Thursday

May 7, 2015

May 7, 2015

Total # Posts: 6,620

**calculus**

Differentiate both sides of the double angle identify sin 2x= 2 sin x cos x to determine an identify for cos x. Find the first derivative, second derivative, third fourth, fifth, sixth, seventh and eighth derivative. Use the results to find the twelfth and fifteenth derivative...
*February 21, 2012*

**chemistry**

In a lab experiment I added Br2 to hydrocarbons cyclohexane, cyclohexene, and toluene. A loss of color would indicate a reaction took place. Only the cyclohexene lost color and turned clear. I guess this means that the Br2 broke the cyclohexenes double bonds but why didn't...
*February 20, 2012*

**chemistry- solubility**

hydrocarbons nhexane, cyclohexane, and toluene are are insoluable in H2O (i assume because the hydrocarbons are non polar and water is polar) but why are these three hydrocarbons soluable in CH2Cl2?
*February 20, 2012*

**pre-cal**

a) S=cA^k b) A=2Ao K=2 S=c(2Ao)^2=c*2^2*Ao^2 S=4cAo^2 therefor the # of species increased by 4.
*February 19, 2012*

**Visual Literacy**

What are the factors that determine whether or not a print design can be classified as "good design?"
*February 18, 2012*

**Algebra**

STILL DONT GET THIS can anyone explain me this please a cylinder has a volume of 19cm^3. If the radius is doubled, what is the volume of the new cylinder? HOW TO DO THIS
*February 18, 2012*

**Algebra**

so answer is 1216
*February 18, 2012*

**Algebra**

a cylinder has a volume of 19cm^3. If the radius is doubled, what is the volume of the new cylinder? HOW TO DO THIS
*February 18, 2012*

**Calculus**

An infinite number of points lie on the curve and there is a tangent line at every point. So may they were asking how many times the tangent not exists. The tangent would not exist if the derivative was undefined at some point. Since the derivative is a polynomial it is ...
*February 18, 2012*

**Calculus**

v(t)=s'(t)=150-32t set s(t)=200 find out when the rock is 200 feet above the ground. 200=150t-16t^2 t=(5/16)+or-(15-sqrt(97)) 0=150t-16t^2 t=75/8 not 0 because it started on the ground the velocity when it strikes the ground is v(75/8)=-150 the other velocity is v((5/16)+...
*February 18, 2012*

**artist**

What inspired Pablo Picasso to paint Weeping woman? Please give some historical context. Thanks
*February 18, 2012*

**Physics help please!!!**

so 570rpm*2pirad = 3581.415625 i divide that with rev*1min/60 sec == 59.69 is that correct ??
*February 18, 2012*

**Physics help please!!!**

The angular speed of digital video discs (DVDs) varies with whether the inner or outer part of the disc is being read. (CDs function in the same way.) Over a 133 min playing time, the angular speed varies from 570 rpm to 1600 rpm. Assuming it to be constant, what is the ...
*February 18, 2012*

**physics**

Consider a frictionless track as shown in the figure below. A block of mass m1 = 4.20 kg is released from A. It makes a head on elastic collision at B with a block of mass m2 = 9.00 kg that is initially at rest. Calculate the maximum height to which m1 rises after the collision.
*February 17, 2012*

**Geometry**

140
*February 17, 2012*

**Physics please help its urgent i need help **

A crate of oranges weighing 209 N rests on a flatbed truck 2.0 m from the back of the truck. The coefficients of friction between the crate and the bed are μs = 0.41 and μk = 0.20. The truck drives on a straight, level highway at a constant 7.5 m/s. (a) What is the ...
*February 16, 2012*

**Physics to drwl please help**

A crate of oranges weighing 209 N rests on a flatbed truck 2.0 m from the back of the truck. The coefficients of friction between the crate and the bed are μs = 0.41 and μk = 0.20. The truck drives on a straight, level highway at a constant 7.5 m/s. (a) What is the ...
*February 16, 2012*

