1) In an accelerated physics clas, student #1 climbs a ladder and drops a steel ball from the ceiling. Srudent #2, using a stopwathc, times the fall of the ball fro mthe ceiling to the flor with a time of 1.5 s. What is the height of the room?
My answer : x = 0(1.5) + 1.5^2(9.8)/2-----> [11.025 m]
2) A woman is reported to have fallen 44 m from the 17th floor and to have landed on a metal ventilator box, crushing it 46 cm.
a)What is the velocity of the woman before she collids with the box?
b) What is the acceleration or deceleration while in contact with the box?
c) How long did it take her to crush the box?
My answer : (a) Vf^2 = 9.8(2)(44)------>862.4---->[Vf = 29.36 m/s]
(b) ???????
(c) -29.36^2 + 2(a)(46)------> [a = -9.37]
0 = 29.36 + -9.36 (t)------> [3.13 s]
2006-10-27 04:22:15 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Physics
1. 11.02m is correct.
2a. 29.36m/s is correct.
2b. v^2-u^2=2as
0-29.36^2=2a*46/100 (convert 46cm to meters)
-862=0.92a
a=-862/0.92=-937m/s^2
2c. v=u+at
0=29.36+(-937)t
937t=29.36
t=29.36/937
=0.03s
d. What happened to the woman? Ihope she survived the fall.
2006-10-27 04:53:33 · answer #1 · answered by tul b 3 · 0⤊ 0⤋
The previous answers (esp. tul b) appear to be correct, but they seem incomplete IMHO because the operative words "is" and "did" were used in each of the questions, thus implying a basis in reality.
In reality, air friction would slow the rate of fall. She would probably hit with some cushion (fat), and bounce a few times, thus significantly altering the acceleration.
2006-10-27 14:13:17 · answer #2 · answered by Andy 4 · 0⤊ 0⤋
You should also have a question asking when the women died. What a ridiculous thing to ask in physics. Just goes to show that science has no morals.
2006-10-27 11:26:10 · answer #3 · answered by sangheilizim 4 · 0⤊ 0⤋