Medgar Evers College Department of Physics and Computer Science Physics 211-001
ID: 2029541 • Letter: M
Question
Medgar Evers College Department of Physics and Computer Science Physics 211-001 Exam #4 3/22/2018 Prof. W. Smith Answer all questions below in the exam booklet provided paper. Be neat. Show all work in order to obtain full or pa It is prohibited to use a cell-ph calculator Not on scrap oredit. partial credit one or other High-Tech device as a 1. A ball is thrown with initial velocity of 12 m/s, directed at an a with the ground. It landed in a pond a distance away a) Find the initial Vox and Voy components of the velocity b) Find the x-position and y-position of the ball 3 seconds later c) What is the maximum height achieved by the ball? d) What is the ball's range? 4 pts. 2. A projectile is shot from the edge of a building 80 m above ground level with an initial speed of 14m/s at an angle of 23 degrees with the horizontal. a) What was the initial x and y components of the velocity of the projectile? b) Find the time at which the projectile reaches the highest point. c) How high does it go above the ground level? d) Find the time taken by the projectile to hit P at ground level. t) Determine the range X of t building he projectile as measured from the base of the 5 pts 2 3 FESExplanation / Answer
1)
a) v0x = 12 cos42 = 8.92 m/s
voy = 12 sin42 = 8.03 m/s
b) t = 3s
x = voxt = 8.92*3 = 26.76m
y = voyt – ½ gt2 = (8.03)(3) – (1/2)(9.8)(3)2 = -20m
c) ymax = voy2/2g = 8.032/(2*9.8) = 3.29m
d) R = v02sin(2th)/g = 122sin(2*42)/9.8 = 14.61m