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oksian1 [2.3K]
4 years ago
12

Electromagnetic waves are traveling in the vacuum of space. Calculate the wavelengths of these electromagnetic waves with the fo

llowing frequencies. (Enter the first wavelength in pm and the second wavelength in cm.)
(a) 2.00 x 1019 Hz
Physics
1 answer:
aleksley [76]4 years ago
4 0

Answer:

15 pm

Explanation:

Speed of a wave is given as:

Speed = wavelength * frequency

Since electromagnetic waves move at the speed of light, we can calculate the wavelength:

Wavelength = speed/frequency

Wavelength = (3 * 10^8)/(2 * 10^19)

Wavelength = 1.5 * 10^(-11) m

In picometre, pm, wavelength the is 15 pm.

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A force F at an angle θ above the horizontal is used to pull a heavy suitcase of weight mg a distance d along a level floor at c
Sati [7]

Answer:

option A

Explanation:

given,

Force = F

angle = θ

weight on suitcase = mg

distance = d

constant velocity so, acceleration a = 0

coefficient of friction = µ

Work done = ?

Work done is equal to force into displacement.

Friction act opposite to the force acting so, work done by frictional force will be negative.

frictional force will act into horizontal direction opposite to force.

here displacement is equal to d

now,

W = -F d cos θ

Hence,the correct answer is option A

3 0
3 years ago
(a) Check all of the following that are correct statements, where E stands for γmc2. Read each statement very carefully to make
Reil [10]

Answer:

V=9.60m/s

Attached is the solution

5 0
3 years ago
What part of the roller coaster has the lowest potential energy?
zubka84 [21]
It’s 1 that would be the lowest point potential energy
6 0
3 years ago
Kai takes a hamburger off of the grill and puts a piece of cheese on it. Explain how and why the cheese melts when Kai puts it o
Yanka [14]
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3 0
3 years ago
Read 2 more answers
A man pushing a mop across a floor causes it to undergo two displacements. The first has a magnitude of 152 om and makes an angl
aliya0001 [1]

Answer:

D₂= 167,21 cm : Magnitude  of the second displacement

β= 21.8° , countercockwise from the positive x-axis: Direction of the second displacement

Explanation:

We find the x-y components for the given vectors:

i:  unit vector in x direction

j:unit vector in y direction

D₁: Displacement Vector 1

D₂: Displacement Vector 2

R= resulta displacement vector

D₁= 152*cos110°(i)+152*sin110°(j)=-51.99i+142.83j

D₂= -D₂(i)-D₂(j)

R=  131*cos38°(i)+ 131*sin38°(j) = 103.23i+80.65j

We propose the vector equation for sum of vectors:

D₁+ D₂= R

-51.99i+142.83j+D₂x(i)-D₂y(j) = 103.23i+80.65j

-51.99i+D₂x(i)=103.23i

D₂x=103.23+51.99=155.22 cm

+142.83j-D₂y(j) =+80.65j

D₂y=142.83-80.65=62.18 cm

Magnitude and direction of the second displacement

D_{2} =\sqrt{(D_{x})^{2} +(D_{y} )^{2}  }

D_{2} =\sqrt{(155.22)^{2} +(62.18 )^{2}  }

D₂= 167.21 cm

Direction of the second displacement

\beta = tan^{-1} \frac{D_{y}}{D_{x} }

\beta = tan^{-1} \frac{62.18}{155.22 }

β= 21.8°

D₂= 167,21 cm : Magnitude  of the second displacement

β= 21.8.° , countercockwise from the positive x-axis: Direction of the second displacement

6 0
4 years ago
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