Question

1. Mountain roads often have switchbacks, a road weaving back and forth across the face of a mountain slope, so that on any portion of the road there is usually only a gentle incline. Why are these switchbacks used? Do switchbacks require less work for an automobile climbing the mountain than if the automobile went straight up a mountain slope? Does the answer depend on the frictional force on the car’s tires?

2. A 5.0 kilogram rifle fires a bullet with a mass of 20.0 gram (0.0200 kg). The bullet’s speed is 300 meters/second after the gun is fired.

a) What is the bullet’s momentum after the rifle is fired? b) If external forces on the rifle can be ignored, what is the recoil velocity of the rifle?

Answer 1

reuse& toaoid kding on witchbnck oads have Keep qn cad olen Switd back ronds inelingHion the3lote hene we Smawhich Swilchbaok becayse Worrk done дuo on thuse ads don oe is larze on dislana incrasetherfope. yo hove to wonk mare mone is also Wohk done= 7 pviction for ca answas 27 CfomatAm — 0-02х380 a) 4maman Caseavt MUA 02 3o-0 ANO 1-2