# Shane

Popular questions and responses by Shane-
## 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* -
## 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* -
## 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* -
## MATHS - URGENT

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

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

Write 1/2^1-n in non- fractional form.

*asked on May 19, 2014* -
## Biology

What are some of the treatments for coronary artery disease?

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

Explain the role of white blood cells in the body's defense against foreign substances.

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

The difference between twice a number and a number that is 5 more than 3. Write an equation that could be used to find the value of the number n, and explain how you arrived at.at your choice

*asked on October 16, 2016* -
## 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* -
## Math

Prove the identity: sec^4x - tan^4x = 1+2tan^2x

*asked on November 10, 2014* -
## maths

From an observer 0, the angles of elevation to the bottom and top of the flag pole are 36 degree and 38 degree respectively. The base is 200m. Find the height of the flag pole.

*asked on April 5, 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* -
## 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* -
## business communication

you are in a group that feels very cohesive, so cohesive that it seems to agree readily at every step of a project, without any lengthy discussion or conflict. sometimes you don't agree with decisions, but you do not say anything. which of the following is

*asked on April 20, 2011* -
## 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* -
## Chemistry

0.2 Faradays of electricity were passed through solutions of sulphuric acid. Calculate the volume of hydrogen evolved at s.t.p in sulphuric acid.

*asked on August 24, 2013* -
## math

tan(180-x)sin(360-x)cos90-x)cos(-x)/sin(x-180)cos(450+x)tan(180-x)

*asked on May 19, 2013* -
## Chemistry

(1) Use the thermodynamic values to (a) deduce the enthalpy change of each reaction (b)state if the reaction is exothermic,or endothermic,and also how much energy is released or absorbed. For thi reactions; (1) NH4NO3 (s)------>N2 (g) + 2H2O (l) (2) 4Zn

*asked on March 12, 2013* -
## 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* -
## 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* -
## 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* -
## 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* -
## basic electronics

3 resistor in parallel have an equivalent resistance of 1000 ohms. If R2 is twice the value of R3 and trice the value of R1, what is the value of R1,R2 and R3? Please show me the sol'n. n_n

*asked on June 14, 2015* -
## 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* -
## 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* -
## maths

Find the coordinates of the points of intersection of the straight line y = 3x - 6 with the parabola y = x^2 - 6x + 8 and solve Graphically.

*asked on May 12, 2014* -
## maths

Given the quadratic equation y = -x^2 + 2x + 3. a) Will the graph turn upwards or downwards? b) What are the coordinates of x and y intercepts? c) What is the coordinate of the turning point? d) Use your answer in parts (a,b,c and d) to sketch the graph.

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

One pump can empty a pool in 5 days, whereas a second pump can empty the pool in 7 days. How long will it take two pumps, working together, to empty the pool?

*asked on November 18, 2013* -
## 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

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* -
## Maths

Find all the values of theta between 0 degree and 360 degree, and state the quadrants in which they exist. (a)cos theta=-0.71 (b)tan theta=1.732

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

An observer on top of a building 66 metres high,finds the angle of elevation to the top of a taller building to be 34 degrees.The angle of depression to the foot of the same building is 51 degrees.If the buildings are on the same ground level find the

*asked on March 13, 2013* -
## Biology

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

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

Name three environmental conditions that increases the rate of transpiration in plants,explaining how they operate:

*asked on March 6, 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* -
## Science

Which of the following represents a decimal system of measurement? 1 quart = 16 fluid ounces 1 mile = 5,280 feet 1 kilometer = 1,000 meters 1 pound = 16 ounces

*asked on October 17, 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* -
## 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* -
## 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* -
## 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* -
## science

what material can we use as an indicator of acid?in other words,what material can we use to test a food to see if acid is present? what is the relationship between the concentration of acid in a liquid and the amount of carbon dioxide produced?

*asked on October 15, 2008* -
## 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* -
## Math

Which of the following

*asked on December 4, 2019* -
## calculus

A)A lighthouse emits a beam of light that rotates (counterclockwise from a birds-eye perspective) at a constant rate with one full rotation every 10 seconds. 100 feet east of the lighthouse is a long wall running north-south. How fast is the light’s

*asked on October 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* -
## 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* -
## Calculus

Suppose the population of a colony of ants grows at the rate: P’(x) = 1 + 5/sqroot(t+1) If there are 250 ants after 120 hours, what was the population at t=0?

*asked on April 1, 2018* -
## Calculus

Suppose the annual revenue for a company between 2000 and 2005 is approximated by R(t)=18t^2+4t+3, where t=0 represents the year 2000.(a)Find the Average Value of R(t) between t=1and t=6. (b)Find the Average Rate of Change of R(t) between t=1 and t=6.

