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3 years ago

A roller coaster at an amusement park goes from the top of a tall hill to the bottom. during this time, the roller coaster

Physics

1 answer:

Nikolay [14]3 years ago

4 0

There are a couple of things happening while the coaster goes from the top of the hill to the bottom:

The coaster loses gravitational potential energy.
The coaster's loss in potential energy becomes its gain in kinetic energy.
The coaster's gain in kinetic energy causes it to speed up.
Maybe the coaster is also losing some of its newly gained kinetic energy to friction due to contact between the coaster's internal components and air resistance.

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Ideally, rewards should be given immediately and frequently but

snow_lady [41]

The correct answer for the question that is being presented above is this one: "a. only from an instructor or supervisor." Ideally, rewards should be given immediately and frequently but only from an instructor or supervisor to show authority.

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3 years ago

The color in visible light have different

alina1380 [7]

The different colors of visible light have different wavelengths.

5 0

3 years ago

Pure silicon (EBG = 1.1 eV) is used as a photon detector. An incoming photon can strike the surface and excite electrons from th

Agata [3.3K]

Answer:

Explanation:

Complete Question:

A.Compute no of electrons you expect to count if silicon detector is struck with a 1.04 Mev gamma ray produced in a decay of 136 Cs nucleus.

b.Explain counting of electrons is more precise as the detector is cooled well below room temperature

Answer:

Gamma ray energy = $Cs^{135}=1.04 Mev$

photon strikes the surface excite the electrons to move from valence band to conduction band where then counted by detector.

energy gap between valence band and conduction band in case of silicon = 1.1 eV

The minimum amount of energy required is 1.1 ev

minimum number of electron counted is = $\frac{1.04 Mev}{1.1eV/electrom}$

= $0.945\times10^{6}$

In the case of semi conductors

forbidden energy gap in inversely proportional to temperature

with decrease in temperature forbidden energy gap increases,hence electrons jumping from valence band to conduction band decreases and hence counting by detector decreases

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4 years ago

The captain told the passengers that the plane is flying at 450 miles per hour. This information describes the plane's

marta [7]

The speed of the plane

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4 years ago

If a ball is thrown straight up, where is its acceleration the greatest

Lapatulllka [165]

It has acceleration while it's in your hand and you're in the process of flinging it, but we don't know how much.

It has acceleration ... pretty big ... during the short time between hitting the first blade of grass and coming to rest in the dirt, at the end of its trip.

From the time it leaves your hand until it hits the grass on the way down, its has the same constant, continuous acceleration ... 9.8 m/s^2 downward, the acceleration of gravity.

The greatest acceleration is probably at the end of the trip, after it hits the grass, and its speed drops to zero in a tiny fraction of a second.

3 0

4 years ago