Fossil fuels currently account for the majority of the world’s energy use because they are A. renewable energy resources. B. distributed evenly throughout the world. C. relatively inexpensive and readily available. D. nonpolluting.

Answers

Answer 1

Answer: The answer to your question will be C. because they are very inexpensive and are readily available but they will eventually deplete because we use them faster than they can be produced we use what has been building up.

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When Earth and the Moon are separated by adistance of 3.84 × 10^8 meters, the magnitude of
the gravitational force of attraction between
them is 2.0 × 10^20 newtons. What would be the
magnitude of this gravitational force of attraction
if Earth and the Moon were separated by a
distance of 1.92 × 10^8 meters?
(1) 5.0 × 10^19 N (3) 4.0 × 10^20 N
(2) 2.0 × 10^20 N (4) 8.0 × 10^20 N

Answers

Using the Universal Gratitation Law, we have:

$F= (MmG)/(d^2) \n MmG=2*10^(20)*(3.84*10^8)^2 \n MmG=29.4912*10^36$

Again applying the formula in the new situation, comes:

$F= (MmG)/(d^2) \n F= (29.4912*10^36)/((1.92*10^8)^2) \n \boxed {F=8*10^(20)}$

Number 4

If you notice any mistake in my english, please let me know, because i am not native.

The strength of the gravitational forces between two masses is
inversely proportional to the square of the distance between them.

So if you change the distance to

   (1.92 x 10⁸) / (3.84 x 10⁸) = 1/2

of what it is now, then you would change the force to

   1 / (1/2)² = 4

of what it is now.

   (4) x (2 x 10²⁰) = 8.0 x 10²⁰ newtons .

A failure of the red-sensitive nerves in the eye to respond to light properly causes A. astigmatism.
B. farsightedness.
C. chromatic aberration.
D. color blindness.

Answers

D. colour blindness

"red-sensitive" just means that the nerves are able to see red light

D. Color blindness is your correct answer

What occurs when parallel rays of light hit a rough or bumby surface

Answers

When parallel rays of light hit a rough or bumpy surface, there will be diffused reflection. Meaning, the light that bounces after it hits a rough or bumpy surface is not parallel anymore and cannot form an image. The answer to this question is 'diffused reflection'.

The force of repulsion between two like-charged particles will increase ifA) the distance between the charged particles is increased.

B) the distance between the charged particles is decreased.

C) the magnitude of the charge on both the particles is decreased.

D) the magnitude of the charge on one of the particles is decreased.

Answers

The force of repulsion between two like-charged particles will increase if the distance between the charged particles is decreased.

What is coulomb's law?

According to Coulomb's law: The magnitude of each of the electric forces with which two point-at-rest charges interact is directly proportional to the product of the magnitude of both charges

And inversely proportional to the square of the distance that separates them and has the direction of the line that joins them.

The formula will be given as:

$F=(kq_1q_2)/(r^2)$

We can see that the force is inversely proportional to the distance of the two charges.

To know more about coulomb's law follow

brainly.com/question/66110

Answer:

B). the distance between the charged particles is decreased.

Explanation:

When a sound source is moving toward the observer, the observer will hear a higher pitch. This is due toa. a decrease in the amplitude of the sound wave.
b. a decrease in the frequency of the sound wave.
c. an increase in the frequency of the sound wave.
d. an increase in the amplitude of the sound wave.

Answers

number one a and b are automatically out if you decrease the pitch or frequency you wont hear it louder it does not add up ok?
number 2 the answer would be C the higher the frequency the higher the pitch the lower the frequency the lower the pitch this just comes back to common sense. for example you cant decrease the frequency and than expect a louder pitch its like saying I am going to smash the key on this piano with all my strength and it will make a small very low pitch sound you get what I mean so your answer would indeed be C.

PLEASE help me with these questions as soon as possible i need to turn it in!!!!A 60 watt light bulb uses 60 joules of electrical energy every second. However, only 6 joules of electrical energy is converted into light energy each second.
a. What is the efficiency of the light bulb? Give your answer as a percentage.

b. What do you think happens to the “lost” energy?

19. The work output is 300 joules for a machine that is 50% efficient. What is the work input?

20. A machine is 75% efficient. If 200 joules of work are put into the machine, how much work output does it produce?

Answers

a. I believe this might be the answer but
6 J/60 J= .1
.1 x 100= 10%

b. I'm not sure of this question

19. I'm not sure if I did this correct way or if there is a better way (I'm rusty)
300 J/.50 %= 600
600/100= 6 (answer)

20. (200 J)(.75%) = 150 (answer)
Check:
Efficiency: output/input x 100
150 J/200 J= .75
.75 x 100= 75%

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The usual units of density are:

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