- #1
nguyentech
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This question has been troubling me... :
A physics teacher decides to use bathroom scales (calibrated in Newtons) in an elevator. The scales provide a measure of the force with which they push up on the teacher. When the lift is stationary the reading on the bathroom scales is 823 N. What will be the reading on the scales when the elevator is:
a) moving upwards at a constant speed of 2.0 m/s/s
b) accelerating downwards at 2.0 m/s/s
c) accelerating upwards at 2.0 m/s/s
The apparent answers at the back of the textbook read:
a) 700 N
b) 5.6 x 10^2 N
c) 8.4 x 10^2 N
I think they are wrong?
My answers are:
a) 823 N
b) 655 N
c) 991 N
Are my answers correct?
A physics teacher decides to use bathroom scales (calibrated in Newtons) in an elevator. The scales provide a measure of the force with which they push up on the teacher. When the lift is stationary the reading on the bathroom scales is 823 N. What will be the reading on the scales when the elevator is:
a) moving upwards at a constant speed of 2.0 m/s/s
b) accelerating downwards at 2.0 m/s/s
c) accelerating upwards at 2.0 m/s/s
The apparent answers at the back of the textbook read:
a) 700 N
b) 5.6 x 10^2 N
c) 8.4 x 10^2 N
I think they are wrong?
My answers are:
a) 823 N
b) 655 N
c) 991 N
Are my answers correct?