To meet a u. s. postal service requirement, footwear must have a coefficient of static friction of 0.5 or more on a specified tile surface. a typical athletic shoe has a coefficient of 0.800. in an emergency, what is the minimum time interval in which a person starting from rest can move 3.00 m on a tile surface if she is wearing (a) footwear meeting the postal service minimum? (b) a typical athletic shoe?

a) t = 1.905s

b) t = 0.866s

Explanation:

From a force diagram we know that:

Ff = m*a   where Ff = μ*N

For Postal Service shoes:

The time interval is calculated as:

  where Vo=0; X = 3m.  Solving for t:

For Athletic shoes:

Using the same formula for the time interval:

a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)

ice to water 1 water to vapour 2 latent heat