PHYSICS HIGH SCHOOL

A sinusoidal wave travels along a string. The time for a particular point to move from maximum displacement to zero is 0.13 s. What are the (a) period and (b) frequency? (c) The wavelength is 1.9 m; what is the wave speed?

Answers

Answer 1

Answer:

Answer:

Part a)

T = 0.52 s

Part b)

$f = 1.92 Hz$

Part c)

$speed = 3.65 m/s$

Explanation:

As we know that the particle move from its maximum displacement to its mean position in t = 0.13 s

so total time period of the particle is given as

$T = 4* 0.13 = 0.52 s$

now we have

Part a)

T = time to complete one oscillation

so here it will move to and fro for one complete oscillation

so T = 0.52 s

Part b)

As we know that frequency and time period related to each other as

$f = (1)/(T)$

$f = (1)/(0.52)$

$f = 1.92 Hz$

Part c)

As we know that

wavelength = 1.9 m

frequency = 1.92 Hz

so wave speed is given as

$speed = wavelength * frequency$

$speed = 1.92 * 1.9$

$speed = 3.65 m/s$

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For an isothermal process, the work done by or on a system of ideal gas is equal to the change in what? A. The work done is equal to the change in internal energy.
B.The work done is equal to the change in heat energy.
C.The work done is equal to change in entropy.
D.The work done is equal to the change in pressure.

Answers

For an isothermal process, the work done by or on a system of ideal gas is equal to the change in heat energy. The correct option is B.

What is isothermal process?

The process in which the temperature remains constant and other physical quantities are variable, is called the isothermal process.

From the first law of thermodynamics, the work done is the difference between heat supplied and change in internal energy of the system.

W = ΔQ - ΔU

For isothermal process, change in internal energy will be zero.

So, work done is equal to the change in heat energy.

Thus, the correct option is B.

Learn more about isothermal process.

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the work done is equal to the change in heat energy

Select all that apply. _____ is a place where the crust of the lithosphere has fractured. A fault A subduction zone An oceanic trench A river

Answers

A fault? yes !A fault is a fracture with a significant rock mass movement as a result.

A subdution zone? No, although it is a place where the tectonic place meet (so are likely to fracture, but do not necessarily need to fracture).

An oceanic trench? No, although a trench does mark where the tectonic plates meet

A river? no!

The only right answer from these available options is a fault.

Each day, Ted can wax 8 cars or wash 10 cars, and Tom can wax 3 cars or wash 5 cars. What is each man's opportunity cost of washing a car?

Answers

Answer:

1/2

Explanation:

This will lead us to simultaneous equation since there are two person involved doing the same job each day.

For Ted;

Since Ted can wax 8 cars or wash 10 cars in a day. Mathematically, we have

8x + 10w = 1... (1)

Where x is for waxing cars, w is for washing cars

Similarly for Tom,

Tom can wax 3 cars or wash 5 cars in a day as well, this gives us;

3x + 5w = 1... (2)

Equating 1 and 2, we have;

8x + 10w = 1... (1)

3x + 5w = 1... (2)

Using elimination method, we will multiply eqn 1 by 3 and eqn 2 by 8 to have;

24x + 30w = 3

24x + 40w = 8

Subtracting eqn 4 from 5 we have;

30w - 40w = 3 - 8

-10w = -5

w = 5/10

w = 1/2

Therefore each man's opportunity cost of washing a car is 1/2

What is the density of 244 grams of aluminum that has a volume of 90 ml?

Answers

Answer:

The answer is 2.71 g/mL

Explanation:

The density of a substance can be found by using the formula

$density = (mass)/(volume) \n$

From the question

mass = 244 g

volume = 90 mL

So we have

$density = (244)/(90) = (122)/(45) \n = 2.71111111...$

We have the final answer as

2.71 g/mL

Hope this helps you

a. Define Valency. b. Write the symbol and valency of the following : (i) Oxygen (ii) potassium 7. a. Magnesium burns in Oxygen to form Magnesium Oxide. a) Name the reactants b) Name the Products c) Write the word equation for the above reaction.

