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Sindrei [870]
3 years ago
8

1-4 help pls if u know it

Physics
1 answer:
jeyben [28]3 years ago
7 0

Answer:

c,B,a,d i guess i m not sure it is the guessing

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A rectangular painting measures 1.0 m tall along the y' axis and 3.0 m wide along the
Gennadij [26K]

Answer:

a) 1 m tall, 3 m wide

b) 1 m tall, 1.31 m wide

Explanation:

According to the captain of the spaceship, the dimensions of the picture is the same i.e 1.0 m tall along the y' axis and 3.0 m wide along the x' axis.

b) The dimensions of the picture as seen by an observer on the Earth along the y axis will remain the same, 1.0 m tall, for the direction of the y axis is perpendicular to the spaceship movement.

The dimensions of the picture as seen by an observer on the Earth along the x axis will reduce if we are to go by the Lorentz contraction:

L(x) = L(x)' * √[1 - (v²/c²)]

where

L(x)' = the dimensions of the picture along the x axis on the spaceship,

v² = the speed of the spaceship and c² = the speed of light in the vacuum.

On substituting, we have

L(x) = 3 * √[1 - (0.81c²/c²)]

L(x) = 1.31 m

8 0
4 years ago
I am starting a PowerPoint presentation about Cat-Eye Syndrome. I don't know how to start my sentence. How can I start?
ioda

Answer:

first introduce what is cat-eye syndrome e.g cat eye syndrome is....

then write about the causes and symptoms of cat eye syndrome

8 0
3 years ago
How does energy relate to force?
ioda

Answer:work is force times distance

Explanation:to create a force u need energy and the greater the energy the greater the force is applied to an object.

4 0
3 years ago
A book falls off the desk and makes a sound when it hits the floor. The sound wave that travels through the air is
Andreas93 [3]

The sound wave that travel through the are is called the <em>amplitude</em> or <em>frequency you can use either of them because there both correct.</em>

6 0
4 years ago
Read 2 more answers
For what frequencies does their sound at the speakers produce constructive interference?
valentinak56 [21]
 <span>You need to find the path difference. That is, how much further must sound waves from the more distant speaker travel than the close speaker, to reach the mike. 
Use Pythagoras to find the distance of the further speaker: it is √(2.00²+4.50²)=4.924m so the path difference is 4.924-4.50=0.424m. 
You will get constructive interference when this path difference is an integer number of wavelengths, because the waves will arrive at the mike in phase. 
The speed of sound is 340m/s so the lowest frequency that will produce an antinode at the mike is the one that makes 0.424=λ 
v=fλ so f=v/λ 
f=340/0.424=801Hz. 
The next one will be when 0.424m = 2λ => λ=0.212m 
f=340/0.212=1602Hz 
and so-on according to f=340n/0.424 where n is an integer. 

For destructive interference the path difference must be (n-½)λ because that will make the waves arrive at the mike 180° out of phase. 
f=340(n-½)/0.424</span>
5 0
3 years ago
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