- #1
manal950
- 177
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1 ) A wheel is making 240 rpm and after 30 sec and after 30 sec it is running at 150 rpm .
A) Find the time elapse before it stops if the retardation is uniform ?
B) Find the time elapse after it stops if the retardation is uniform ?
my answer :
w0 = 240 rpm = 8Pi rad/s
w = 240 rpm = 5pi rad/s
t = 30
------
w = w0 + at
a = -0.1Pi
time elapse before it stops
w = w0 + at
5pi = 8Pi - 0.1Pi (t)
t = 94.4 s
time elapse after it stops
w = w0 + at
5pi = 0 - 0.1Pi (t)
t = 50 s
A) Find the time elapse before it stops if the retardation is uniform ?
B) Find the time elapse after it stops if the retardation is uniform ?
my answer :
w0 = 240 rpm = 8Pi rad/s
w = 240 rpm = 5pi rad/s
t = 30
------
w = w0 + at
a = -0.1Pi
time elapse before it stops
w = w0 + at
5pi = 8Pi - 0.1Pi (t)
t = 94.4 s
time elapse after it stops
w = w0 + at
5pi = 0 - 0.1Pi (t)
t = 50 s