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Unformatted text preview: PHY231 Spring 2013 Section 2 11. A balloon inflated with a gas (density = 0.5 kg/m3) has a volume of 6.00 × 10–3 m3. If
the buoyant force (FB) exerted on the balloon is 0.0765 N, what is the density of the air?
A) 1.10 kg/m3
E) 0.13 kg/m3
B) 1.60 kg/m3
F) 2.10 kg/m3
FB = ρfVg
3
C) 0.09 kg/m
G) 1.50 kg/m3
ρf = FB / Vg = (0.0765N)/(6 × 10−3m 3 ⋅ 9.81N/kg) = 1.30 kg/m 3
D) 1.30 kg/m3
H) 0.11 kg/m3
12. You want to fill a 0.0189m3 bucket with water to wash your car. Water exits a hose
with a speed of 0.61 m/s. The radius of the faucet is 0.0078 m. How long does it take to
fill the bucket completely?
A) 9.30 s
E) 162 s
V = Avt = π r 2 vt
B) 17.0 s
F) 199 s
t = V / π r 2 v = 0.0189m 3 / ...
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This document was uploaded on 03/03/2014 for the course PHY 231 at Michigan State University.
 Summer '08
 smith
 Physics, Acceleration

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