Explain how reflection and refraction are similar to each other and different from each other.

Answer:

The correct option is B

B) Scientists can measure how much pollution is given off.

Explanation:

A) To determine what kind of plants do people want, a polling or a survey is carried out. It is not the job of a scientist to carry that out.

B) Scientist have derived various techniques to measure different kinds of pollution. For example, air pollution can be derived from the Air Quality Index, which measure the quality of the air. The higher the value of Air Quality Index, more is the pollution.

C) Scientists are not allowed to pass any laws regarding pollution. Any kind of laws, including those related to pollution are passed by the Congress.

D) Most of the powerplants in US are owned by private business, while some are under control of the government.

Answer:

Scientists can measure how much pollution is given off.

Explanation:

Answer:

By spinning them faster! It would generate more energy!

Explanation:

Answer:

By making the temperature and/or heat higher

Explanation:

Here is the highly detailed, arcane, complex, technical form of Ohm's Law that is needed in order to answer this question  ===>  I = V / R  .

Current = (voltage) / (resistance)

Current = (1.5 V) / (10 Ω)

Current = 0.15 Ampere

Using ohms law

[tex]\boxed{\sf \dfrac{V}{I}=R}[/tex]

[tex]\\ \sf\longmapsto I=\dfrac{V}{R}[/tex]

[tex]\\ \sf\longmapsto I=\dfrac{1.5}{10}[/tex]

[tex]\\ \sf\longmapsto I=0.15A[/tex]

Answer:

c

Explanation:

there is formation of products when t reactants react or collied

Answer:

W = 600 J

Explanation:

We have,

According to attached figure,

Height of the inclined plane is 60 m

Force acting on the block is 10 N

It is required to find the work must be done against gravity to move it to the top of the incline. The work done is given by :

W = mgh

or

[tex]W=F\times h\\\\W=10\times 60\\\\W=600\ J[/tex]

So, the work done against the gravity is 600 J.

Answer: double the speed of the object.

Explanation:

From the definition of power, power is the rate at which work is done. That is,

Power P = Work done/time

But

Work done = force × distance

Work done = F×S

Substitute F × S for work done on power formula.

P = (F×S)/t

P = F × S/t

But S/t = velocity V

P = F × V

Since power P is proportional to speed V, to double the power output of an object, the speed V of the object must be doubled.

Answer:

double speed

Explanation:

Answer: D

Explanation:

Hot magma erupts from a crack in Earth’s crust with a very high temperature that will surely break the bond of water molecules in contact. As a result of this, The water molecules will become less dense and rise upward.

Therefore, "The water will become less dense and rise upward " is the best statement to describes what will happen to the seawater above the crack as a result of convection.

The water will become less dense and rise upward because less denser materials move upward and more denser comes downward.

The seawater  will become less dense and rise upward above the crack as a result of convection because water is less denser and the magma that erupts from the crack is denser due to its high viscosity.

So we can conclude that the water will become less dense and rise upward because less denser materials move upward and more denser comes downward.

Learn more about convection here: https://brainly.com/question/9382711

#SPJ2

Answer:

Explanation:

Heat energy used up can be calculated using the formula:

H = mcΔt

m = mass oof the object (in kg) = 20kg

c = specific heat capacity of water = 4179.6J/kg°C

Δt change in temperature = 80-40 = 40°C

H= 20* 4179.6 * 40

H = 3,343,680Joules

H = 3,343.68kJ

Given the values of wavelength and frequency of the wave, the speed at which it was travelling is 150ms⁻¹.

Wavelength is simply the distance over which the shapes of waves are repeated. It is the spatial period of a periodic wave.

Expression from the wavelength, frequency and speed relation;

λ = v ÷ f

Where λ is wavelength, v is velocity/speed and f is frequency.

Given the data in the question;

We substitute our values into the above expression.

λ = v ÷ f

15m = v ÷ 10s⁻¹

v = 15m × 10s⁻¹

v = 150ms⁻¹

Given the values of wavelength and frequency of the wave, the speed at which it was travelling is 150ms⁻¹.

Learn more about Speed, Frequency and Wavelength here: brainly.com/question/27120701

#SPJ2

We need to find how the gravitational force between two object decreases.

The gravitational force between the objects will decrease by

increasing the distance between the objects

decreasing the mass of one of the objects

decreasing the mass of both objects

Gravitational force is given by

[tex]F=\dfrac{Gm_1m_2}{r^2}[/tex]

where

[tex]G[/tex] = Gravitational constant = [tex]6.674\times 10^{-11}\ \text{Nm}^2/\text{kg}^{2}[/tex]

[tex]m_1[/tex] = Mass of one object

[tex]m_2[/tex] = Mass of other object

[tex]r[/tex] = Distance between the two objects

It can be seen that the gravitational force is proportional to the mass of the objects

[tex]F\propto m_1m_2[/tex]

and inversely proportional to the square of the distance between them

[tex]F\propto \dfrac{1}{r^2}[/tex]

So, if mass of one of the objects decreases then the gravitational force will decrease.

