PHYSICS MIDDLE SCHOOL

What is the value of relative humidity when the air is saturated?​

Answers

Answer 1
Answer:

Answer:

100 percent

Explanation:

Relative humidity is the water-vapour content of the air relative to its content at saturation. Saturated air, for example, has a relative humidity of 100 percent, and near the Earth the relative humidity very rarely falls below 30 percent.

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As part of a study of the effects of urbanization, local scientists have taken many data samples over the course of 20 years. The scientists detected increases in local soil erosion, carbon dioxide levels, and air temperatures. What most likely caused these changes?A erosion of topsoil

B altered water flow

C deforestation of woodlands

D decreased water quality

Answers

Answer:

Option (C)

Explanation:

In order to set up urbanization in a selected area, initially, a large number of trees are being cut down. This process is commonly known as deforestation.

The deforestation process has various impacts on the environment and the climatic condition at various places. Extensive cutting down of trees leads to the occurrence of rapid soil erosion, where the materials from the topsoil are entirely carried away by wind and water. Due to this, there occurs a high absorption of incoming solar energy that increases the temperature of that area.

In addition to this, trees are the main source from which the oxygen is provided. The absence of trees also leads to an increase in the amount of carbon dioxide because the carbon dioxide will not be absorbed by the trees and in return, it won't be able to provide us oxygen. Due to this, the amount of carbon dioxide also increases.

Thus, the above changes are caused due to the deforestation of woodlands.

Hence, the correct answer is option (C).

Explanation:

deforestation of woodland

What are some physical properties of a star

Answers

Distance, how much energy generated in the star, size, temp, brightness
1. Apparent magnitude
2. Colur Index
3. Annual parallax/variation period if it is Cepheid variable/Red Shift
4. Radial Velocity & Tangential Velocity
Other quantities are derived from the above basic observational data.

Mechanical energy is the sum of kinetic energy and all forms of potential energy that an object has.Please select the best answer from the choices provided
t or f

Answers

Answer:

the mechanical energy of an object can be the result of its motion (i.e., kinetic energy) and/or the result of its stored energy of position (i.e., potential energy). The total amount of mechanical energy is merely the sum of the potential energy and the kinetic energy.

Answer:

t

Explanation:

A polo player hits a ball with a mass of 0.42 kg with a force of 7.35 Newtons. How does the force the polo player's mallet exerted on the ball compare to the force the ball exerted on the mallet?

A.
The force of the on the mallet is less in magnitude and opposite in direction to the force the ball exerted on the mallet.

B.
The force of the mallet on the ball is greater in magnitude and opposite in direction to the force the ball exerted on the mallet.

C.
The force of the mallet on the ball is equal in magnitude and opposite in direction to the force the ball exerted on the mallet.

D.
The force of the mallet on the ball is equal in magnitude and in the same direction to the force the ball exerted on the mallet.

Answers

Due to the law of conservation of momentum, the force exerted on the mallet is equal and opposite to the force exerted on the ball, so the answer is C.

The answer is C.  The force of the mallet on the ball is equal in magnitude and opposite in direction to the force the ball exerted on the mallet.

Suppose a scientist made this model.what info did the scientist need to know in order to make the model

Answers


Suppose I wanted to answer this question about the model.
What info about the model would I need to know in order to
make any intelligent guess about the model ?

Hint: 
It would really help if I could SEE the model, or at least a photo of it.

What does a mechanical advantage less then one mean? What is gained?

Answers

A mechanical advantage less than ' 1 ' means the output force is less than the input
force. But distance is gained ... the load moves farther than the driving force moves.

An example of all this is a big father and his little 4-year-old daughter playing
on the see-saw in the park.  He adjusts the board so that he's much closer
to the pivot than she is, and that way, their weights can balance each other.

It's set up so that the mechanical advantage from him to her is less than ' 1 '.
Now, look at what happens when Dad sits down on his end of the see-saw,
and pushes it down with his 180 pounds of force.  At the other end, the board
is barely lifting her with a force of just 30 pounds.  BUT ... as he sinks down
only 1 foot against his end of the board, her end rises 6 feet off the ground.
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