- #1
Saladsamurai
- 3,020
- 7
I am not sure why this is not clicking...
An object hangs from a spring balance. The balance registers 30 N in the air and when it is immersed in water it reads 20 N. What is the buoyant force on this object? Draw a FBD to solve this.
FBD
[tex]\uparrow F_b[/tex]
OBJECT
[tex]\downarrow F_W[/tex]
Do I need to take into account any other forces?
It is multiple choice a) 20 N up
b) 10 N up
c) 10 N down
d) 20 N down
I am pretty sure it is not c or d...as that wouldn't seem like a "buoyant" force But I am not sure how to set up my Newton's 2nd equation?
Is it just [tex]\sum F=F_{weight}-F_{buoyant}=20[/tex]
so F_buoyant=10N?
It just seems strange that we spent all day taking atmospheric pressure into account, but now we do not...
An object hangs from a spring balance. The balance registers 30 N in the air and when it is immersed in water it reads 20 N. What is the buoyant force on this object? Draw a FBD to solve this.
FBD
[tex]\uparrow F_b[/tex]
OBJECT
[tex]\downarrow F_W[/tex]
Do I need to take into account any other forces?
It is multiple choice a) 20 N up
b) 10 N up
c) 10 N down
d) 20 N down
I am pretty sure it is not c or d...as that wouldn't seem like a "buoyant" force But I am not sure how to set up my Newton's 2nd equation?
Is it just [tex]\sum F=F_{weight}-F_{buoyant}=20[/tex]
so F_buoyant=10N?
It just seems strange that we spent all day taking atmospheric pressure into account, but now we do not...
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