Also, if the distance between the objects increases the gravitational force will decrease.

Learn more:

https://brainly.com/question/21500344

https://brainly.com/question/18961003

Answer:

A, E, F

Explanation:

Right on ED2021

Answer:

Tuning fork frequency

Room temperature

Explanation:

Answer:

a. crust and upper mantle

Explanation:

Answer:

a. crust and upper mantle

Explanation:

vector b is the answer...............

Answer:

Neutrons are the particles which are present in the nucleus of an atom. These have a neutral charge, means that the don't have a positive charge like proton or a negative charge like an electron, but these are far more dense than electrons and protons. Under normal reaction, neutron may seem to just exist, as usually electrons are the particles which forms bonds or breaks them.

However, Neutrons play an important role in the weight and Radioactive properties of a material. During radioactive decay, which occurs in radioactive elements, the nucleus of an atom breaks down and releases energy and matter, which is primarily due to the knocking out of a neutron. These knocked out neutrons forms the basis of the nuclear fission and fusion reactions.

Answer:

A, B Y E

Explanation:

The following is not true about Centripetal Force.

Centripetal Force is the force that makes a body to move in a curved path. The direction of the force to the motion of the body is orthogonal and it is inward towards the fixed point of the center of rotation.

Therefore, following is not true about Centripetal Force.

Learn more about Centripetal Force from the link below.

https://brainly.com/question/20905151

Answer:

A. 0.99 :)

Explanation:

Answer:

46.) A

47.) A

Explanation:

46.) To increase the force with which the wire is pushed when the switch is closed, the current flowing through the wire should be increased and the stronger magnet should be used.

Remember that

F = BIL

The force is directly proportional to magnetic field B and current I

a. I and II only

47.) Since the wires in their coil got hot, and the coil would not turn, this is overheating which may be as a result of to much voltage supply compare to the length of the length of the coil of wire. To correct this, more wire should be added to the coil.

Answer:

The correct option is B.

B) Linear

Explanation:

Suppose initially the value of x is 0, for which y is also 0. When x is increased to 1, the value of y becomes 2. If the value of x is increase to 2, the value of y becomes 4. Similarly, if x is increases to 3,4, and 5, the corresponding values of y we get are 6,8 and 10.

From the above data, we can model that the above relation is:

y = 2x

I've attached the graph of this function below. We can clearly see from the graph that the relation between x and y is linear.

Answer:

Answer is 1/RT=1/RT1+1/RT2+1/RT3

Until there's none of it left. Different radioactive isotopes decay at different rates. And a bigger pile of it will last longer than a smaller pile. Without knowing WHICH radioactive isotope you're asking about, and how much of it you started out with, the answer could turn out to be anywhere between 1 millionth of a second and 1 million years.

Answer:

The found value of r is:

r = 94.7

Explanation:

We know that

cosθ = Base / Hypotenuse

θ is the always the angle between base and hypotenuse

In this right angles triangle, the angle θ is given 63°.

Which means that the Base is 43 and the hypotenuse is r

Base = 43

Hypotenuse = r

Substitute θ=63°, Base = 43 and hypotenuse = r in the formula of cosθ mentioned above:

cos 63° = 43/r

Rearrange

r = 43/cos63°

r = 43/0.454

r= 94.7

Answer: 24 N

Explanation:

Given that the

Mass m = 4 kg

Coefficient of friction (μ) = 0.60

To calculate the static friction between the block and the table before any attempted motion, you will use the formula; F = (μ)N

Where

F = static friction

N = normal reaction = mg

g = acceleration due to gravity = 9.8 m/^2

Substitutes m, g and (μ) into the formula

F = 0.6 × 4 × 9.8

F = 23.52 N

Therefore, the static friction between the block and the table before any attempted motion is 24 N approximately.

The static friction between the block and the table before any attempted motion is to start equals 23.52 Newton.

Given the following data:

To determine the static friction between the block and the table before any attempted motion is to start:

Mathematically, the force of static friction is given by the formula;

[tex]F_s = uF_n[/tex]   ...equation 1.

Where;

But, [tex]F_n = mg[/tex]

[tex]F_s = umg[/tex]   ...equation 2.

Substituting the given parameters into eqn. 2, we have;

[tex]F_s = 0.60 \times 4 \times 9.8\\\\F_s = 23.52\; Newton[/tex]

Force of static friction = 23.52 Newton

Read more: https://brainly.com/question/13754413

Answer:

Fn = 1,78 [N]

β = 6,4⁰   north-east direction

Explanation:

As all charges are positive, forces between electric charges located in the cornes of the base of the triangle and the charge located in the top of the isoceles triangle, are repulsion forces. The east-west direction will depend on where the biggest charge is located, if Q₁ = 9 microC, is in the left end of the triangle base then force on charge Q₃ = 3 microC will have direction north-east, if the above mention configuration change (that means Q₁ is in the right end of the triangle base) then the force will have north-west direction. As in the answer solution, 1,75 [N] direction north-east is offer, we will choose the first configuration. According to that:

