Wednesday

April 1, 2015

April 1, 2015

Total # Posts: 255

**physics**

A flat (unbanked) curve on a highway has a radius of 220m. A car rounds the curve at a speed of 25m/s. What is the minimum coefficient of friction that will prevent sliding?
*March 28, 2015*

**Algebra**

Find the following sum: 9 + 10 + 11 + ... + 87
*January 29, 2015*

**Math**

You are buying a fence to enclose a garden that has an area of 360 square feet. x + 9 The bottom of garden x side of garden a) What is the width of the area to be enclosed? Answer in units of ft b) How much fencing do you need? Answer in units of ft
*January 28, 2015*

**Chemistry**

How many mL of 0.122 M Na2CO3 would be needed to precipitate all of the copper ions in 23.7 mL of 0.167 M CuSO4? How many grams of CuCO3 could be recovered?
*November 4, 2014*

**Math**

A kitchen floor measures 10ft by 12 ft. Calculate the minimum area and maximum area using the greatest possible error
*October 27, 2014*

**Algebra**

The cost for a student ticket to a basketball game is $1 and a non student ticket is $2. The total sales for the game were $460 with 360 tickets sold, how many student tickets were sold?
*October 20, 2014*

**Algebra 1**

-5x-12<13 or -6x+8>50
*September 2, 2014*

**Algebra 1**

-5x-12<13 or -6x+8>50
*September 2, 2014*

**physics**

A car with a mass of 2,000 kg has a kinetic energy of 900,000 J. How fast is it traveling?
*May 21, 2014*

**physics**

At the top of a hill, a roller coaster has 67,500 J of kinetic energy and 290,000 J of potential energy. Gradually, the roller coaster comes to a stop due to friction. If the roller coaster has 30,000 J of potential energy when it stops, how much heat energy is generated by ...
*May 21, 2014*

**math**

missing dimension, 14yd, v=489yd3
*April 2, 2014*

**west morgan**

find missing dimension cone, r=5in, v=487in3
*April 2, 2014*

**Calculus Rate of Change**

Find the average rate of change h(x)=2x^2-4 from x=2 to x=6 Simplify your answer as much as possible
*March 25, 2014*

**Trigonometry**

Graph the function y=2sin(x-2pi/3). To draw the graph, plot all x-intercepts, minima and maxima within on period. I need to graph at least 5 points. I have -pi, 0, pi, 2pi, 3pi, and 4pi along the x-axis
*March 24, 2014*

**Chemistry**

What is the molarity of an aqueous solution that is 6.44% glucose (C6H12O6) by mass? (Assume a density of 1.03 g/mL for the solution.)
*March 16, 2014*

**physics**

A 12.0 g bullet is fired into a 13.9kg wooden block that is hanging straight down, suspended by a 2.00 m length of light line. The bullet has a muzzle velocity of 94.2 m/s. When the bullet hits the block, the bullet stays in the block. The block swings outward so that the line...
*March 15, 2014*

**English**

A verb phrase that acts as a noun is called a? participial. adverbial. infinitive. gerund. Which of the following is the prepositional phrase in the sentence below? Applause came from the bleachers. A) Applause came B) came from C) from D) from the bleachers My answers: D. ...
*January 12, 2014*

**Physics**

When the end of a particular garden hose is held at a height of 1m, water flows out of it at 8 cm/s. What is the difference in fluid pressure between the end of the hose and a portion resting on the ground? Suppose I cover half of the area at the end with my thumb. What ...
*December 5, 2013*

**Physics**

Seawater has a density of about 1024 kg/m^3. In fresh water, the water line on a certain rectangular raft (8.8cm thick) moves 3.2 cm when a load of cargo is placed on it. How much will the same load of cargo move the water line in seawater? What is the pressure in fresh water ...
*December 5, 2013*

**Physics**

The gravitational acceleration on the surface of Mercury is 0.38 times that of Earth. Its radius is also about 0.38 times that of the Earth. What is the ratio of the density of Mars to that of Earth?
*December 5, 2013*

**Physics**

A particular asteroid has a circular orbit about the Sun with a radius of 450 million miles. How long does it take to go around the sun? Compare the prediction of Kepler's 2nd law to a direct computation with Newton's 2nd law. How much area does the line connecting the...
*December 5, 2013*

**Physics**

Placing a 215 g mass on a vertical spring causes a stretch of 5.1 cm. The mass is released at t=0 with y=0.15m (higher than the equilibrium hanging length) with a velocity of v=-1.3 m/s. What is the spring constant of the spring? What is the amplitude of the motion of the mass...
*December 5, 2013*

**Physics**

A particular piano wire has middle C (261.7 Hz) for its second harmonic. The wire's length is 2.7m. What is the speed of the wave in the wire? If the wire has 270 lbs of tension what is its linear density? What is the wavelength of this tone emitted into the air? Suppose ...
*December 5, 2013*

