Friday
July 25, 2014

Posts by han


Total # Posts: 85

Physics
Assuming the best high jump record from a standingposition in a school was 1.52 m, what initial velocity was needed for this jump? Neglect any sideways motion.

Physics
wait nvm

Physics
If I send you a link could you take a look at it?

Physics
A 45-t electric train accelerates uniformly from a station with the train’s motion depicted in the graph in Figure 2.(Recall that 1 t = 1.0 × 103 kg.)Determine the net force acting on the train during the uniform acceleration portion of the motion.

Physics
Alright thanks a lot mate :D

Physics
The Yukon Quest, an annual dog-sled race between Whitehorse in the Yukon and Fairbanks in Alaska, covers a gruelling distance of 1.61 × 103 km. Assuming that the average speed of the dog team that set a course record is 6.28 km/h, determine the best time for this race. E...

Math
I know

Math
Use partial factoring to determine the vertex of y=3x^2+5x-1.

Math
oh ok thanks a lot for your help :D

Math
angle theta is in the standard position and 0'=<theta=<180'. If cos theta = -2/3, find the exact value of sin theta* tan theta.

Math
thanks for you help :D

Math
The doubling period of a bacteria culture is 35 minutes and it starts with 1400 bacteria. How many bacteria will there be after 3 hours? Round your answer to the nearest tenth.

Maths
ok thanks a lot for your help :D

Maths
The average depth of the water in a port on a tidal river is 4 m. At low tide, the depth of the water is 2 m. One cycle is completed approx every 12 h. a) find an equation of the depth d(t) metres, with respect to the average depth, as a function of the time, t hours, after lo...

Math
sorry it should be corrected to t

Math
Determine the number of triangles that could be drawn with the given measure. Then, find the measures of the other angles and the other side in each possible triangle. Round side lengths to the nearest tenth of a unit and angle measure to the nearest tenth of a degree, where n...

Math
Ok thanks a lot for your help steve :D

Math
How do you know what the period of this function is: y=2cos3(x+45')? Explain.

Math
ok thanks a lot for your help :D

Math
Determine the number of triangles that could be drawn with the given measure. Then, find the measures of the other angles and the other side in each possible triangle. Round side lengths to the nearest tenth of a unit and angle measure to the nearest tenth of a degree, where n...

Maths
but that wasn't the correct answer

Maths
Find the maximum or minimum value of function and the value of x when it occurs: -2x^2+5x+5.

Math
wait nvm thanks for your help :D

Math
so can you show me the correct way to do it?

Math
but the answer says that it's a max of 65/8 at x=5/4

Math
Find the maximum or minimum value of function and the value of x when it occurs: -2x^2+5x+5.

Chemistry
ok thanks :D

Chemistry
A sample of hydrogen gas is collected by water displacement at 20.0'C when the atmospheric pressure is 99.8kPa. What is the pressure of the dry hydrogen, if the partial pressure of water vapour is 2.33kPa at that temperature?

Chemistry
I figured it out thanks for your help :D

Chemistry
I got 1.7*10^4L but not sure if I was correct or not

Chemistry
A tank of chlorine gas contains 25.00 kg of pressurized liquid chlorine. If all the chlorine is released in its gaseous for at 17'C and 0.98atm, what volume does it occupy?

Math
If 5+x, 8, and 1+2x are consecutive terms in an arithmetic sequence, find x.

Math
A doctor prescribes 200 mg of medication on the first day of treatment. The dosages is halved on each successive day for one week. To the nearest milligram, what is the total amount of medication administered?

Math
Find the sum of the arithmetic series -12-9-6-...39.

Math
How do you get the values?

Math
A tractor-trailer worth $84 000 depreciates 20% the first year and 10% each year thereafter. How much is it worth after 5 years?

Math
wait I understand thanks for your help :D

Math
why didn't you use this equation: 765=3(2)^n-1

Math
How many terms of the series 3+6+12+24+...add to 765?

Maths
like sorry for the sequence 1, 4, 16 how did you get 1?

Maths
I have one last question. How did you know a=1?

Maths
alright thanks :D

Maths
by the way did you multiply the equation by 10 to get rid of the decimal to get a whole number?

Maths
Thanks for your help :D

Maths
A geometric series has three terms. The sum of the three terms is 42. The third term is 3.2 times the sum of the other two. What are the terms?

Math
ok thanks

Math
A ball is thrown 16 m into the air. The ball falls, rebounds to half its previous height, and falls again. If the ball continues to rebound and fall in this manner, find the total distance the ball travels until it hits the ground for the sixth time.

Chemistry
ok thanks a lot for your help :D

Chemistry
so then would the answer be 2.07?

Chemistry
The temperature of a 2.25L sample of gas decreases from 45.0'C to 20.0'C. What is the new volume?

Math
thanks a lot for your help!

