Friday

April 18, 2014

April 18, 2014

Total # Posts: 118

**science**

A solutuion is prepared by adding 40 grams of NaC1 to 100 grams of water at 80 degrees Celcius. Describe this solution.

**PHYSICS**

Any hint for b? and c?

**PHYSICS(help)**

@Pete c) How do we deduce how far back the block moves with te energy difference obtained?

**calculus**

Find the definate integal (upper limit 1, lower limit 0) (7-4x)^2dx

**calcus**

int sec u du

**calcus**

int tan^3xsec^3x dx

**calcus**

int cosxsinx dx

**physics**

What is the self-inductance of an air-core solenoid,1m long and 0.05m in diameter,if it has 1400 turns?(a)5.23mH(b)4.84mH(c)3.63mH(d)2.42mH

**physics**

A magnetic field is applied to the plain of a flat coil of copper wire. The time variation of the magnetic flux density is given by Bosinwt.At which of the following values of t is the magnitude of the emf induced in the coil a maximum.(a)T/8(b)3T/8(c)3T/4(d)T/2

**physics**

If two wires P and O each of the same length and same material,are connected in parallel to a battery. The diameter of P is half that of Q. What fraction of the total current passes through P?(a)0.2(b)0.25(c)0.33(d)0.5

**statistics**

suppose that grade point averages of undergraduate students at one university have a bell shaped distribution with a mean of 2.55 and a standard deviation of 0.43. Using the empirical rule, what percentage of students have grade point averages that are between 1.26 and 3.84

**maths**

If four coins are flipped in succession,then the number of possible outcomes is(a)8(b)12(c)16(d)14

**physics**

A proton with speed v perpendicular to a magnetic field B is experiencing a force F.If the speed of the proton is doubled,the new force is (a)F/2(b)F(c)2F(d)4F

**calculus**

Find dy/dx, if y= 5e^x/cosx

**calculus**

Find dy/dx, if y= (sinx)^-1

**physics**

An electrical source with internal reistance r is used to operate a lamp of resistance R. What fraction of the total power is delivered to the lamp?(a)R+r/R(b)R-r/R (c)R/R+r (d)R/r

**maths**

If two dice are toced what is the probility of having a sum of 5 as the outcome(a)1/9(b)1/6(c)1/8

**Math**

Factorise : 1 + a + b + c + ab + bc + ca + abc

**English**

(mean,means)Fluoridated water.........fewer Americans are toothless today. (visit,visits)Grandparents and children alike..........their dentist for regular check ups. (love,loves)Dentists.......the fact that there is more awareness about dental hygeiene. (is,are)Despite the de...

**Maths**

1) Simplification (trigonometric ratios of allied angles)? Simplify : i) [cos^2 (2x180-A). tan^2 (180+A). sec^2 (180-A)] / [ sin^2 (3x180+ A). cosec^2 (-A). cot^2 (90+A)] ii)[ cos(90+A). sec(270+A). sin(180-A) ] / [ cosec (-A). cos (270-A). tan (180+A) ] Find values of x and y...

**math**

what is the formula for working out open cuboid.

**math**

what is the formula for working out open cuboid.

**math**

A pump brings underground water up to ground level. The water flow is measured in litres per minute.The pump fills an 18 litre bucket in 7 seconds.what is the speed of the pump flow

**physics**

the key is "net force". in both cases acceleration is zero. therefore net force is also zero. Newton's second law, Fnet = mass * accel

**high shoool algebra**

Joy is 20 years older than Bob. Three years ago, Joy was 5 times as old as Bob. How old are they now?

**Trigonometry**

Three ships are situated as follows: A is 225 miles west of C while B, due south of C, bears S25*10'E from A. a. How far is B from A? b. How far is B from C? c. what is the bearing of A from B? PLEASE EXPLAIN

**Trigonometry**

Points A and B 1000 meter apart are plotted on a straight highway running east and west. from A, the bearing of tower C is N32*W and from be, the bearing of C is N64*E. approximate the shortest distance of the tower from the highway. please explain........

**Trigonometry**

A plane is headed due east with airspeed of 240 mph. if a wind at 40 mph is bloiwing from the north , find the ground speed of the plane.

**Trigonometry**

Two sides of a right triangle are 8, 15 and 17 units. if each side is doubled, how many sqare units will the area of the new triangle be?

**Trigonometry**

A ladder 5 meter long leans against the wall of an apartment house forming an angle of 50 degrees, 32 minutes with the ground. how high up the wall does it reach?

**Trigonometry**

Triangle ABC is a right triangle with right angle at C. CD is perpendicular to AB. BC=4 and CD=1. find the area of the triangle ABC.

