Greg is giving a slide show presentation to a large audience. How might a laser best help him with the presentation?

Physics

2 answers:

gizmo_the_mogwai [7]3 years ago

3 0

Explanation :

The full form of laser is Light Amplification by Stimulated Emission of Radiation. It has particles of very high energy. It points in one direction.

Greg is giving a slide show presentation to a large audience. It is very important to make the presentation informative. By using a laser, we can focus on the important part of the presentation. So that we can highlight the important points.

Bogdan [553]3 years ago

3 0

Answer: When giving a slide show presentation we usually use a projector and a projection screen to show it.

Sometimes, Greg will need to "point" to some graph, image, equation, or something like that in order to drag the audience's attention in such a part.

If Greg went in front of the screen to signalize the part he wants, he will project a shadow on the screen, and this may be troublesome for some of the audience.

A laser comes handy here because Greg does not even need to move to point the laser in the part of the screen he wants, and it does not project a shadow or anything in the screen (The laser emits a "column" of coherent photons, that don't interact with the light of the projector), so it's very useful to signalize points as he speaks, which also allows him to not lose the flow of the presentation.

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Why do the giant planets and their moons have compositions different from those of the terrestrial planets?

dangina [55]

Answer and Explanation:

The formation of planets ,initially was the result of gradual accumulation of solid matter into the solar nebula. As a result of high temperature in the interior of our solar system, metals and rocks were the only materials to get compressed.

The matter that was volatile could not be compressed so close to the heat energy radiated by the early Sun.

On the outer part of the solar system, solid matter included hydrogen compounds, rocks and metals with a lot of matter for planet formation.

The Giant planets were formed by capturing Helium and hydrogen gases as well whereas the terrestrial planets being much more smaller are made up of mainly rocks like silicates and metals like iron.

The moons of terrestrial planets like that of Earth is also terrestrial in nature consisting of rocks and metals as the constituent material while that of giant planets consist of frozen water in half the proportion and the other half is rocks and metals.

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4 years ago

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irina1246 [14]

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3 0

3 years ago

A mug rests on an inclined surface, as shown in (Figure 1) , θ=17∘.

Anna [14]

Refer to the figure shown below.

g = 9.8 m/s², the acceleration due to gravity.
W = mg, the weight of the mug.
θ = 17°, the angle of the ramp.

Let μ = the coefficient of static friction.

The force acting down the ramp is
F = W sin θ = W sin(17°) = 0.2924W N
The normal reaction is
N = W cosθ = W cos(17°) = 0.9563W N
The resistive force due to friction is
R = μN = 0.9563μW N

For static equilibrium,
μN = F
0.9563μW =0.2924W
μ = 0.3058

The frictional force is F = μN = 0.2924W
The minimum value of μ required to prevent the mug from sliding satisfies
the condition
R > F
0.9563μW > 0.2924W
μ > 002924/.9563 = 0.306

Answer:
The frictional force is 0.2924mg, where m = the mass of the mug.
The minimum coefficient of static friction is 0.306