16) Durig a lecture demonstration, a professor places two coins on the edge of a
ID: 1406878 • Letter: 1
Question
16) Durig a lecture demonstration, a professor places two coins on the edge of a table. she then flicks one of the coins horizontally off the table, simultaneously nudging the other over the edge. Describe the subsequent motion of the two coins, in particular discussing whether they hit the floor at the same time.
25) A projectile is launched at ground level with an initial speed of 50.0m/s at an angle of 30 oC above the horizontal . it strikes a target above the ground 3.00 seconds later. what are the x and y distance from where the projectile was launched to where it lands?
Explanation / Answer
16)
for the horizantal coin
in horizantal
vox = v
x = vox*t
t = x/v
in vertical direction
voy = 0
a = -g
y = -h
from equations of motion
y = voy*t + 0.5*a*t^2
y = (a/2v^2)x^2
the path is parabola
if the coin touches ground after T time
y = -h
a = -g
T = sqrt(2h/g)
for other coin
voy = 0
a = -g
y = -h
from equations of motion
y = voy*t + 0.5*a*t^2
-h = 0 - 0.5*g*t^2
path is a straight line
T = sqrt(2h/g)
both will reach at the same time
++++++++++++
25)
along horizantal
vx = v*cos30 = 50*cos30
x = vx*T = 50*cos30*3 = 130 m
y = voy^T + 0.5*g*T^2
y = v*sin30*T - 0.5*g*T^2
y = (50*sin30*3)-(0.5*9.8*3^2)
y = 31 m
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.