A red apple will appear black when illuminated with

Answers

Answer 1
A red apple will appear black when illuminated with cyan light
Answer 2
Cyan, Magenta and Yellow light.

Related Questions

What causes a regular reflection?

A. Light waves strike a rough, uneven surface at a 45 degree angle and are reflected back at a 90 degree angle.

B. Parallel light waves strike a smooth, polished surface and reflect back in the same direction.

C. Parallel light waves strike a rough, uneven surface and reflect in different directions.

D. Light waves strike a smooth, polished surface at a 90 degree angle and are reflected back at a 45 degree angle.

Answers

The answer is B. A regular reflection is when a beam of parallel light rays hits a smooth and plane surface and reflects back parallel as well.

Answer:

Option B. Parallel light waves strike a smooth, polished surface and reflect back in the same direction.

Explanation:

Thinking process:

Light possess a dual nature. It has got wave properties as well as particle (electron-like) properties. This means that light travels in pockets or quanta.

When lights hits a smooth shiny surface, it is immediately reflected back. This can be expressed by the wave equation:

[tex]sin i = sin r[/tex]

Where i is the incident ray - the ray that hits the surface

an        r is the reflected ray  - the ray that leaves the surface.

If the surface is polished and even, it means that the angle of incident is equal to the angle of reflection.

Hence option B is correct.

1. What 2 things can you check prior to starting your car to evaluate if it is safe to drive?

Answers

1) Check under the car for obvious leaks
2) Check fluids in the car periodically
Extra) Check Tire pressure/see if there is any damage to the tires
Check for leaks and tire pressure

A ball is thrown from ground level so as to just clear wall 4m height at distance 4m from wall and falls 14 m from wall . Velocity of ball ?

Answers

Ok, this is a 2d kinematics problem,  the falls 14 m part is confusing, I think it means in the x direction, but you don't need it anyway.

If we know it goes 4m into the air, we know  d = 4m (height of wall), we also know the acceleration a=-9.8m/s^2 (because gravity) and that the vertical velocity when it just clears the wall will be 0 m/s, which we'll call our final velocity (Vf). Using Vf^2 = Vi^2 +2a*d, we can solve this for Vi and drop Vf because it's zero to get: Vi = sqrt(-2ad), plug in numbers (don't forget a is negative) and you get 8.85 m/s in the vertical direction. The x-direction velocity requires that we solve the y-direction for time, using Vf= Vi + at, we solve for t, getting t= -Vi/a, plug in numbers t= -8.85/-9.8 = 0.9 s. Now we can use the simple v = d/t (because x-direction has no acceleration (a=0)), and plug in the distance to the wall and the time it takes to get there v = (4/.9) = 4.444 m/s, this is the velocity in the x direction, we use Pythagoras' theorem to find the total velocity, Vtotal = sqrt(Vx^2 + Vy^2), so Vtotal = sqrt(8.85^2+4.444^2) = 9.9m/s. Yay physics!

According to statistics, currently there are approximately __________ drug users living in the United States.
A. 22 million
B. 15 million
C. 10 million
D. 5 million

Answers

A. 22 Million...........................................................

                                              

How much heat transfer occurs from a system, if its internal energy decreased by 150 j while it was doing 30.0 j of work?

Answers

In this case we apply the concepts in thermodynamics. When it comes to intensive properties like internal energy (U), heat transfer (Q) and work (W), there are already derived relationships for this which were based on differential equations. The equation is

ΔU = Q + W

But we should remember to incorporate their signs because these parameters are dependent on these. According to Van Ness, Smith and Abbott, the sign convention for decreasing is negative. For work, the sign is positive if it is work ON the system, but negative if it is work done BY the system. So, in this case,

ΔU = -150 J
W = - 30 J

Then, we can determine Q.

-150 J = Q - 30 J
Q = - 120 J

This means that 120 J of heat was released by the system to the surroundings.

Hence the heat transfer that occurs from a system will be -120 J.

What is heat transfer?

Heat transfer refers to the movement of heat. The flow of heat across a system's boundary is due to a temperature differential between the system and its surroundings.