Math
Canada ranks fifth in the world in the production of gold. By the end of one year, one of Canada's mines had produced about 198 t of gold since it opened. if the annual production averaged 4.5 t, predict the total production by the end of next year and the year after that

Math
A Canadian zoo started with 16 whooping cranes and planned to hatch 20 chicks a year. A few birds were kept for breeding and the rest released into the wild. At the end of last year, a total of 136 cranes had spent some time in the zoo. If the pattern continues, how many crane...

Physics
Hey thanks a lot but how did you know to put 8/(24)?

Physics
Find the equivalent resistance in 16 ohm and 8.0 ohm connected in parallel.

Physics
Find the equivalent resistance in 16 ohms and 8.0 ohms connected in parallel.

Math
Alright thanks a lot :D

Math
An exponential function with a base of 3 has been vertically stretched by a factor of 1.5 and reflected in the y-axis. Its asymptote is the line y=2. Its y-intercept is (0,3.5). Write an equation of the function and state its domain and range.

chemistry
Thanks :D

chemistry
can you please show me the proper way to do it?

chemistry
Yes but the answer was incorrect

chemistry
HCL acid is available as a stock solution with a concentration of 10 mol/L. If you need (9.0*10^-1) L of (2.50*10^0) mol/L hydrochloric acid, approximately how much distilled water will you need to make the dilution?

chemistry
Thank you for all your help it was much appreciated :D

chemistry
When I did the equation you gave me I got 483mL but that wasn't the answer.

chemistry
but doesn't the litres in the mol/L have to be converted to mL?

chemistry
HCL acid is available as a stock solution with a concentration of 10 mol/L. If you need (2.100*10^0) L of (2.3*10^0) mol/L hydrochloric acid, approximately how much distilled water will you need to make the dilution?

Math
Type Amount Recycled (%) Amount Recycled (in millions of tons) Paper and Paperboard 52.8 45.9 Yard Trimmings 22.2 19.3 Metals 8.6 7.5 Glass 3.7 3.2 Plastics 3.1 2.7 Wood 2.7 2.3 Food waste 1.6 1.4 Other 5.3 4.6 Date US Population Jul 1, 2012 313.85 million Jul 1, 2011 311.59 m...

Math
1. You want to deliver an article with the most impact and easy reading to the readers; you decide that you need to present the data as percentages. For each of the data statements, though, none of them have percent’s. Convert each statement’s data into a percentage....

accounting
11422 4572 812 4518

math
if the area of a rectangle is 27 square inches and one side is 3 inches how many square inches is the other side

physics
An electric motor is tested and found 76% efficient. if the input work is 400 J, what is the motors output work?

7th grade
english: how are you supposed to make a person that bribes people to a character trait

Econimics
Is president Obama's plan for health care reform socialism or common sense " mixed economy" approach in the economic and political mainstream of America? How would Adam Smith have used the free market to solve our health care problem? What other models exist for ...

Repost physics
thank you damon

Repost physics PLEASE HELP IS NEEDED
pweasey-weasy?

Repost physics
Suppose the position of an object is given by ->r(vector) = (3.0t^2*ihat - 6.0t^3*jhat)m. Where t in seconds. Determine its velocity ->v as a function of time t. Determine its acceleration ->a as a function of time t. Determine ->r at time t = 2.5 s. Determine ->...

chem
The bond enthalpy of N2(g) is 418.0 kJ/mol. Calculate ÄH°f for N(g). I figured that if it gave the enthalpy for N2, then the enthalpy for N would be half of the given amount. But that wouldn't be bonded to anything?? Is there a standard calculation?

bio - cell and molec
for what values of delta G would the following reactions have? (no numerical value, just positive or negative) a. ATP -> ADP + P(subscript i) b. ADP + P(subscript i) -> ATP c. Glucose -> Pyruvate d. glocose -> oxygen e. starch -> glucose

chem
NO2(g) → ½N2(g) + O2(g) DH1 = -33.9 kJ NO2(g) → NO(g) + ½O2(g) DH2 = 56.5 kJ What is DH for the reaction ½N2(g) + ½O2(g) → NO(g) ?

college gen chem
A quantity of 16.13 mL of a KOH solution is needed to neutralize 0.4883 g of KHP. What is the concentration (in molarity) of the KOH solution?

physics
i am not sure

physics
i am not sure

social studies/ state goverment
what is the vehicle registration in Minnesota? and what is the driver licensing location in Minnesota?

Romeo and Juliet (English Literature)
1. To what heavenly body does Romeo compare Juliet? Why is this so? 2. What does Juliet mean when she says to Romeo, "tis, but thy name that is my enemy?" 3. How is Romeo let to Juliet's home? 4. Is it difficult for Romeo to win Juliet's love? Why? 5. Why doe...

Air pollution analysis
What are the effect of the following on demand for gas/oil/highways/airpollution? 1. a 900 annual tax on vehicle that gets less than 20 mil/gallon 2. 2000 annual income tax credit for owners of hybrids 3. income tax surcharge that lowers disposabl income to reduce demand for a...

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