<span>Use s = ut + 1/2 at^2, so
s = 0 + 1/2 x20 x 1.8 x 1.8
s = 32.4 m.</span>
There are things like comets, asteroids, meteoroids, satellites, planets, etc. move around the sun.
Explanation:
- The solar system is made up of not only planets and its satellites, but there are also other things which move around the sun.
- Those are like comets, asteroids, and meteoroids.
- Asteroids are also called mini planets, there are bigger ones too and they are called planetoids. The orbit the sun in their belt called asteroid belt situated in between the orbits of Mars and Jupiter.
- Comets appear like snowballs which contain frozen gases, dust and rock which orbits the sun.
- Meteoroids are the metallic or rocky body found the outer space. It is smaller than the asteroids and micro-scale meteoroids are the space dust.
C. Use Coulomb's law F=kq1q2/r^2, where q1 and q2 are the two charges, and r is the distance between the two. Plug in q1=0.0072 C, q2=-0.0060 C, r=0.0040 m, k is the constant 9*10^9 N, F=-2.4*10^10 N, so the answer is C.
Best Answer: You need a reference point because all motion is defined relative to a point which is taken to be fixed. For example, when you say that a car is moving at 20 m/s, you mean that it's moving at 20 m/s relative to the ground, which you assume to be a fixed point. However, you also know that the ground (and the Earth) are really zipping through space at high speed as we orbit the Sun. If you want to define the car's speed relative to the Sun, you have to take the Earth's motion into account as well. Whenever you define the motion of an object on or above Earth, it's usually understood that the ground if your reference point. If it's not, you should specify another point.
Speed is a scalar quantity, which means that it only tells you how fast an object is moving. Velocity is a vector quantity: it tells you how fast an object is moving AND in what direction. For example, I might say that a car is moving at 20 m/s. That's the car's speed. But if I say that the car is moving at 20 m/s NORTH, then I've given you its velocity.
In velocities, direction can be given in several different ways:
(A) As a positive or negative sign. Example: The rocket is moving at +250 m/s. In this case, we've defined "up" as the positive direction and "down" as the negative direction.
(B) As an angle or compass heading. Example: The plane took off at 100 m/s 20º above the horizontal OR the car is driving at 30 m/s due west.
Answer:
emission line or absorption line
Explanation:
A spectral line is uniform bands of bright and dark fringes. visible spectrum are just due to string spectral line which is unique for a different element.
when there is the transmission of an electron from one energy to another ( higher to lower energy level), there is the emission of photons that lead to emission-line on the spectrum while on the other side, the absorption line is formed when electron moves to the next level by absorbing electron.