The given data in  the  problem is;

ΔU is the internal energy -150 J

W is the work fon = - 30 J

Q is the heat transfer that occurs from a system

The internal energy of the system is found as;

[tex]\rm \triangle U = Q + W \\\\-150 =Q-30 \\\\ Q=-120 \ J[/tex]

The heat transfer that occurs from a system will be -120 J.

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What is the value of work done on an object when a 10-newton force moves it 30 meters and the angle between the force and the displacement is 25°?

Answers

Work = F*d*cos(angle) = 10*30*cos(25) = 271.89 Joules

Jack tries to place magnets on the door of his refrigerator. He observes that the magnets don’t stick. He guesses that the door of the refrigerator is made of a nonmagnetic substance. What stage of scientific investigation does his guess represent?

ask questions

construct a hypothesis

explain the results

make observations

Answers

construct a hypothesis.

Answer:the one above

Explanation:

the one above

How long would it take to drive around earth's equator? (earth's circumference ≈ 40,000 km if driving at 143km?

Answers

The distance traveled is the circumference of the earth (around the equator). This distance is
d = 40,000 km

The average traveling speed is
V = 143 km/h
Note: Speed cannot have units of 143 km, as given in the question.

Because distance = Speed * time, therefore
time = distance/speed.

The time taken to travel around the equator is
time = (40,000 km)/(143 km/h)
        = 279.7 hours

Answer: About 280 hours (nearest hour)

Final answer:

To calculate the time it would take to drive around Earth's equator at a speed of 143 km/h, you use the formula t = d/v, resulting in approximately 279.7 hours. This is an ideal, theoretical scenario.

Explanation:

The question is asking how long it would take to drive around the Earth's equator if you were driving at 143 km/h, given that the Earth's circumference is approximately 40,000 km. To solve this, we will use the formula for speed which is v = d/t, where v is the velocity or speed, d is the distance, and t is the time.

To find the time, we rearrange the formula to t = d/v. Plugging in the values, we get t = 40,000 km / 143 km/h. This calculates to approximately 279.7 hours. However, this is an ideal scenario, ignoring factors such as the need for stops, variations in speed, and the impossibility of driving continuously around the equator due to oceans and other geographic barriers.

Glass is a _____ conductor of heat.

Answers

Glass is a poor conductor of heat
Glass is a "good" conductor of heat.

If the electric field is 12 v/m in the positive x-direction, what is the potential difference between the origin, (0, 0), and the point (3.0 m, 4.0 m)?

Answers

In electromagnetism, an electric field is induced between two oppositely charged parallel plates. This electric field is a consequence of the difference of the potential energy of the plates and the distance between them. The equation is E =V/d, where E is the electric field in volts/m or Joules, V is the voltage of the potential difference in volts, and d is the distance between the plates in meters.

First, we substitute the distance through the distance formula

d = √[(x2-x1)^2+(y2-y1)^2]
d = √[(3-0)^2+(4-0)^2]
d = 5 meters

Substituting the values:
E = V/d
12 = V/5
V = 60 volts
Final answer:

The potential difference between the origin and (3.0 m, 4.0 m) in an electric field of 12 v/m is 36 V, pointing in the direction opposite to the electric field.

Explanation:

The potential difference (ΔV) between two points in an electric field can be calculated using the formula: ΔV = -E x (Xf - Xi), where E is the electric field strength, and Xf and Xi are the final and initial positions, respectively. In this case, the electric field is in the positive x-direction and given as 12 v/m, and the point of interest is (3.0 m, 4.0 m). However, because the electric field is only in the x-direction, the y-coordinate does not affect the outcome.

So, Xf = 3.0 m (the x-coordinate of the point) and Xi = 0 (as we're calculating the potential difference from the origin).

Substituting the given values into the equation, we get ΔV = -12 v/m x (3.0 m - 0) = -36 V.

The negative sign indicates that the potential decreases in the direction of the electric field. So, the potential difference between the origin and the point (3.0 m, 4.0 m) is 36 V, in the direction opposite to the electric field.

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If an engine operates on an input temperature of 800k and an exhaust temperature of 600k, calculate the efficiency of the engine.