**Social Studies**

D I think
*February 16, 2012*

**Wow is there no one to help with physics???**

I got the rest bobpursley but for some reason am not getting the right answer for part b which friction=ma but when i put 209(2.1) the answer isnt right
*February 16, 2012*

**Wow is there no one to help with physics???**

Thanks bobpursley
*February 16, 2012*

**Wow is there no one to help with physics???**

How would you know its all me?
*February 16, 2012*

**Wow is there no one to help with physics???**

A crate of oranges weighing 209 N rests on a flatbed truck 2.0 m from the back of the truck. The coefficients of friction between the crate and the bed are μs = 0.41 and μk = 0.20. The truck drives on a straight, level highway at a constant 7.5 m/s. (a) What is the ...
*February 16, 2012*

**Physics helppp**

A crate of potatoes of mass 9.0 kg is on a ramp with angle of incline 30° to the horizontal. The coefficients of friction are μs = 0.69 and μk = 0.41. Find the frictional force (magnitude and direction) on the crate if the crate is at rest. magnitude N? thanks
*February 16, 2012*

**math**

Thank you very much. That is what I thought it was, but I wasnt sure.
*February 16, 2012*

**math**

You are designing a rain gutter made from a piece of sheet metal that is 1 foot by 5 feet. The gutter is formed by turning up two sides. You want the rain gutter to have the greatest volume possible. Below is the polynomial function that represents the volume of the gutter. ...
*February 16, 2012*

**math**

2/3+7/9
*February 15, 2012*

**math**

2,500
*February 15, 2012*

**Calculus (Integrals and Derivatives)**

It would be -28. For future notice, the integral is going from the interval -3 to 1(from point a to b)...this information will come in handy if you have to take physics
*February 15, 2012*

**Physics**

Locomotive exert on a 12560-kg boxcar to make it accelerate forward at 0.38 m/s2. How long will it take the boxcar to reach its cruising speed of 112 km/h (69.6 mph or 31.1 m/s)?
*February 15, 2012*

**Math**

If I financed a computer that costs $1500. If the simple interest rate is 21%, how much will the I owe after one month if no payments are made?
*February 15, 2012*

**math: elapsed time**

um any other websites
*February 15, 2012*

**math: elapsed time**

somebody answer this question, i really need help!
*February 15, 2012*

**math: elapsed time **

i need a website that would teach me every thing about elapsed time. it's really kind of confusing to me
*February 15, 2012*

**11Science**

Inherited traits
*February 15, 2012*

**math**

so it would be like, 5/8 ? 6/7 8,16,24,32,40,48,56,64 7,14,21,28,35,42,49,56 LCD IS 56 so now i do 56/7=8*6=48 6/7=48/56 56/8=7*5=35 so, 5/8=35/56 5/8 (35/56) < 6/7 (48/56)
*February 14, 2012*

**math**

so it's like you do this -> 2,4,6,8,10,12 3,6,9,12,15,18,21 4,8,12,16,20 and one more question, what about the numerators? like if you're comparing 3/8 to 2/5 the common multiple is 40. the numerators?
*February 14, 2012*

**math**

how do you change them into equivalent decimals and same denominators?
*February 14, 2012*

**math**

how to you compare 8 fractions with different denominators including improper fractions?
*February 14, 2012*

**Chemistry**

How would you prepare 10.0 Liters of a solution that was 20 parts per million sodium perchlorate in water? What would be the molarity of the solution (assume density is 1.0 g/mL and 1ppm=1 mL/L)?
*February 14, 2012*

**Social Studies 7R - DBQ Essay Check**

yes. really n.o.c
*February 13, 2012*

**geometry**

3x + y + 7 + 90 = 180 deg. how to solve?
*February 13, 2012*

**physics**

differentiate between density,mass and volume. state a formula in terms of mass density and volume. using the formula calculate the volume of a 10kg block of ice
*February 12, 2012*

**statistics**

A professor teaches two different subjects (history and sociology) in an ethnically diverse college. She wants to know how much interest students have in prominent political figures. She reasons that knowing this will help her plan for future lectures. She asked students to ...
*February 12, 2012*

