# Posts by rob

Total # Posts: 394

**Calculus**

Find the distance traveled by a particle with position (x, y) as t varies in the given time interval. x = cos^2 t, y = cos t, 0 ? t ? 9? and the length of the curve so far i got ?0 to 9pi ?((-2cos(t)sin(t))^2+(-sint)^2) I am having trouble integrating from here

**Math - combinatorics/ permutations**

There are nine differently-titled books on a shelf. Four books have red covers, while the other five have black covers. How many different arrangements of the books can there be, if (a) there are no restrictions on the order in which the books are placed? Is it 9! ? (b) all ...

**Math (Confused)**

A certain economy's consumption function is given by the equation C(x)=0.75x+5 where C(x) is the personal consumption expenditure in billions of dollars and x is the disposable personal income in billions of dollars. Find C(0), C(50), and C(100). a. C(0)=42.5, C(50)=5, C(...

**Math Help**

A server purchased at a cost of $108,000 in 2002 has a scrap value of $18,000 at the end of 5 years. Find the linear equation expressing the server's book value at the end of t years. a- V(t)=108,000 b- V(t)=108,000t-18,000t c- V(t)=18,000t+108,000 d- V(t)=18,000t e- V(t)=...

**Chemistry a level**

A solution of potassium permanganate (KMnO4) was standardised by titrating with 0.20 g of Na2C2O4 dissolved in 50 cm3 of acidified water. The endpoint was reached after 23.10 cm3 of solution had been added. Calculate the molar concentration of KMnO4 in the solution.

**Management**

Which of the following is not a good reason to engage a strategic-planning consultant? 1) Consultant's experience with other organizations 2) participants free to focus on the discussion 3)Improved quality of participation 4) low price 5) "group think" avoided

**ART APPRECIATION**

_______ creates movement in a piece.

**Precalculus**

Write the sum using sigma notation. -3/8 + 4/7 - 5/6 + 6/5 - 7/4+ 8/3

**Math - volume about y axis**

Oh wait, shouldnt the limits be [0,-1] not [0,1]? Also is the answer then pi/2?

**Math - volume about y axis**

Thanks. Would that just be answer, or would I need to multiply the integral by 2?

**Math - volume about y axis**

Find the volume generated by revolving the region enclosed above by the x-axis and the graph of the function f(x) = x^2 -1 about the y-axis. I cant make sense of it. What is it asking me to do? What are the integral bounds?

**Math - integrals**

Oh, thank you. The 5∫3 just mean the upper and lower limts, I didn't know how else to write it

**Math - integrals**

Would it be possible to give me a more step by step? Im lost

**Math - integrals**

Use the sub x-1 = sqrt(5)tan(u) to evaluate 5∫3 1/(x^2-2x+6)^3/2 I don't know how to use the substitution

**math**

16cm

**Physics**

I wish i could help, i just know we both gon get rekt in phys140 together

**Physics**

A 70 kg student holds a 2.0 kg mass in each hand and is sitting on a stool that can rotate freely about a vertical axis. With the masses held at arm’s length (0.9 m) the student is set spinning at 1.2 revolutions per second. a. If we approximate the student as a uniform ...

**math**

.4 The probability of two independent events occurring in succession is the product of the two events' independent probabilities. .22 = that product. Because we know the probability of the first being red and the second not being red (.33), we know the probability of the ...

**algebra**

In a theater that will hold 180 people. The cost for each adult is $16 and each student $8. for every two adults there is one student.How many adults and students each will maximize your profit/

**English**

What type of literary device? " At that instant he took a pistol out of his pocket and held the ice cold block at my head"

**PHYSICS**

Yuvi is trying out for the track & field team and wants to give long jump a try. He currently can reach a distance of 5.90 m when leaving the ground at an angle of 30.0°. (a) What is his takeoff speed? (b) If Yuvi could increase his takeoff speed 5.0%, how much further ...

**Physics**

Yuvi is trying out for the track & field team and wants to give long jump a try. He currently can reach a distance of 5.90 m when leaving the ground at an angle of 30.0°. (a) What is his takeoff speed? (b) If Yuvi could increase his takeoff speed 5.0%, how much further ...