Answers

The efficiency of a heat engine can be calculated as the ratio of the work obtained to the heat energy put in at the high temperature,
efficiency = Work_max/Thigh.  
or
efficiency=TH-TL/TH,
where TH is the high temperature and TL is the low temperature.
In our case the heat engine operates between 600K and 800K. SO, TH=800K and TL=600K.
The efficiency is: e=800-600/800=200/800=0,25

Answer:

25.0 %

Explanation:

The number of significant figures in the measurement 0.000 305 kg is

six.

two.

seven.

three.

Answers

Three significant figures

We have that from the Question"The number of significant figures in the measurement 0.000 305 kg is " it can be said that  The number of significant figures in the measurement 0.000 305 kg is

3Option D

From the Question we are told

The number of significant figures in the measurement 0.000 305 kg is

six. two. seven. three.

Generally the rule of significant number state that

Leading zeros are NOT significant.

Therefore

We cont all none zero number

We have

X=3

Therefore

The number of significant figures in the measurement 0.000 305 kg is

3Option D

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What is true of electrolytic cells but is not true of galvanic cells?

Answers

they are non-spontaneous 

Answer:

They are Nonspontanious

Explanation:

(APEX)

A plane can fly 600 miles in the same time as it takes a car to go 120 miles. if the car travels 120 mph slower than the plane, find the speed of the plane.

Answers

The answer is attached.

The bearing of a ship from a lighthouse was found to be n14 degrees14°e. after the ship sailed 7.27.2 miles dueâ south, the new bearing was n31 degrees31°e. find the distance between the ship and the lighthouse at each location.

Answers

To solve this problem, let us first assign some reference points. Let us say that initial position of the ship is called point A while the final position is called point B. While the position of the light house is called point L. Together they form a triangle.

 

The angles are:

angle LAB = 14°

angle ABL = (180 – 31)° = 149°

 

The lighthouse is at L.
The ship sails 7.2 miles to B.

 

We see that angle angle ALB = 180 – angle LAB – angle ABL

Therefore

angle ALB = 180 – 14 – 149 = 17°

 
Now in the triangle ABL, we use the Law of Sines:

 

AL / sin 149 = 7.2 / sin 17

AL = 12.68 miles

BL / sin 14 = 7.2 / sin 17

BL = 5.96 miles

The question requires using bearings and trigonometry to calculate distances between a ship and a lighthouse at two points in time. We form two right-angled triangles with common sides, representing the initial distance, and apply trigonometric functions to solve the distances.

The question involves finding the distance between a ship and a lighthouse at two different locations using bearings. Initially, the bearing of the ship from the lighthouse is N14°E. After the ship travels 7.2 miles due south, the bearing from the lighthouse becomes N31°E. To solve this, you can create two right-angled triangles sharing a common side (the initial distance from the lighthouse) - the first triangle for the initial position and the second for the position after the ship's southward journey. You can then use trigonometry to solve for the distances.

To find the initial distance, consider the bearing N14°E as the angle from due north. This implies the ship is east of the lighthouse. Apply the cosine of 14° to calculate the adjacent side, which represents the initial distance from the lighthouse to the ship. Similarly, for the new bearing of N31°E, after sailing due south, the ship will be further east. Use the cosine of 31° for calculating the new distance to the lighthouse. These calculations will require the use of a calculator.

Using the new position distance and the southward travel of 7.2 miles, it is also possible to calculate the initial distance to the lighthouse before the ship moved southwards. Add the distances traveled eastward from the two positions of the ship to find this initial distance.

If there's nothing faster than light, how did the dark get there first

Answers

It is true that the fastest matter in the universe is light which travels at a speed of 300 million meters per second. Dark is actually the absence of light. Hence, the dark does not travel. It is a vacuum space that appears to be dark because there is no light. In other words, the dark is dependent on light. If there is no light, there is no entity such as dark.

A railroad freight car with a mass of 29,000 kg is moving at 2.2 m/s when it runs into another car with a mass of 30,000 kg the second car is at rest the cars locked together what is the final velocity

Answers

This is very important!

Collision always conserves linear momentum:

m*v, ok??

