Answer:
(a) 
(b) 
Explanation:
The angular speed is a measure of the rotation speed. Thus, It is defined as the angle rotated by a unit of time:
The arc length in a circle is given by:
s is the length of an arc of the circle, so 
.
Replacing (2) in (1):
a) Now, we calculate the angular speed:
b) We use (1) to calculate the time it takes to make one revolution, which means that 
is 
.
If you were able to unstrand each piece of DNA, you would see differences in time which would be labeled as "evolution"
Krypton is the least metallic. Because it is a noble gas. The elements go from left to right in order of most to least metallic. Krypton is the farthest right out of all of the elements you listed.
Answer:
Frictional force increases with the increase in the roughness of the surface.
Explanation:
You will see that the rougher the surface, the greater the wear and tear.
Answer:
Speed, v = 5 m/s
Explanation:
We have,
The length of the football field, l = 100 m
A person takes 20 seconds to run its length.
It is required to find the speed of the person with which he should run. The distance covered divided by time taken is called its velocity.
So, the speed of the person is 5 m/s.
