Posts by Jack
Total # Posts: 1,754
Thanks. I understand it now. But we have like set formulas in our tables for incidence like v=u+at etc. I have learnt the changing velocity over time but in a test situation would I have to use the formulas given or the method appove?
November 5, 2015
A boat pilot wishes to go in a straight line across a river from the east dock to the west dock in a ferryboat that has a still water speed 8.0 knots. If the river has a Southward current of 2.5 knots, what compass heading should be maintaned while crossing the river? What is ...
November 3, 2015
what event convinced south Carolina to spend representatives to the first continental congress ? A. passage of the currency act B. passage of the intolerable act C. passage of the navigation act D. passage of the stamp act is it D
October 20, 2015
A drama club wants to raise at least $500 in ticket sales for its annual show. The members of the club sold 50 tickets at a special rate of $5. The usual ticket price the day of the show is $7.50. At least how many tickets do they need to sell the day of the show to meet the ...
October 11, 2015
DBP Inc. just paid a dividend of $2.50. The expected growth rate of dividend is 5 percent. The required return for investors in the first three years is 12 percent and 10 percent for the following three years. After those six years the required return is 8 percent. What is the...
September 26, 2015
A tennis player serves a tennis ball it is moving horizontally when it leaves the racquet. When the ball travels a horizontal distance of 12 meters, it has dropped 55cm from its original height when it left the racquet. What is the initial speed of the ball? (neglect air ...
September 13, 2015
A tennis player serves a tennis ball it is moving horizontally when it leaves the racquet. When the ball travels a horizontal distance of 12 meters, it has dropped 55cm from its original height when it left the racquet. What is the initial speed of the ball?
September 13, 2015
Using the following conversion factors, determine the number of milliliters in a volume of 2.37 fluid ounces: 1 gallon (gal) = 128 oz., 3.785 x 10-3 cubic meters (m3) = 1 gal, 1 mL = 10-6 m3. I got an answer 7.09ml, but it's incorrect, so confused how to covert those factors
August 8, 2015
If the electromagnetic radiation used to send television signals have a frequency of 3.0 * 10^9 Hz, what is its wavelength? I forget how to do a problem like this. Just taking a guess, is this somewhat a conversion equation?
July 8, 2015
How does the kinetic-molecular theory help explain the difference between solids, liquids, and gases? I don't know how to really answer this question because the theory only talks about gases, unless I am looking at the wrong one. I tried to look it up swell and all I got ...
July 8, 2015
When naming a molecular compound, such as CO, would I write it as mono carbon monoxide or carbon monoxide? My textbook has the rule written as prefix+1st element prefix+2nd element, but I am not sure if the mono applies to the carbon or not.
July 7, 2015
What data led to the development of the Law of Multiple Proportions? Give an example and explain why this law is important in chemistry. Would this be a good answer: John Dalton used the same observations he used for his law of definite proportions to help develop the law of ...
June 28, 2015
The density of chloroform at a pressure of 220 mmHg and 25 degrees celsius is 1.42 g/L. Calculate the molar mass of chloroform. My set up is: mol*K .289 atm 1 1.42g/L ------------- ------------ ------ --------- .08206Latm 1 298K What I am unsure of is if this is the right way ...
June 27, 2015
How does the kinetic molecular theory help explain the difference between solids, liquids, and gases? Would the answer be basically stating how the theory states the difference of their atom structure? Or is it something else?
June 27, 2015
The thiosulfate ion (S2O32-) is oxidized by iodine as follows: 2S2O32-(aq) + I2(aq) → S4O62-(aq) + 2I-(aq) In a certain experiment, 4.41×10-3 mol/L of S2O32- is consumed in the first 11.0 seconds of the reaction. Calculate the rate of production of iodide ion in ...
