Wednesday

July 23, 2014

July 23, 2014

Total # Posts: 85

**biomechanics**

During a biceps curl, the elbow's relative angle during flexion changes from 3° to 157°. During an 8 repetition set, what is the total angular distance and displacement at the elbow in degrees and radians?

**Physicis**

Airplane staring from airport a flies 300 km east then 395 km 26.5 degrees west of north, and then 150 km north to arrive at airport b. what angle is the straight flight from a to b north of east and how far

**Calculus**

A table of values for f,g,f′, and g′ are given in the table below: x f(x) g(x) f′(x) g′(x) 5 0 -4 -9 5 0 5 0 -6 9 -4 5 5 9 -5 If h(x)=f(g(x)), find h′(5), If H(x)=g(f(x)), find H′(0)

**Calculus**

A table of values for f,g,f′, and g′ are given in the table below: x f(x) g(x) f′(x) g′(x) 5 0 -4 -9 5 0 5 0 -6 9 -4 5 5 9 -5 If h(x)=f(g(x)), find h′(5), If H(x)=g(f(x)), find H′(0)

**Calculus**

If f(3)=−3, g(3)=9, f′(3)=1, and g′(3)=2, Find (f/(f−g))′(3).

**Calculus**

A manufacturer produces bolts of fabric with a fixed width. The quantity q of this fabric (measured in yards) that is sold is a function of the selling price p (in dollars per yard), so we can write q = f(p).Then the total revenue earned with selling price p is R(p) = pf(p).Gi...

**Calculus**

A rectangular storage container with an open top is to have a volume of 10m^3. The length of its base is twice the width. Material for the base costs $3 per m^2. Material for the sides costs $10.8 per m^2. Find the dimensions of the container which will minimize cost and the m...

**Calculus**

The owner of a used tire store wants to construct a fence to enclose a rectangular outdoor storage area adjacent to the store, using part of the side of the store (which is 220 feet long) for part of one of the sides. (See the figure below.) There are 430 feet of fencing avail...

**Math**

If i have 3 inch squares cut out the corners of a rectangular shaped piece of cardboard...after folding the the to form a box the length is twice as long as it is wide and has a volume of 1350 cubic inces...what are the dimensions

**calculus**

Find the values of p for which the following series is convergent. The sum from n=2 to infinity of 1/(n(ln(n))^p). I tried the integral test using u-substitution, and I know the answer is p>1, but I'm not quite sure how to get there. Thanks for the help.

**Calculus**

Prove that the integral from 0 to 2 of sqrt(4-x^2)dx = pi Should I use a trip substitution for this? Thanks for the help.

**calculus**

f''(x) = (3x^3 - 5x^2 + 1) / x^2; and f(1) = 0, f(-1) = 1. So i turn f''(x) into (3x^3 - 5x^2 + 1)(x^-2) and multiply to get f''(x) = 3x - 5 + x^-2 So f'(x) = (3/2)x^2 - 5x - (1/x) + c And f(x) = (1/2)x^3 - (5/2)x^2 - ln(x) + cx + d Not really sure ...

**Calculus**

Use implicit differentiation to find dy/dx. e^4x = sin(x+2y). This is a practice problem. It says the correct answer is 4e^x/(2sin(x+2y)) but I keep getting 4e^(4x)/(2cos(x+2y)). I thought the derivative of e^(4x) would be 4e^(4x), not 4e^(x). And I use chain rule on sin(x+2y)...

**calculus**

Differentiate: 1/s+ke^s Do I just use the quotient rule? Thanks

**calculus**

Suppose f'(x) = xe^-x^2. a) On what interval is f increasing? On what interval is f decreasing? b) Does f have a maximum value? Minimum value? So should I assume that f'(x) > 0 since e has to be a positive number?

**calculus**

a) Sketch a curve whose slope is always positive and increasing. b) Sketch a curve whose slope is always positive and decreasing. c) Give equations for curves with these properties. So for a, I drew a positive slope that was concave up. And for b, I drew a slope that was conca...

**chemistry**

Water (H20) is a liquid at room temperature and atmospheric pressure whereas hydrogen sulfide (H2S) is a gas under the same conditions. Based on this information, what can you say about the intermolecular interactions in these two substances. So would this have to do with liqu...

**Chemistry**

Specify the number of core and valence electrons for Ti^2+ Can I just pretend that this ion is calcium and calculate the valence electrons that way? So 18 core, 2 valence?

**Chemistry**

Write the chemical symbol for the atomic species with 35 electrons and a charge of +34 on the nucleus. Does the +34 charge just mean the number of protons? And then 35 electrons would give it a - charge so it would be Se-? Or am I looking at this question wrong? Thanks!

