Answer:
linear expansitivity is defined as the fractional increase in length per unit ,length per degree rise in temperature
Explanation:
Answer:

Explanation:
Given:
- un-stretched length of the spring,

- speed of revolution of the ball in horizontal plane,

- length stretch during the motion,

<u>Now the radius of revolution of the ball:</u>



<u>Now in this case the centrifugal force is equal to the spring force:</u>


where:
m = mass of the ball
k = spring constant


<u>Now the extension in the spring upon hanging the ball motionless:</u>



Answer:
B
Explanation:
momentum = mass (kg) x velocity (m/s²)
Its rays point away from the charge
Answer:
A) If you look at the vertical rows you can tell how many electrons there are on the outer shell eg. Group 7 (eg. nitrogen) has 7 electrons on its outer shell
B) They are in the same group
C) Helium,Argon and Organessom are all Nobel gasses