PHYSICS HIGH SCHOOL

Light enters water from air at an angle of 25° with the normal, Θ1. If water has an index of refraction of 1.33, determine Θ2.A) 18.5°
B) 34.2°
C) 31.8°
D) 71.5°

Answers

Answer 1
Answer: By Snell's law:

η = sini / sinr.        i = 25,  η = 1.33

1.33 = sin25° / sinr

sinr = sin25° / 1.33 = 0.4226/1.33 = 0.3177    Use a calculator.

r = sin⁻¹(0.3177)

r ≈ 18.52°

Option A.

God's grace.

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Which of the following is not a main cause of weathering? A.wind

B. Glaciers

C. Moving water

D. Human actions

Answers

Which is not a cause of weathering?

A. well I wouldn't say wind because wind is a part of what happens with tornadoes

B. It would be glaciers because they stand alone unless wind or something takes responsible action for it to happen. So it takes either some other thing for it to happen like water and a really cold temperature.

C. Moving water is like rain so it would be a type of climate so it would not be the answer to what is not a main cause of weathering.

D. human actions is a cause for weathering because you can put a box of melted ice cream in a freezer and it will be frozen again.

To make this less confusing I would say it is B. Glaciers because glaciers cannot cause weather to happen.

~QueenBeauty666~

B. Glaciers

a would not do because wind does a lot of weather damage

c would not do because moving waters cause hurricanes

d would not do because humans cause acidic rain

John’s mass is 95.6 kg, and Barbara’s is 55.3 kg. He is standing on the x axis at xJ = +10.9 m, while she is standing on the x axis at xB = +2.50 m. They switch positions. How far and in which direction does their center of mass move as a result of the switch? Distance moved by center of mass =

Answers

Answer:Shifted towards Left by distance of 2.243 m

Explanation:

Given

Mass of john m_1=95.6 kg

Mass of barbara m_2=55.3 kg

John is standing at x=10.9 m

Barbara is standing at x=2.50 m

x_(com)=(m_1x_1+m_2x_2)/(m_1+m_2)

x_(com)=(95.6* 10.9+55.3* 2.5)/(95.6+55.3)

x_(com)=(1180.29)/(150.9)

x_(com)=7.821 m

Now if they change their Position then

x'_(com)=(95.6* 2.5+55.3* 10.9)/(95.6+55.3)

x'_(com)=(841.77)/(150.9)

x'_(com)=5.578

Thus we can see that center of mass shifted towards left by a distance of 2.243 m because heavier is shifted towards left

if the light completed the 71.0-km round trip in the time it took the mirror to complete one-eighth of a revolution, what is the speed of light?

Answers

What light ?
What mirror ?

A ball is thrown vertically upward with an initial velocity of 23.6 meters per second. What is the maximum height reached by the ball? Please include your answer with a unit symbol.

Answers

Answer:

Maximum height attained by the ball will be h = 28.416 m

Explanation:

We have given initial speed of the ball u = 23.6 m /sec

At maximum height velocity will be zero so final velocity v = 0 m/sec

Acceleration due to gravity g=9.8m/sec^2

From law of motion we know that v^2=u^2-2gh

0^2=23.6^2-2* 9.8* h

h = 28.416 m

So maximum height attained by the ball will be h = 28.416 m

"Consider the following atoms: A. Gold, B. Copper, C. Carbon, D.Silver. Consult the periodic table and rank these atoms, from most to least, by their a mass. b. number of electrons. c. number of proto"

Answers

Let's rank the atoms A (Gold), B (Copper), C (Carbon), and D (Silver) based on:

a. Mass (atomic mass or atomic weight)

b. Number of electrons

c. Number of protons

a. Mass (Atomic Mass or Atomic Weight):

1. Gold (A) has an atomic mass of approximately 196.97 atomic mass units (u).

2. Silver (D) has an atomic mass of approximately 107.87 u.

3. Copper (B) has an atomic mass of approximately 63.55 u.

4. Carbon (C) has an atomic mass of approximately 12.01 u.

Ranking by mass from most to least:

1. Gold (A) - 196.97 u

2. Silver (D) - 107.87 u

3. Copper (B) - 63.55 u

4. Carbon (C) - 12.01 u

b. Number of Electrons:

The number of electrons in an atom is equal to the number of protons, which is also the atomic number.

1. Gold (A) has an atomic number of 79, so it has 79 electrons.

2. Silver (D) has an atomic number of 47, so it has 47 electrons.

3. Copper (B) has an atomic number of 29, so it has 29 electrons.

4. Carbon (C) has an atomic number of 6, so it has 6 electrons.

Ranking by the number of electrons from most to least:

1. Gold (A) - 79 electrons

2. Silver (D) - 47 electrons

3. Copper (B) - 29 electrons

4. Carbon (C) - 6 electrons

c. Number of Protons:

The number of protons in an atom is equal to the atomic number.

1. Gold (A) has an atomic number of 79, so it has 79 protons.

2. Silver (D) has an atomic number of 47, so it has 47 protons.

3. Copper (B) has an atomic number of 29, so it has 29 protons.

4. Carbon (C) has an atomic number of 6, so it has 6 protons.

Ranking by the number of protons (which is the same as the ranking by the number of electrons):

1. Gold (A) - 79 protons

2. Silver (D) - 47 protons

3. Copper (B) - 29 protons

4. Carbon (C) - 6 protons

Final answer:

To rank the given atoms by mass, D. Silver has the most mass, followed by A. Gold, B. Copper, and C. Carbon. For number of electrons, B. Copper has the most, followed by A. Gold, C. Carbon, and D. Silver. For number of protons, B. Copper has the most, followed by A. Gold, D. Silver, and C. Carbon.

Explanation:

To rank the given atoms based on their mass, we can refer to the atomic mass or atomic weight of each element. The atomic mass of an element is the sum of the number of protons and neutrons in the nucleus. The element with the highest atomic mass will have the most mass. In this case, the ordering would be D. Silver, A. Gold, B. Copper, and C. Carbon.

To rank the atoms based on the number of electrons, we can refer to the atomic number of each element. The atomic number represents the number of protons, which is equal to the number of electrons in a neutral atom. The element with the highest atomic number will have the most electrons. In this case, the ordering would be B. Copper, A. Gold, C. Carbon, and D. Silver.

To rank the atoms based on the number of protons, we can again refer to the atomic number of each element. The atomic number represents the number of protons in the nucleus. The element with the highest atomic number will have the most protons. In this case, the ordering would be B. Copper, A. Gold, D. Silver, and C. Carbon.

Learn more about Ranking atoms by mass, number of electrons, and number of protons here:

brainly.com/question/33901706

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An extended period when temperatures are well below average is known as a/an A. drought.
B. ice age.
C. cold wave.
D. draft.

Answers

It would be a cold wave. 
Ice ages occur when the temperatures are extremely cold.(long-term)  
Depends on the "period". If weeks, months, or years, then it's a cold wave. If centuries, then you've got yourself an ice age.
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