Calculate the energy of a wave with a wavelength of 8.4x10-5

Answers

Answer 1

Answer: We should really talk about the energy of a photon.
Photon Energy= h x c/ wavelength
where h is Planck's constant and c is the speed of light
h = 6.63 x 10^-34
c =3x 10^8

Energy = 2.37 x 10^-21

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Question 4 4. Two blocks A of mass 15kg and B of unknown mass are connected by a light inextensible string on a rough horizontal surface. A constant force of magnitude 120N is applied onto block A at an angle of 30° to the horizontal as shown in the diagram below. The coefficient of kinetic friction for both blocks is 0.2 and the system of blocks accelerates to the right at 2.08m.s2. B Question 5 A 15 kg 30° 4.1. State Newton's Third law of motion in words 4.2. Draw a labelled free-body diagram for block A 4.3. Show that the frictional force acting on block A as it accelerates is 14.7N 4.4. Calculate the mass of block B [18] 120N (2) (5) (5) [16]
What is the final speed of a lion initially running at a speed of 30 m/s, if it accelerates ata rate of 3 m/s3 for 5 seconds?
Compare the outermost electrons of an atom with the inner most electrons of an atom in terms of energy
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Suppose that now you want to make a scale model of the solar system using the same ball bearing to represent the sun. How far from it would you place a sphere representing the earth? (Center to center distance please.) The distance from the center of the sun to the center of the earth is 1.496×10111.496×1011 m and the radius of the sun is 6.96×1086.96×108 m.

Heat transfer occurs

Answers

It depends on the tempature of something or an object,
The Object has to go from hot to cold, that is a primary example of how heat transfer occurs

A chlorine ion contains 17 protons, 18 neutrons, and 18 electrons. What is the net charge of the ion? A. -e B. 0 C. +e D. -18e

Answers

A chlorine ion contains 17 protons and 18 electrons, which gives it a net charge of -1 1234. Therefore, the correct answer is A. -e.

You are at the Super Bowl. The coach puts you in during the 4th quarter to be the quarterback to secure your team the win. Since you are fresh off the bench, you are able to throw the ball with more force than the last person. What advantages, using Newton's second law, will this have when playing?

Answers

Answer:

the ball will fly faster, and longer distance, which means there is going to be less air resistnace friction acting upon the ball.

Explanation:

F = ma

Force = mass x acceleration

Mass of football remains constant, fresh arm of QB provides higher acceleration.

Ball will get to receiver faster.

One hectare is defined as 104 m2. One acre is 4 ✕ 104 ft2. How many acres are in one hectare?

Answers

For one acre, multiply (4 × 104 feet2) by (meter / 3.28 feet (1 m))2, which equals 3,718 meters. ²

(104 meters) / (3,718 meters) = 2.69 acres per hectare (1 hectare / 1 acre).

What is acres?

The area of land that a yoke of oxen could plow in a day was the definition of the acre, an ancient unit of measurement.

Later, it was established to be one furlong by one chain, or 660 feet (201.17 m) by 66 feet (20.12 m). Its current measurement is 4,046.86 square meters.

4046.856 square meters make up an acre. But 1 hectare is equal to 100 meters by 100 meters, or 10,000 square meters. A hectare is hence larger than an acre (1 ha is equal to 2.47 acres).

An acre is a product of any rectangular land plot with a total area of 4,046 square meters, or 43,560 square feet (4,046.86 m²). Six plots of 6 × 120 feet (36.58 meters) (36.58 m) each make up an acre.

Therefore, 2.69 acres per hectare.

Learn more about acres and hectare here:

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1 acre in square meters:
(4 x 10⁴ feet²) x (meter / 3.28 feet)² = 3,718 meters²

(1 hectare) / (1 acre) = (10⁴ meter²) / (3,718 m²) = 2.69 acre per hectare

Problem 1: You go outside on a hot, sunny summer day and you feel the warm sun on your skin. What causes this warmth?A. The sun heats the air directly around your skin.

B. Waves of light carry energy directly to your skin.

C. Light causes surface waves on your skin.

D. Water vapor in the air warms your skin.

PRoblem 2: When a water wave runs into you at the beach, what causes you to get knocked down?

A. air molecules in front of the wave

B. the wave's energy

C. periodic motion

D. friction

Answers

1) B
The sun transfers energy to the earth via radiation. This radiation is a form of electromagnetic radiation so it heats your skin direclty
2) B
The waves' energy is transferred to you and you lose your footing and fall

B.waves of light carry energy directly to your skin.

A small 175-g ball on the end of a light string is revolving uniformly on a frictionless surface in a horizontal circle of diameter 1.0 m. The ball makes 2.0 revolutions every 1.0 s. What are the magnitude and direction of the acceleration of the ball? What's the tension in the string?

Answers

Answer :

Explanation :

It is given that:

mass of the ball, $m=175\ g=0.175\ Kg$

Radius of circle, $r=(diameter)/(2)=0.5\ m$

The ball makes 2.0 revolutions every 1.0 s. So, angular speed is $\omega=4\pi\ radian/sec$

Since, it is moving in circular path so centripetal acceleration will act here.

So, centripetal acceleration $\alpha$ = $m\omega^2r$

$\alpha=0.175\ Kg* (4\pi)^2* 0.5$

So, $\alpha=13.803\ m/s^2$

Hence, the acceleration is $13.803\ m/s^2$ and it is directed towards the center of rotation.

Tension is a force which is given by :

$F=ma$

$F=0.175\ Kg*13.803\ m/s^2$

$F=2.415\ N$

This is the required answer.

For circular motion.

Centripetal acceleration = mv²/r = mω²r

Where v = linear velocity, r = radius = diameter/2 = 1/2 = 0.5m

m = mass = 175g = 0.175kg.

Angular speed, ω = Angle covered / time

   = 2 revolutions / 1 second

   = 2 * 2π radians / 1 second

   = 4π radians / second

Centripetal Acceleration = mω²r = 0.175*(4π)² * 0.5 Use a calculator

   ≈13.817 m/s²

The magnitude of acceleration ≈13.817 m/s² and it is directed towards the center of rotation.

Tension in the string = m*a

   = 0.175*13.817

   = 2.418 N

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