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 2 years 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.
 2 years 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.

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bahrom7893
 2 years ago
Best ResponseYou've already chosen the best response.1W = m*a When it's going up, acceleration is: g+a, when it's going down acceleration is ga

bahrom7893
 2 years ago
Best ResponseYou've already chosen the best response.1a) total a = 9.83.2 = 13 W = 56*(13)N

NotTim
 2 years ago
Best ResponseYou've already chosen the best response.1You see, here's what I did for a and b.

bahrom7893
 2 years ago
Best ResponseYou've already chosen the best response.1b) total a = 9.8 + 3.2 = 6.6 W = 56*(6.6)N

NotTim
 2 years ago
Best ResponseYou've already chosen the best response.1a) f=ma =(56)(3.2+9.81) =728.56N

NotTim
 2 years ago
Best ResponseYou've already chosen the best response.1Why is the force negative in both cases?

bahrom7893
 2 years ago
Best ResponseYou've already chosen the best response.1because weight is pushing down.

NotTim
 2 years ago
Best ResponseYou've already chosen the best response.1Ok. Give me a second to redo this...

bahrom7893
 2 years ago
Best ResponseYou've already chosen the best response.1same thing, just change the signs

bahrom7893
 2 years ago
Best ResponseYou've already chosen the best response.1you found the normal force, which has the same magnitude, but opposite direction

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

bahrom7893
 2 years ago
Best ResponseYou've already chosen the best response.1ohh yea they asked for magnitude. If they just asked for weight, ur answers wld be negative

bahrom7893
 2 years ago
Best ResponseYou've already chosen the best response.1since weight has magnitude and direction. In this case it's going down, hence the negative.

NotTim
 2 years ago
Best ResponseYou've already chosen the best response.1k. ill work with this. if i need help, ill call out

NotTim
 2 years ago
Best ResponseYou've already chosen the best response.1the answer for A) was wrong. you probably explained this, but i forgot

NotTim
 2 years ago
Best ResponseYou've already chosen the best response.1We got 728.56N. The book says 3.7*10^2N

bahrom7893
 2 years ago
Best ResponseYou've already chosen the best response.1Wait in the answer, is the answer for a greater than the answer for b?

bahrom7893
 2 years ago
Best ResponseYou've already chosen the best response.1A) 3.7*10^2N and b) 7.3*10^2N Aren't those the answers?

bahrom7893
 2 years ago
Best ResponseYou've already chosen the best response.1oh yea.. obv. Hang on I know what we did wrong

NotTim
 2 years ago
Best ResponseYou've already chosen the best response.1for A), i did this: "56)(3.29.81)

bahrom7893
 2 years ago
Best ResponseYou've already chosen the best response.1well it makes sense.. i just always confuse the signs of g. g has to be positive in this case.

NotTim
 2 years ago
Best ResponseYou've already chosen the best response.1would that make my value of 3.2N positive too?

bahrom7893
 2 years ago
Best ResponseYou've already chosen the best response.1it's the sign of g, i always get confused with it..

NotTim
 2 years ago
Best ResponseYou've already chosen the best response.1am I to consider 3.2N a positive or negative force?

bahrom7893
 2 years ago
Best ResponseYou've already chosen the best response.1well is it pushing down or up?

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

bahrom7893
 2 years ago
Best ResponseYou've already chosen the best response.1then it's negative, but they're just asking for magnitude, or abs value of that force.

NotTim
 2 years ago
Best ResponseYou've already chosen the best response.1ok. give me a moment to readi guess
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