K = 1/4*π*ε₀       K  = 8,98*10⁹ [N*m²/C²]

The angles in the base of the triangle are equals (we call it α )

sinα = 0,42/045 = 0,93

α = 69⁰

cosα = 0,356

And  Q₃ = 3 mC     = 3*10⁻⁶ C

Q₁  = 9  mC  =  9*10⁻⁶ C

Q₂  = 5  mC  =  5*10⁻⁶ C

F₁ [Q₁,Q₃]  =  K*Q₁*Q₃/d² ⇒F [Q₁,Q₃] = 8,98*10⁻⁹ *  9*10⁻⁶ * 3*10⁻⁶/(0,45)²[N]

F₁ [Q₁,Q₃]  = 1,2 [N]  direction along the side of the triangle therefore

its components are:

F₁ₓ = F₁* cosα   ⇒ F₁ₓ = 1,2 * 0,356    

F₁ₓ = 0,43 [N]

F₁y = F₁ *sinα   ⇒ F₁y = 1,2 * 0,93

F₁y = 1,16  [N]

Now

F₂ [Q₂,Q₃] = K*Q₂*Q₃/d² ⇒F [Q₂,Q₃] = 8,98*10⁻⁹ *  5*10⁻⁶ * 3*10⁻⁶/(0,45)²[N]

F₂ = 0,67 [N]

F₂ₓ  =  F₂* cosα   ⇒ F₂ₓ  = 0,67*0,356    

F₂ₓ  = 0,24 [N]

F₂y  = F₂*sinα  ⇒ F₂y  = 0,67*0,93

F₂y  = 0,62 [N]

We must remember F₁ and F₂ are repulsion forces, then components over y-axis have the same sense (we must add then) and components over  x-axis  have to be subtracted,  in this case, the sense is determine by major force component (to the right) according to this:

Fy = F₁y * F₂y = 1,16 + 0,62

Fy = 1,78 [N]

And

Fₓ = F₁ₓ - F₂ₓ  =  0,43 - 0,24

Fₓ = 0,19

Net force module is:

Fn = √ (1,78)² + (0,19)²

Fn = 1,79  [N]

Having an angle respect the y-axis:

tan β = 0,19/1,78  ⇒  tan β = 0,11 and from tan  tables

β = 6,4⁰  north-west direction

Answer: magnitude: 1.75 N ; direction: 6.2° north of east

Explanation:

It's right

Answer:

C

Explanation:

Given that a line starts at the origin ( 0, 0) and ends at (5, 20)

Where

V1 = 0

V2 = 20

T1 =0

T2 = 5

The slope or gradient of a velocity time graph is the acceleration.

Slope = change in V/ change in t

That is,

Slope = ( V2 - V1 )/ ( T2 - T1 )

Substitutes all the values into the formula

Slope = ( 20 - 0 )/( 5 - 0 )

Slope = 20/5

Slope = 4 m/s^2

Therefore, acceleration of the object is 4m/s^2

Answer:

The first answer is -20m/s

Explanation:

On EDGE 2021

Least

C

B

A

Greatest

i dont know if this is the same question as yours lol

Answer:

You would use a bar graph

Answer:

C

Explanation:

Hot air rises because when you heat air (or any other gas for that matter), it expands. When the air expands, it becomes less dense than the air around it. The less dense hot air then floats in the more dense cold air much like wood floats on water because wood is less dense than water.

As hotter material gets colder it will sinks down. In the hotter state the molecules gets energetic and gets far apart making them free to rise in the air. Thus option a is correct.

Hot air is less dense than cold air, which is why hot air rises and cold air descends. The earth's weather is controlled by hot and cold air currents. The planet is heated primarily by the sun, which also generates the planet's hot and cold air energy systems.

Since warm air currents originate over oceans, they frequently bring rain. Tropical storms and hurricanes develop at sea and eventually travel near land for this reason.

As hot air from the earth's surface rises, it rapidly turns into cold air as it approaches space. As hot air cools, it descends back to the earth's surface, where it is warmed by the ocean before rising once more. An example of this is a convection current. Thus, option a is correct.

Find more on colder air :

https://brainly.com/question/25341433

#SPJ2

Answer:

The three components of effective communication are:

Explanation:

One should think about what he is going to say, structure his message and focus clearly on a the purpose of sending a message. For example if an employer wants to communicate an employee to improve his performance, he should focus hid communication on the results rather than on his failures.

The person on the other end of the communication should be a good listener. For example in the example given, even if the employer effectively communicates his side of the communication, but the employee is not paying his full attention to what his boss is saying, he wouldn't be able to make much of a difference.

After sending and receiving communication, feedback should be given to complete the communication effectively. For example the employer may tell his boss about what he understood from his boss's speech, or what will he do to improve his performance.

Answer:

D. Perfectly inelastic

Explanation:

Kinetic energy is lost so the two bodies stick together.