May 14, 2015
Which has the highest, second highest, third highest, and lowest boiling points? 1.0.20 m MnSO4 2.9.6E-2 m Al2(SO4)3 3.8.4E-2 m Al2(SO4)3 4. 0.45 m Sucrose(nonelectrolyte) [I know it is m times i but not sure how to get "i"]
May 13, 2015
IT/235 - IMAGE EDITING AND IMPLEMENTATION
If done in-house, what equipment would be required and what costs would be incurred? How would the photography affect the day-to-day store operations under each model?
May 11, 2015
A solution is made by dissolving 26.7 g urea, a nonelectrolyte, in 301 g water. (The vapor pressure of pure water is 23.8 torr at 25°C and 71.9 torr at 45°C.) Calculate the vapor pressure of this solution at 25°C.
May 6, 2015
The demand in units per week for a given product as a function of its price, p, in dollars is given as D(p) = 1100 Ð 200p, the supply of the same product in units per week as a function of its price, p, in dollars is given as S(p) = 100p Ð 100. The market clearing ...
April 21, 2015
Garden Variety Flower shop uses 625 clay pots a month. The pots are purchased at $2 each. Annual carrying costs per pot are estimated to be 15 percent of cost, and ordering costs are $125 per order. The manager has been using an order size of 1,500 flower pots. There are 4 ...
April 16, 2015
a) The value of a computer after t years after purchase is v(t) = 1000e^(-0.45t). At what rate is the computer's value falling after 5 years? b) Assume that the total revenue received from the sale of x items is given by R(x) = 32 ln (5x+3), while the total cost to produce...
April 13, 2015
Boris has a coin and a number cube. The number cube is labeled 1-6. He flips the coin once and rolls the number cube once. What is the probability that the coin lands tails up and the cube lands on a even number? A. 2/3 B. 1/4 C. 1/12 D. 1/6 How do i solve this problem? I'...
April 9, 2015
This is nothing to do with school
A cinema sells adult tickets and child tickets. The total cost of 3 adults and 1 child is £30 The total cost of 1 adult and 3 children is £22 What is the cost of adult and child tickets
March 31, 2015
6 grade math
Choose all statements that are not true. a 20% of 20 is 4 b 30% of 30 is 9 c 40% of 50 is 15 d 50% of 110 is 60 e 60% of 60 is 360 The answer I choose is all of them. Is this correct.
March 26, 2015
H2(g)+ o2(g)-> H20(l) (delta)Hf(h20(l)=-286 kj/mol the total volume of hydrogen needed fill the hindenberg was 2.3 x 15^5 m^3. what is the theoretical yield of heat (that which could have been evolved) when the hindenberg exploded, assuming all the hydrogen reacted?
March 15, 2015
okay thank you very much for helping me and everyone else that asks questions on here I think you did a really good job answering my questions and I will keep what you said about the molar mass and the atomic masses in mind for next time. Again I can't thank you enough.
March 13, 2015
okay I think I got, I got 7.1 x 10^-7 for part a, and I got for part b that they should be the same, and for part c I got 3.7 x 10^4, and finally for part d I got since 1.1 x 10^-8 is greater than 5.0 x 10^-13 a precip will form.
March 13, 2015
Several reactions are carried out using AgBr, a cream-colored silver salt for which the value of the solubility product constant, Ksp, is 5.0 x 10-13 at 298 K. a) Calculate the value of [Ag+] in 50.0 mL of a saturated solution of AgBr at 298 K. b) A 50.0 mL sample of distilled...
March 13, 2015
First of all, lets note what the formula is. A=bh or lw 25 is the width so lets plug it in. 25w=150+175t Next, you evaluate that by Isolating the "w". Divide the 25 by 25 and divide 150+175t to get 6+7t Get rekt noob........
March 3, 2015
The people of Brazil can best be decribed as A Primarily indigenous in descent B largely of the white European ancestry C mestizos with shared-indigenous heritages <--- c is my answer D mixed race with native, African, and European roots.
February 28, 2015