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3 years ago

What is the speed of a wave with 3Hz frequency and a wavelength of 9 m

Physics

1 answer:

SIZIF [17.4K]3 years ago

7 0

Answer:

Given

Frequency (f) = 3Hz

Wavelength = 9 m

Speed = ?

Explanation:

we know

Speed = wavelength * frequency

= 9*3

= 27 m/ s

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Sin100cos40-cos100sin40

Andre45 [30]

Answer:

Sin(60°)= $\frac{\sqrt{3} }{2}$

Explanation:

Assuming the given angles are in degrees

We know that Sin(A-B)=SinACosB-CosASinB

Here A=100° and B=40°

$Sin(100)Cos(40)-Cos(100)Sin(40)=Sin(100-40)=Sin(60)=\frac{\sqrt{3} }{2}$

6 0

3 years ago

. Draw a Cartesian coordinate system on a sheet of paper. On this Cartesian coordinate system, draw each vector to scale, starti

Triss [41]

Answer:

a) the first vector has magnitude 58 cm and the angle is 15 measured clockwise from the positive side of the x-axis

b) the second vector, the magnitude is 55.7 cm and the angle is 35 half from the negative side of the x-axis in a clockwise direction

c) the magnitude is 54.2 cm with an angle of 18 measured counterclockwise from the x-axis

Explanation:

For this exercise we draw a Cartesian coordinate system in this system: East coincides with the positive part of the x-axis and North with the positive part of the y-axis.

a) the first vector has magnitude 58 cm and the angle is 15 measured clockwise from the positive side of the x-axis

b) the second vector, the magnitude is 55.7 cm and the angle is 35 half from the negative side of the x-axis in a clockwise direction

c) the magnitude is 54.2 cm with an angle of 18 measured counterclockwise from the x-axis

In the attachment we can see the representation of the three vectors

8 0

2 years ago

A laser beam is incident on two slits with a separation of 0.200 mm, and a screen is placed 5.00 m from the slits. If the bright

amm1812

Answer:

632 nm

Explanation:

For constructive interference, the expression is:

$d\times sin\theta=m\times \lambda$

Where, m = 1, 2, .....

d is the distance between the slits.

The formula can be written as:

$sin\theta=\frac {\lambda}{d}\times m$ ....1

The location of the bright fringe is determined by :

$y=L\times tan\theta$

Where, L is the distance between the slit and the screen.

For small angle , $sin\theta=tan\theta$

So,

Formula becomes:

$y=L\times sin\theta$

Using 1, we get:

$y=L\times \frac {\lambda}{d}\times m$

For two fringes:

The formula is:

$\Delta y=L\times \frac {\lambda}{d}\times \Delta m$

For first and second bright fringe,

$\Delta m=1$

Given that:

$\Delta y=1.58\ cm$

d = 0.200 mm

L = 5.00 m

Also,

1 cm = 10⁻² m

1 mm = 10⁻³ m

So,

$\Delta y=1.58\times 10^{-2}\ m$

d = 0.2×10⁻³ m

Applying in the formula,

$1.58\times 10^{-2}=5.00\times \frac {\lambda}{0.2\times 10^{-3}}\times 1$

$\lambda=632\times 10^{-9}\ m$

Also,

1 m = 10⁹ nm

<u>So wavelength is 632 nm</u>

3 0

3 years ago

What is dispersion? A physics definition please.

bekas [8.4K]

In optics, dispersion is the phenomenon in which the phase velocity of a wave depends on its frequency. Media having this common property may be termed dispersive media. Sometimes the term chromatic dispersion is used for specificity.

6 0

3 years ago

A simple pendulum is displaced to the left of its equilibrium position and is released from rest. Set the origin of the coordina

guajiro [1.7K]

Answer:

a. the graph that best matches the angular position vs. time graph for the pendulum is graph F

b. the graph that best matches the velocity vs. time graph for the object is graph G

c. the graph that best matches the acceleration vs. time graph for the object is graph H

The above answers are based on the missing graphs that i attached below.

Explanation:

Check the sketched graphs for more details of answers provided.

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3 years ago