Question1
Alan leaves University of lethbridge at 8:00am to drive to AU, 650 km away. He leaves at an average speed of 100km/h. Beth leaves Lethbridge at 9:00am and drives to AU at steady speed of 120 km/h. what is right?
a) alan arrives first and has to wait 1 hour for beth
b) alan arrives first and has to wait approx. 5 minutes for beth
c) alan arrives at the similar time as beth
d) beth arrives first and waits approx. 5 minutes for alan
e) beth arrives first and waits 1 hour and 5 minutes for alan
Question2
(a)considering that coefficient of kinetic friction between rubber and dry concrete is 0.8, calculate the maximum acceleration that a car can safely have on a concrete road?
(b) Coefficient of kinetic friction for rubber on dry asphalt is 0.5. What is utmost acceleration that a car can have on this surface?
(c) Which is safer as a road material: concrete or asphalt?