Light travels through water at 2.2506 x 108 m/s. A person shines a light at a friend that is underwater. If the ray in the water makes an angle of 38° with the normal, what is the angle of incidence?

Answer:

The current is halved

Explanation:

The relationship between the current and the resistance is given by Ohm's Law, as follows:

[tex]V = IR\\I = \frac{V}{R}[/tex]

where,

V = Voltage

I = Current

R = Resistance

Therefore, if we double the resistance:

[tex]I' = \frac{V}{2R}\\\\I' = \frac{1}{2}I[/tex]

Hence the correct option is:

The current is halved

Answer:

A

Explanation:

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The current sensitivity of a galvanometer depends upon the following factors :-

___________

Hope it helps.

RainbowSalt2222

Answer:

Explanation:

11.) d

12.) f

13.) c

15.) i

pls give me brainliest

Answer:

Star, hydrogen and energy

Explanation:

A star is a large ball of gas that generates its own energy by fusing hydrogen atoms to make helium. It is held together by its own gravity. This process emits a tremendous amount of energy, and some of the energy is in the form of light.

The energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. When the core is hot enough, nuclear fusion commences. Fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

Answer:

If I did my calculations correctly then the answer is 11 but I may be weong

Answer:

it's 11

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Answer:

Thermal energy can be transferred to one object to another in the form of heat. It causes molecules and atoms to collide with each other because of the rising of heat.

Explanation: Well thermal energy is a example of kinetic energy. It is heated by motion. It is heat that can be measured

Answer:

Explanation:

Here, we are asked to calculate the average speed in km/minute.

As we know that,

Here,

→ Total distance = 10 km + 10 km

→ Total distance = 20 km

→ Total time = 8 minutes + 2 minutes

→ Total time = 10 minutes

Substitute the values in the formula of average speed,

→ Average speed = Total distance ÷ Total time taken

→ Average speed = 20km ÷ 10 minutes

Answer:

C

Explanation:

When the planet in motion should have the same speed so until it should be acted by an outer force. This statement explained the movement of the planets.

The information regarding the first law of motion is as follows:

Therefore, the third option is correct.

Learn more: brainly.com/question/17738679

Answer:

Let No be initial no of atoms

N = N0 / 2      after 1 half-life

N = N0 / 4     after 2 half-lives

So after 2 half-lives 20 of the 80 atoms remain

Answer:

1 + 3 = 7. X = 2 -9+7=8

Explanation:

Here,

Answer: 2

Explanation: waves transfer energy without transferring mass

When a wave travels through a medium, the wave transfers: 2. energy, only.

A wave can be defined as a disturbance in a medium that progressively transfers (transports) energy from a source to another location, especially without the transportation of mass (matter).

Generally, the energy of a wave is directly proportional to the square of wave amplitude and the square of its frequency. Thus, a wave transfers only energy without mass when it travels through a medium.

Read more on waves here: https://brainly.com/question/19250621

Answer:

D) 1 & 2

Explanation:

Ice melting can be refrozen and although the pencil breaks, it doesn't change the chemical formula of the pencil

Answer:

W = 0 J

Explanation:

The amount of work done by gas at constant pressure is given by the following formula:

[tex]W = P\Delta V[/tex]

where,

W = Work done by the gas

P = Pressure of the gas

ΔV = Change in the volume of the gas

Since the volume of the gas is constant. Therefore, there is no change in the volume of the gas:

[tex]W = P(0\ m^3)\\[/tex]

W = 0 J

Answer:

longitudinal

Explanation:

Answer:

1. Icy

This is so because the icy surface will be slippery due to ice and water residue on it. Not only the stone, anything that goes on the icy surface is likely to slip. There won't be much friction offered by the surface.

If we talk about the sandy surface, the stone won't go far and will be stopped at the nearest point possible and it's also possible that the stone will settle down in the surface.

The dry and cemented surfaces will cause friction when the stone will be thrown on them, which will stop the stone from going far away.

2. Streamline is the body shape which offers very little resistance to the flow of air.

3. Spring balance is a device used for measuring weight of an object object.

(or the force acting on an object)

Answer:

...............