**Math**

A world record was set in Eco-Marathon by a french team in 2003 called Microjoule with a performance of 10,705 miles per gallon. The microjoule runs on ethanol. If the cars are given 100 grams of ethanol (specific gravity = .789) and drive until the fuel runs out, how far did ...

**Finance**

What is the value of a building that is expected to generate fixed annual cash flows of 124,250 dollars every year for a certain amount of time if the first annual cash flow is expected in 3 years from today and the last annual cash flow is expected in 9 years from today and ...

**Algebra**

A boat has a speed of 20 mph in still water. While traveling on a river at top speed, it went 40 miles upstream in the same amount of time it went 60 miles downstream. Find the rate of the river current.

**Math**

It takes an older pump 4 times as long to drain a certain pool as it does a newer pump. Working together, it takes the two pumps 4 hours to drain the pool. How long will it take the older pump to drain the pool working alone?

**msth**

My tens digit is 3 more than 5.My tens digit is double the number of my ones digit. What number am I?

**Physics**

A punter drops a .43 kg football from rest vertically 1 meter down onto his foot. The ball leaves his foot with a speed of 18m/s at an angle of 55* above the horizontal. What is the impulse delivered by the foot (magnitude and direction)?

**Physics**

A marble and a cube are placed at the top of a ramp. Starting from rest at the same height, the marble rolls without slipping and the cube slides (no kinetic friction) down the ramp. Determine the ratio of the center-of-mass speed of the cube to the center-of-mass speed of the...

**math**

Ms. Handler walks to work at an average speed of 5 kilometers per hour. If she increases her speed to 6 kilometers per hour, she will save 10 minutes. Find the distance she walks.

**English**

bravery

**Science**

wang

**physics**

light from the sun travels 1.5x10km to reach the earth .how long does it journey take in minutes?

**Functions**

Determine algebraically whether the function f(x)=2x^42x^2 2x+1 is odd, even or neither.

**Functions**

Suppose w=j(h) is the average daily quantity of water (in litres) required by an oak tree of height h metres. If Wa is the quantity of water required by a tree of average height, write an expression for the height of a tree 10 m higher than the average. Show step by step ...

**Business math**

31654.70

**math**

Tall versus Short All tall 787 tall 277 short Smooth versus Wrinkled Seeds All smooth seeds 5,474 smooth 1,850 wrinkled Yellow versus Green Seeds All yellow seeds 6,022 yellow 2,001 green From the table and the theoretical results answer questions 1 and 2. 1) Assume that we ...

**Physics**

james is a dick head. F=ma mg-T=ma (4.5)(9.8)-T=4.5a Torque=I(alpha fish) I=1/2MR^2 TR=1/2MR^2(a/R) 1.5T=(1/2)(2.0)(1.5^2)(a/1.5) T=1a substitute for T 44.1-a=4.5a 44.1=5.5a a=8.02m/s^2 substitute for a T=8.02N

**Finance**

740.28

**Physical Science**

yes

**Physics**

It is the also 1/0.747 or 1.376

**PHYSICS**

2.- A man of 73 kg has a volume of 75 l, of which 5 l correspond to the lungs. (a) Calculate the volume of the lungs when going in apnea underwater to a depth of 10 m, assuming that the density of sea water is 103 kg/m3 . (b) At that depth, will the total forces acting on him ...

**band**

I need to label all my music notes correctly for the guitar and be able to find those notes on the guitar.I also need to tune my guitar with out a tuner.

**Algebra**

Well you see Bob, first you would use the commutative property and change it to some thing like this: (7.8* 800) *10 to the 12th= (7.8*80,000) *10 to the 10th.

**ph**

A coin slides over a frictionless plane and across an xy coordinate system from the origin to a point with xy coordinates (3.0 m, 5.8 m) while a constant force acts on it. The force has magnitude 2.8 N and is directed at a counterclockwise angle of 100° from the positive ...

**eng**

google it

**eng**

what exactly does destiny mean and please don't tell me to google it because everytime i to, i keep getting confused. and also do u believe that destiny plays a role in our lives or no? and why?

**Physics**

Can someone, please help me out with this question. A uniform rectangular 91.21 kg refrigerator with height h = 2.069 m and width w = 1.153 m is pushed at a constant velocity across a level floor. The refrigerator is pushed in the horizontal direction halfway between the floor...