**chemistry**

"The sun emits UV radiation that can have serious health consequences. In particular, so-called UVB radiation is mostly absorbed by the ozone layer in the upper atmosphere (altitudes of 10 - 50 km), but the part that reaches the earth can cause DNA mutations. The highest ...

**Chemistry**

"The sun emits UV radiation that can have serious health consequences. In particular, so-called UVB radiation is mostly absorbed by the ozone layer in the upper atmosphere (altitudes of 10 - 50 km), but the part that reaches the earth can cause DNA mutations. The highest ...

**chemistry**

5.0% glucose has a specific gravity of 1.02. what is the mass of 470mL of glucose solution.

**general**

What are the various long-term and short-term impacts of food wastage? Please give answers from multiple area eg. cultural,social,economics etc. Global warming I have found out about it so please give a more insightful answe

**geometry**

A line has a slope of 0.5 and a y-intercept of (0, -2). What is the value of y when x = 4?

**chemistry**

nevermind got it

**chemistry**

the thermite reaction was previously used to weld the rails of railroad tracks together. the reaction is: Fe2O3(s)+ 2Al(s)--> 2Fe(l)+ Al2O3(s) (2Fe and 3 oxygen) (2Al and 3 oxygen) what masses of iron(III) oxie and aluminum must be used to produce 15.0g of liquid iron? what...

**Physics**

Actually, forgot to square the velocity: KE = (1/2)(1540kg)(30.6)^2 = 720997.2 Joules

**Physics**

Kinetic Energy (KE)=(1/2)mv^2 First convert km/hr to m/s (110km/hr)*(1000m/1km)*(1hr/3600s) = 30.6 m/s Plug everything into the formula KE = (1/2)(1540kg)(30.6m/s) = 23527.78 Joules

**Chemistry**

What happens in confirmatory test for bismuth? What happens in confirmatory test for copper? What happens in confirmatory test for arsenic? Please help! an you explain in detail. even a link explaining it would help

**chemistry**

write the name or formula for a reagent that will dissolve PbCl2 but not Hg2Cl2 and AgCl?

**chemistry**

Calculate the activation energy (in Joules) for a reaction whose rate constant doubles when the temperature is raised from 298 K to 500 K. Take R to be 8.314 J/K-mol.

**chemistry**

Very carefully, but breifly discuss, with specific example, Le Chatelier Principle and its relationship to common ion effect.

**Physics**

Hello, Steve. Thanks for help, but I'm sorry that your answer is incorrect. I had tried your answer， but it said incorrect.

**Physics**

In a scene in an action movie, a stunt man jumps from the top of one building to the top of another building 3.5 m away. After a running start, he leaps at an angle of 14 with respect to the flat roof while traveling at a speed of 5.6 m/s. The acceleration of gravity is 9...

**statistics**

377

**math**

What 2 numbers multiply to 30 but add to 16

**Chemistry **

Calculate the amount of energy released when Methane is burned.

**Chemistry **

Calculate the amount of energy released when Butane is burned.

**Chemistry **

Calculate the amount of energy released when Ethanol is burned.

**English**

Im on the same question :/

**math**

Bill purchased 4 pens for $3.32 including $.16 sales tax. FIND THE C COST OF ONE PEN. I need to write this in an equation. Then solve thats what the worksheet says.

**Math**

I am a 5-digit whole number. I have 4 different digits. There are no 7s or 5s and I only have one 2. My hundreds digit is the least. My tens digit is odd and is the sum of all the other digits. What number could I be?

**calculus**

find the centroid of the region bounded by x^2-12x and the x-axis

**chemistry**

How many grams of NH3 are produced when 5.40g of H2 react with an excess of N2?

**geometry**

Find the radius of the circle whose equation is (x^2 - 10x + 25) + (y^2 - 16y + 64) = 16.

**college algebra**

Find the arc of the following: f(x)=x^2-8x+15 from x=4 to x=6

**college algebra**

10+2[2+(1+1)-2^2]

**algebra**

10+2[2+(1+1)-2 to the 2nd power]

**Chemistry **

Which aqueous solution would you expect to have the lowest freezing point? (a) 0.10 molal glucose,C6H12O6, or (b)0.10 molal NaCl solution

**science**

Animal cells and plant cells have an outer covering, a _____. Their control center is called a _______.

**medical terminology**

Medical Terminology Error Correct Term 1. Constructive Obstructive The error is on the left and the correction is on the left, I hope this helps. 2. CODP COPD 3. afonia pneumonia 4. spudum sputum 5. lower left lobe left lower lobe 6. PFT PFTs 7. eupnea apnea 8. ventolator vent...

