Friday

April 18, 2014

April 18, 2014

Total # Posts: 296

**Chemistry**

oh nvmd yes the LR is O2

**chem**

COULD YOU PLS EXPLAIN IT TO ME.

**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?

**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 height of the taller buil...

**maths**

Find the area of an equilateral triangle whose base is 10 cm.

**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 (s) + 9HNO3 (aq)----...

**Maths**

From a point on a lighthouse 76 metres above sea level,the angle of depression of a fishing boat 28 degrees.How far is the boat from the foot of the lighthouse?

**maths**

A surveyor finds two points A and B on a hillside to be 114.6 metres apart(measured along the line of sight) and finds the angle of elevation from A to B to be 21 degrees.On his plans these points must be shown at their horizontal distance apart.Find this distance.

**Maths**

The top of a T .V .tower casts a shadow 35 metres long when the angle of elevation of the sun 57 degree40 minutes.How high is the top of the tower?

**maths**

From an aircraft flying at 8000 metres above sea level the angle of depression of a ship is 36 degree15 minutes.How far is the ship from the plane in a straight line?

**maths**

A tourist viewing Sydney Harbour from a building 180 metres above sea level observes a ferry which is 850 metres from the base of the building.Find the angle of depression of his line of sight.

**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.

**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.

**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.

**Biology**

Describe one benefit of the transpiration stream of a plant:

**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?

**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:

**Biology**

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

**Biology**

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

**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?

**maths**

A ship sails on a steady course bearing 106 degrees from A to B.If B is 76 nautical miles further east than A,find,to the nearest nautical mile,how far the ship has sailed?

**maths**

Thankyou

**maths**

After walking due west,turning and walking due south a man is 900 metres from his starting point and bearing 205 degrees from it.How far did he walk(a) westward?(b)southward?

**science**

Describe one benefit of the transpiration stream of a plant:

**Science**

Describe two features of internal anatomy that distinguish monocot and dicot roots.

**Maths**

In angle ABC,angle A=angle B=32degree and AB=108 mm,find the perpendicular height from C to the baseAB.

**science**

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

**Science**

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

**science**

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

**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?

**chemistry**

The system H2 (g) + 3N2 (g) = NH3 (s) is at equilibrium.Use Le Chatelier's principle to predict the direction in which the equilibrium will shift if the ammonia is withdrawn from the reaction chamber.

**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.

**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?

**science**

Describe two differences between xylem and phloem.

**science**

What happens if water is lost from the leaves faster that it is taken up the roots?

**Science**

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

**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.

**maths**

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

**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.

**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?

**maths**

A rectangle has sides 170mm and 130mm.What is the angle between the diagonals?

**Maths**

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

**Maths**

If cos A=3/5 and A is acute,find sin A,tan A,and sec A.

**Science**

Invent a unit to measure how fast you spend your money

**Science**

List the types of energy according to the: (a)content/particle arrangement (b)energy changes involved

**Science**

what is the unit for measuring the speed at which a motor spins?

**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?

**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)

**Physics**

Why does the volume of air bubble increase as it rises toward the surface?

**math**

For the party, 105 re and blue balloons were inflated. There were 3 red balloons for every 2 blue balloons. How many blue balloons are there?

**statistics**

An organization sends a random sample of surveys to 100,000 people and received 4,781 responses. A) Give a 95% confidence interval for the true proportion of those from their entire mailing list who may donate.

**chemistry**

What is the molarity of a sulfuric acid solution if 30.00mL of H2SO4 is required to neutralize 0.840g of sodium hydrogen carbonate? H2SO4(aq) + NaHCO3(aq) → Na2SO4(aq) + H2O(l)+ CO 2(aq)

**biology**

Why is fermentation an important process for some organisms?

**Physics**

Two resistors of equal resistance are connected in series with each other and are connected to a battery that produces a potential difference of 8 V. If the current is 0.2 A what is the value of each resistance?

**Maths**

State the x-intercepts of the graph of y=1-x^2

**Maths**

Point P(-8,-3)and Q(6,9)are joined by a straight line.Find the equation of the line joining the midpoint of PQ to the origin.

**Maths**

Solve for x,leave your answer in surd form. 2/x+2 + 3/x+1=5

**Maths**

Given the quadratic function y =3x^2+10x-8 (i)Find the y-intercept. (ii)Find the x-intercept. (iii) Calculate the axis of symmetry. (iv)Find the coordinates of the vertex (v)Sketch the graph of the above function.

