PHYSICS HIGH SCHOOL

A train moves at a constant velocity of 90 km/h. How far will it move in 0.25h?
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Answers

Answer 1
Answer: In 0.25h it will move in 22.5 kilometers.

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What is its characteristic wavelength? [Hint: Recall that the kinetic energy of a moving object is E=12mv2, where m is the mass of the object and v is the speed of the object.]

Answers

Answer:

λ =  1.06 * 10^(-11) m

Explanation:

Using the De Broglie equation, the characteristic wavelength is given by:

λ = (h)/(p)

where

h = Planck's constant = 6.626 * 10^(-34) Js.

p = momentum

Momentum, p, can be calculated using:

p =  √(2Em)

where

m = mass of the electron = 9.11 * 10^(-31) kg

E = Energy of the electron = 13.4 keV = 13.4 * 10^3 * 1.6 * 10^(-19) J = 2.144 * 10^(-15) J

=> p = \sqrt{2 * 2.144 * 10^(-15) * 9.11 * 10^(-31)}

p = \sqrt{3.906 * 10^(-45)}

p = 6.250 * 10^(-23) kgm/s

Therefore, characteristic wavelength, λ, is:

λ =  (6.626 * 10^(-34))/(6.250 * 10^(-23))

λ =  1.06 * 10^(-11) m

In physics, the characteristic wavelength is the wavelength associated with an object's kinetic energy. It can be determined using the equations for energy, frequency, and wavelength.

In physics, the characteristic wavelength refers to the wavelength associated with a moving object's kinetic energy. The kinetic energy of an object is given by 1/2mv², where m is the mass of the object and v is its speed.

When an object's kinetic energy is known, we can use the equation E = hf, where E is the energy, h is Planck's constant, and f is the frequency of the wave associated with the object, to find the characteristic wavelength.

The equation is rearranged to solve for f, and then the frequency is used to calculate the wavelength using the formula λ = c/f, where λ is the wavelength and c is the speed of light.

By plugging in the given values of the object's mass and speed, you can determine its characteristic wavelength using these equations.

Learn more about characteristic wavelength here:

brainly.com/question/34267508

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Oil flows upward in the wick of a lantern because of the liquid property called

Answers

Oil flows upward in the wick of a lantern because of the liquid property called Capillarity c:

Why do deer depend on plants to survive

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Deer depend on plants to survive because they are herbivores. Herbivores are animals that only eats plants and fruits in order to survive. Deer's meal includes grass and evergreen plants. If grass is unavailable, they eat whatever food like fallen leaves, twigs, bushes and other woody plants. 

Justin is standing in the tee box and swings the golf club. As he swings, the end of the golf club gains speed and _____________. A. Chemical energy B. Kinetic energy C. Potential energys he swings,

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Kinetic energy is gained.

Potential energy is gained here as he swings.

What kind of energy involves the flow of positive charges?

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Answer:

Electrical energy

Explanation:

Electrical energy is the form of energy that results from the existence of an electric current, that is, a flow of electrical charges, through a metallic conductor cable as a result of the potential difference that a generator is applying at its ends.
Electrical would be the energy that involves the flow of positive charges.

What is air pressure?

Answers

Air pressure is the amount of molecules in the air. For example, the higher you go in Earth's atmosphere the less pressure so less molecules. 
Air pressure also varies over time, and these temporal differences are usually caused by the temperature of the air. Cool air is denser (heavier) than warm air. Warm air is less dense (lighter) than cool air and will therefore rise above it. Areas of high pressure can be caused when cool air is sinking and pressing on the ground. At this time, the weather is usually dry and clear. In contrast, when warm air rises, it causes a region of low pressure. With low pressure, the weather is often wet and cloudy.
Air pressure varies over time and from place to place. If we travel up a mountain or go up in a hot air balloon, for example, the air pressure gets less the higher we go. We can explain this difference by comparing air pressure to a pile of blankets on your bed.
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