PHYSICS MIDDLE SCHOOL

What are the four most common gases in dry air?

Answers

Answer 1
Answer:

The four most common gases in dry air are nitrogen, oxygen, carbon dioxide, and water vapor.

The four most common gases in dry air are nitrogen, oxygen, carbon dioxide, and water vapor.

Nitrogen is the most abundant gas in dry air, making up about 78.6% of the air.

Oxygen is the second most abundant gas, accounting for approximately 20.9% of the air.

Carbon dioxide is present in small amounts, around 0.04%, but it plays an important role in the Earth's carbon cycle and climate. Water vapor, despite being a variable component, can make up around 0.5% of the air.

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Answer 2
Answer: nitrogen
oxygen
argon
carbon dioxide

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Dale and Alex push on opposite sides of a couch. Dale pushes to the left witha force of 100 N, while Alex pushes to the right with a force of 175 N. If the
couch has a mass of 55 kg, what is the acceleration of the couch?
O A. 5 m/s2 right
O B. 5 m/s2 left
O c. 1.4 m/s? right
O D. 1.4 m/s2 left
SUBMIT

Answers

Answer:

C. 1.4 m/s² right

Explanation:

Apply Newton's second law.  Take right to be positive and left to be negative:

∑F = ma

175 N − 100 N = (55 kg) a

a = 1.4 m/s²

The couch accelerates to the right at 1.4 m/s².

Final answer:

To find the acceleration of the couch, use Newton's second law of motion, which states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration. The net force is calculated by subtracting the forces applied by the two individuals pushing in opposite directions. By plugging in the given values and solving the equation, the acceleration of the couch is found to be approximately 1.4 m/s² to the right.

Explanation:

To find the acceleration of the couch, we need to use Newton's second law of motion, which states that the net force acting on an object is equal to the mass of the object multiplied by its acceleration. In this case, the net force is the difference between the forces applied by Dale and Alex, since they are pushing in opposite directions.

The net force can be calculated as 175 N (force applied by Alex) minus 100 N (force applied by Dale), which equals 75 N. The mass of the couch is given as 55 kg. Plugging these values into the equation, we get:

Net force = mass × acceleration

75 N = 55 kg × acceleration

Dividing both sides of the equation by 55 kg gives us:

acceleration = 75 N ÷ 55 kg ≈ 1.4 m/s²

Since the net force is positive (to the right) and greater than zero, the acceleration of the couch is also to the right. Therefore, the correct answer is 1.4 m/s² right (option C).

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What force stops a car from sinking into the road surface?

Answers

Answer:

Explanation:

There are so many factors which works to stop a car from sinking into road surface. One is reaction force other factors are density of material from which the car is made of, mass and shape of car.but the most important force is the reaction force. According to the Newton's 3rd law of motion:- every force have equal force acting in opposite direction.
I believe it's technically referred to as the Normal force.
However I like to think of it as the reaction force, as it is the force that is a result of obeying Newton's 3rd law ("For every action, there is an equal and opposite reaction"). The upward force from the ground is the reaction to the downward force of gravity.

HELP ASAP What does a pH of 7 indicate about a substance?

A. It is basic
B. It is reactive
C. It is acidic.
D. It is neutral.

Answers

Answer:

D) it is neutral

Answer:

neutral

Explanation:

What is Fossil-rich limestone?

Answers

Fossil rich limestone is limestone with various sea creature fossils in it such as shells. It is organic and fine grained. It is sedimentary...  :) HOPE THIS HELPS U HUN

The slope on a distance-time graph shows a ball moving from 20 m to 40 m in 1 s and from 40 m to 80 m in the next second

Answers

Slope in the first second: 20 m/s

Slope in the next second: 40 m/s

Average slope: 30 m/s

Explanation:

On a distance-time graph, the slope of the curve represents the speed of the object.

In fact, we have:

  • The distance covered is the change in the y-variable, so \Delta y
  • The time elapsed is the change in the x-variable, so \Delta x

Speed is the ratio between distance and time, therefore

speed = (distance)/(time)=(\Delta y)/(\Delta x)

which corresponds to the slope of the line.

In this problem, we have a ball moving from 20 m to 40 m in 1 s, so

distance = 40-20 = 20 m = \Delta y

time = 1 s = \Delta x

So the slope in the first second is

(\Delta y)/(\Delta x)=(20)/(1)=20 m/s

In the next second, the ball moves from 40 m to 80 m, so

distance = 80-40 = 40 m = \Delta y

time = 1 s = \Delta x

So the slope in the next second is

(\Delta y)/(\Delta x)=(40)/(1)=40 m/s

While if we consider the overall graph in the 2 seconds, we have

distance = 80-20 = 60 m = \Delta y

time = 2 s = \Delta x

So the average slope is

(\Delta y)/(\Delta x)=(60)/(2)=30 m/s

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Which of the following is NOT a pur substance A.) milk B.) oxygen C.) water D.) carbon dioxide

Answers

Answer:

milk

Explanation:

it is not a pure substance

milk does is a colloid

oxygen is an element and H20 and CO2 are compounds so they are pure
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