1. sketch position-versus-time graphs (x versus i or/versus t) for the following motions.
include appropriate numerical scales along both axes. a small amount of computation
may be necessary.

a. a parachutist opens her parachute at an altitude of 1500 m. she then descends slowly to earth at a steady speed of5 m/s. start your graph as her parachute opens.

b. trucker bob starts the day 120 miles west of denver. he drives east for 3 hours at a
steady 60 miles/hour before stopping for his coffee break. let denver be located at x = 0
mi and assume that the x-axis points to the east.

c) quarterback bill throws the ball to the right at a speed of 15 m/s. it is intercepted 45 m
vay by carlos, who is running to the left at7.5 mls. carlos carries the ball 60 m to
ore. let. r = 0 m be the point where bill throws the ball. draw the graph for the football.

To understand the electric potential and electric field of a point charge in three dimensions consider a positive point charge q, located at the origin of three-dimensional space. throughout this problem, use k in place of 14? ? 0. part adue to symmetry, the electric field of a point charge at the origin must point from the origin.answer in one word.part bfind e(r), the magnitude of the electric field at distance r from the point charge q.express your answer in terms of r, k, and q. part cfind v(r), the electric potential at distance rfrom the point charge q.express your answer in terms of r, k, and q part dwhich of the following is the correct relationship between the magnitude of a radial electric field and its associated electric potential ? more than one answer may be correct for the particular case of a point charge at the origin, but you should choose the correct general relationship. a)e(r)=dv(r)drb)e(r)=v(r)rc)e(r)=? dv(r)drd)e(r)=? v(r)r

During a car accident, a 125kg driver is moving at 31m/s and in 1.5s is brought to rest by an inflating air bag. what is the magnitude of the change in momentum to the driver

Acharge q experiences no net force at a particular point in space. which of the following situations described below must always be true? -there are no other charges nearby. -if there are other charges nearby, they must all have the same sign as q. -if there are other charges nearby, they must all have the opposite sign of q. -if there are other charges nearby, the total positive charge must equal the total negative charge. -none of the above