A 70.-0_kg man ties on his back on a bed of nails, with 1,209 of the nails in contact with his body. The end of
each nail has area 1.12 x 10"6 m2. What average pressure is exerted by each naii- on the man's body?
i - - i - i i i - _ i F h ' - - g * t
EXAMPLE 9.5 Oil and Water
the pressure P1 at the bottom of the oil layer. Then use this pressure in place of P 0 in the
and calculate the pressure Pbelt at the bottom of the water layer.
r ' . . - .
* * ifriiiumiitunnIniil-riupilinnnniqinI.rr-luruuuuu
GOAL Apply Archimedes principle to a
PROBLEM A bargain hunter purchases a
"gold" crown at a ea market. After she gets
home, she hangs it from a scale and finds its
weight to be 7.84 N (Figure (a). She then
weighs the crown while it is im
For which reaction, carried out at standard conditions. would both the cnthal and
drive the reaction in the same direction? N canopy Chm
2mm + (312(3) -> 2NaCl(s) AH = .3221) k]
(D) 2W3th > Nam) + 3H2(g) m AH = +92.4kJ
. A particular chemical reaction h
3vinl Poa nr '
' Gravitational Potential Energy is the energy
associated with the relative position of an object in
space near the Earths surface
- Objects interact with the earth
throngh the gravitational force
or rattionl P
The mrk done by the -.
Amt? Pamrs principle to a car lift,r and show that the input work is the same as the output work
In a car lift used in a service station, compressed air exerts a force on a. small piston of
.l 3: at. m having a radius of r1 = 5.00 This. pressure is trans
Which of the following is not released by the combustion of fossil fuels?
A) 002 B) 03 @10 D) CH4 5) 302
In the troposphere. temperature with increasing altitude. while in the stratosphere,
temperature with increasing altitude.
A) decreases, decreases
H m I. In. I I 3 u I I I u I Ii IM-@- III I. - - 5%" I I I I - i = 'Ir'TI-"si- " 1" -' i'dI- wu ' u -._-" ' . _ -_ i :_ '- lJ" ' .'_-'- r '_ _1-_ - _-'- '."_ - 'u '1- - -. _5'. _' - r - ._ . ._ , _. . kr- . . . . . . .
1 J u r r- E 1 H - , 3" - knit-i.- _
Comider the reaction:
N2(g) + 3 F2(g) r 2 NF3(g) AH° = -249 RJ and AS" =-' 278 J/K at 25°C
Calwlate AG and state whether the equilibrium composition should favor reactants or products at
A) AG = 1-66 liJ; the equilibrium composition shoul