**Trigonometry**

The hypotenuse of a right triangle is 34cm. find the length of the two legs, if one leg is 14cm longer than the other.

**Trigonometry**

The perimeter of an isosceles triangle is 6.6824. find its area.

**geometry**

4X Over 30

**linear math**

8x + 6y = -15

**Math**

16

**science(chem)**

How many moles of sulfate ions are present in 1.2 mol of aluminum sulfate?

**umt**

2. A charge of -3.00 µC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass (radius = 0.1 m). The charges on the circle are -4.0 µC at the position due north and +5.0 µC at the position due east. What is the magn...

**physics 12**

A spacecraft of mass 470 kg rests on the surface of an asteroid of radius 1400 m and mass 2.0*10^12. How much energy must be expended so that the spacecraft may rise to a height of 2800 m above the surface of the asteroid? Thanks.

**College Chemistry**

Plaster of Paris is the compound calcium sulfate hemihydrate, CaSO4*1/2H2O What mass of water is liberated when a 2.763 gram sample is heated to constant mass? The sample is 2.763 grams How much of the 2.763 gram sample is water? I need an amount in grams. Amount of anhyrdate ...

**College Chemistry**

Plaster of Paris is the compound calcium sulfate hemihydrate, CaSO4*1/2H2O What mass of water is liberated when a 2.763 gram sample is heated to constant mass?

**physics 12**

If the Earth has a mass of 5.98*10^24 kg and orbits the Sun at a radius of 1.43*10^11 meters. Find the mass of the Sun. Thank you.

**algebra **

10x.12.25y _______________ 2z.30x.20y help

**Biology**

b protien

**Chemistry**

I need to calculate this and I am to asume that all numbers are measurements. I am working with signifigant figures. .6260-.015

**English (Essay)**

Indent you paragraph. I think I understnad what you are trying to say when you say helpless individuals but it makes you sound as though you are obliterating there rights. I don't think that most of your words are biased, I think they are descriptive and I think that is wh...

**chemistry**

A NASA satellite showed that in 2003 the ozone hole was much larger than it was in 2002. The 2003 hole measured 1.04 x 107 mi2 in diameter, while the diameter of the 2002 hole was 6.9 x 106 mi2 Calculate the difference in size between the two holes in square meters.

**Microeconomics**

When is international trade an opportunity for workers?

**Finance**

Having previously identified the location of its Greenfield investment, Acme, a multi-billion public MNE that is incorporated in the U.S., must next obtain external financing for its proposed overseas production facility. It has been estimated that the acquisition will cost $5...

**science**

(1) what measurements and what calculation would you need to make in order to determine the density of a rectangular wooden block? (2) a student announced that she had made a sample of a new material that had a density of 0.85g/cm3. from the inforation given, are you able to d...

**science**

(1) what measurements and what calculation would you need to make in order to determine the density of a rectangular wooden block? (2)

**math**

find the slope of the line given by each equation (1) 7x+13y=91 (2) 7-3y=9x

**statistics**

The participants in a weight-loss class lost the following weights (in pounds) after three weeks of dieting:3,6,0,3,0,0 Assuming that these weights constitute an entire population, find the standard deviation of the population. Round your answer to at least two decimal places....

**8th grade math**

if you know that AB=0 and A not=to B, what can you say about the equation Ax+By=1? Describe the graph.

**math**

if 2/5 of my money is $4.00 how much is 1/2 of my money.

**math**

if 2/5 of my money is $4.00 how much is1/2 OF MY MONEY

**Numerical Analysis**

Using the bisection method, Newton’s method, and the secant method, find the largest positive root correct to three decimal places of x3 − 5x + 3 = 0. (All roots are in [−3,+3].)

**algebra**

11b,6=b-5

**algebra**

3/x-5=10/x+2

**math**

3 10 ____ = ____ x-5 x+2

**Pre-Calc**

Thank u both

**Pre-Calc**

Can someone show me how to do this please. I am stuck. find a number x such that e^2x – 12e^x =13

**Pre-Calc**

Thank you mathmate

**Pre-Calc**

I am stuck solving this problem, any help please..Many thanks find all numbers x that satisfy the given equation ln(2x) ------- =2 ln(3x)

**Pre-Calc**

I am seeking help with this problem Please...Thank you! Find the point on the line y=x+3 in the xy-plane that is closest to the point (3, 2)

**Calculus**

Use the given derivative to find all critical points of 'f' and at each critical point determine whether a relative maximum, relative minimum, or neither occurs. Assume that 'f' is continuous everywhere. f' (x) = (1-2x)/ ∛(x+3)

**Calculus**

Use the given derivative to find all critical points of 'f' and at each critical point determine whether a relative maximum, relative minimum, or neither occurs. Assume that 'f' is continuous everywhere. f' (x) = (1-2x)/ ∛(x+3) ∛(x+3)in words is...

