All categories

2 years ago

The Sun is a star that is in a stable state called the main sequence.

1 answer:

5 0

Astronomers believe some stars are moving away from earth by measuring the extent to which their light is “stretched” into the red part of the color spectrum, representing the lower frequencies on that spectrum.

In short, stars moving away from earth are “red-shift”, while if they were moving towards the earth they would take on a “blue-shift”.

You might be interested in

jaka siła pełni rolę siły dośrodkowej w przypadku krzesełka kręcocego się na karuzeli przy akrobacji lotniczych

Tamiku [17]

Answer:

What??? Not English..

Explanation:

3 0

3 years ago

The net force on an object is 200 N. The object accelerates at 10 m/s? What is the mass of the object ?

geniusboy [140]

Answer:

F=200 N

a=10m/s2

F=ma

m=F/a=200/10=20m

Explanation:

3 0

3 years ago

An object of mass 9.00 kg attached to an ideal massless spring is pulled with a steady horizontal force across a frictionless le

frosja888 [35]

Answer:

Acceleration of the object will be $1.05m/sec^2$

Explanation:

We have given mass of the object m = 9 kg

spring constant k = 95 N/m

Spring is stretched by 10 cm

So x = 10 cm = 0.1 m

We know that force is given by $F=kx=95\times 0.1=9.5N$

From newton's law we also know that force is given by

F = ma , here m is mass and a is acceleration

So $9.5=9\times a$

$a=1.05m/sec^2$

5 0

3 years ago

How long will it take for a sound impulse to travel through a copper rod 25 kilometers long?

jekas [21]

By conducting exhaustive, high-intensity online research for about 15 seconds, I found a source that says the speed of sound in copper is 4600 m/s. (You could easily have completed the same research project in about 1/3 of the time it took you to type and post the question here.)

Time it takes = (distance) / (speed)

Time = (25,000 meters) / (4600 m/s)

Time = (25 / 4.6) km-sec/km

<em>Time = 5.43 seconds </em>

4 0

3 years ago

A car starts to move from rest and covers a distance of 360m in one minute. Calculate the acceleration of the car.

Romashka-Z-Leto [24]

<h2>The acceleration of car is 0.2 ms⁻²</h2>

Explanation:

When the car moves , the distance covered is calculated by the relation

S = u t + $\frac{1}{2}$ a t²

In this question u = 0 , because car was at rest initially

Thus S = $\frac{1}{2}$ a t²

here S is displacement and a is the acceleration of car

Therefore 360 = $\frac{1}{2}$ a ( 60 )²

Because time taken is one minute or 60 seconds

Therefore a = $\frac{360x2}{3600}$

or a = 0.2 m s⁻²

4 0

3 years ago