A point charge +q of mass m is moving through a region of constant electrical potential V1 with total energy E1. It then crosses an interface and enters a region of electrical potential V2< V1. a) Find the angle φ2as a function of φ1, E1, V1andV2. You may safely neglect anything that happens while crossing the interface. b) What kind of boundary could produce this situation

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min

im srry but ur wrong the answer is d a smooth rock, some red dirt, and an empty bird's nest.