So, beginning:

29,000*2.2

End:

59,000*v, because they go together (same speed)

v = 29,000*2.2/59,000 = 29*2.2/59 = 1.08 m/s

Remember it, it will come many times!!

Answer:

1.1 m/s for apex 4.1.6.

Explanation:

i clicked that option and it was right

An electric oven has a resistance of 10.0 Ω and a voltage of 220 V. How much current does it draw? 22 A 2.2 A 220 A 2,200 A

Answers

Final answer:

Using Ohm's Law, the electric oven with a resistance of 10.0 Ω and a voltage of 220 V draws a current of 22 A.

Explanation:

An electric oven with a resistance of 10.0 Ω connected to a voltage of 220 V will draw a current that can be calculated using Ohm's Law, which is I = V/R, where I is the current, V is the voltage, and R is the resistance.

Applying the values, we have I = 220 V / 10.0 Ω = 22 A. Therefore, the oven draws a current of 22 A when operating at 220 V.

You place a book on top of a spring and push down, compressing the spring by 10 cm. When you let go of the book, it is pushed up by the spring. Which statement describes what happens to the energy of the spring-book-system?

Answers

At First, there is chemical Energy( in your muscels) which is Used to Push down the spring. This Energy becomes the Energy of the spring, which increases until you stop pushing. If you Put your hand away, the Energy of the spring will become kinetic energ. This Energy is at the highest Level the Moment the book ist Leaving the spring. Afterwards, the kinetic Energy decreases while the Gravitational Potential Energy increases.

Answer: The gravitational potential energy of the system increases.

Explanation:

When the temperature of a coin is raised by 79 °f, the coin's diameter increases by 1.90 × 10-5 m. if the original diameter is 1.55 × 10-2 m, find the coefficient of linear expansion?

Answers

You should use next formula:

L=L0(1+αt) ⇒ α = (L-L0-1)/t

but check numbers, because according to this what you wrote in your question, the coin has 1000 times less diameter after the temperature increase.

The coefficient of linear expansion of the coin be 1.55 × 10 ^-5 /°f.

What is thermal expansion?

The phenomena known as thermal expansion can be seen in solids, liquids, and gases. In this procedure, the application of heat causes an object or body to expand (temperature). The term "thermal expansion" refers to an object's propensity to change its dimensions as a result of heat, including length, density, area, and volume. The substance's kinetic energy increases when it is heated.

Given that:

the original diameter of the coin: l = 1.55 × 10^-2 m.

Increase in temperature: Δt =  79 °f.

Increase in diameter of the coin: Δl = 1.90 × 10^-5 m.

So,  the coefficient of linear expansion: α = Δl/(lΔt )

=  1.90 × 10^-5 m/( 1.55 × 10^-2 m × 79 °f)

= 1.55 × 10 ^-5 /°f

Hence, the coefficient of linear expansion  be 1.55 × 10 ^-5 /°f.

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Compared with a force, a torque involves

Answers

A rotational movement.

You may have noticed that when water boils you can see the bubbles that rise to the surface of the water.. what is inside these bubbles?

Answers

The evaporation point of water at atmospheric condition is 100°C. Evaporation is a process by which the liquid phase water is transformed into gaseous phase. This means that at this point, the water starts to form bubbles. 

The formed bubbles are water vapor (gaseous phase). Because it has lesser density than liquid water, it rises to the topmost part of the layer. 

The bubbles that form and rise when water boils contain primarily water vapor. When the temperature reaches 100°C, the vapor pressure inside the bubbles equalizes with the atmospheric pressure, causing them to rise. This process is what we observe as boiling.

When water boils, you can see bubbles that rise to the surface. These bubbles contain water vapor. At lower temperatures, like 20°C, the bubbles start with some dissolved air and water vapor. As the temperature rises to boiling point (100°C), the amount of water vapor inside the bubbles increases because the vapor pressure reaches 1.00 atm, equalizing with atmospheric pressure. This causes the bubbles to grow and rise to the surface, where they burst, releasing water vapor into the air.