**Chemistry**

Complete and balance the following equations.Identify each type of the reactions. (a) Cr + O2 >Cr2O3: (b)Na2CO3 + Mg3(PO4)2: (c)H3BCO+ H2O> B(OH)3 + CO + H2:

**chemistry**

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

**chemistry**

compleat and balance this equation. Na2CO3+Mg3(PO4)2

**Chemistry**

what is the name of the ions that are formed when the following compounds dissolve in water. (a) BaBr2 (b) (NH4)2CrO4 (c)HBr

**Agriculture**

Why is there difference in the quality of the poultry products?

**science**

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

**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.

**Chemistry**

Based on CaCo3 + 2HCl --> H2O + CO2 + CaCl. How many ml of 1.00 M NaOH should be used in the titration. 25ml of HCL and 750mg of Tums are combined to simulate an upset stomach.

**Chemistry**

Based on CaCo3 + 2HCl --> H2O + CO2 + CaCl. How many ml of 1.00 M NaOH should be used in the titration. 25ml of HCL and 750mg of Tums are combined to simulate an upset stomach.

**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?

**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?

**physics**

A large grinding wheel in the shape of a solid cylinder of radius 0.330 m is free to rotate on a frictionless, vertical axle. A constant tangential force of 260 N applied to its edge causes the wheel to have an angular acceleration of 0.795 rad/s2. (a) What is the moment of in...

**English 8R - Homework Check (plzzzz read)**

hum its rather good a bit rushed with minor grammar issues

**7th grade science ASAP please!**

ur answers r right

**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

**math**

Jsmine has 8 packs of candle wax to make scented candles. Each pack contains 14 ounces of wax.Jasmine uses 7 ounces of wax to make one candle. How many candles can she make?

**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 = 1.06 s? Repeat for...

**math**

each of the natural numbers 2 through 100, inclusive, is factored in its prime factorization. how many factors of 5 are in the collection of factorizations?

**statics**

A cantilever beam member made from steel with hollow circular cross section experiences an axial load of 300 KN (F1), and a vertical load of 200 kN (F2) as shown in the following figure. The outside diameter of the beam is 50mm and the uniform wall thickness of the cross secti...

**statics and strengths**

A cantilever beam member made from steel with hollow circular cross section experiences an axial load of 300 KN (F1), and a vertical load of 200 kN (F2) as shown in the following figure. The beam is 300mm long and fixed on one end.

**flvs**

Your teacher has a jar of chocolate candies. For every completed assessment, she gives herself three pieces of chocolate. candies eaten after 67 completed assessments

**Chemistry**

If 20ml of a 2.0M solution of HCl is diluted to 500mls, what is its new molarity? How do I work this out

**chemistry**

if 240ml of O2 gas increases pressure from 0.40 atm to 0.80 atm what is the new volume? show all work

**Chemistry**

A saturated Ni(OH)_2_ can be prepared by dissolving 0.239 mg of Ni(OH)_2_ in water to make 500.0 mL of solution. What is the Ksp for Ni(OH)_2_?

**calculus**

if f(x) = square root of e^2x +1, then then f'(0) equals what?

**calculus**

for abs value of x <1, the derivative of y= ln square root 1-x^2 is.....?

**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

**Geometry**

A(4,1),B (6,3)

**history**

Abraham Lincoln so far.

**history**

I need help with making an abc book with letters of the alphabet with most Imprtant people or moment. Please help!

**U.S. History**

false

**Civics (The American President Movie)**

how was the system of checks and balances was presented in the American president movie

**math**

Find the general solution using the method of undetermined coefficients. y''' - 10y'' + 25y' = e^(-x) cos x + e^(5x) + x.

**physics**

10.6 t/s

**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 dont agree with decisions, but you do not say anything. which of the following is the MOST probable sit...

**business communication**

What do you think of D?

**business communication**

that its a group of international business executives so they would have to gather information about this investment if it would be a good choice

**business communication**

would the sentence "Time is Money!" be a good opening line for a letter urging a group of international business executives to come to an immediate decision about an investment opportunity? a. yes, because then they would realize that a delay could hurt them financia...

**Business Communication**

thank you

**Business Communication**

Please submit your end-of-year report by December 31 so we can include your accomplishments in our report to the Corporate Offfice due january 20." is it appropriate to give the report due date in this sentence? a. no, ebcause the reader will not believe that the write ca...

**Business Communication**

thank you

**Business Communication**

You ask for feedback on a proposal and are told "I don't believe your claims. Your facts must be wrong." You are confident that your facts are indeed correct. You should: a. write a memo to the proofreader's supervisor before sending the final proposal b. mak...

Pages: <<Prev | 1 | **2** | 3 | Next>>