Small enterprises who manufacture goods or services with the help of relatively smaller machines and a few workers and employees
Answer: 
Explanation:
Given
Length of the race track 
the radius of curvature of the track 
time taken to run on track is 
Speed of runner is

Centripetal acceleration is

From the items on that particular list, the longest waves are radio waves.
Answer:20 mph
Explanation:
Given
distance between college to Tyrone=20 miles
Given professor drives with a velocity of 60 mph
he returns to college after reaching tyrone and then again drive to tyrone.
so his net displacement is 20 miles
time taken to cover 20 miles is
hr
average velocity


C.Earth is the largest and most dense of the terrestrial planets