physics
posted by johnny .
An object is hung from a spring balance attached to the ceiling of an elevator cab. The balance reads 60 N when the elevator is standing still.
(a) What is the reading when the elevator is moving upward with a constant speed of 9.6 m/s?
N
(b) What is the reading when the elevator is moving upward with a speed of 9.6 m/s while decelerating at a rate of 1.9 m/s2?
N

a) F=ma+mg so if a is zero, ...
b)same formula. 
3.4 N

i am afraid
Respond to this Question
Similar Questions

Algebrabased Physics
A large fish hangs from a spring balance supported from the roof of an elevator. If the elevator has an upward acceleration of 2.65 m/s^2 and the balance reads 70.0 N, what is the true weight of the fish? 
Physics
*I really don't know how to get started. I have done lots of the homework, but this one (and a couple of others) are really giving me PROBLEMS.* A large fish hangs from a spring balance supported fromthe roof of an elevator. If the … 
Physics
A spring (k = 857 N/m) is hanging from the ceiling of an elevator, and a 5.9 kg object is attached to the lower end. By how much does the spring stretch (relative to its unstrained length) when the elevator is accelerating upward at … 
Physics
A man measures the acceleration of an elevator using a spring balance. He fastens the scale to the roof, and suspends a mass from it. If the scale reads 98N when the elevator is at rest, and 93N when the elevator is moving. a) what … 
Physics
A man measures the acceleration of an elevator using a spring balance. He fastens the scale to the roof, and suspends a mass from it. If the scale reads 98N when the elevator is at rest, and 93N when the elevator is moving, (a) what … 
physics
A large fish hangs from a spring balance supported from the roof of an elevator. If the elevator has an upward acceleration of 2.85m/s^2 and the balance reads 60.0N , what is the true weight of the fish? 
science
Suppose you hang an object of weight W by a string from a hanging spring scale, such as the kind used in some grocery stores. You then hang the scale with the object from the ceiling of an elevator. When the elevator is standing still, … 
physics
A spring (k = 905 N/m) is hanging from the ceiling of an elevator, and a 4.8kg object is attached to the lower end. By how much does the spring stretch (relative to its unstrained length) when the elevator is accelerating upward at … 
phy
A body hangs from a spring balance supported from the roof of an elevator. If the elevator has an upward acceleration of 3ms−2 and the balance reads 50 N, what is the true weight of the body? 
physics
a 75kg person is standing on a scale in an elevator, the scale gives a readout in newtons(you have to use a free body diagram)determine the reading on the scale in newtons in each of the following situations, when the elevator is not …