# Posts by wen

Total # Posts: 18

Chemistry: Salt of weak acids and bases
If 25 mL of 0.20M NaOH is added to 20 mL of 0.25M boric acid, what is the pH of the resultant solution?

Literacy 2
Are their any images

chemistry
If 350 grams of pure fe2o3 is used, how grams of can be produced? the reaction is: fe2+3c---2fe+3co

Math
60

Chem 1
An 80.0-gram sample of a gas was heated from 25 degrees celsius to 225 degrees celsius. During this process, 346j of work was done by the system and its internal energy increased by 7785j. What is the specific heat of the gas?

Math
N is increased by 2n,the sum is 5more than 4n

Math
15 decreased by twice n equals 13

math
1.79

physics
please give a me a nice topic for my investigatory project. hope the materials also are easy to gather. thanks alot

physics
an object falls from a plane flying horizontally at an altitude of 40,000 ft at 500 mi/h. How long will it take to hit the ground?

Finance
45036

Math
A 30 year fixed rate \$100,000 mortgage loan . The interest rate is 7.5% compounded monthly.After 20 years the bank is making an offer to refinance at a lower rate of 4.5% . The estimated closing costs are \$3,000?

algebra
The horsepower (hp) that a shaft can safety transmit varies jointly with its speed (in revolutions per minute, or rpm) and the cube of the diameter. If a shaft of a certain material 2 in in diameter can transmit 36 hp at 75 rpm, what diameter must the shaft have in order to ...

algebra
A motorboat can maintain a constant speed of 24 mph relative to the water. The boat makes a trip upstream to a certain point in 62 minutes. the return trip takes 34 minutes. What is the speed of the current?

differential calculus
a right circular cylinder has a fixed height of 6 units. Find the ratio of change of its volume(v) with respect to the radius(r) of its base.

differential calculus
Find how fast (a) the circumference (b)the area, if a cicle increases when the radius increases.

differential calculus
a right circular cylinder has a fixed height of 6 units. Find the ratio of change of its volume(v) with respect to the radius(r) of its base.

windows xp and vista
Cheater...hopefully you failed.