- #1
davedays
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Homework Statement
A man of mass 70 kg stands in a lift on a set of weighing scales. The scales are calibrated in Newtons. Assuming that g=10N kg -1
What weight will the scales register when the :
a) lift is static
b)lift accelerates down at 10 ms-2
c)lift accelerates up at 10 ms-2
Homework Equations
F=ma
The Attempt at a Solution
a)
F=ma
F= 70 x 0
F=70
b) accelerates down at 10ms -2
F=ma
F=70 /10
F=7
70-7=63
c) accelerates up at 10 ms -2
70 + 7 = 77
Is this correct ?
Thanks,
dave