Answers

⚘ YourAnswers:

A) Valency is the combining capacity of any element. Valence electrons refers to the electrons found in the outermost shell of the atom of the element.

B) Symbol and valency:

Oxygen(O) = (At. no. 8) = -2(Valency)
Potassium(K) = (At. no. = 19) = +1(Valency)

C) The reaction would be:

$\large{ \boxed{ \rm{2Mg + O_2 \longrightarrow \: 2MgO}}}$

Reactants = Magnesium and Oxygen
Products = Magnesium oxide
Word equation:

$\large{ \boxed{ \rm{Magnesium + Oxygen \longrightarrow Magnesium oxide.</p><p>}}}$

━━━━━━━━━━━━━━━━━━━━

Answer:

Oxygen-Symbol-O Potassium Symbol-K

What is the difference between a meteorite and a asteroid?

Answers

What's the DiDifference Between Asteroids & MeteoritesBy Karen S. Garvin, eHow ContributorSharePrint this articleAsteroids can become meteorites if they fall to Earth.Both asteroids and meteorites originate in outer space. Asteroids are small planet-like bodies that orbit the sun, and known as planetoids or minor planets. The asteroid belt that lies between Earth and Mars contains hundreds of thousands of these planetoids. Sometimes asteroids fall out of orbit and hit the Earth, and then they become meteorites. However, not all meteorites are asteroids, and meteorites may be from the Moon or another planet.Other People Are ReadingThe Characteristics of Comets, Meteors & AsteroidsWhat Kind of Sediment Is a Piece of Meteorite?AsteroidsAsteroids are small rocky bodies that orbit the sun. Between Mars and Jupiter is the asteroid belt, thought to be a planet that broke apart. Asteroids are inactive, which means they do not have ongoing geologic processes, such as plate tectonics or active volcanoes. An asteroid can become a meteorite if it escapes from orbit and collides with Earth.MeteoritesMeteorites are meteoroids that have impacted the Earth's surface. A meteorite may in fact originate as an asteroid, but meteorites can also come from outside of the solar system. These rocky extraterrestrials can be iron, iron compounds, or stone. Iron meteorites comprise only about 10 percent of all meteorites and contain nickel, which tells scientists they are from outer space.Sponsored Links3D Ground/Earth ScannersGraphical Measuring Results. No Need For A Computer-Get A Quote Nowokm-emirates.com/GroundScannerThe Makeup of Asteroids and MeteoritesScientists once thought asteroids and meteorites consisted of the same materials: stone and iron compounds. However, spectral analyses showed a difference in the reflectance patterns between asteroids and meteorites. It turns out that space weathering, caused by the flow of high-energy ions and small particles, erodes the surface of an asteroid by vaporizing it, and then depositing a layer of film that makes the surface appear dark red. Common meteorites do not have this discoloration.Why Scientists Study AsteroidsScientists study the asteroid belt to gain an understanding of the formation of our solar system and its planets. Asteroids within the asteroid belt between Mars and Jupiter consist of melted minerals. Asteroids from the outer solar system tend to be carbon. The largest asteroid in our solar system is Ceres, which is 580 miles in diameter.The Asteroid MenaceMost asteroids occupy the asteroid belt and orbit the sun in an elliptical orbit. However, some follow different orbits that may bring them into close proximity to Earth. Some scientists believe an asteroid impact caused the extinction of the dinosaurs about 65 millions years ago. Some scientists worry that another asteroid could hit the Earth and wreak havoc on our planet.fference Between an Asteroid and a Meteor?

Asteroids are a rocks which are a part of asteroid belt in our solar system. Sometimes these asteroids get deflected from their paths and attracted towards earth. When the rocks enter earth's atmosphere, they get burnt due to friction with atmosphere. Some asteroids are large enough and get burnt only partially and reach earth's surface. The rocks which reach the earth's surface are called meteorites.

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