why do cameras and projectors form real images not virtual

Answer:That only applies to highly polished surfaces, eg mirrors.

If you take a high quality laser (ie with low divergence) and aim it at a wall, you can see the spot where the laser beam reaches the wall from anywhere with a direct line-of-sight to the spot where the laser beam reaches the wall. This due to micro imperfections on the surface of the wall. At a microscopic level, the wall surface is very rough and pointing in all directions.

As to why, a beam of light bounces of a highly polished surface, I can only surmise that it is essentially due to kinematics, ie the only force opposing the light beam is normal to the surface, hence there no forces along the reflective surface. Since there are no forces along the reflective surface, the speed component of light along the reflective surface remains unchanged. However, on the plane perpendicular to the reflective surface the, the light photons bounce off at the same speed at which the hit the reflective surface because the mass of the reflective surface is much much much larger than the mass of the photons, which means that the reflective surface won’t move at all. Since conservation of momentum requires that momentum after the collision be the same as the momentum before the collision then the only way for that to happen is if the velocity of the photon perpendicular to the reflective surface is of exactly the same magnitude but in the opposite direction. Vector resolution of the speed component of the reflected beam means that the angle of reflection must be the same as the angle of incidence.

Explanation:

All of the listed vocal behaviors, including tone of voice, rate of speech, and loudness, are dimensions of nonverbal communication. So, the correct answer is (d) all of these.

These vocal behaviors, along with other nonverbal cues, play a significant role in communication, as they can provide additional meaning, context, and emotional expression to verbal messages.

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Answer:

The answer is most likely C.

Ready-to-eat foods are stored at the top of the fridge, away from raw foods so that harmful bacteria cannot transfer from the raw food to the cooked food. Raw meat, poultry and fish in sealed containers to stop them touching or dripping onto other foods.

Answer:

Explanation:

uncovered

The angle between the given vectors is not provided, but we can calculate it using the dot product of the vectors. Here are the steps to solve the problem:

Step 1: Find the magnitude of vector A

The magnitude of vector A is given as 6.0 units in the negative y direction. This means that the y-component of vector A is -6.0 units.

The magnitude of vector A, |A| = √(Ax² + Ay²)

where Ax is the x-component of vector A, which is not given

Ay = -6.0 units

|A| = √(0² + (-6.0)²)

= 6.0 units

Step 2: Find the x-component of vector B

The x-component of vector B is not given, but we can find it using the y-component of vector B and the magnitude of vector B.

x-component of vector B, Bx = √(B² - By²)

where B is the magnitude of vector B, which is not given

By is the y-component of vector B, which is given as 8.0 units

B = √(Bx² + By²) = √(Bx² + 8.0²)

Therefore, Bx = √(B² - By²) = √(B² - 8.0²)

Step 3: Find the dot product of vectors A and B

The dot product of vectors A and B is given by the formula:

A . B = |A||B| cosθ

where θ is the angle between the vectors. We can solve for cosθ and then find the angle θ.A . B = Ax Bx + Ay

By

A . B = (0)(Bx) + (-6.0)(8.0)

A . B = -48.0

cosθ = (A . B) / (|A||B|)

cosθ = (-48.0) / (6.0)(|B|)

cosθ = (-8.0) / (|B|)

Step 4: Find the angle between vectors A and B

The angle between vectors A and B is given by:

θ = cos⁻¹(-8.0/|B|)

where |B| is the magnitude of vector B, which we can find as follows:

|B| = √(Bx² + By²) = √(Bx² + 8.0²)

Therefore,θ = cos⁻¹(-8.0/√(Bx² + 8.0²))

Hence, the main answer is:

θ = cos⁻¹(-8.0/√(Bx² + 8.0²))

The explanation is as follows:

The angle between vectors A and B is given by:

θ = cos⁻¹(-8.0/|B|)

where |B| is the magnitude of vector B. The magnitude of vector B can be found using the x-component and y-component of vector B as follows:|B| = √(Bx² + By²) = √(Bx² + 8.0²)

The x-component of vector B can be found using the magnitude and y-component of vector B as follows

:x-component of vector B, Bx = √(B² - By²) = √(B² - 8.0²)

Finally, we can substitute the values of |B| and Bx in the equation for θ to get:θ = cos⁻¹(-8.0/√(Bx² + 8.0²))

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Not charged - balloon A

Positively charged - balloon C

Negatively charged - balloon B and D.

