PAH

The given table of information in my book is

The entry for phthalic acid gives the following solubility data(in grams of solute per 100 mL of solvent). Water - 0.54 at 14 degrees C and 18 at 99 degrees C.

Now, the first question asks for the volume of water needed to dissolve 4.2g of phthalic acid, for which i used the equation:

(4.2g/18g)=(x/100mL) and got 23.33 mL

Did I do this right? because the second part of the question asks if the resulting solution in problem 3 were cooled to 14degreesC, how many grams of phthalic acid would crystallize out, and what would be the percent recovery.....

Im so confused! I fell like its just a simple calculation but I'm just stuck..... any help would be GREATLY appreciated :)! thank you!

The charges are placed on the points a equilateral triangle with distances of 1 cm and angles of 60degrees. The bottom two charges are +2nC while the top on is +4.7 nC

What is the magnitude of the force on the top charge Q= +4.7nC?

i tried this many times but cannot get the right answer! i know it has to do with the x and y components but i dont think i am doing it quite right ....PLEASE HELP!!

Resistances of 8Ω and 12Ω are connected in parallel between points

A and B. This combination is in series with another of resistances XΩ

and 16Ω in parallel between points B and C. The voltage between

points A and C is 16V (volts) and the current is 2A. Find the resistance

value X?

im just really confused what to do i keep getting the wrong answer and i dont know why....any help is greatly appreciated!!

A.)An FM radio station broadcasts at a frequency of 101.3 MHz. What is the wavelength?

-I got the answer to this question, which was 2.96 m

B.)What is the frequency of a sound source that produces the same wavelength in 20degrees C air?

Now....this part of the question i am having great difficulty with...any help is greatly appreciated thanks!!

Ball 1, with a mass of 140 g and traveling at 11.0 m/s, collides head on with ball 2, which has a mass of 350 g and is initially at rest.

What are the final velocities of each ball if the collision is perfectly elastic?

i understand how to figure this out for the inelastic collisions because the final velocities are the same, however im stuck on how to solve this because there are 2 unknowns with elastic collisions. any help is greatly appreciated. THANKS!

On a frictionless horizontal air table, puck A (with mass 0.251 kg) is moving toward puck B (with mass 0.375 kg), which is initially at rest. After the collision, puck A has velocity 0.117 m/s to the left, and puck B has velocity 0.653 m/s to the right.

I got the that the initial velocity of puck A is .859 m/s.....Now-

Calculate DeltaK, the change in the total kinetic energy of the system that occurs during the collision.

I know that deltaKE=KEinitial-KEfinal however i CANNOT seem to get the right answer and i get points deducted for every wrong answer :/

Thanks for your help!!

A cue ball in a billiard game travels directly northeast across the table

or 57 cm and then ricochets off the eight ball to travel 20 cm due west,

before coming to a stop. The net displacement vector of the cue ball

points in the direction closest to:

a. θ= 0.5 radians north of east

b. θ = 0.8 radians north of east

c. due north

d. θ = 1.0 radians north of east

e. θ = 0.5 radians west of north

how do i start?!?!

Ships A and B leave port together. For the next two hours, ship A travels at 30.0 mph in a direction 55.0 degrees west of north while the ship B travels 40.0 degrees east of north at 40.0 mph.

What is the distance between the two ships two hours after they depart?

What is the speed of ship A as seen by ship B?

HOW DO I START THE PROBLEM??

A sprinter can accelerate with constant acceleration for 3.80 s before reaching top speed. He can run the 100-meter dash in 10 s.

What is his speed as he crosses the finish line?

show work please :)

calculate the area of the triangle and state your result with the uncertainty:

base length: 5.3 ± 0.4cm

height: 3.4 ± 0.2 cm

area=?

and please show your work! thanks!

Is it possible for the payer of my phone bill to check my call/text history? I have a sprint phone and my phone is under a family plan, but my number is not the primary one, so could others possibly check my call/text history and if so how far back does it go?

I saw my friends father with patches taped to his chest with wires that connected to a little monitor that was clipped to his hip. I didnt want to offend or upset her by asking about it , but i was just curious if it could be something serious (i really hope not, shes loves him so much and hes a really great person).....any ideas?

Is the major that you put on your common app what you will have to do if they accept you into that college?

What about the major you put on a supplemental form for that college?

ANY AND ALL HELP IS GREATLY APPRECIATED! THANK YOU SO MUCH!

ok so the lyrics are something like ::

so tell me whats the sitch, whats the si-si-situation

were having relation...something something something.

im pretty sure thats what they say before the chorus, but ive been trying to think of the rest of the lyrics and i just cant. its sung by a dude, cant remember his name either.

so PLEASE HELP ME!! ITS KILLING ME!! IVE BEEN RACKING MY BRAINS ALL DAY AND I CANT THINK OF ANY"THING!!!

Who else affects Paul's decisions in the movie Hotel Rwanda((not including his wife Tatiana))

Who else influenced Paul Rusebagina's decisions apart from Tatiana(wife).