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Alex73 [517]
3 years ago
10

According to science, the fastest speed possible for anything is the speed of light. The speed of light is about 186,000 miles p

er second. That means that in one minute, light travels 11,160,000 miles. The star nearest Earth is the Sun. It's about 93,000,000 miles from Earth. Therefore, it takes sunlight about eight minutes to travel to Earth. So, when you see the Sun, you aren't seeing it as it is. You're seeing it as it was eight minutes ago. Since the stars are much farther away than our ...
Physics
1 answer:
Schach [20]3 years ago
6 0
Yes, yes, go on !  The nearest star to us that's outside of our solar system
is 4.2 light years away.  So when we see that star, we're not seeing it as
it is, we're seeing it as it was 4.2 years ago.  And all of the other stars
are much farther away from us than that one is.  We have detected
galaxies that we're not seeing as they are now, we're seeing them as
they were 13 billion years ago !

The moon is about 240,000 miles away from us.  When we look at the
moon, we're not seeing it as it is, we're seeing it as it was 1.3 seconds ago.

The refrigerator in your kitchen is about 12 feet from you.  So when you
look at the refrigerator, you're not seeing it as it is.  You're seeing it as it
was 0.0000000122 second ago.

It takes TIME for light to travel from one place to another.
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A professional racecar driver buys a car that can accelerate at 5.9 m/s2. The racer decides to race against another driver in a
3241004551 [841]

Answer:

(a) Time will be t = 3.56 sec

(b) Distance traveled by car when they are side by side is 37.38712 m

(b) Velocity of race car = 21.004 m/sec

velocity of stock car = 12.816 m/sec            

Explanation:

We have given acceleration of the car a_1=5.9m/sec^2

Acceleration of the stock car a_2=3.6m/sec^2

When 1st car overtakes the second car then distance traveled by both the car will be same

(a) So s_1=s_2

As both car starts from rest so initial velocity of both car will be 0 m/sec

It is given that stock car leaves 1 sec before

So \frac{1}{2}\times 5.9\times t^2=\frac{1}{2}\times (t+1)^2\times 3.6

After solving t = 3.56 sec

(b) From second equation of motion s=ut+\frac{1}{2}at^2=0\times 3.56+\frac{1}{2}\times 5.9\times 3.56^2=37.38712m

(c) From first equation pf motion v = u+at

So velocity of race car v = 0+5.9×3.56 = 21.004 m/sec

Velocity of stock car v = 0+ 3.6×3.56 = 12.816 m/sec

3 0
3 years ago
5.0 Points The blue color of the sky is the result of
mina [271]

The blue color of the sky is the result of scattering. The answer is letter B. it is specifically called the Rayleigh scattering. This blue color is the result of the incoming rays of the Sun into the earth’s atmosphere. It has he lowest wavelength which as we all see is the blue spectrum of light.

7 0
3 years ago
A rock is dropped off a cliff and falls the first half of the distance to the ground in 2.0 seconds. how long will it take to fa
son4ous [18]

Answer:

The answer is 0.83 seconds.

Explanation:

The formula of free fall is following:

h=1/2*g*t^2

Where g=9.8 m/s^2 and t=2 seconds, the rock takes:

h=1/2*9.8*2^2=19.6

19.6 meters. This is the half distance of the cliff. The whole distance is 39.2 meters. So it takes:

39.2=1/2*9.8*t^2\\t^2=8\\t=2.83

2.83 second to fall down completely. The rock takes the second half of the cliff in 0.83 seconds

8 0
4 years ago
The cable holding a 2125 kg elevator has a maximum strength of 21,750 N. What is the maximum upward acceleration the cable can g
vivado [14]

Answer:

10.23m/s^2

Explanation:

GIven data

mass of elevator = 2125 kg

Force= 21,750 N

Required

The maximum acceleration upward

F= ma

a= F/m

a=21,750/2125

a= 10.23m/s^2

Hence the acceleration is 10.23m/s^2

4 0
3 years ago
A car with a mass of 1,500 kg is accelerating at a rate of
AURORKA [14]

Answer:

The net force acting on the car is

3

×

10

3

Newtons.

Hope this helps you

Explanation:

Force is defined as the product of the mass of the body and its aaceleration,

⇒

F

=

m

a

Substituting the above given values we get,

F

=

(

1500

k

g

)

(

2.0

m

/

s

2

)

=

3000

N

=

3

×

10

3

N

.

4 0
3 years ago
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