# shane

Most popular questions and responses by shane-
## chem

Consider the fermentation reaction of glucose: C6H12O6 ----) 2C2H5OH+2CO2 A 1.00-mol sample of C6H12O6 was placed in a vat with excess yeast. If 35.1 g of C2H5OH was obtained, what was the percent yield of C2H5OH?

*asked on March 14, 2013* -
## Math Word Problem

Ron is tiling a countertop. He needs to place 54 square tiles in each of 8 rows to cover the counter. He wants to randomly place 8 groups of four blue tiles each and have the rest of the tiles in white. How many white tiles will Ron need?

*asked on November 16, 2012* -
## CHEM

A 0.4647-g sample of a compound known to contain only carbon, hydrogen, and oxygen was burned in oxygen to yield 0.8635 g of CO2 and 0.1767 g of H2O. What is the empirical formula of the compound? i got C3H3O2 IS IT RIGHT?

*asked on March 14, 2013* -
## math

In a bag there are 3 green apples,5 yellow apples,7 green pears and 2 yellow pears,Simon randomly is taking fruit out of the bag by one by one. How many fruits must he take out in order to be certain that he has at least one apple and one pear of the same

*asked on February 5, 2017* -
## Science

Explain why it is necessary for phloem to be alive to be functional,whereas xylem can function as dead tissue:

*asked on March 6, 2013* -
## physics

A softball of mass 0.220 kg that is moving with a speed of 6.5 m/s (in the positive direction) collides head-on and elastically with another ball initially at rest. Afterward it is found that the incoming ball has bounced backward with a speed of 4.8 m/s.

*asked on December 9, 2009* -
## 7th math

I have no more than five books in my bag. I need to write an inequality for this, x

*asked on May 16, 2013* -
## MATHS - URGENT

Write the expression in terms of sine only. 8(sin 2x − cos 2x)

*asked on May 21, 2013* -
## chemistry

For the electrolysis of molten potassium bromide: (a) write the equation for the reaction at cathode. (b) write the equation for the reaction at anode. (c) write the equation for the overall reaction.

*asked on September 10, 2014* -
## chemistry

For the electrolysis of molten potassium bromide: Write the equation for the overall reaction.

*asked on September 7, 2014* -
## Pre-Calculus

a ferris wheel is elevated 1 meter above ground. When car reaches the highest point of the Ferris wheel, it's altitude from ground level is 31 metres. How far away from the center, horizontally, is the car when it is at an altitude of 25 meters?

*asked on June 8, 2017* -
## Science

COMPOUND 1 CH2=CH-CH-OH ________| _______CH3 COMPOUND 2 _____________O ____________// CH3-CH-CH2-C _____|______\ ____CH3______OH *Now, I must: Identify any functional groups in these compounds and name them. The functional group in 1 is the OH which makes

*asked on February 7, 2007* -
## physics

A 2.40 kg mess kit sliding on a frictionless surface explodes into two 1.20 kg parts: 3.78 m/s, due north, and 5.28 m/s, 32.8° north of east. What is the original speed of the mess kit?

*asked on March 11, 2015* -
## science

Represent this reaction with balanced chemical equation. Disilane gas (Si2H6) undergoes combustion to form solid silicon dioxide and water.

*asked on November 23, 2012* -
## Cruz

A ferris wheel is elevated 1 meter above ground. When car reaches the highest point of the ferris wheel it's altitude from ground level is 31 meters. How far away from the center,horizontally, is the car it is at an altitude of 25 meters?

*asked on June 8, 2017* -
## math

Your favorite breakfast cereal contains a toy dinosaur in each box. There are four different dinosaur toys in the complete collection, and each one has an equal chance of being in each box. You want to figure out what the probability is that you will get

*asked on May 16, 2013* -
## Calculus

Estimate the area under the curve f(x) = x2 + 1 from x = 0 to x = 6 by using three circumscribed (over the curve) rectangles. Answer to the nearest integer.

*asked on March 15, 2016* -
## statistics

A music industry researcher wants to estimate, with a 90% confidence level, the proportion of young urban people (ages 21 to 35 years) who go to at least 3 concerts a year. Previous studies show that 21% of those people (21 to 35 year olds) interviewed go

*asked on March 19, 2017* -
## Maths

An aeroplane flies due north for 200 km and then turns due east and flies for a further distance of 325km. Find the bearing,to the nearest degree,of the aeroplane from its starting point.

