The density of a 57-kg (126-lb) person who can float in salt water but not in fresh water is about
1) 505 kg/m3 (32 lb/ft3)
2) 1010 kg/m3 (63 lb/ft3)
3) 2020 kg/m3 (126 lb/ft3)
4) 4040 kg/m3 (252 lb/ft3)
and has a volume of about
5) 1 ft3.
6) 2 ft3.
7) 3 ft3.
8) 4 ft3.
9) need more information
Answer: 2, 6
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Addition by Components: The figure shows two vectors 
and 
, along with their magnitudes and directions. The vector 
is given by 
= 
- 
-5.0px;" />.
(a) What is the magnitude of vector 
?(b) What angle does vector 
make with the +x-axis?
Fill in the blank(s) with the appropriate word(s).
Atmospheric air at 10°C enters a 2 m long smooth rectangular duct with a 7.5 cm x 15 cm cross-section. The mass flow rate of the air is 0.1 kg/s. If the sides are at 150°C, estimate (a) the heat transfer coefficient, (b) the air outlet temperature, (c) the rate of heat transfer, and (d) the pressure drop.
GIVEN
Atmospheric air flow through a rectangular duct
Inlet bulk temperature (Tb,in) = 10°C
Duct length (L) = 2 m
Cross-section = 7.5 cm x 15 cm = 0.075 m ? 0.15 m
Mass flow rate (m) = 0.1 kg/s
Duct surface temperature (Ts) = 150°C
FIND
(a) The heat transfer coefficient ch
(b) The air outlet temperature (Tb,out)
(c) The rate of heat transfer (q)
(d) The pressure drop (?p)
ASSUMPTIONS
Steady state
The duct is smooth
SKETCH
for dry air at the inlet bulk temperature of 20°C
Thermal conductivity (k) = 0.0251 W/(m K)
Absolute viscosity (?) = 18,240 × 10–6 (Ns)/m2
Prandtl number (Pr) = 0.71
Specific heat (c) = 1012 J/(kg K)
The time interval during which a nucleus has a 50% probability of decaying is its _________
Fill in the blank(s) with correct word