**biology**

Which provides more energy for the cell to perform its functions, cellular respiration or fermentation? Explain.
*December 3, 2013*

**math**

Question 3 Terry invests $3,000, at 10% interest, compounded semiannually for 12 years. Use the compound interest formula to calculate the compound amount for his investment. a. $9,675.30 b. $6,760.00 c. $6,663.28 d. $9,860.00
*October 31, 2013*

**Statistics**

A university has 1,000 computers available for students to use. Each computer has a 250-gigabyte hard drive. The university wants to estimate the space occupied on the hard drives. A random sample of 100 computers showed a mean of 115 gigabytes used with a standard deviation ...
*October 27, 2013*

**algebra**

1 hour=360 seconds (60*60) 1 kilometer=1000 meters to convert kilometers/hour to meters/second you can just do 1(kilometer)/1(hour)=1000(meters)/360(seconds) seeing as how you want your final answer in hours well convert the 89.44m/s train into km/h 89.44*1000/360=?km/h then ...
*October 20, 2013*

**science**

Explain the following statement: "scientific knowledge is the result of a great deal of debate and confirmation within the science community."
*October 18, 2013*

**Physics**

A dock worker applies a constant horizontal force of 80.0N to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves 10.0m in the first 6.00s. What is the mass of the block of ice?
*October 2, 2013*

**budgeting**

its not b
*August 29, 2013*

**math**

a rectangle with a perimeter 70 feet can have an area of 150 ft^2. use A(x) to demonstrate this fact algebraically and graphically.
*August 15, 2013*

**Math**

What descriptive statistical information is needed in order to determine if a current temperature of 75-degree is a departure from the average temperature of 65 for that date of the year in that particular location, if the record low is 35 and record high is 90 for that date?
*June 11, 2013*

**chemistry**

If 15 grams of table salt is used how many moles of sodium sulfate are produced
*May 14, 2013*

**math**

can you help with this one Find the area of the regular polygon. Round your answer to the nearest tenth. the individual sides are 10 the radius is 13.07
*May 4, 2013*

**math **

The area of a parallelogram is 420 centimeters squared and the height is 35 cm. Find the corresponding base. Be sure to show all work and label your answer
*May 4, 2013*

**physics**

What wavelength of sound would a bat need to detect a 1cm diameter mosquito? Also, if it took 0.3 seconds for sound to return to a moth how far away would the moth be?
*April 11, 2013*

**Alg 3**

Put the following equations in standard form. State the center and the radius. x^2-5x+y^2+4y=-3 I get how to end up with (-2.5,2), what is the radius?
*April 3, 2013*

**MATH**

Radical equation, with a graphing calculator to the nearest thousandth?? 1 over /pi x-3+ sq2over/ 2.7x = 1.8??
*March 11, 2013*

**Physics**

I came here earlier with this question: "A force of 20 N acts toward the west. Another force acts at the same point so that the resultant of the two forces is zero. What is the magnitude and direction of the second force?" I was wondering if someone could explain to ...
*March 5, 2013*

**Physics**

A force of 20 N acts toward the west. Another force acts at the same point so that the resultant of the two forces is zero. What is the magnitude and direction of the second force?
*March 4, 2013*

**physical chemistry**

This question is about a lab called Heats of Ionic Reaction in my Physical Chemistry class. I need to know why there should be a large percentage error in deltaH4
*March 4, 2013*

**math**

27-^(2/3)
*March 2, 2013*

**math**

81-^3/4 cubed of 81-square root of 3 over 4 which is cubed
*March 2, 2013*

**math**

square root of 45 simplfy by factoring
*March 2, 2013*

**math**

a+9b=23 a+2b=2
*February 16, 2013*

**math**

why do i find this confusiong a+8b=11 a+2b=-1
*February 16, 2013*

**math**

find the ordered pair of a+8b=9 a+3b=-1
*February 16, 2013*

**chemistry**

help please, have no clue how to solve this. (a) you are given a mixture containing two compounds, A and B. both compounds have a solubility of 1g/100mL of solvent at 20 deg C and 16g/100mL of solvent at 100 deg C. The sample is composed of 3.5 g of A and 10 g of B. at 100 deg...
*February 11, 2013*

**Math precal**

Show that ab= 1/2 [(a+b)^2 - (a^2+b^2)] Show how's its done i want to learn thank u
*January 10, 2013*

**geometry**

a tree grew at a 3 degree slant from the vertical. at a point 60 feet from the tree, the angle of elevation to the top of the tree is 14 degrees. find the height of the tree to the nearest tenth of a foot.
*December 11, 2012*

**geometry**

an A-frame house is 45 feet high and 32 feet wide. find the measure of the angle that the roof makes with the floor. Round to the nearest degree.
*December 11, 2012*