*asked on April 5, 2013* -
## Chemistry

One step of the Ostwald process for manufacturing nitric acid involves making nitrogen monoxide by oxidizing ammonia in the presence of a platinum catalyst: 4NH3 (g) + 502 (g)>> 4NO (g) + 6H2O (g). If the percentage yield is 80.3%, how many grams of NO can

*asked on June 10, 2013* -
## Physics

A window washer pulls herself upward using the bucket-pulley apparatus shown in Fig. 4-42. The mass of the person plus the bucket is 69 kg.How hard must she pull downward to raise herself slowly at constant speed?If she increases this force by 11 percent,

*asked on October 13, 2009* -
## science

The substances listed on the left side of a chemical equation are the _____. A.coefficients B.products C.reactants im sayin a but not sure

*asked on May 17, 2019* -
## math

A florist has 78 white roses and 65 red roses. The florist arranges the roses into groups that have the same ratio of white roses to red roses as the whole collection of roses. How many white roses are in a group that has 10 red roses? Complete the ratio

*asked on February 4, 2019* -
## physics - please help

A 0.455 kg wood block is firmly attached to a very light horizontal spring (k = 160 N/m). It is noted that the block-spring system, when compressed 5.0 cm and released, stretches out 2.3 cm beyond the equilibrium position before stopping and turning back.

*asked on November 23, 2009* -
## chemistry

The volume occupied by the reaction SiF4(g)+2H2O (g)=SiO2 (s)+4HF (g). is reduced.Predict the direction of shift in the position of equilibrium.Will the shift be in the direction of the more gaseous molecules,or fewer?

*asked on March 6, 2013* -
## maths

A parallelogram has two adjacent sides of length 4cm and 6cm reapectively. If the included angle measures 52 degrees, find the area of the parallelogram.

*asked on June 10, 2014* -
## math

divide $ 680.00 among three children with the ratio 2:4:6 please show me how to work out the answer

*asked on October 22, 2009* -
## Chemistry

I'm stumped 4ko2 + 2co2 ----2k2co3 + 3o2 What mass of k02 in grams is required to react with 8.90 l at 22.0 c and 767 mm hg? Please help thank you

*asked on December 15, 2014* -
## Pyhsics

A sled slides down a snow-covered hill at CONSTANT SPEED. If the hill makes an ANGLE of 10degrees ABOVE THE HORIZONTAL, WHAT IS THE COEFFICIENT OF KINETIC FRICTION BETWEEN THE SLED AND THE SNOW? ~>HELP!

*asked on October 19, 2009* -
## maths

ABC is the segment of a circle with center O. This segment is enclosed in a rectangle APQC. Given that AC = 32 cm and AP = 8 cm, calculate; (a) The radius of the circle. (b) The angle AOC in both degrees and radians. (c) The area of the shaded region.

*asked on June 20, 2013* -
## Trig.

Help with this problem please. I don't get it at all. A ship is heading due north at 12 mph. The current is flowing southwest at 4mph. Find the actual bearing and speed of the ship.

*asked on March 30, 2010* -
## chemistry

in HNO3 titration, you add few drops of phenolphthalein indicator to 50.0 mL of acid in a flask. you quickly add 20.00 mL of 0.0547 M NaOH but overshoot the end point, and the solutions turn deep pink. instead of starting over, you add 30.00 mL of acid,

*asked on September 27, 2014* -
## Science

If changing conditions lead to decreased oxygen levels in the stream, the carrying capacity of the stream for the trout will decrease. Oxygen level in water is therefore a(n) _____________ with respect to the number of trout that a particular stream can

*asked on January 7, 2014* -
## Chemistry

Calculate the solubility of the compoud PbI2 in a 0.0333 M solution of Mg(ClO4)2 using (1) activities and (2) molar concentrations

*asked on February 6, 2019* -
## math

You and your friend collect 180 cans for a food drive. The ratio of cans you collected to cans your friend collected is 4 to 5. Use the tape diagram to find how many cans you collected.

*asked on February 4, 2019* -
## accounting

As of January 1 of the current year, the Grackle Company had accounts receivables of $50,000. The sales for January, February, and March of 2012 were as follows: $120,000, $140,000 and $150,000. 20% of each month’s sales are for cash. Of the remaining

*asked on May 3, 2015* -
## Chemistry

Calculate the [H], [OH], pH and the pOH of this solution; 0.0025 M NaOH

*asked on June 19, 2013* -
## Biology

Explain why a plant needs to move food around,particularly from the leaves to other regions:

*asked on March 8, 2013* -
## chemistry

This balance equation shows the burning of octane in air. 2C8H18 + 25O2 ----> 16CO2 + 18H2O. How many grams of carbondioxide will be produced when 1 mole of octane burns completely?