Charge is the property of an object which attracts or repels unlike and like charges respectively.

For balloon A, positive charges are equal to the negative charges. So, it is neutral or having no charge.

For balloon B and D, negative charges are greater than the positive charges. So, balloons are negatively charged.

For balloon C, positive charges are greater than the negative charges. So, balloons are positively charged.

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Answer:

solid

Explanation:

In a solid, particles are packed tightly together so they don't move much. The electrons of each atom are constantly in motion, so the atoms have a small vibration, but they are fixed in their position. Because of this, particles in a solid have very low kinetic energy.

"The proper way to name the range of cells located in column A row 3 through column C row 7 is A3:C7."

Each worksheet is composed of countless cells, which are rectangular shapes. A cell is the place where a row and a column meet, or the intersection of a row and a column.

A, B, and C are used to identify columns, while digits are used to identify rows (1, 2, 3). Based on its column and row, each cell has a unique name or cell address. The cell address in the example below is C5, because the chosen cell intersects column C and row 5.

Additionally, it is possible to select many cells at once. A cell range is a collection of cells. You will refer to a cell range using the cell addresses of the first and last cells in the range, separated by a colon, rather than a single cell address. Cells A1, A2, A3, A4, and A5 would be included in the range represented by the letters A1:A5.

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.infinite.

&

also

.virtual.

Answer:

diffraction

Explanation:

The behavior of the light incident upon this page best illustrates the phenomenon of diffraction

hope it help:)

The behaviour of such incident light on just this pages adequately exemplifies the phenomena called Diffraction. A further explanation is below.

The broadening out of waveforms when they transit through such an apertures anywhere around obstructions generally referred to as diffraction.

It happens whenever the aperture as well as obstruction seems of the equivalent order of magnitude as that of the transmitted beam's wavelength.

Thus the approach above i.e., option C is correct.

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Answer:

im not really sure, sorry

Platform moves towards to west with a speed of v0/2 when the dog moves towards to east at a speed of v0, in accordance with the rule of conservation of momentum.

The speed at which an object's location changes in any direction. The distance travelled to the time needed to travel that distance is known as speed. Since speed only has a magnitude and no direction, it is a scalar quantity.

Acceleration is the method of changing a speed with which an object moves. If a substance's velocity does not change, it is not accelerating. Acceleration is a vector quantity.

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The speed with which the string of the kite is let out when the kite is at 100 ft away from the girl would be  14.71 ft/s.

Given that,The height of the kite above the ground is 600 ft.The rate at which the wind carries the kite is 25 ft/sec.Let v be the speed with which the string of the kite is let out when the kite is at 100 ft away from the girl.The kite flies at a constant height and horizontally away from the girl.Thus the horizontal distance x traveled by the kite after t seconds is given by x = 25t.Let y be the height of the kite at time t.

Thus, the length of the string let out is given by s = √(x² + y²).

Differentiating both sides with respect to t we get,ds/dt = (x/√(x² + y²)) (dx/dt) + (y/√(x² + y²)) (dy/dt)Hence ds/dt = (25/√(25² + 600²)) (25) + (y/√(25² + 600²)) (v)

Also, when the kite is 100ft away from the girl, y = 400 ft and we are to find v.

Therefore,ds/dt = (25/√(25² + 600²)) (25) + (400/√(25² + 600²)) (v)ds/dt = 25(25/625) + (400/√(625 + 360000)) (v)ds/dt = 1 + (400v/√360625)

Here, we have to find v when s = 100.We know that, x = 25tThus t = x/25 = 100/25 = 4.

