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sineoko [7]
3 years ago
7

Help pls☹️☹️☹️☹️☹️ anyone

Physics
1 answer:
mario62 [17]3 years ago
7 0
2a) the first sound he hears was travelling through the metal pipe (sound travels faster in solids) while the second sound he hears traveled through the air.

2b) The pipe is 330m/s * 1s = 330m.
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Describe succinctly the relationship between how far a galaxy is from us (its distance), versus how fast it is moving.
Eva8 [605]

Answer:

Distance is directly proportional to the velocity

Explanation:

In 1929, Edwin Hubble's wrote an article that talked about relationship between the distance and recession speed/velocity of galaxies which led to what is known as the Hubble Law. This law states that galaxies are moving away from the earth at velocities proportional to their distances.

Thus is written as;

v = H_o•d

Where;

v is velocity

d is distance

H_o is Hubble's constant rate of cosmic expansion.

He came to this conclusion by generating a graph known as Hubble's classic graph which was a graph of observed velocity vs distance for nearby galaxies.

7 0
3 years ago
How do you calculate the resultant velocity of the object in this image?<br> ​
alexgriva [62]

Answer:

the resultant velocity is Zero

Explanation:

by the rule of adding and subtracting factors, we know that; when the force acting on an object is from east & north we add and with forces acting from South & west we minus.

Therefore:

1) List the forces down:

the 100m/s acting west is (-) while

the other 100m/s is acting in easterly direction

so it is (+)

2) Add the forces:

-100+100=0

therefore the answer is 0m/s for the the resultant velocity

hope I'm right

4 0
2 years ago
A diver shines a flashlight upward from beneath the water (n=1.33) at a 36.2° angle to the vertical. At what angle does the ligh
horrorfan [7]

Answer:

The flashlight leaves the water at an angle of 51.77°.

Explanation:

if n1 = 1.33 is the refractive index of water and ∅1 is the angle at which the flashlight shine beneath the water, and n2 = 1.0 is the refractive index of air and ∅2 is the angle the flashlight leaves the water.

Then, according to Snell's law :

n1×sin(∅1) = n2×sin(∅2)

sin(∅2) = n1×sin(∅1)/n2

           = (1.33)×sin(36.2)/(1.0)

           = 0.7855055×379

     ∅2 = 51.77°

Therefore, the flashlight leaves the water at an angle of 51.77°.

7 0
3 years ago
When you ride your bike around a corner at 10 m/s, you are accelerating?
WINSTONCH [101]

When you ride your bike around a corner at 10 m/s, you are accelerating. Acceleration is caused by any forces. Sliding friction keeps you in the seat when a car goes around a corner. If you throw a ball into the air, Earth exerts a force on the ball.

5 0
3 years ago
Read 2 more answers
1. Three vehicles are traveling at the same speed in the same direction on a 1 point
rusak2 [61]

9514 1404 393

Answer:

  The front of the black car

Explanation:

The position -21 is shown on the diagram at the front of the white van. The reference point is the position 0, which is shown on the diagram as the front of the black car.

4 0
3 years ago
Read 2 more answers
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