**Geometry**

A 38 foot tree casts a 16 foot shadow what is the angle of elavation of the sun to the nearest degree?
*December 11, 2012*

**Physics**

A truck is moving 40 m/s when it encounters a ramp inclined by 30% above the horizontal. Gravel provides a frictional force to slow the truck and has a coefficient of friction(.5). How far along the ramp would the truck travel before coming to a stop?
*December 9, 2012*

**calculus**

a lighthouse is 1 km from the shoreline and revolves at 10 pi radians a minute what is the speed of the light as it sweeps across the shore as it lights up at sand at 2 km from the light house
*December 6, 2012*

**Chemistry**

How much heat, in Kj, is required to melt 11.0g of ice, at -13.0 degrees C, and vaporize the H20, and rise the temperature of the steam to 114 degrees C. Need help. Anyone, please!
*November 19, 2012*

**PHYSICS HELP!**

A typical propeller of a turbine used to generate electricity from the wind consists of three blades as in the figure below. Each blade has a length of L = 33 m and a mass of m = 415 kg. The propeller rotates at the rate of 21 rev/min. 120degree angle between blades a) Convert...
*October 31, 2012*

**Calculus**

A farmer has 120 meters of wire fencing to make enclosures for his pigs and cows. The rectangular enclosure he is considering will have one side up against a barn (in the center of one side that is 150 meters long, so the enclosure won't require fencing along that edge) ...
*October 30, 2012*

**College Chemistry**

Two moles of Mg and five moles of O2 are placed in a reaction vessel, and then the Mg is ignited to produce Mg (F.W.= 40.31 g/mole). What is the actual mole ratio, the calculated mole ratio, how many moles of MgO are formed, and what is the weight of MgO formed?
*October 21, 2012*

**Chemistry**

The solution CrCl3 is not colored. What does this suggest about its electron configuration?
*October 13, 2012*

**Math**

128=x+16 128= number of total students. X= the number of boys so, 16+X because there are 16 more girls than boys... so subract 16 from 128 which equals 112 so the number of boys is 112 and the number of girls is 112+16
*October 13, 2012*

**Literature**

How was Opheila mistreated by male characters in Hamlet.
*October 13, 2012*

**math**

Jon begins jogging at a steady 3m/sec down the middle of lane one of a public track. Laura starts even with him in the center of lane two but moves 4m/sec. At the instant they begin, Ellie is located 100 meters down he track in lane four, and is heading towards them in his ...
*October 2, 2012*

**Chemistry**

can u explain that a little more because i still dont understand
*September 23, 2012*

**Chemistry**

The density of dry air measured at 25 degrees Celsius is 1.19x10 to the negative 3rd power. What is the volume of 50.0g of air?
*September 23, 2012*

**Spanish check**

number 5 should be estudio, but other than that the rest of them look correct.
*September 23, 2012*

**AP chemistry**

3.
*September 22, 2012*

**music**

why college students learn about music that is not their favorite type
*September 20, 2012*

**physics**

The record for a marathon is 4 h, 36 min, 21 s. The marathon distance is 90.25 km. Determine the average speed in m/s of a runner achieving this record.
*September 16, 2012*

**physics**

A car is traveling 15 m/s when the driver sees a child standing on the road. He takes 0.8 s to react, then steps on the brakes and slows at 8.0 m/s2. How far does the car go before it stops?
*September 16, 2012*

**physics**

Which has the greater acceleration, a car that increases its speed from 50 to 62 km/h, or a bike that goes from 0 to 12 km/h in the same time?
*September 16, 2012*

**physics**

A bus is moving at 30 m/s when the driver steps on the brakes and brings the bus to a stop in 2.6 s. What is the average acceleration of the bus while braking?
*September 16, 2012*

**Physics**

Determine the final velocity of a proton that has an initial velocity of 2.15x10^5 m/s, and then is accelerated uniformly in an electric field at the rate of -1.10x10^12 m/s2 for 1.20x10^-7 s.
*September 13, 2012*

**Physics**

A car slows from 17 m/s to 2.0 m/s at a constant rate of 2.1 m/s2. How many seconds are required before the car is traveling at 2.0 m/s?
*September 13, 2012*

**geometry**

Find angle A if angle A is supplementary to angle B, angle B is supplementary to angle C, angle B equals 12x plus 8, and angle C equals 8x minus 8
*September 10, 2012*

**Chemistry**

For another picnic you want to make hamburgers with pickles, again without having any left over. You need to balance the number of packages of buns (which usually contain 8 buns) with the number of packages of hamburger patties (which usually contain 12 patties) and the number...
*September 8, 2012*

**Geometry**

In the triangle ABC, the measure of angle A=(5x+3)degrees, the measure of angle B=(8x-2)degrees, and the measure of angle C=(5x-1) degrees. Find the measure of each angle.
*September 7, 2012*