Hence, when the kite is 100ft away from the girl, we have ds/dt = 1 + (400v/√360625)And t = 4.

Therefore, substituting this value in x, we have, x = 25t = 25 × 4 = 100.

Substituting these values in the expression for s, we get,100 = √(100² + 600²) + 400v/√360625100 = 10√37 + 400v/605

Hence, solving for v, we getv = (605/400) (100 - 10√37)v ≈ 14.71 ft/s

Answer: The speed with which the string of the kite is let out when the kite is at 100 ft away from the girl is ≈ 14.71 ft/s.

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Answer:

KITTEEENNSSSSS last one is what i got for critsmas KlikBot Hexagon Special Pack

Explanation:

Answer:

We would apply the relativistic kinetic energy formula which is expressed as

KE = (y - 1)mc^2 = [1/√(1 - v^2/c^2 - 1]mc^2

where

m is the mass of proton

c is the speed of light

v is the speed of the proton

From the information given,

m = 1.67 x 10^-27 kg

c = 3 x 10^8 m/s

v = 0.54c

Thus,

KE = 1.67 x 10^-27 x (3 x 10^8)^2[1/√(1 - (0.54c/c)^2 - 1]

KE = 28.27 x 10^-12 J

We would convert from joules to mev

1 J = 6,241,509,343,260 MeV

28.27 x 10^-12 = 28.27 x 10^-12 x 6,241,509,343,260

KE = 176.48 Mev

the translational kinetic energy is 176.48 Mev

Lamps 1 and 2 are connected in series. lamp 1 stops working because the circuit is not complete.

In a series circuit, the amount of current flowing through any component is the same and the sum of the individual resistances equals the overall resistance of any series circuit.

The voltage in a series circuit is equal to the total of the individual voltage drops.

For the bulb to glow the circuit should be complete. If the circuit is not completed the bulb will not glow.

Lamps 1 and 2 are connected in series. lamp 1 stops working because the circuit is not complete.

Hence, lamp 1 stops working.

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Answer:

c) tension ........ ........

Answer:

gravity

Explanation:

because it cannot be move across if there is present gravity force

Answer:

charge to uspe bro +positive hi rhega

The option that represents your employer's responsibility is to develop a  written hazard communication program. Thus, the correct option for this question is A.

The advantages of a communication program are as follows:

The responsibility of the employer is to develop and articulate the concept of a hazard communication program in detailed written form in order to satisfy the need and requirements of the team, person, society, etc. This becomes more important when it comes to synthesizing the thinking of large members in a single format.

Therefore, developing a written hazard communication program is an option that represents your employer's responsibility. Thus, the correct option for this question is A.

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In comparison to Earth, Mars will have more extreme weather/climatic conditions

Axial tilt is the angular measure between the axis of rotation and the axis of revolution. it affects the extents of varying climatic conditions in a direct proportional relationship. This means that the more the axial tilt the more the difference in extremes of the climatic condition.

Therefore comparing the two axial tilts one can arrive at. Mars having more axial tilt will have more extreme seasonal conditions than Earth.

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Answer:

W = 210 N

Explanation:

For an ideal machine:

\(Work\ In = Work\ Out\\(P)(L)=(W)(H)\)

where,

P = Effort = Spring Scale Reading = 70 N

L = Effort Arm = Length of inclined plane = 12 m

W = Actual Load (Weight) to be lifted = ?

H = Load Arm = Height = 4 m

Therefore,

\((70\ N)(12\ m) = (W)(4\ m)\\\\W = \frac{(70\ N)(12\ m)}{4\ m}\)

W = 210 N

The winds aloft chart for the Great Lakes (Michigan is fine) region displays the wind direction and speed at several altitudes. At 3000 feet, the wind speed is approximately 17 knots.