**us history**

The ancient Greek city-state of Athens was _____.

**Math**

Suppose that $2500 is invested at an interest rate of 2.5% per year, compounded continuously. After how many years will the initial investment be doubled?

**computer science**

Please design the ¡§Classes¡¨ that will work together for the implementation of the User Case ¡§Validate User¡¨ in the ATM machine. its just want us o write a diagram..

**Math**

yes

**math**

What do you do if the bottom number of a fraction is greater than the top number and you are subtracting?

**geometry**

The bases of a trapezoid measure 1/4 and 3/8 inches, and the height is 1 inch. What is the area of the trapezoid?

**Literary Analysis and Composition**

Yeah thanks :)

**accounting**

Is it necessary for a finance manager to understand accounting if the firm has a professional accountant on staff and why?

**Finance**

Dr. J. wants to buy a Dell computer which will cost $2,788 four years from today. He would like to set aside an equal amount at the end of each year in order to accumulate the amount needed. He can earn 7% annual return. How much should he set aside? A. $823.15 B. $531.81 C. $...

**english **

Imagine you are on a local commission appointed to study the lack of proper recreation facilities for youth in your neighborhood. Decide what facilities should be recommended. Write an appropriate resolution to be presented to your county government. Remember to give the reaso...

**government**

write several paragraphs stating advantages and disadvantages to the unitary, confederate, and federal systems of government.

**Government**

how could i explain the unitary, confederate, and federal systems of government in a five hundred word essay

**Finance**

can you answer this question

**chemistry- stoichiometry problems**

i dont know

**Trig**

But my calculator also shows 9pi/8 and 11pi/8. Why do you have to add pi?

**Trig**

Find all the solutions in the interval [0,2pi). 2sin2x - sqrt(2) = 0 sin2x = sqrt(2)/2 I'm confused by the double angle. Please help.

**11th grade (World History)**

Which ruin is about 140 miles southwest from Copan?

**Science**

Name three different agents of erosion that might move a rock once it has been weathered?

**Logic**

For each of the following enthymemes, identify the premise(s) and the conclusion, and fill in any missing premises or missing conclusions. If possible, fill in what is missing in such a way as to make the arguments valid. It is possible that nothing exists. Therefore, there is...

**Math**

explain how to add 96+79 using a 300 chart? I do not know what a 300 chart is.

**Homeowork**

I basically just have trouble staying focused and doing my homework, and often get discouraged when it looks long- how can I keep myself on track, because hw is my biggest issue? Go here , with your mom. http://www.pinkmonkey.com/electricdesk/elec-desk.asp Go thru the program ...

**Germany and China**

I need to know if Germany and China both have liability insurance and what does it cover? (need references) also driving under the influence/BAC and punishment for (both countries) are selt belts required for these countries? Thank you for using the Jiskha Homework Help Forum....

**Chemistry**

I have this question in front of me concerning Methanol (CH3OH) & how geseous methanol is formed via the following thermochemical equation: CO(g)+2H2(g)¡êCH3OH(g)∆H=-90kJ . Now, it asks me (explanations should show a clear understanding of how Le Chatelier&ie...

**Debate**

Hello, I have to create a debate for my English class. I am debating a difficult topic, and I was hoping I could get some good ideas on where to start. My topic is that I have to prove that love is not nessicary for survival. Does anyone have any good ideas of how I could deba...

**math**

Concrete can be purchased by the cubic yard. How much will it cost to pour a slab that is 17 ft by 17 ft by 2 ft if the concrete costs $40.00 per cubic yard?

**Concentration increase**

Rf value is calculated by distance spot traveled divided by total distance of eluent. So if you increase polarity of eluent and the spot travels further than before, you will actually DECREASE Rf value.

**Biology**

Can anyone help me with this one question that I'm stumped on? The process by which a web-spinning spider makes a "sketch" of a web design before making a permanent web is called - A. lock-step sequence B. simulation C. trial and error D. cinch and attach Thanks ...

**novel= death on the ice english**

A website used for book summaries... That has no book summaries...

**Problem Solving Math Question**

bill purchased 4 pens for $3.32 including $.16 sales tax.FIND THE cost of 1 pen. Write an equation Then Solve

**math**

what do we call numbers that cannot be arranged into 2-row arrays? A matrix of order 2 x n. n is the number of entires in each row.

**English**

Which of the following sentences has a compound predicate? A. She raced along the path to beat him to the beach. B. While he swam, she collected shells. C. She washed the shells and dried them in the sun. D. She placed the shells in a plastic bag while he dried himself off. Wh...

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