*asked on August 8, 2013* -
## Math algebra

The radiator in a car is filled with a solution of 60% antifreeze and 40% water. The manufacturer of the the antifreeze suggests that, for summer diving, optimal cooling of the engine is obtained with only 50% antifreeze. If the capacity of the radiator is

*asked on November 24, 2015* -
## chemistry

Please I need help. Many,but not all, compounds are made up of positive and negative ions. Three positive ions A^+, B^2+ and C^3+ could form a total of six different compounds with negative ions, Y^2- and Z^3-. Derive the formulae for six compounds and

*asked on August 28, 2014* -
## math

in the auditorium there are 24 rows of seats. the first second rows have 8 chairs and the third and fourth rows have 10 chairs.if this pattern continues.how many chairs are in the auditorium?

*asked on November 17, 2012* -
## physics - PLEASE HELP

A vertical spring (ignore its mass), whose spring constant is 980 N/m, is attached to a table and is compressed 0.160 m. (a) What speed can it give to a 0.400 kg ball when released? (b) How high above its original position (spring compressed) will the ball

*asked on November 24, 2009* -
## maths

Calculate the arc length that subtends an angle of 55 degree at the centre of a circle with radius r = 5cm.

*asked on September 1, 2013* -
## Maths

Ship A is 18.5km from a port P on a beearing of 045 degree and ship B is 26.4km from point P on a bearing of 105 degree. Calculate the bearing of A from B and the distance AB.

*asked on May 6, 2013* -
## Macroeconomics

Durring the late 1970's prices quoted in terms of the Israeli currency, the shekel, rose so fast that the grocery stores listed their prices in terms of the U.S. dollar and provided customers with the dollar-shekel conversion tables that they updated

*asked on October 13, 2010* -
## physics

What is the apparent weight of a lead brick 2.0 in x 2.0 in x 8.0 in if placed in oil with density p=0.93 g/cm^3 (Ppb=11.4 g/cm^3)(1 in. = 2.54 cm)

*asked on January 21, 2013* -
## Science

Does all the water which rises up a plant escape through the leaves?

*asked on March 5, 2013* -
## Physics

A 17 kg child descends a slide 3.5 m high and reaches the bottom with a speed of 1.5 m/s. How much thermal energy due to friction was generated in this process?

*asked on November 16, 2009* -
## physics

An object in equilibrium has three forces exerted on it. A 25 N force acts at 90 from the x-axis and a 48 N force acts at 60. What are the magnitude and direction of the third force

*asked on November 29, 2015* -
## maths

The coefficient of x^2 is 69 in the expansion of (1-ax)^24, where a>0. Find the coefficient of x^3.

*asked on August 8, 2013* -
## Maths

A surveyor measures the angle of elevation of the top of the mountain from a point (P) at sea level as 30 detre along a track which slopes uniformly uphill towards the mountain. From this point, which is 50 metre above sea level, he measures the angle of

*asked on June 20, 2013* -
## geo

a carpenter cut the top section of window frame with a 32 degree angle on each end. The side peices hav an angle of 49 degreese at the top will the side pieces be parallel

*asked on December 1, 2011* -
## Probabilities (Math)

An experiment consists of tossing a coin 14 times. (a) How many different outcomes are possible? (b) How many different outcomes have exactly 9 heads? (c) How many different outcomes have at least 2 heads? (d) How many different outcomes have at most 10

*asked on March 22, 2010* -
## math

2005 2006 2007 2008 Plant 1 20 4 25 10 Plant 2 25 5 5 48 Plant 3 20 8 20 32 Plant 4 43 10 10 47 Plant 5 40 11 15 48 A gardener recorded how many tomatoes 5 plants produced each year. Which year had the LARGEST interquartile range of tomatoes produced? A)

*asked on May 16, 2013* -
## algebra

Six people are going to be seated in a row of 8 chairs. How many different ways may they be seated?

*asked on December 14, 2010* -
## math

Which figure in the pattern below will have 99 squares? Figure 1 (picture of 1 square) Figure 2 (picture of 3 squares) Figure 3 (picture of 5 squares)

*asked on October 11, 2010* -
## Algebra

A rectangle has dimensions in feet as shown in the figure it is 2x +5 And one side is 8. I need to write an expression for the area of the rectangle. B. Find the area of the rectangle, in sq.ft. if x=3 C. Find the value of x if the area of the rectangle is

*asked on October 3, 2016* -
## science

Explain what is meant by source to sink flow in phloem transport.