*asked on April 1, 2018* -
## 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* -
## math and social networking

what could I use 39000 KB worth of data on in about six minutes of time on my s7 edge cell phone

*asked on September 24, 2017* -
## Math

Ethel collects animal stickers.She has 30 cat stickers,15 horse stickers,19 dog stickers and 11 rabbit stickers. One third of the horse stickers are round and the rest are square. One fifth of the cat stickers are square and the rest are round. All the dog

*asked on July 27, 2017* -
## 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* -
## 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* -
## English

What are two themes in Perseus Adventures? Reading the book but really don't understand the question

*asked on November 2, 2016* -
## Algebra

The sum of 3 consecutive odd numbers is 63. What is the smallest of these numbers

*asked on October 19, 2016* -
## Global History

Describe in 7 sentences the significant of each individual. 1. Aryans 2. Asoka 3. Brahmins 4. Confucius 5. Laozi 6. Shi Huangdi 7. Siddhartha Guatama 8. Untouchables 9. Wudi I believe the were all famous rulers but that is all I know

*asked on October 19, 2016* -
## Health

Identify and define the causes of mental disorders

*asked on October 10, 2016* -
## 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* -
## Math

An object with initial velocity of 20 m/s accelerates uniformly at 5 m/s in the direction of its motion for a distance of 10 m. What is the final velocity of the object?

*asked on September 27, 2016* -
## Physics

A piece of cobalt has a mass of 41 g and is initially electrically neutral. It is then charged with q = +0.6 µC. (a) How many electrons were removed from the piece of cobalt in the charging process (in electron) (b) What fraction of the total number of

*asked on January 18, 2016* -
## Physics

Determine the magnitude of the force between an electric dipole with a dipole moment of 2 ✕ 10-29 C m and an electron. The electron is positioned r = 25nm from the centre of the dipole, along the dipole axis. Hint: Assume that r >> d, with d the charge

*asked on January 18, 2016* -
## 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* -
## 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* -
## Math

There are two fractions that are given. The two fractions are 3/12 and 7/12.what answer so you come up with if you were to add these two fractions together? Would my answer be 10/12.

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

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

*asked on September 7, 2014* -
## 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* -
## maths

John wishes to determine the height of a flagpole. He takes a sighting of the top of the flagpole from point P. He then moves further away from the flagpole by 20 metres to point Q and takes a second sighting. Given the angle Q is 28 degrees and angle P is

*asked on June 7, 2014* -
## maths

An aircraft dropped a box of emergency supplies to a group of trampers. The height of the box above the ground, h, at time, t is given by the formula; h = 520 - 5t^2, where h is in metres and t is in seconds. Find how long it takes for the box to fall to

*asked on May 26, 2014* -
## maths

Solve this equation by completing squares and then check the solution.. x = 21/x-4

*asked on May 20, 2014* -
## maths

a)Express y = 2 (x - 1) (x - 5) in the form y = ax^2 + bx + c. b) From the above quadratic equation calculate the following: I) x and y intercepts II) Coordinate of the turning point III) Is the graph a maximum or minimum turning point?

*asked on May 20, 2014* -
## maths

2/ x^2 - 9xy^2 - 3/3x + 12y

*asked on May 6, 2014* -
## maths

Simplify; x^2 - x - 6/ 6xy divide x^2 - 9/2x^2y

*asked on May 6, 2014* -
## maths

Simplify; p^2 - p - 42

*asked on May 6, 2014* -
## maths

Find the coordinates of the points of intersection of the straight line y = 3x - 6 with the parabola y = x^2 - 6x + 8. a) Graphically b)Prove your answer in (a) algebraically

*asked on May 2, 2014* -
## algebra

How do you factor 2a^2+5x+3

*asked on April 20, 2014* -
## maths

Write the equations below in the form y = mx + c. State how many solutions each systems of linear equation have. 3x = 6y 2y - 6x + 2 = 0

*asked on April 19, 2014* -
## naths

What is the equation of the line which has gradient 2, and passes through midpoint of (3,4) and (5,6)

*asked on April 19, 2014* -
## maths

Show by calculations weather the following lines are parallel or not.. y + 5x = 1 and 0.2 = y - 5.

*asked on April 16, 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* -
## maths

Does the parabola y = -3x^2 + 2x - 1 have a maximum or minimum value?

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

Find the line that is perpendicular to y = -3/4 x + 2 and passes through (3,4).

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

Find the two stationary points on the curve when y = 2x/x^2 + 1

*asked on September 1, 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* -
## maths

Expand (1-x)^4. Hence find S if S = (1-x^3)^4 - 4(1-x^3)^3 + 6 (1-x^3)^2 - 4(1-x^3) + 1.

*asked on August 6, 2013* -
## 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* -
## Maths

Given the f (x) =2x^3 + ax^2 + bx - 9. (a)Find the value of a and b if f (x) has a factor x -3 but leaves a reminder of 8 when divided by x + 1. (b) Factorize f (x) completely and hence solve for x.

*asked on June 17, 2013* -
## maths

Find two geometric progression having: 2 as second term and 1458 as eight term,

*asked on June 15, 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* -
## 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* -
## 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* -
## maths

Please I need help.Show full working out. (a) sin x cot x= cos x (b) (1 + tan theta)^2 + (1- tan theta)^2 = 2sec^2theta

*asked on May 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*