a 60kg student is standing on a scale in an elevator on Earth. What will be the reading on the scale when the elevator is
a) moving down at a constant speed?
b) at rest at a floor?
c) accelerating at 4.9m/s2 [up] ?
d) accerlering at 3.3m/s2 [down]?

Question

a 60kg student is standing on a scale in an elevator on Earth.  What will be the reading on the scale when the elevator is
a) moving down at a constant speed?
b) at rest at a floor?
c) accelerating at 4.9m/s2 [up] ?
d) accerlering at 3.3m/s2 [down]?

anonymous · Answer

@experimentX ? @mos1635 ?

anonymous · Answer

i know how to calculate a and b .. just donmt know c and d

experimentx · Answer

c) mass * (g + accn)
d) mass * (g -  accn)

mos1635 · Answer

|dw:1334527940431:dw|
at any case , reading=N=force from scale
at any case total Force=M*a
W-N=M*a (if down positive)
N-W=M*a (if up positive)
give it a shot