Why do truckers use a ramp when loading a truck if the work required is the same with or without a ramp?

Acar of mass m goes around a banked curve of radius r with speed v. if the road is frictionless due to ice, the car can still negotiate the curve if the horizontal component of the normal force on the car from the road is equal in magnitude to 101) a) mv2/r b) mg/2. d) mg e) tan[v2/(eg)]

What is created when solids,liquids,an gases mix with one another

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?