PHYSICS MIDDLE SCHOOL

Confused about c). Would it be Q-R because the velocity isn’t increasing or all of them because they are all linear lines?

The question says interval and not interval(s) so that’s why it’s making me think it may be the latter.

Answers

Answer 1

Answer:

Answer:

Q-R is correct

Explanation:

A constant velocity means a velocity that is not changing.

The velocity is increasing (changing) in O-P, P-Q and R-S.

Since the Q-R segment is a horizontal line, the velocity stays the same. If you imagine the graph's velocity y-axis is labelled, it might be easier to think about.

Answer 2

Answer:

Answer:

The velocity is constant only in the Q-R interval.

Explanation:

The graph shows the velocity over time. In the Q-R interval the velocity is equal all over the interval, that is, it is constant. In the other intervals, the velocity increase with some rate, so it is not constant.

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A bird flies 2.8 due west and then 2.7 due north. Another bird flies 2.7 due west and 2.8 due north. What is the angle between the net displacement vectors for the two birds?
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Heat Energy can be transferred from a source to a receiver by
How do liquid water, ice, and water vapor differ from each other?

How is a time interval different from a specific time?

Answers

there is or how many there are of something that you can quantify

access time - (computer science) the interval between the time data is requested by the system and the time the data is provided by the drive; "access time is the sum of seek time and rotational latency and command processing overhead"

How long do CFC molecules remain active in the stratosphere?a. 10 to 50 years
b. 30 to 60 years
c. 60 to 120 years
d. 150 to 500 years

Answers

The CFC molecules remain intact and active long enough to make it into the stratosphere and can then stay active for up to a century!

One chef places a pie in the oven at a low setting so that it is baked in one hour. Another chief place a pie in the oven at a high setting so that the pie bakes in 30 minutes. Is the amount of energy the same in each case? Is the power the same?

Answers

In each case, (the pie in a low setting at one hour versus the pie in a high setting at thirty minutes) the amount of energy is the same. However, the amount of power is different. Since power is the amount of work put in certain amount of time, the power in the high setting is larger compared to the power in the low setting.

What is currently the most supported theory about the future of the universe A.)the universe could remain exactly as it is today
B.) the universe may continue to expand
C.) stars could burn out , causing the universe to become dark and cold
D.) gravity could pull galaxies back together causing a reverse of the Big Bang

Answers

Answer:

B.) the universe may continue to expand

Explanation:

The steady state theory which states that the universe was, is and will be the same, has been discredited by two physicists who found the leftover energy from the big bang.

If you are listening to FM radio, you might have heard some static noise while changing stations, that noise is from the leftover energy from the big bang. This energy is called the dark energy.

The dark energy tries to rip everything apart while gravity tries to hold everything together.

It was observed that the dark energy is stronger than gravity.

The distance between the galaxies is increasing. This proves that the dark energy successfully defeated the gravity and expanted two massive objects in the universe.

Because of this dark energy the universe will continue to expand.

Note: Dark energy is also increasing the distance between protons in atomic nucleus in every atom in our body too. Chilly right?

the answer is B! it would continue to expand.....just took the test XD

How does the mass of an object affect its acceleration during a freefall?

Answers

There is a big misconception about this but I will try to clear it up:
Think about this, if you drop a feather and a marble from the same beginning point then they will both fall at the same rate. This is because, mass doesn't affect the speed of falling objects, however, if there are other factors involved other than gravity then the answer may vary.

Hope this helped

A low-pressure sodium vapor lamp whose wavelength is 5.89 x 10^−7 m passes through double-slits that are 2.0 x 10^−4 m apart and produces an interference pattern whose fringes are 3.2 x 10^−3 m apart on the screen. What is the distance to the screen?3 meters

2.7 meters

1.6 meters

1.1 meters

its literally 1.1 meters I got it right