*asked on March 6, 2013* -
## maths

A lighthouse is 9.6 nautical miles from a ship which bears 156 degrees from the lighthouse.How far is the ship east of the lighthouse?Give answer correct to one-tenth of a nautical mile.

*asked on March 3, 2013* -
## Math

Two cars leave the same town and travel in opposite directions. At the end of 8 hours, the cars are 896 miles apart. Find the rate of each car if the rate of one car is 4 mi/hr more than the rate of the other.

*asked on November 24, 2015* -
## Maths

ABC is the segment of a circle with center O. This segment is enclosed in a rectangle APQC. Given that AC=32cm and AP = 8 cm, calculate; (a) The radius of the circle. (b) The angle of AOC in both degrees and radians (c) The area of the shaded region.

*asked on June 18, 2013* -
## Biology

Mature phloem is a live tissue,whereas xylem is dead when mature.Explain why it is necessary for phloem to be alive to be functional,whereas xylem can function as dead tissue:

*asked on March 8, 2013* -
## Maths

The diagonals of a rhombus are 320mm and 240mm in length.Find the angles of the rhombus.

*asked on March 3, 2013* -
## Physics

The mass of a certain planet is six times the mass of the earth and the diameter of the planet is twice the diameter of the earth. Find the acceleration od gravity on the surface of this planet. HELP ME SOLVE! THANKS!

*asked on October 15, 2009* -
## Math

An Ostrich can run 174 feet in 3 seconds. it costs $ 6:30 to mail a 6- pound package.

*asked on October 19, 2008* -
## government

We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness. — That to secure these rights, Governments

*asked on August 18, 2016* -
## History

What is one certain long-term cost of adding to national debt? a.) Americans in the future must have fewer public services b.) Americans in the future will not vote in elections c.) Americans in the future will not enjoy the benefits of the program d.)

*asked on April 30, 2015* -
## chemistry

Write the anodic reaction for the electrolysis of concentrated zinc chloride solution. (a) Using plantium electrodes. (b) Using zinc electrodes

*asked on September 6, 2014* -
## math

a recipe calls for 2 and 3/4 cups of milk. how many cups of milk written as a fraction greater than one are used in the recipe?

*asked on March 6, 2014* -
## science

Describe one benefit of the transpiration stream of a plant:

*asked on March 7, 2013* -
## maths

The vertical angle of a cone is 110 degree and the diametre of its base is 186mm.What is its height?

*asked on March 3, 2013* -
## maths

A chord subtends an angle of 68 degree at the centre of a circle of radius 200 mm.Find the length of the chord.

*asked on March 3, 2013* -
## Algebra

how many cubic feet are in the volume of a round swimming pool which is 16 feet in diameter and 4 feet deep throughout?Express your answer in terms of pi.

*asked on December 14, 2010* -
## chemistry

How many grams are there in 2.5 moles of CuSO4.5H2O?

*asked on August 11, 2014* -
## maths

Expand (1+2x)^20 - (1-2x)^20) in ascending powers of x up to the term in x^5 and use this result to evaluate (1.02)^20 - (0.98)^20 to 3 significant figures.

*asked on August 6, 2013* -
## HELP Physics

The average rate at which energy is conducted outward through the ground surface in a certain region is 30.9 mW/m2, and the average thermal conductivity of the near-surface rocks is 3.11 W/m·K. Assuming a surface temperature of 9.48°C, find the

*asked on April 12, 2013* -
## maths

Using the complementary angle ratio results,find the value of x for the following. (a) cos(x+35)degree=sin x degree (b) sec x degree=cosec(x+20)degree

*asked on April 5, 2013* -
## maths

Two walkers set off at the same time from a crossroad and walk along flat straight roads inclined to each other at 68 degrees.If they both walk at a speed of 6km/h,find their distance apart 10 minutes later.

*asked on March 10, 2013* -
## chemistry

If the temperature of the system PCl5 (g) =PCl3 (s) + Cl2 (g) + 92.5 kj. is increased, predict the direction of th Le Chatelier's shift.

