The answer is a because it never needs to be insulated
Answer: conduction :it transfers heat between objects that are in direct contact with eachother
Answer:

West
Explanation:
m = Mass of car = 
t = Time = 9 seconds
u = Initial velocity = 30 m/s
v = Final velocity = 0
Impulse is given by

The magnitude of the total impulse applied to the car to bring it to rest is
.
The direction is towards west as the sign is negative.
Answer:2
Explanation:
Given
Velocity of bicycle is 5 m/s towards north
radius of rim 
mass of rim 
Angular momentum 


direction of Angular momentum will be towards west