**physics**

If the mass of the skier is 50 kg, what is the magnitude of the force of kinetic friction on the skier? Be sure to show your work, and use g = 10 m/s^2 for the magnitude of acceleration due to gravity. Sin 30degrees = 1/2 Cos 30degrees = square root 3/4 Tan 30degrees = square ...

**Math**

im doing this now HELLLLP

**Physics**

Displacement vector A with arrow points due east and has a magnitude of 2.62 km. Displacement vector B with arrow points due north and has a magnitude of 2.26 km. Displacement vector C with arrow points due west and has a magnitude of 1.4 km. Displacement vector D points due ...

**Algebra 1**

w=10

**English**

Please help is this a good thesis? Students should not be required to wear uniforms in public schools , schools should focus more on education rather than what the student is wearing.

**Math Finance**

Word problem asks to find rate of interest on a monthly deposit for a sinking fund that is needed to produce 130,000 in 20 years. I applied the model, (fv/pv)^1/t -1 I use n/t if compounding yearly, quaterly, etc. No matter what I've tried I can't produce the interest ...

**physics**

a skater is sliding forward on a flat rink at 6 m/s. her mass is 71 kg. the sliding friction acting on her skate blade is 13.4 N acting backward. air resistance is 14.7 N acting backward. what is her horizontal acceleration?

**Englis**

remembered watching it the first time, and realizing I’d never seen anything like it, immediately vowed never to miss an episode of the Daily Show.

**Geometry**

Ann went on a 10 hour bicycle trip. The graph models the relationship between the time and the total distance traveled by Ann. The table shows selected points on the graph. T=0,1,4,7,10 d(t)=0,3,5,5,10 draw a graph of anns speed in mph in terms of the time in hours.

**geography**

5160

**Math economics HELP!!!**

Can someone please help me with a hint to solve this problem?? I'm struggling really hard with this. Thanks!!! "Consider an oligopolistic market with two firms. Each of them produces using a cost function given by c(q)=q^2. The aggregate demand in the market is given ...

**emily**

hit me up

**Math**

Chad buys peanuts in 2 pound bags. He repackages them into bags that hold 5/6 pound of peanuts. How many 2 pound bags of peanuts should Chad buy so that he can fill the 5/6 pound bags without having any peanuts left over?

**MATH**

A landowner wants to fence in a rectangular area of 75000 square metres and divide it into three parts with two parallel fences both parallel to one side of the rectangle. Each part will have a different grazing crop for the herds. What is the shortest total length of fence ...

**Math**

Put in order from least to greatest: 0.748 11/16 76%

**math**

on a scale of 2 inches = 3 feet what is the width ?

**Solar Energy please help**

Pls help with the question d) e) f)

**English**

@Mia, for someone who is a story teller, you sure do know how to "spell" hahaha!

**math iv**

When the directions include the words "0 < Theta < 90" what type of problem does that infer?

**math**

Given ABCD with A = (1,1),B = (4, 2), C = (4, 5), and D = (1, 4),what are the coordinates for Point D' if the y-axis is the reflecting line?

**Math 17 Synthetic Division**

Using synthetic division, divide (x^6)(y^6) by x-y. please show the process. THANK YOU! :)

**Math 17**

What is the proof of theorem 2.23, where (b/a)+(d/c)=[(bc)+(ad)]/(ac). Thank you :)

**math**

If a man runs for an hour and a half at 8 miles an hour Due south and then he continues south on a bus traveling 55 miles an hour for 24 minutes how far did you travel

**Statistics**

A study of 420,048 cell phone users found that 135 of them developed cancer of the brain or nervous system. prior to this study of cell phone use the rate of such cancer was found to be 0.0333% for those not using cell phones. Complete parts (a) and (b) a. use the sample data ...

**Statistics**

Use the given data to find the minimum sample size required to estimate a population proportion or percentage. Margin of error: five percentage points; confidence level 90% from a prior study, ^p is estimated by the decimal equivalent 56% n= (Round up to the nearest integer)

**Statistics**

Use the given data to find the minimum sample size required to estimate a population proportion or percentage. Margin of error: 0.06; confidence level 90% ^p and ^q unknown n= (round up to the nearest integer)

**Statistics**

Use the sample data and confidence level to construct the confidence interval estimate of the population proportion p. n=500, x=350, 90% confidence ?<p<? (Round to three decimal places as needed.)