Explanation:

If an object is placed in front of a plane mirror, the size of the object remains same. This is the property of plane mirror. So the height of the object will be 10cm only.

The image position in the plane mirror is 5 cm.

The ratio of the height of the formed image to the height of the object is used to define the magnification created by the mirror.

Here,

Position of the object, u = -10 cm

Height of the object, h = 10 cm

We know that magnification produced by a plane mirror is 1.

So,

Magnification, m = -v/u

1 = -v/u

Therefore, image distance,

v = -u

v = 5 cm

Hence,

The image position in the plane mirror is 5 cm.

To learn more about magnification, click:

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#SPJ2

Answer:

0.665

Explanation:

I did the work. Just plug everything in from the formula. Look at the lesson manual.

Answer:

sorry

Explanation:

Answer:

Air resistance is pushing up on the parachute and force of gravity is pulling down so she slows down. This increases friction which slows free fall down. So when the skydiver reaches terminal velocity, the force of gravity is balance by air resistance. But when the forces are balance, there is no acceleration.

Our solar system is the only place in the universe where gravity played a key part in the formation of planets.

This is Flase

the position that has least kinetic energy is option D

Answer:

True.

Explanation:

In biology, selective breeding is the mechanism by which certain traits or a combination of traits are consciously selected in animal breeding or plant breeding and cultivation. Artificial selection is seen as a counterpart to natural selection, the mechanism by which, in nature, individuals are selected who are better adapted to their natural environment. Both processes have the same genetic principles and background.  Man selects the individuals with the desired traits to produce progeny, making these traits more and more common.

Answer:

RT = 54 Ohms

Explanation:

Given the following data;

Resistance = 18 Ohms

Voltage = 12 Volts

To find the equivalent resistance (RT) of the circuit;

For a series connection, the formula is;

RT = R1 + R2 + R3

RT = 18 + 18 + 18

RT = 54 Ohms

Or

RT = 3*R

RT = 3 * 18

RT = 54 Ohms

Answer:

T = 60°C

Explanation:

We are given;

Mass of water in both cases as 60g.

Thus; m1 = m2 = 60 g

Temperature of first water; T1 = 40°C

Temperature of 2nd water; T2 = 80°C

Let final temperature be T.

To solve for the final temperature, we will use the formula;

(m1 + m2)T = ((m1•T1) + (m2•T2))

(60 + 60)T = ((60 × 40) + (60 × 80))

120T = 7200

T = 7200/120

T = 60°C

Explanation:

the correct answer is (true) if am not mistaking incase am wrong sorry

Answer:

160000 calories or 669440 Joules

Explanation:

Using the formula as follows;

Q = L × m

Where;

Q = amount of heat (J)

L = specific latent heat

m = mass (g)

* Latent heat (L) required for melting of ice is 80 calories/grams.

* Mass of ice in grams = 2kg × 1000 = 2000g.

Hence, Q = 80 × 2000

= 160000 Calories

1 calorie = 4.184J

160000 calorie = 160000 × 4.184

= 669440J

Answer:

yes

Explanation:

moving earth makes us stand on ground

Answer:

the rotation of the earth can affect your weight but not gravity

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Actually Welcome to the concept of Net force on a body.

We know that net force on a body is the force that is calculated from all direction and added , if there is any force remained at last, then the forces are unbalanced,

and if the net force on a body is Zero, then it is a balanced force,

here,

Force to left on skier = 50 N

Force to right on skier = 40 N

hence the net force = left force - right force

Net force = 50 - 40 ==> 10 N

hence the Net force is 10 N in the left direction of the skier.

Answer:

C. Photosynthesis

Explanation:

The redox reaction given in this question is given as follows:

6H2O + 6CO2 → C6H12O6 + 6O2

In this reaction, water (H2O) reacts with carbon dioxide (CO2) to form glucose (C6H12O6) and oxygen (O2). This is the general equation for PHOTOSYNTHESIS process, which is the process whereby plants manufacture their food (sugar) by combining water and carbon dioxide.

In the equation above, water is oxidized into oxygen, while carbon dioxide is reduced into glucose. This makes it an oxidation-reduction (redox) reaction.