Q1. A car carrying a 75 kg test dummy crashes into a wall at 31 m/s and is brought to rest in 0.10 s. Find the average force exerted by the seat belt on dummy.
Q2. If a car traveling at 55 km/h will skid 24 m while its brakes lock, how far will it skid if it is traveling at 130 km/h when its brakes lock?
Q3. What is the current in amperes in the wire of radius R = 2.91 mm if the magnitude of the current density is given by (a) Ja =J0r/R and (b) Jb = J0(1 - r/R) in which r is the radial distance and J0 = 5.88 x 104 A/m2?