As a solid element melts, the atoms become __________ and they have __________ attraction for one another. more separated, more more separated, less closer together, more closer together, less larger, greater

Answers

The complete statement is 

As a solid element melts, the atoms become more separated and they have less attraction for one another. 

Let me explain to you how this happens. In solid phase. Its molecules are arranged in a very compact manner that is why it takes a definite shape and volume. When it is heated, the kinetic energy of the molecules increases. This is characterized by more frequent collisions. The rise in temperature causes the molecules to move rapidly by vibrating. When it reaches an amount of energy that causes the solid to change phase, this is called the latent energy. The molecules break their form and move farther away from each other until it resembles that of a liquid melting. At this point, the molecules would have lesser attraction because of the distance between them.

A 900-N lawn roller is to be pulled over a 5-cm (high) curb. Radius of roller is 25 cm. What minimum pulling force is needed if angle made by handle is (a) 0 deg (b) 30 degrees?

Answers

Final answer:

When the handle angle is 0 degrees, no minimum pulling force is needed. When the handle angle is 30 degrees, the minimum pulling force needed is 36,000 N.

Explanation:

To calculate the minimum pulling force needed to pull a 900-N lawn roller over a 5-cm curb, we can use trigonometry and the concept of work. The work done to lift the roller over the curb is equal to the force applied multiplied by the distance moved in the direction of the force. Since the force is perpendicular to the direction of motion when the handle angle is 0 degrees, no work is done.

Therefore, no minimum pulling force is needed. When the handle angle is 30 degrees, the work done is equal to the force applied multiplied by the vertical distance lifted. Using trigonometry, the vertical distance lifted is given by 5 cm multiplied by the sine of 30 degrees, which is 2.5 cm (or 0.025 m). Therefore, the minimum pulling force needed is the work done divided by the distance moved, which is 900 N divided by 0.025 m, equal to 36,000 N.

Water turning into steam represents what kind of change

Answers

That would be a Physical change.

Phase changes can be brought about by heating or cooling. For example if water (a liquid) is heated enough, it evaporates and becomes water vapor or steam (a gas). This kind of phase change--liquid to gas--is called evaporation or vaporization.

A 70 kg box is slid along the floor by a 400 N force. The coefficient of friction between the box and the floor is 0.50 when the box is sliding. Find the acceleration of the box

Answers

We have to employ Newton's Second Law and Third Law here: force = mass * acceleration, and every force produces an equal and opposite force.

—The forces vertically are EQUAL, so no acceleration is occurring in this direction. This also means that the force of gravity and the normal force must be equal in magnitude.
—The forces horizontally are NOT equal, so there will be acceleration on this box in this direction. The applied force is going to be larger than the friction force, and the friction force opposes the direction of the applied force.

First, we find the weight of this box, which is given by mass * acceleration due to gravity. On Earth, acceleration due to gravity is about 9.8 m/s^2.
So, 70 kg * 9.8 m/s^2 = 686 N. This force points downwards.
The normal force is equal in magnitude to this, so it is also = 686 N, but points upwards.

The force of friction is given by force(friction) = µ * force(normal). In this problem, µ = 0.50. Then, we plug in to get 0.50 * 686 N = 343 N. This is the force of friction that opposes the motion of the box.

And finally, we are given the applied force, which is 400 N.
Now we make a Newton's second law equation.

force(applied) - force(friction) = mass * acceleration

400 N - 343 N = 70 kg * a

a = .8142 m/s^2

I really hope this is the right answer; it's 4 AM for me lol

The acceleration of the box of mass 70 Kg sliding along the floor and havin 0.5 coefficient of friction is 0.81 m/s².

We'll begin by calculating the frictional force opposing the motion. This can be obtained as follow:

Mass (m) = 70 Kg

Coefficient of friction (µ) = 0.5

Acceleration due to gravity (g) = 9.8 m/s²

Normal reaction (N) = mg = 70 × 9.8 = 686 N

Frictional force (F) =?

F = µN

F = 0.5 × 686

F = 343 N

Thus the frictional force is 343 N.

Next, we shall determine the net force acting on the box. This can be obtained as follow:

Force applied (F) = 400 N

Frictional force (Fբ) = 343 N

Net force (Fₙ) =?

