Answer:
Because they are too small
Explanation:
The radius of the Earth is approximately 6370 km. This means that distances between farther places in the Earth, e.g. between two cities, is usually measured using the kilometer. Shorter distances are even measured using the metre.
On the contrary, distances in space are much, much greater. For example, the average distance between the Earth and the Sun is approximately 150 million kilometers, which means . For farther objects, it is even unpractical to measure the distance in million km. For example, the closest star to the Sun, Proxima Centauri, is 4.2 light-years from us (the light-year is the distance covered by the light in one year: 1 light year is equivalent to ).
More distant objects, such as galaxies, are even measured using another unit, the parsec: 1 parsec (1 pc) corresponds to .
Answer:
In second time period will be
Explanation:
We have given the time period of wave
We have to change this time period in unit of second
We know that 1 micro sec
We have to change 1.4 micro second
To change the time period from micro second to second we have to multiply with
So
Answer:
Its speed decreases.
Explanation:
When light enters into water, its speed decreases (as well as its frequency). This is the reason why refraction (the bending of light when it changes media) occurs.
This can be proven mathematically.
Given that the refractive index of water is 4/3, we know that refractive index is the ratio of the speed of light in a vacuum to the speed of light in another medium.
Therefore,
4/3 = (speed of light in vacuum) / (speed of light in water)
Speed of light in a vacuum is 3 * 10^8. Hence,
Speed of light in water is:
v = (3 * 10^8) / (4/3)
v = 2.25 * 10^8 m/s
As we can see, the speed of light decreases in water.
Answer:
x -component of dog's velocity = 8.265m/s
y- component of dog's velocity = 1.389m/s
Explanation:
The detailed and step by step calculation is as shown in the attached file.
Answer:
0.015m^3
Explanation:
1 m^3 = 1000 liters
x m^3 = 15 liters
Cross multiply
xm^3 x 1000 l = 15 l
Divide both sides by 1000
xm^3 x1000/1000 = 15/1000
xm^3 = 0.015m^3
Therefore 15 liter = 0.015m^3