PHYSICS HIGH SCHOOL

Which statement best describes the formation of diamonds? A. Diamonds form in kimberlites under very low pressure.
B. Diamonds form in kimberlites under very high pressure.
C. Diamonds form in talc under very high pressure.
D. Diamonds form in talc under very low pressure.

Answers

Answer 1
Answer: The correct answer would be (b.) Diamonds form in kimberlites under very high pressure. Kimberlites are one of the most important sources of the mined diamonds and these are formed with a very high pressure. The statement in (d.) would best describe the formation of diamonds.

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Who Can Help ? Much Love If You Can .Select all that apply.
A convex lens _____.

converges light
bulges in the middle
diverges light
is thinner in the middle

Answers

Answer:

Options C and the D are the correct answer.

Explanation:

There are two types of lenses: concave lenses and convex lenses. A convex lens is thinner in the middle. On the other hand, convex lenses are also called diverging lens because after the light passes through it, the ray light spreads out. Due to this, diverges light and is thinner in the middle are the correct answer.
converges light to a focal point.

A rotating fan completes 1200 revolutions every minute. consider the tip of a blade, at a radius of 0.19 m. through what distance does the tip move in one revolution?

Answers

The tip of the fan moves through the outer side of the circle.

So it moves a distance of perimeter of circle in one revolution.

Perimeter of circle = 2\pir, where r is the radius of circle.

In this case radius of circular motion = 0.19 meter

So perimeter of circle = 2\pi*0.19 = 0.38\pi = 1.194 m

So distance does the tip move in one revolution = 1.194 meter

An object moving in a circle at a constant speed is accelerating. Why?A. because it is going faster
B. because it has constant velocity
C. because its direction is changing
D. because the distance it is traveling is changing

Answers


"Acceleration" does NOT mean 'speeding up'.  It means any change
in the speed or direction of motion ... speeding up, slowing down, or
moving in a curve.

An object moving in a circle at a constant speed is accelerating, because
when you're moving along a circle, your direction is constantly changing.

A. Because it is going faster.

Factors that influence the balance of earth's incoming and outgoing radiation are called _____.

Answers

The factors that influence the balance of Earth's incoming and outgoing radiation are called "radiative forcings." These forcings can include natural factors like volcanic eruptions and solar variations, as well as human activities such as greenhouse gas emissions.

Calculate the pressure exerted on a level ground by a man whose mass is 75kg and the area of both his feet is 280 cm2. Give your answer in Pascal (Pa)

Answers

Given:-

  • Mass = 75 kg

  • 280 cm² = 280/10000 m² = 28/1000 m²

Tobecalculated:-

Calculate the pressure exerted on a level ground.

Formulaused:-

Pressure = Force/Area

Solution:-

First of all,

We have to find out Force ;

Force = m × g

Force = 75 kg × 9.8 m/s²

Force = 735 kg.m/s² [ 1 N = kg.m/s² ]

Force = 735 N

Now,

Pressure = Force/Area

Pressure = 735 / 28/1000

Pressure = 735 × 1000 / 28

Pressure = 735000 / 28

Pressure = 26,250 Pascal

The equation for the chemical reaction shown is not balanced. What number should replace the question mark to balance this equation?2KBr + ?Pb(NO3)2 → 2KNO3+ PbBr2

A.
The equation is balanced as is.

B.
A 6 is required.

C.
A 3 is required.

D.
A 2 is required.

Answers

The equation is balanced as it is.
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