Fₙ = F – Fբ

Fₙ = 400 – 343

Fₙ = 57 N

Thus, the net force acting on the box is 57 N

Finally, we shall determine the acceleration of the box. This can be obtained as follow:

Mass (m) = 70 Kg

Net force (Fₙ) = 57 N

Acceleration (a) =?

Fₙ = ma

57 = 70 × a

Divide both side by 70

a = 57 / 70

a = 0.81 m/s²

Therefore, the acceleration of the box is 0.81 m/s².

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Fluid clutches are used on equipment that is subjected to?

Answers

Fluid clutches are used on equipment that is subjected to higher torque per unit volume. This type of clutch makes use of an incompressible fluid like oil in order to transfer the input of a movement from a pedal and cylinder to an actuating cylinder. Releasing the this clutch would stop the transfer of power but still allowing the engine to turn continuously. 

Final answer:

Fluid clutches are used on equipment that is subjected to various loads and forces. In physics, fluid mechanics is the study of how fluids behave under different conditions, including how they transmit forces and pressures. Hydraulic systems, which use fluid clutches, are a key application of fluid mechanics in engineering.

Explanation:

Fluid clutches are used on equipment that is subjected to various loads and forces. In physics, fluid mechanics is the study of how fluids behave under different conditions, including how they transmit forces and pressures. Hydraulic systems, which use fluid clutches, are a key application of fluid mechanics in engineering.

For example, in heavy machinery like backhoes, hydraulic and mechanical lever systems, powered by fluid clutches, are used to transfer forces and lift heavy loads. These systems can increase or decrease the force applied to them by controlling the pressure and area of the fluid.

What is the difference between accurate data and reproducible data?

Answers

Accuracy is a general concept while precision is more of a mathematical concept.

Answer:


Accuracy is ‘the state of being correct’ and on the other hand precision is ‘the state of being exact.


Explanation:


Accuracy shows the nearness of the measurement with the actual measurement while precision shows the nearness of an individual measurement with other measurements.


Accuracy focuses on the errors caused by the problem in the instrument. while precision is concerned with errors, which occurs periodically with no recognizable pattern.


If the measurement is precise but inaccurate, the result will not be the expected one. And if the result is accurate but imprecise, then there are huge variations in the measurements. And finally, if the actual measurement is neither accurate nor precise, then the result would not have correctness and exactness at the same time.

What would be your estimate of the age of the universe if you measured a value for hubble's constant of h0 = 30 km/s/mly ? you can assume that the expansion rate has remained unchanged during the history of the universe. express your answer using two significant figures. yr?

Answers

First, let's define the units of the Hubble's constant. It is kilometers per second per million light year. Light year is the length of time for the light to travel. Hence, we can use the light year to find the distance travelled by using the speed of light which is equal to 300,000,000 m/s or 300,000 km/s. 1 million light year is equal to 1.314 x 10^12 seconds.

d = s/t = 300,000 km/s ÷ 1.314 x 10^12 s = 3.942 x 10^17 km

Through dimensional analysis:

(3.942 x 10^17 km / 1 MLY) * (1/30km/s/MLY) = 1.314x 10^16 seconds = 10 billion years

The acceleration due to the earth's gravity, in si units, is 9.8 m/s2. in the absence of air friction, a ball is dropped from rest. its speed on striking the ground is exactly 60 m/s. for what time interval was the ball falling?

Answers

We don't know anything about the amount of distance it travels, but that's okay. The only equation we need here is 

velocity(final) = velocity(initial) + acceleration * time
vf = vi + (a * t)

The ball is dropped from rest, so vi = 0 m/s.
We want it so that the ball hits the ground with a final velocity of 60 m/s, so vf = 60 m/s. 
We are given the acceleration due to gravity, a = 9.8 m/s^2.
We are solving for the time, t = ?.

Now we just plug in the values.
vf = vi + (a * t)
60 m/s = 0 m/s + (9.8 m/s^2)*(t)

60 = 9.8t

60 / 9.8 = t

t = 6.122 s

Hopefully this is the right answer.

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