**Calculus**

Use implicit differentiation to show dy/dx = [(1-xy)cot(y)]/[x^2 cot(y) + xcsc^2(y)] if xy = ln(x cot y).

**advanced algebra**

Q. x^-4/5=16 What is x Q. Suppose 0<a<1. Arrange the following from smallest to largest z^-a,z^a,z^1/a,z^-1/8.

**calculus**

Prove that the limit as n approaches infinity of ((n!)^2)/(2n)! is 0. I'm thinking that you have to use the squeeze theorem, but I'm not quite sure how. help please?

**math**

Prove that the limit as n approaches infinity of ((n!)^2)/(2n)! is 0. I'm thinking that you have to use the squeeze theorem, but I'm not quite sure how. help please?

**social studies**

how do reform leaders today try wo win support for their causes? thanks

**algebra**

simplify and write with only positive exponents 1. x to yhe negitive six power times x to the fifth power 2. y to the negitive twelth power divided by 7y to the fifth power

**Fractions**

I'm pretty sure its 4

**Physics**

It says it itself: drum diameter = wavelength for 18.5kHz wavelength = V/f = 330/18500 (metres) or 1.78 cm

**math**

143

**math **

amy drove her car the same distance in six hours that juan drove his car in 5 1/2 hours. find the speed (rate) of amy's car, given that she drove 5 mi/h slower than juan.

**math**

150>4s+2*3s + 2*(15-5s) solve for s

**math**

Now the largest: Perimerter sum <150 150>4s+2w+2l 150>4s+2*3s + 2*(15-5s) solve for s, then w, then l.

**Math**

a rectangle is 3 times as wide as a square. the rectangle's length is 15 ft shorter than 5 times the square's length. Given that the sum of the two perimeters must be less than 150 ft, find the set of all possible lengths for the rectangle

**english**

is there a website for summary notes for old jules by mari sandoz?

**english**

does anyone know where i can find book notes on old jules by mari sandoz?

**Math**

find three consecutive even intergers for which the sum of the first two integers is greater than 9 more than the third integer, and the sum of the first and third integers is less than 17 more than the second integer

**geometry**

what is the area of a square with a radius of 9? I think the answer is 18 square or 324 Thank you

**chemistry**

determine wheter each of the following reactions occur. 2Ni(s) + MgSO4(aq)---> if it doesnt occur explain why

**Please help Math**

Gravel is being dumped from a conveyor belt at a rate of 20 cubic feet per minute. It forms a pile in the shape of a right circular cone whose base diameter and height are always equal to each other. How fast is the height of the pile increasing when the pile is 23 feet high?

**geometry**

you just got a n ew dirt bike with really advanced four stroke engine that burns fuel efficiently and you wonder what kind of gas mileage you are getting. like most dirt bikes your new machine has no odometer to record the miles traveled.The rear tire's outside diameter is...

**6th grade**

1)Bradley is buying ice cream cones. a double scoop cone cost x dollars. A single scoop costs $0.50 less than a double csoop. A triple scoop cone costs twice as much a single scoop cone. Write an expression to represent the cost of 3 double scoop cones and 1 single scoop cone...

**Social Studie's**

Name 3 thing's that took place during the Renaissance?

**Poem:Birthday by M.T Buckley**

"Enemy territory" is cynical but "Suicide missions" refers to the fact that we start dieing at birth and "slapped me around a bit" just refers to the doctor spanking the baby to make it breath.

**6th grade math**

Name 3 thing's that took place during the Renaissance?

**math**

in the 10th

**math**

example- tax GAINS= tax on big gains, cof fee= coffee break job in job= in between job thanks!!

**math**

will some one please!!!! please!!! help me I'm doing wacky wordies, only have 3 to do!!! decimal decimal decimal ed ot overs pos'-i'-tive' thanks so much!!

**6th grade Social Studies**

Name 3 thing's that took place during the Renaissance?

**8th grade**

Can you unscramble these letters:afsedrniru?

**8th grade**

Can you unscramble these letters:afsedrniru

**english**

could anyone please tell me how i can find out what some ancient rome words mean? thanks!!

**geometry**

brain teasers!!! 7 = h. of r. 10 = a. in the b. of r. 4=h. of the a. thanks!!!!

**Geography**

The many islands that stretch from Florida to Venezuela are referred to as the? Thanks!!!!