Physics Help PLEASE!

[sportsballa]

need some more help lmk if u can help me thanks

9) A girl is floating in a freshwater lake with her head just above the water. If she weighs 515 N, what is the volume of the submerged part of her body?
___ m3
10)How many grams of oxygen are there in 29 g of water?
___ G
14) Find the density of a 6 kg solid cylinder. The cylinder is 20 cm tall and has a radius of 2 cm.
____ g/cm3
16) The depth of water behind the Hoover Dam in Nevada is 220 m. What is the water pressure at the base of this dam? (Neglect the pressure due to the atmosphere.)
____ kPa
17)A merchant in Katmandu sells you a solid gold 8 kg statue for a very reasonable price. When you get home, you wonder whether or not you got a bargain, so you lower the statue into a measuring cup and measure its volume. What volume will verify that it's pure gold?
____ cm3
18) An ice cube measures 9 cm on a side, and floats in water. 0.9 cm extends above water level. If you shaved off the 0.9 cm part, how many cm of the remaining ice would extend above water level?
____ cm
20)How much lift is exerted on the wings of an airplane that have a total surface area of 109 m2 when the difference in air pressure below and above the wings is 8% of atmospheric pressure?
_____ N
31) What is the ideal efficiency of an automobile engine where fuel is heated to 2800 K and the outdoor air is at 260 K?
____ %

thanks a lot

[dh5123]

for number one use the heat capacity of water equals the heat(what you're looking for) over mass x change in temp.

So you end up with q (heat)= 4186 x .0525 kg x (82.7 - 4.5)

That should give you your answer in joules

[dh5123]

and a hint for 9...buoyant force=volume of water displaced

[sportsballa]

Thanks for the help any others that can help?

[sportsballa]

bump need to finish this soon all help appreciated

[sportsballa]

help please anything would be helpful thanks

[blalock_collector]

lol
Now SCF is for getting homework help?

I failed physics so I'm no help sorry. HAHAHA

[sportsballa]

last bump..........