PHYSICS HIGH SCHOOL

Advantages and disadvantages of solar energy

Answers

Answer 1
Answer: Advantages
-renewable
-emissionless
-reduces distance required for electricity to travel
- can be produced effectively on small scale

Disadvantage
-No continual supply-doesnt function on cloudy days or at nightime
-expensive
-inefficient, best solar panels today are only 40% efficient, most are worse

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Which of the following industries has not seen an increase in hazardous waste production?a. medical
b. food
c. energy
d. electronics

Answers

The correct answer is letter b. food. The food industries has not seen an increase in hazardous waste production. Medical, energy and electronics' waste production are mostly hazardous. These hazardous material are dangerous to the environment and as well to our health.

Answer:

food

Explanation:

A ray of light is travelling from north towards south and it has travelled 49 km until it hit a mirror which reflected the light towards east. The ray of light reflected towards east has travelled 47 km until it hit another mirror which reflected it diagonally towards the initial point which is north. How long is the line reflected towards north diagonally? Round the result to two decimals.

Answers

The path is a right triangle. One side of this triangleis 49 km long, the other side is 47 km long.

The hypotenuse is the the diagonal line searched.

So use Pythagora's theorem to find the diagonal line:

Diagonal = √[(47km)^2 + (49km)^2] = 67.90km

Based on relative bond strengths, classify these reactions as endothermic (energy absorbed) or exothermic (energy released):Endothermic
B2+C2-->2BC
A+BC-->AB+C

Exothermic
AB+C-->AC+B
A2+C2-->2AC
A2+B2-->2AB

Answers

Based on relative bond strengths, classify these reactions as endothermic (energy absorbed) or exothermic (energy released):
Endothermic 
B2+C2-->2BC 
A2+C2-->2AC 
A2+B2-->2AB

Exothermic 
AB+C-->AC+B 
A+BC-->AB+C 

Answer:

The correct answer is

Endothermic:

AB+C-->AC+B

A2+C2-->2AC

B2+C2-->2BC

Exothermic:

A+BC-->AB+C

A2+B2-->2AB

Explanation:

Trust Me

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study it? I tried the answer "b." and that's not the right answer I guess.a. The cosmological principle makes assumptions that provide scientific guidelines to enable its study.

b. Physicists develop mathematical equations to determine its physical nature.

c. The Big Bang theory provides the scientific guidelines to enable its study.

d. Scientists are able to gather samples from NASA.

Answers

Answer: a. The cosmological principle makes assumptions that provide scientific guidelines to enable its study.

Explanation:

Scientists cannot physically test their ideas about the origin of the universe but they use cosmological principles to study. Some aspects of the assumptions made on the basis of cosmological principle can be tested. Whatever was formed at the origin of the universe is present around us. Studies are made on them and conclusions are drawn.  

Cosmological principle states that on larger scale, the universe is homogeneous and isotropic. This means in which ever direction we look, its the same and there is no preference to any particular direction to make observations.

There are numerous theories associated with the origin of the universe but none can be proved. The theories can only be studied based on the assumptions made using the cosmological principle.

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study it?

a. The cosmological principle makes assumptions that provide scientific guidelines to enable its study.

Hope this helps.

Which of the following bodies has a brightness that surpasses Venus’? My options are Jupiter, Mars, the stars, and the Moon. Jupiter and mars are obviously out and Venus is brighter than all the stars in the sky (besides the sun lol) so it would be the moon right? just a lil confused.

btw i'm not sure what subject to post this in since there's no astronomy subject.

Answers

Answer: the Moon.

Explanation:

Brightness of celestial object is given in terms of magnitude. Apparent magnitude reflects how bright an object appears from the Earth. The apparent magnitude of the Moon is (-12.7 )greater than the apparent magnitude of the Venus (-4.4). The more negative value, the brighter is the object. Thus, the brightness of the moon surpasses the brightness of Venus.
Hi there!

The answer would be the stars. Since the sun is a star, the star is the answer. A star is much, much hotter than Venus, making it much brighter. 

Hope this helps!

What is the hinky pink for cloudy 24 hours?

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