Answer:

**Answer:**

the lowest frequency is

**Explanation:**

In the question it is given that wavelength(L) in the range of 200μm to 400μm.

let ν be frequency of wave v velocity = 3\times 10^8

velocity v= Lν

therefore ν=

frequency ν be lopwest when L will be heighest

ν(lowest)=

ν=

A disk of radius 10 cm is pulled along a frictionless surface with a force of 16 N by a string wrapped around the edge. At the instant when 28 cm of string has unwound off the disk, what is the torque exerted about the center of the disk?

Light emitted by element X passes through a diffraction grating that has 1200 slits/mm. The interference pattern is observed on a screen 75.0 cm behind the grating. First-order maxima are observed at distances of 56.2 cm, 65.9 cm, and 93.5 cm from the central maximum. What are the wavelengths of light emitted by element X?

A 0.060 ???????? tennis ball, moving with a speed of 5.28 m/???? , has a head-on collision with a 0.080 ???????? ball initially moving in the same direction at a speed of 3.00 m/ ???? . Assume that the collision is perfectly elastic. Determine the velocity (speed and direction) of both the balls after the collision.

A circular coil lies flat on a horizontal surface. A bar magnet is held above the center of the coil with its north pole pointing downward, and is released from rest. What is the direction of the induced current in the coil, as viewed from above, as the magnet approaches the coil in free fall?a. clockwiseb. counterclockwisec. There is no induced current in the coil.

A 72.0-kg person pushes on a small doorknob with a force of 5.00 N perpendicular to the surface of the door. The doorknob is located 0.800 m from axis of the frictionless hinges of the door. The door begins to rotate with an angular acceleration of 2.00 rad/s 2 . What is the moment of inertia of the door about the hinges?

Light emitted by element X passes through a diffraction grating that has 1200 slits/mm. The interference pattern is observed on a screen 75.0 cm behind the grating. First-order maxima are observed at distances of 56.2 cm, 65.9 cm, and 93.5 cm from the central maximum. What are the wavelengths of light emitted by element X?

A 0.060 ???????? tennis ball, moving with a speed of 5.28 m/???? , has a head-on collision with a 0.080 ???????? ball initially moving in the same direction at a speed of 3.00 m/ ???? . Assume that the collision is perfectly elastic. Determine the velocity (speed and direction) of both the balls after the collision.

A circular coil lies flat on a horizontal surface. A bar magnet is held above the center of the coil with its north pole pointing downward, and is released from rest. What is the direction of the induced current in the coil, as viewed from above, as the magnet approaches the coil in free fall?a. clockwiseb. counterclockwisec. There is no induced current in the coil.

A 72.0-kg person pushes on a small doorknob with a force of 5.00 N perpendicular to the surface of the door. The doorknob is located 0.800 m from axis of the frictionless hinges of the door. The door begins to rotate with an angular acceleration of 2.00 rad/s 2 . What is the moment of inertia of the door about the hinges?

(b) Is the initial position of car A greater than, less than, or equal to the

initial position of car B?

(c) In the time period from t = 0 tot = 1 s, is car A ahead of car B,

behind car B, or at the same position as car B?

a. ) Is the** velocity **of car A less than the velocity of car B b. the initial position of car A greater than the **initial position** of car B c. ahead In the time period from t = 0 tot = 1 s, is car A ahead of car B?.

**Velocity **is the parameter which is different from speed, can be defined as the rate at which the position of the object is changed with respect to time, it is basically **speeding **the object in a specific direction in a specific rate.

**Velocity** is a **vector quantity** which shows both magnitude and direction and The **SI unit **of velocity is meter per second (ms-1). If there is a change in magnitude or the direction of velocity of a body, then it is said to be** accelerating.**

Finding the** final velocity** is simple but few calculations and basic conceptual knowledge are needed.

For more details regarding** velocity,** visit

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**Answer:**

a. less than, b. greater than, c. ahead

**Explanation:**

I assume the graph is looking like in the picture bellow.

North component:

cos(41.5) * 835 = 625.37 km/h

West component of speed:

sin(41.5) * 835 = 553.29 km/h

After 2.2 hours plane will fly:

2.2*625.37 = 1375.81 km north

2.2*553.29 = 1217.23 km west

North component:

cos(41.5) * 835 = 625.37 km/h

West component of speed:

sin(41.5) * 835 = 553.29 km/h

After 2.2 hours plane will fly:

2.2*625.37 = 1375.81 km north

2.2*553.29 = 1217.23 km west

To find the components of the velocity vector, you can use **trigonometry**. The north component is calculated using the sine function and the west component is calculated using the cosine function. After 2.20 hours, the distance traveled north and west can be found by multiplying the velocity components by the time.

To find the components of the velocity vector in the northerly and westerly directions, we can use trigonometry. The velocity vector is 835 km/h and is traveling in a direction 41.5° west of north. To find the north component, we can use the sine function: **North component = velocity * sin(angle)**. To find the west component, we can use the cosine function: **West component = velocity * cos(angle)**.

After 2.20 hours, we can find the distance traveled north and west by multiplying the velocity components by the time: **Distance north = North component * time** and **Distance west = West component * time**.

Let's calculate the values:

- North component = 835 km/h * sin(41.5°)
- West component = 835 km/h * cos(41.5°)
- Distance north = North component * 2.20 h
- Distance west = West component * 2.20 h

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**Answer:**

N

N

**Explanation:**

= 1 A

= 4 A

= distance between the two wire = 5 m

= Force per unit length acting between the two wires

Force per unit length acting between the two wires is given as

N

= distance of each wire from the midpoint = 2.5 m

Magnetic field midway between the two wires is given as

**Answer:**

5N

**Explanation:**

**(25 N - 20 N = 5 N)**

Answer:

The woman's distance from the right end is 1.6m = (8-6.4)m.

The principles of moments about a point or axis running through a point and summation of forces have been used to calculate the required variable.

Principle of moments: the sun of clockwise moments must be equal to the sun of anticlockwise moments.

Also the sun of upward forces must be equal to the sun of downward forces.

Theses are the conditions for static equilibrium.

Explanation:

The step by step solution can be found in the attachment below.

Thank you for reading this solution and I hope it is helpful to you.

**Answer:**

θ=π/2

**Explanation:**

The definition of work is W = → F ⋅ → d = q E c o s θ d W=F→⋅d→=qEcosθd. So if no work is done, the displacement must be in the direction perpendicular to the force ie c o s θ = 0 → θ = π / 2 cosθ=0→θ=π/2

A charged particle can be displaced without any external work done on it in a uniform electric field when its movement is perpendicular to the direction of the electric field.

In a uniform electric field, the electric force is the same in every direction. Therefore, if a charge were to be displaced perpendicular to the original direction of the electric field (i.e., in the y or z direction), it would not encounter any extra electric forces. This means there would be no **external work** being done on the charge. When a charge is moved perpendicular to an electric field, the field does not affect it, and hence, no work is done by the field.

In other words, a charge can be displaced in this field without any external work being done on it when it is moved in a direction perpendicular to the **uniform electric field**, either in y-axis or z-axis, assuming the electric field is constant in the x-axis direction.

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