**statistics**

Now, let’s look at a situation in which we compare three college math teachers to each other with respect to how interested they keep their students. The study was conducted among freshmen enrolled in an introductory course. The unit was quadratic equations. Students were...
*February 12, 2012*

**statistics**

. A professor is interested in knowing the correlation, if any, of students’ scores on the first and second exams given in his class. Test 1 Test 2 92 86 90 87 89 85 82 90 88 79 92 90 100 92 91 84 Is there a significant correlation? Explain its statistical significance, ...
*February 12, 2012*

**statistics**

A professor is interested in knowing the correlation, if any, of students’ scores on the first and second exams given in his class. Test 1 Test 2 92 86 90 87 89 85 82 90 88 79 92 90 100 92 91 84 Is there a significant correlation? Explain its statistical significance, if ...
*February 12, 2012*

**statistics**

An art professor was interested in seeing what size group is best to prime the pump so to speak to encourage strangers to gather together in front of various exhibits at her art show, so she set up an experiment. In a municipal building off campus, she asked a group of two ...
*February 12, 2012*

**english**

dont fear th1 Crush" - Garbage Local God - Everclear "Angel" - Gavin Friday "Pretty Piece of Flesh" - One-Inch Punch Kissing You (Love Theme from Romeo + Juliet) - Des'ree – "Whatever (I Had a Dream)" - Butthole Surfers Lovefool - ...
*February 12, 2012*

**english**

i need to create a eight song soundtrack and how they relate to romeo and juliet play.
*February 12, 2012*

**english**

i need to find eight songs so i can put on asound track and how they relate to eight acts it can be any eight acts
*February 12, 2012*

**english**

i need to chose at least 8 songs and how they relate to romeo and juliet acts
*February 12, 2012*

**Math**

Log8 4 + log16 2 x log 27 81= x solve for x
*February 11, 2012*

**Physics**

A 0.13 kg bullet traveling at 614 m/s hits a 5.7 kg block of wood and stays in the wood. What is the velocity (speed)of the wood block immediately after the bullet hits it
*February 11, 2012*

**Chemistry**

What volume of 6.00 M nitric acid is needed to prepare 250. mL of 0.750 M nitric acid?
*February 9, 2012*

**Chemistry**

What mass of KH2PO4 is needed to prepare 500.0 mL of a 0.067M solution?
*February 9, 2012*

**math**

A rectangular lot has an area of 216.795 square meters and a width of 9.7 meters. Nick calculated the length of the lot to be 2.235 meters. Without solving, is Nick's calculation correct?
*February 8, 2012*

**physics**

a point charge q2 equals negative 2.1 micro C is fixed at the origin of a coordinate system. another point charge q1 equals 4.1 micro C is initially located at point p a distance d1 equals 6.1 centimeters from the origin along the x axis
*February 8, 2012*

**chemistry**

In a coal-fired electric generating plant, the coal is pulverized before being mixed with air in the incinerator. Use the collision theory to explain why the coal is pulverized.
*February 8, 2012*

**algebra**

Simplify 1+2/x / 1/x - 2/x^2
*February 8, 2012*

**Math**

Can you help me solve this problem? Cuz i cant seem to figure it out. An orbiting satellite traveled 3,225 miles in 40 minutes. Find its speed in miles per hour. (Round your answer to the next whole number.) (a)103 (b)4,838 (c)4,267 (d)6,200 (e)150
*February 6, 2012*

**Finance**

What is the present value (or purchase price) of an annuity product which will pay you $2,000 at the end of each year for the next 15 years? Use an interest rate of 9%.
*February 6, 2012*

**Math**

A scale model of a house is 1 foot long. The actual house is 50 feet long. In the model, the window is 1 1/5 inches high. How many feet high is the actual window?
*February 6, 2012*

**physics**

a 2.5 kg mass is connected to a spring. when a 4N is applied to the spring it compresses 2cm. if the spring is stretched and then the mass is released, what would be the period of the motion.
*February 5, 2012*