**biology**

SI units
*August 12, 2012*

**algebra**

Use the distributive property to simplify the expression. -11(10+6)
*July 30, 2012*

**Biochemistry**

In naming polypeptides, if asparagine is the second peptide from the N terminal, would it be named asparagyl? Would aspartate be aspartyl if it is the second peptide from the N terminal of a polypeptide?
*July 25, 2012*

**algebra**

s=0 cost =$25 s=1 cost=$41 s=2 cost =$57 s=3 cost=$73 Let s stand for sets of prints ordered. write the RULE that describes a student's total cost.
*July 1, 2012*

**Algebra**

Which symbol correctly compares these fractions? 13 7 ___ __ 20 10 __
*June 27, 2012*

**child care management**

According to leeds,at snack time,children sould be given _ of each food foreach yea of theie lives.
*June 15, 2012*

**Statistics **

A stoplight at the corner of Lincolnway and Duff Avenue is red 20% of the time. For someone who drives through this stoplight 10 times a week, what is the probability that they will stop at least three times?
*June 12, 2012*

**Functions - more info**

Sorry, I forgot to enter all the info before. Below is the updated info for the problem. What's the best way to solve functions? I can do basic ones, but have trouble with the harder ones. I'm having trouble with the following: Inputs x 1, 2, 3, 4, 5 Outputs y 0, 2, 6...
*May 22, 2012*

**Functions**

What's the best way to solve functions? I can do basic ones, but have trouble with the harder ones. I'm having trouble with the following: Inputs x 1, 2, 3, ? Outputs y 0, 2, 6, ? I have tried everything and can't come up with the equation. Please help! Also, if ...
*May 22, 2012*

**math**

Explain how you can find 3/8% of $800? Not sure how to write it out, I know the answer is 3.
*May 7, 2012*

**math**

there are 20pages in jamel book he read 1/5 of the book how many pages did he read?
*May 6, 2012*

**Chemistry**

Na₂CO₃ (s) + 2HCL (ag) → 2NaCl (ag) + CO₂ + H₂O (l) If 4.25g of sodium carbonate is reacted completely with excess hydrochloric acid as 3M HCl, how many mL of HCl would be consumed? Note: Assume 3M HCl contains 3.00 moles of HCl per liter of ...
*April 30, 2012*

**Chemistry**

Thank you very much.
*April 24, 2012*

**Chemistry**

Maleic acid is a carbon-hydrogen-oxygen compound used in dyeing and finishing fabrics and as a preservative of oils and fats. * In a combustion analysis, a 1.054-\rm g sample of maleic acid yields 1.599 \rm g of \rm CO_2 and 0.327 \rm g of \rm H_2O. * When 0.609 \rm g of ...
*April 24, 2012*

**Math**

enrollment in a business seminar increased from 75 to 85 people. what is the persent increase
*April 18, 2012*

**Math**

1752
*April 15, 2012*

**Ethics Applied**

I have to watch a movie of my choice and then write a paper consisting of 4-5 paragraphs about 2 characters and a major moral issue they each face and then identify the moral approach (egoism, religious ethics, and contractarianism) each uses to resolve the issue. I need help ...
*March 1, 2012*

**math**

. In the annual walkathon, Lee jogs for 5 3/4 miles more than he walks. If he travelled a total of 15 miles, how many miles did he walk?
*February 24, 2012*

**physics**

A 6kg cat is running across a table which is 1.2 m tall. The kinetic energy of the cat is 48 j. A) how fast is the cat running? B) what is the potential energy of the cat? C) what is the total mechanical energy of the cat?
*February 20, 2012*

**physics**

A 6kg cat is running across a table which is 1.2 m tall. The kinetic energy of the cat is 48 j. A) how fast is the cat running? B) what is the potential energy of the cat? C) what is the total mechanical energy of the cat?
*February 20, 2012*

**physics**

A ball is thrown upward at a speed v0 at an angle of 52.0˚ above the horizontal. It reaches a maximum height of 7.3 m. How high would this ball go if it were thrown straight upward at speed v0?
*February 19, 2012*

**physics**

A 2490 kg demolition ball swings at the end of a 35.9 m cable on the arc of a vertical circle. At the lowest point of the swing, the ball is moving at a speed of 7.26 m/s. Determine the tension in the cable.
*February 19, 2012*

**physics**

Boat A negotiates a curve whose radius is 336 m. Boat B negotiates a curve whose radius is 160 m. Each boat experiences the same centripetal acceleration. What is the ratio of the speed of boat A to that of boat B?
*February 19, 2012*

**Physics**

A jet flying at 120 m/s banks to make a horizontal circular turn. The radius of the turn is 3810 m, and the mass of the jet is 2.19 × 105 kg. Calculate the magnitude of the necessary lifting force. L =____ N
*February 19, 2012*