At 12,000 feet, the wind speed is about 44 knots. The wind speed at FL350 is approximately 67 knots.Surface friction has an effect on the winds close to the ground, slowing them down due to the frictional force exerted on the ground by air molecules. The winds shift direction with altitude, veering to the right of the direction of travel in the northern hemisphere. The approximate location of the Jetstream can be obtained by examining the wind/temperature plot chart. The fastest wind speed at FL360 appears to be approximately 145 knots, traveling towards the northeast. Flight to the east or southeast would benefit from this wind speed.Seasonally, winds aloft change depending on the position of the jet stream, which moves towards the poles during the summer months and towards the equator during the winter months.

The current surface analysis chart (Prog chart) shows the major frontal activity passing through the Midwest states. Precipitation is what leads the frontal passage in general, with both temperature and wind speed/direction changing from behind to ahead of the front.

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Answer:

Described below

Explanation:

1) Solids: In solids, the strong attractive forces between the particles ensure that the particles are packed tightly enough and this means little or no movement between each other. However, when they experience vibration which has relationship with the kinetic energy between them

2) Liquids; In liquids due to the lesser forces of attraction between the particles, it means they tend to glide over each another but however, toward the bottom of the container they will settle. This means that the attractive forces between the liquid particles are barely strong enough to hold onto a specific volume. However, they are not strong enough to keep the molecules from sliding over one other.

3) Gases; In gases, there is almost no existing attractive force in most cases and as a result we can say the kinetic energy of the gas molecules is always greater than the attractive force between them and they are therefore far apart from each other and also move independent of each other.

Answer:

0

Explanation:

When water is pumped out of well A, it causes a drop of 7 inches at point C; if water is pumped from well B into well A (at the same rate the water is pumped out of well A), then it will give a rise of 7 inches at well C. Therefore the net drawdown at well C is:

S = 7-7 = 0

Answer:

4 secs

Explanation:

I am right trust me

169 Kcalories are provided by a portion of food that has 25 grams of carbs, 6 grams of protein, and 5 grams of fat.

Kcalories mean kilo-calories. Basically, kilo-calorie or kcal refers to 1,000 calories. To get the Kcalories of food, you have to add the kcal of carbohydrates, protein, and fat.

Get the product by multiplying the number of grams of carbohydrate, protein, and fat by 4,4, and 9, respectively. So if you want to get the energy or Kcal available from a meal, you must then combine the outcomes.

Simply put it, take note of the following conversions:

So here's how to compute the Kcalories of food that contains 25g carbs, 6g protein, and 5g fat.

1.    25g x 4kcal/g = 100kcal

2.    6g x 4kcal/g = 24kcal

3.    5g x 9kcal/g = 45kcal

4.    100kcal + 24kcal + 45kcal = 169kcal!


Therefore, the food contains 169 kilo-calories!

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Answer:

\(a=0.8\ m/s^2\)

Explanation:

Given that,

Mass of a toy, m = 0.62 kg

Horizontal force, F = 16.3 N

Force on the opposite direction, F' = 15.8 N

We need to find the acceleration of the toy.

Here, two forces are acting in opposite direction, the net force will be the difference of forces.

Net force = 16.3 N-15.8 N

=0.5 N

The formula for net force is given by :

F = ma

a is the acceleration of the toy

\(a=\dfrac{F}{m}\\\\a=\dfrac{0.5\ N}{0.62\ kg}\\\\a=0.8\ m/s^2\)

So, the acceleration of the toy is \(0.8\ m/s^2\).

In physics, tension is described as the pulling force transmitted axially by the means of a string, a cable, chain, or similar object, or by each end of a rod, truss member, or similar three-dimensional object.

According to the question, the formula we use in this method is F = ma as we have to find the acceleration.

Therefore, the formula for the acceleration is

\(a= \frac{F}{m}\)

\(a= \frac{0.5}{0.62}\)

Hence, after the calculation, the acceleration is 0.8m/s.

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Answer:

pushes or pulls

Explanation:

hope this helps....