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3 years ago

Tell me about Orion nebula

1 answer:

8 0

Is the most intensely studied celestial feature. It has also help revealed much about the process of how stars and planetary systems are formed from collapsing clouds of gas and dust. It is also the closest large star-forming region to Earth. The Orion Nebula is an enormous cloud of gas and dust, is located in our galaxy (Milky Way).

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Practice: The speed of sound at sea level is normally about 340 m/s. A car honks its horn as it drives toward an observer. The f

stepan [7]

Answer:

25.5 m/s

Explanation:

The Doppler effect occurs when there is relative motion between a source of a wave and an observer. In such situation, there is a shift in the apparent frequency of the wave perceived by the observer.

The formula that gives the apparent frequency perceived by the observer is:

$f'=\frac{v\pm v_o}{v\pm v_s}f$

where

f is the real frequency of the wave

f' is the apparent frequency of the wave

v is the speed of the wave

$v_s$ is the velocity of the source (negative if the source is moving towards the observer, positive otherwise)

$v_o$ is the velocity of the observer (positive if the observer is moving towards the source, negative otherwise)

In this problem:

v = 340 m/s is the speed of sound

f = 800 Hz is the frequency of the horn

f' = 860 Hz is the apparent frequency

$v_o=0$ (the observer is at rest)

Re-arranging the equation for $v_s$ , we can find the velocity of the horn and the driver:

$f'=\frac{v}{v-v_s}f\\(v-v_s)f'=vf\\vf'-v_sf'=vf\\v_s=v\frac{f'-f}{f'}=(340)\frac{860-800}{860}=25.5 m/s$

So, 25.5 m/s towards the observer.

3 0

3 years ago

Question 5 of 10 What must be the same for two resistors that are connected in parallel?

ludmilkaskok [199]

Answer:

in parallel combination : potential difference between two terminal of resistors are always constant. ... hence, potential difference ( voltage ) must be same across each resistor .

Explanation:

3 0

3 years ago

Starting from rest, a wheel with constant angular acceleration turns through an angle of 25 rad in a time t. What will its angul

alexandr402 [8]

Answer:

θ = 225 rad

Explanation:

given data

angle = 25 rad

to find out

angular velocity after 3t?

solution

let angular acceleration α in t

θ = ω × t + 0.5 × α × t² ........................1

here ω = 0 (initial velocity )

so put this value here

25 = 0 + 0.5 × α × t² ..........................2

α = 25 ÷ (0.5 t²)

α = 50 ÷ t² .........................3

now here we take in 3t

θ = ω × 3t + 0.5 × α × (3t)²

for ω = 0

θ = 0 + 0.5 × α × 9t²

now put value in eq 2

θ = (0.5) × (50 ÷ t²) × (3t)²

θ = 25 × 9

θ = 225 rad

6 0

2 years ago

An object is placed 100 cm in front of a diverging lens of focal length -25cm. A converging lens of focal length 33 1/3 cm is pl

bagirrra123 [75]

We use 1/o + 1/i = 1/f where o is the distance of the object, i as distance of the image and f is the focal length.
Substituting, 1/ 100 + 1 / i = - 1 /25 
i = - 20 cm 

For the case of the problem,

o = (20 + 30) = 50 cm 

f = 33.33. Using 1 / i + 1 / o = 1/f , i = 100 cm 

M = magnification = - i / o 

m1 = -(-20)/100 = 20/100 = 0.2 

m2 = -100/50 = -2 

M = m1*m2 = -2 x 0.2 = -0.4.

8 0

3 years ago

What are some physical activities you can do at home to help you with arm strength , as well as

Bond [772]

Answer:

See the explanation below

Explanation:

To improve the strength in the arms can be performed arm push-ups, there are different variants for this exercise. But ideally, perform the known basic exercise, try to touch with the chest the floor and then rise up to the length of the arms using the strength of these. It will be necessary for beginners to perform a routine of 3 sets to 10 repetitions. Rest one day. In the third week you can perform 4 sets to 25 repetitions, resting only one day. This will improve the strength in the arms considerably.

For the legs should stimulate the muscle of the quadriceps, should perform an exercise known as squat, to perform it should be lowered with your back straight until the knees form an angle of 90 degrees, for beginners should perform 3 sets of 15 repetitions a day, resting only one day. In the second week you can perform 4 sets of 25 repetitions a day, resting one day a week.

6 0

3 years ago