**physics**

Normally the rate at which you expend energy during a brisk walk is 3.6 Calories per minute. (A Calorie is the common unit of food energy, equal to 4184.1 J.) How long do you have to walk to produce the same amount of energy as a 100 W lightbulb that is lit for 8.4 hours? ...
*February 5, 2012*

**physics**

Normally the rate at which you expend energy during a brisk walk is 3.6 Calories per minute. (A Calorie is the common unit of food energy, equal to 4184.1 J.) How long do you have to walk to produce the same amount of energy as a 100 W lightbulb that is lit for 8.4 hours? ...
*February 5, 2012*

**Math**

I tried using my calculator and punching in the choices to figure out what x is and none of them equaled -10 so idk what i did wrong Find the value of x that will make the following numerical expression equal to − 10 . -5^2+(x+2)/-4-(-6) (a)−1 (b)−3 (c)2 (d)1...
*February 4, 2012*

**Chemistry**

Yea I could have used the help on this question instead of answering a question with a question. I needed to know the set up, clearly I'm not entirely sure. I see you do this on a few posts Dr. Bob
*February 4, 2012*

**Physics**

In a game of American football, a quarterback takes the ball from the line of scrimmage and runs backwards for 10 yards, and then sideways to the left, parallel to the line of scrimmage for 15 yards. At this point, he throws a forward pass at the angle of 60 degrees with ...
*February 2, 2012*

**college algebra**

an isosceles triangle has at least two sides of equal length. Determine whether the triangle with vertices (0,0), (3,4),(7,1) is isosceles.
*February 2, 2012*

**Physics**

A basketball is released from a height of 3m onto a hard surface. What height will the ball rebound to and why ?
*February 2, 2012*

**math**

20 mg = 20 x 10^-3 g 90 mcg = 90 x 10^-6 g no. of doses = 20 x 10^-3 / 90 x 10^-6 = 222
*February 2, 2012*

**Physics**

Can you please explain how to find time by using step by step.
*February 1, 2012*

**Physics **

urprisingly, very few athletes can jump more than 2.2 ft (0.66 m) straight up. Use d = 1/2 gt2 and solve for the time one spends moving upward in a 2.2 foot vertical jump. Then double it for the "hang-time" -- the time one's feet are off the ground.
*February 1, 2012*

**math**

Gwen was planting tomato plants in a row 6 2/3 yards long. She put the plants 2/3 yard apart. How many plants were in the row?
*February 1, 2012*

**chemistry**

if 3.60g of NaCl is dissolved into 75.00mL of water, what is the concentration of this salt solution, in m/v%?
*January 31, 2012*

**math**

10 friends share 7 dollars,what is the fraction?
*January 31, 2012*

**math**

marcia said that if she estimates 73 x 7 ,the product will be less that the exact answer. is she correct ? explain.
*January 31, 2012*

**Calculus**

Use the method of cylindrical shells to find the volume V generated by rotating the region bounded by the? Use the method of cylindrical shells to find the volume V generated by rotating the region bounded by the given curves about y = 8. 27y = x^3, y = 0, x = 6 V=
*January 31, 2012*

**programming**

Write pseudocode (using pascal) to accept as input names of an unspecified number of equipment rented, the name of the company, the number of days the equipment was rented for and the sales amount. The algorithm must determine the number of times each type of equipment was ...
*January 30, 2012*

**programming**

Write pseudocode to accept as input names of an unspecified number of equipment rented, the name of the company, the number of days the equipment was rented for and the sales amount. The algorithm must determine the number of times each type of equipment was rented, as well as...
*January 30, 2012*

**Math**

If REINY was reading story problems and if he did not know the algorithm steps to share to a simple problem, would he have time to be sarcastic?
*January 29, 2012*

**math**

126 books were donated to the school. there are seven classes and each will get an equal number of the books for its classroom library. how many books will each classroom get?
*January 29, 2012*