**Statistics**

Assume that a random sample is used to estimate a population proportion p. Find the margin of error E that corresponds to the given statistics and confidence level. 95% confidence the sample size is 2096 of which 25%are successes The margin of E= (round to four decimal places ...

**Chemistry**

How many milliliters water are needed to make a 0.171 M solution that contains 1.00 g of NaCl?

**Chemistry**

Sketch the titration curve for the tirtation of (0.10M) HCl vs 25.0mL (0.50M) NaOH

**Chemistry**

What are the reducing agent and the oxidising agents in the synthesis of ammonia from hydrogen and nitrogen?

**physics**

Starting from rest, a 10.7 kg block slides 2.60 m down to the bottom of a frictionless ramp inclined 30.0° from the floor. The block then slides an additional 4.70 m along the floor before coming to a stop. (a) Determine the speed of the block at the bottom of the ramp. m/...

**maths**

poke fun

**Physics**

Two wires run from the top of a pole 2.6m tall that supports a volleyball net. The two wires are anchored to the ground 2.0m apart, and each is 2.0m from the pole. The tension in each wire is 100N. here are the dimensions. I do not understand how to setup work. if could show I...

**physics**

sorry distances are in meters and tension is in Newtons.

**physics**

Two wires run from the top of a pole 2.6 tall that supports a volleyball net. The two wires are anchored to the ground 2.0 apart, and each is 2.0 from the pole. The tension in each wire is 100. I do not understand how to setup work. if could show I would get better ...

**dynamics**

If it is released from rest at a height of h = 2 ft from the top of the uncompressed spring, determine the speed of the collar after it falls and compresses the spring 0.9ft .

**Finance**

Bond with $1000 par value and a contract interest rate of 10.8%. Bonds current market rate is $1123 and matures in 10 years. Marginal tax rate is 34%. What is the cost of capital from this bond debt?

**Chemistry- Naming compounds Nomenclature**

i am having trouble with this compound. Molybdenum (VI) Chromate I'm have it find its formula and can't seem to get it. Thanks for the help.

**physics**

A car is traveling at 25m/s when an accident occurs. The car decelerates 300m/s^2 but the passenger does not slow down because he is not wearing a seatbelt. a) Supposing the distance between the passenger and the dashboard is initially 0.50m, what will be the speed of the car ...

**Algebra**

Evaluate e^0.1 to four decimal places

**Chemistry**

You're right. My mistake! Thank you...

**Chemistry**

I have this question which I believe I solved correctly, but I was wondering if someone could look it over to make sure? The question is... Assay for Vitamin A (a fat soluble vitamin) required an extraction step into ether. In this assay, 2.00 mL of serum are extracted into 5....

**chemistry**

what is the balanced equation for the reaction of potassium dichromate and potassium hydrogen phthalate?

**Chemistry**

Use the data given below to construct a Born - Haber cycle to determine the electron affinity of Br? DH°(kJ) K(s) → K(g) 89 K(g) → K⁺(g) + e⁻ 419 Br2(l) → 2 Br(g) 193 K(s) + 1/2 Br2(g) → KBr (s) -394 KBr(s) → K⁺(g) + Br⁻...

**calculus**

For y(x)=ln(3+x2), find y(6)

**physics 100**

What minimum speed does a 160 puck need to make it to the top of a 5.4 -long, 24 frictionless ramp?

**Lies**

unattractive

**Physics... Help!**

A bullet of mass m=0.060 kg hits a 5.0 kg block with an initial speed of 225 m/s. The block is connected to a spring that is attached to a wall. The friction between the block and the table is negligible. Upon impact, the bullet bounces back from the box with a speed of 75 m/s...

**ALG 2!!!**

10x - 35 = 33 - 18x -12 28x = 56 x = 2

**Physics--Please Help!!**

A bullet of mass m=0.060 kg hits a 5.0 kg block with an initial speed of 225 m/s. The block is connected to a spring that is attached to a wall. The friction between the block and the table is negligible. Upon impact, the bullet bounces back from the box with a speed of 75 m/s...