*asked on March 6, 2013* -
## algebra

Two runners jog around an oval path at constant rates, but in opposite directions. One runner completes a lap every 10 minutes, and the other does a lap every 12 minutes. How many minutes lapse between consecutive meetings of the runners? Express your

*asked on December 14, 2010* -
## Math

Frank teacher was teaching the class about fractions. She posted the fractions 1/7 and 3/9 on the board. Frank was supposed to answer what the least common multiple of the two fractions was. What did he answer? Help

*asked on January 21, 2015* -
## maths

A ship sailing on a course bearing 036 degrees is 5500 metres due south of a lighthouse.If the ship continues on this course,what is the closest distance the ship will come to the lighthouse?

*asked on March 8, 2013* -
## maths

Two patrol boats M3 and M7 leave port at the same time.M3 heads due west and M7 on a bearing 227 degrees.After 30 minutes M7 has travelled 18 nautical miles and observes M3 in a direction due south.(a)How far is M3 from M7? (b) How far has M3 travelled?

*asked on March 8, 2013* -
## maths

A light air craft takes off flying die north then turns and flies 11 000 metres due west.The plane then has a bearing of 340 degrees from its starting point.For what distance did it fly due north?

*asked on March 6, 2013* -
## maths

The angle between two tangents from a point to a circle is 82 degree.What is the length of one of these tangents if the radius of the circle is 80mm?

*asked on March 3, 2013* -
## alebra

the sum of twice a number and 4 less than the number is tha same as the diiference between -36 and the number. What is the number?

*asked on February 15, 2013* -
## chemistry

Represent this reaction with a balance chemical equation. Solid aluminium hydride is formed by a combination reaction of its two elements.

*asked on November 25, 2012* -
## Science

A solution of silver nitrate is mixed with a solution of potassium sulphide.Write the molecular,total ionic,and net ionic equations illustrating the reaction.

*asked on November 23, 2012* -
## AP Physics C

A stone is catapulted at time t = 0, with an initial velocity of magnitude 21.5 m/s and at an angle of 35.3° above the horizontal. What are the magnitudes of the (a) horizontal and (b) vertical components of its displacement from the catapult site at t =

*asked on September 17, 2012* -
## Math

I have a series of questions that I did. They lead up to the last question I can't solve. Could you check my math and help me with the last question? Thanks! a) Let a be the point (2,3). Compute the distance from Origin 0 to A answer: a^2 + b^2 = c^2 3^2 +

*asked on October 14, 2010* -
## algebra

I have a few problems I need you to take a look at and tell me if I arrived at the right answer. 1. I am to use the intercepts to graph the equation x+3y=6 I used the formula y=mx+b using 3 and -6 for x I got these as my ordered pairs to graph (3, 1), (-6,

*asked on January 7, 2010* -
## Algebra

I have a few problems I need you to take a look at and tell me if I arrived at the right answer. 1. I am to use the intercepts to graph the equation x+3y=6 I used the formula y=mx+b using 3 and -6 for x I got these as my ordered pairs to graph (3, 1), (-6,

*asked on January 6, 2010* -
## 6th Grade Math

I just need some direction to get started please.... Some family friends have asked you to plan a rafting expedition. A rafting has given you specific details on how much weight a raft can hold. A raft can safely carry the weight of 24 babies. The weight

*asked on February 3, 2009* -
## algebra

Last year, Hans deposited $3000 into an account that paid 5% interest per year and $7000 into an account that paid 4% interest per year. No withdrawals were made from the accounts

*asked on February 24, 2018* -
## History!!!

What does this poll most suggest about U.S. citizens? a.) they belive that higher taxes are worth the cost and benefits b.) they think that most government programs have little value c.) they prefer fewer public goods and services over higher personal

*asked on April 30, 2015* -
## science

What is the mass of air in a room meauring 30 cubic meters if the density of air is 1.3kg per cubic meter?

*asked on March 15, 2015* -
## chemistry

A small quantity of hydrochloric acid and a large quantity of limestone chips (CaCO3) are reacted on a beaker, which was placed on the pan of a balance. The mass of the beaker and its contents were recorded every half minute. (a) Write a chemical equation

*asked on September 16, 2014* -
## maths

The relationship between the vertical height and the horizontal distance of a ball thrown at 45 degree is given by the equation y = x - x^2/50, where y is the vertical height and x is the horizontal distance. (a) Find the maximum vertical height reached.

*asked on September 1, 2013* -
## Maths

Using the exact trigonometric ratios of 45 degree,30 degree and 60 degree,evaluate the following,leaving where necessary your answer in surd form. (a) 3 sin 30 degree-2 cos 60 degree (b)(tan 45 degree)(4 cos 60 degree-2 cos 60 degree)

*asked on April 5, 2013*