**COLLEGE MATH- SYSTEMS OF EQUATIONS**

a. A movie theater sold 450 tickets to a movie. Adult tickets cost $8 and children's tickets cost $6. If the theater took in a total of $3,250 from ticket sales, how many of the tickets were adult tickets and how many were children's tickets?
*January 29, 2012*

**college soc 120**

utilitarianism, deontology, and virtue ethics of gay marriage
*January 29, 2012*

**algebra**

mary went to the store for some fruit. The apples were $1.00 per pound and the oranges were $0.50 per poumd. She spent $5,00 all together and took home a total of 8 pond of fruit. How many ponds of apples and oranges did she buy?
*January 27, 2012*

**soc.**

The outlawing of slavery and extending voting rights to women seem to indicate that ethics can have beneficial results. Give an example from the past that indicates a similar result or a current social policy that might be regarded as wrong, which therefore needs to be changed...
*January 26, 2012*

**Math**

Solve for x in terms of y: y = (x^3/4)-(x^2/3)-(x/2)+3cosx
*January 26, 2012*

**physics**

in the hydraulic machine shown, you observe that when the small piston is pulled down 10cm, yhe large piston is raised 1 cm. if the small piston is pushed down with a force of 100n, what is the most weight that the large piston can support?
*January 26, 2012*

**geometry**

Lines M and T are parallel with a Transversal line P. [Labeling for the angles on line P intersecting M are, top right corner is angle 1, the top left is angle 2, the bottom left is angle 3, and the bottom left is angle 4. This pattern {top left, top right, bottom left, bottom...
*January 25, 2012*

**math**

How many branches will the number 17 have in its completed factor tree?
*January 25, 2012*

**math**

What is the value of point X on the number line?
*January 25, 2012*

**Physics**

10.6
*January 24, 2012*

**math**

John studied for 22.5 hours over a period of 3.5 days. On average, about how many hours did he study each day?
*January 24, 2012*

**physics**

Two boats start together and race across a 42 km wide lake and back. Boat A goes across at 42 km/h and returns at 42 km/h. Boat B goes across at 21 km/h, and its crew, realizing how far behind it is getting, returns at 63 km/h. Turnaround times are negligible, and the boat ...
*January 22, 2012*

**physics**

Two boats start together and race across a 42 km wide lake and back. Boat A goes across at 42 km/h and returns at 42 km/h. Boat B goes across at 21 km/h, and its crew, realizing how far behind it is getting, returns at 63 km/h. Turnaround times are negligible, and the boat ...
*January 22, 2012*

**physics**

Two boats start together and race across a 42 km wide lake and back. Boat A goes across at 42 km/h and returns at 42 km/h. Boat B goes across at 21 km/h, and its crew, realizing how far behind it is getting, returns at 63 km/h. Turnaround times are negligible, and the boat ...
*January 22, 2012*

**physics**

Two boats start together and race across a 42 km wide lake and back. Boat A goes across at 42 km/h and returns at 42 km/h. Boat B goes across at 21 km/h, and its crew, realizing how far behind it is getting, returns at 63 km/h. Turnaround times are negligible, and the boat ...
*January 22, 2012*

**physics**

Three point charges are fixed in place in a right triangle. What is the electric force on the q = -0.63 µC charge due to the other two charges? (Let Q1 = +0.83 µC and Q2 = +0.9 µC.) what is the magnitude N, and direction in degrees ° above the positive x-...
*January 22, 2012*

**physics**

A rocket moves straight upward, starting from rest with an acceleration of +25.5 m/s2. It runs out of fuel at the end of 4.26 s and continues to coast upward, reaching a maximum height before falling back to Earth. (a) Find the rocket's velocity and position at the end of ...
*January 22, 2012*

**physics**

A rocket moves straight upward, starting from rest with an acceleration of +25.5 m/s2. It runs out of fuel at the end of 4.26 s and continues to coast upward, reaching a maximum height before falling back to Earth. (a) Find the rocket's velocity and position at the end of ...
*January 22, 2012*