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Determine the magnitude of the apparent weight of a 56 kg student standing in an elevator when the elevator is experiencing an acceleration of (a) 3.2 m/s^2 downward and (b) 3.2 m/s^2 upward.
 one year ago
 one year ago
Determine the magnitude of the apparent weight of a 56 kg student standing in an elevator when the elevator is experiencing an acceleration of (a) 3.2 m/s^2 downward and (b) 3.2 m/s^2 upward.
 one year ago
 one year ago

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bahrom7893Best ResponseYou've already chosen the best response.1
W = m*a When it's going up, acceleration is: g+a, when it's going down acceleration is ga
 one year ago

bahrom7893Best ResponseYou've already chosen the best response.1
a) total a = 9.83.2 = 13 W = 56*(13)N
 one year ago

NotTimBest ResponseYou've already chosen the best response.1
You see, here's what I did for a and b.
 one year ago

bahrom7893Best ResponseYou've already chosen the best response.1
b) total a = 9.8 + 3.2 = 6.6 W = 56*(6.6)N
 one year ago

NotTimBest ResponseYou've already chosen the best response.1
a) f=ma =(56)(3.2+9.81) =728.56N
 one year ago

NotTimBest ResponseYou've already chosen the best response.1
Why is the force negative in both cases?
 one year ago

bahrom7893Best ResponseYou've already chosen the best response.1
because weight is pushing down.
 one year ago

NotTimBest ResponseYou've already chosen the best response.1
Ok. Give me a second to redo this...
 one year ago

bahrom7893Best ResponseYou've already chosen the best response.1
same thing, just change the signs
 one year ago

bahrom7893Best ResponseYou've already chosen the best response.1
you found the normal force, which has the same magnitude, but opposite direction
 one year ago

NotTimBest ResponseYou've already chosen the best response.1
And its alright if my signs are negative? Because the answers are A) 3.7*10^2N and b) 7.3*10^2N
 one year ago

bahrom7893Best ResponseYou've already chosen the best response.1
ohh yea they asked for magnitude. If they just asked for weight, ur answers wld be negative
 one year ago

bahrom7893Best ResponseYou've already chosen the best response.1
since weight has magnitude and direction. In this case it's going down, hence the negative.
 one year ago

NotTimBest ResponseYou've already chosen the best response.1
k. ill work with this. if i need help, ill call out
 one year ago

NotTimBest ResponseYou've already chosen the best response.1
the answer for A) was wrong. you probably explained this, but i forgot
 one year ago

NotTimBest ResponseYou've already chosen the best response.1
We got 728.56N. The book says 3.7*10^2N
 one year ago

bahrom7893Best ResponseYou've already chosen the best response.1
Wait in the answer, is the answer for a greater than the answer for b?
 one year ago

bahrom7893Best ResponseYou've already chosen the best response.1
A) 3.7*10^2N and b) 7.3*10^2N Aren't those the answers?
 one year ago

bahrom7893Best ResponseYou've already chosen the best response.1
oh yea.. obv. Hang on I know what we did wrong
 one year ago

NotTimBest ResponseYou've already chosen the best response.1
for A), i did this: "56)(3.29.81)
 one year ago

bahrom7893Best ResponseYou've already chosen the best response.1
well it makes sense.. i just always confuse the signs of g. g has to be positive in this case.
 one year ago

NotTimBest ResponseYou've already chosen the best response.1
would that make my value of 3.2N positive too?
 one year ago

bahrom7893Best ResponseYou've already chosen the best response.1
http://www.intuitor.com/student/elevatorrProblem.php
 one year ago

bahrom7893Best ResponseYou've already chosen the best response.1
it's the sign of g, i always get confused with it..
 one year ago

NotTimBest ResponseYou've already chosen the best response.1
am I to consider 3.2N a positive or negative force?
 one year ago

bahrom7893Best ResponseYou've already chosen the best response.1
well is it pushing down or up?
 one year ago

NotTimBest ResponseYou've already chosen the best response.1
If it was ve, it would make sense mathematically, but not in terms of real world physics(for me)
 one year ago

bahrom7893Best ResponseYou've already chosen the best response.1
then it's negative, but they're just asking for magnitude, or abs value of that force.
 one year ago

NotTimBest ResponseYou've already chosen the best response.1
ok. give me a moment to readi guess
 one year ago
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