shows acceleration. We can know this by analysing some points. For example, and t=50, the right graph is about constant at 5, while the left one is 0. This would indicate that the left one shows the gradient of the right (gradient of a constant portion is 0). We can choose another place on the right graph, say t=60 to 80. The curve is decreasing. The left graph for this same time period is negative. This reaffirms our guess, since the gradient of a decreasing curve should be negative.

If you want to do it the other way around, you can analyse the left graph. From about t=15 to t=30 the graph is decreasing. Thus its slope should be negative. However, the right graph is positive for this period. This means that the right graph definately does not show the slope of the left.

When you learn about calculus and derivatives, these will become much clearer :)

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The big bang theory is one of the most accepted theories on the origin of the universe because of scientific evidence, such as _____.

Answers

Answer:

Movement of Galaxies away from us.

Explanation:

Big Bang theory is the most widely accepted theory which says that the universe started with a huge expansion, it was not an explosion. By that logic everything must be moving from each other even today. This was proved by observing the Redshift in the spectrum of the galaxies which means that they are moving away from us.

The big bang theory is one of the most accepted theories on the origin of the universe because of scientific evidence, such as d: distant, exploding quasars were found

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c. 1000 mb
d. 1050 mb

Answers

1050 mb of air pressure is likely an indicator of clear weather. The correct option among all the options given in the question is option "d". In reality, higher pressure is mostly associated with clear and good weather while stormy or bad weather is often associated with low air pressure.

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Answers

Most oil classification experts will tell you that you've got to see it,
smell it, weigh it, and feel it before you can classify it. The absolute
minimum is to SEE it, or else have somebody describe it to you.
At the moment, we are totally bereft of any information regarding
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mixture of different hydrocarbons

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