Saturday

April 30, 2016
Total # Posts: 2,927

**calculus**

f(x,y)=x^2+2y^2 use the gradient vector Þf(5, 1) to find the tangent line to the level curve f(x, y) = 27 at the point (5, 1). answer choices: 1. 10x + 4y = 27 2. 2x + 4y = 27 3. 5x + 2y = 27 4. 10x − 4y = 27 5. 5x − 2y = 27
*November 17, 2010*

**calculus**

Use differentials to estimate the amount of tin in a closed tin can with diameter 6 cm and height 14 cm if the tin is 0.046 cm thick.
*November 17, 2010*

**arithmetic**

dude why do you put su hard question on here and nobody can do it
*November 17, 2010*

**geometry **

draw an acute scalene triangle ABC in the center of your paper with sides approximately 8cm 10cm and 16cm
*November 17, 2010*

**Math**

5 mins.
*November 16, 2010*

**4th grade math**

31 X 19 in expanded algorithm
*November 16, 2010*

**chem**

let's say that an average egg has a mass of 48 g. What mass would a mole of eggs have?
*November 16, 2010*

**chemistry**

Surface tension explains which of the follow- ing phenomena? I) A piece of aluminum foil floating on a lake II) A bowling ball sinking more slowly through molasses than through water III) Separating ethanol from water by distillation IV) Water beading on a windshield during ...
*November 14, 2010*

**math; distributive property;perimeter of a triangl**

4+4+3h+2
*November 14, 2010*

**Physics **

you use the mg-(2.3E2*cos21)for fnormal...bobpursley you really should check your work before...
*November 13, 2010*

**economics**

drop in output
*November 11, 2010*

**geomtry**

Figure it out
*November 11, 2010*

**physics**

How much spring elasticity would be needed to make a 50 pound child jump higher
*November 10, 2010*

**Physics**

17.4
*November 10, 2010*

**physics**

A bus traveling 85 km/hr is brought to a stop in 135 m. If the mass of the bus is 2250 kg, what was the retarding force provided by the brakes? Formula please
*November 9, 2010*

**Algebra**

Thank you
*November 8, 2010*

**Algebra**

why 32?
*November 8, 2010*

**Algebra**

4a/16 + a/16 =?
*November 8, 2010*

**1st grade**

the girls past was bad
*November 8, 2010*

**physics**

A man pushes on a piano of mass 180 so that it slides at a constant velocity of 12.0 down a ramp that is inclined at 11.0 above the horizontal. No appreciable friction is acting on the piano. Calculate the magnitude and direction of this push A. if the man pushes parallel to ...
*November 8, 2010*

**chemistry**

A propane barbeque is used to heat up 400g of water in an aluminum pot until it is boiling. Using the following information, calculate the molar enthalpy of propane. You can assume the temperature of the water and the temperature of the aluminum pot are always the same. ...
*November 7, 2010*

**chemistry**

A 10.0 g sample of liquid gallium metal, at its melting point, is added to 50.0g of water. The initital temperature of the water is 24.0 degrees C. If the molar enthalpy of freezing gallium is -5.54 kj/mol, what is the final temperature of the water? Thanks
*November 7, 2010*

**PHILOSOPHY**

What was William of Ockham's position on predestination? Where is a good sight to find imformation on this subject?
*November 7, 2010*

**math**

What are the measures of the angles of a right triangle with side lengths of 1, 2, and sqroot of 2? please show/explain work
*November 7, 2010*

**MATH**

a ball of radius 1 is dropped into a V-shaped gutter. The ball touches the gutter's sides at the ball's equator. If the shortest distance from the surface of the ball to the vertex of teh gutter is 1, what is the angle formed by the sides of the gutter?
*November 7, 2010*

**math**

a ball of radius 1 is dropped into a V-shaped gutter. The ball touches the gutter's sides at the ball's equator. If the shortest distance from the surface of the ball to the vertex of teh gutter is 1, what is the angle formed by the sides of the gutter?
*November 7, 2010*

**math algebra**

how would i do this problem elina and teresa raced on their bikes to the library after school. they both left at 3:00 pm and bicycled along the same trail elina rode at the speed of 12 miles an hour and teresa rode at the speed of 9 mph. elina got there 15minutes before teresa...
*November 4, 2010*

**calculus**

A rectangle is constructed with its base on the diameter of a semicircle with radius 5 cm and with two vertices on the semicircle. What are the dimensions of the rectangle with maximum area?
*November 4, 2010*

**calculus**

A square-based, box-shaped shipping crate is designed to have a volume of 16ft^3. The material used to make the base costs twice as much (per ft^2) as the material in the sides, and the material used to make the top costs half as much (per ft^2) as the material in the sides. ...
*November 4, 2010*

**math**

I don't know😩😩😩😩😩😩😩😩😩😩😩😩😩😩😩😩😩😩😩😩😩😩😩😩😩😩😩
*November 4, 2010*

**chem**

A scuba diver's tank contains .25 kg of oxygen compressed into a volume of 4.3 L (for oxygen, 32g = 1 mole) Calculate the gas pressure inside the tank at 9 degrees Celsius What volume would this occupy at 26 degrees Celsius and .95 atmospheres? can someone tell me how many...
*November 2, 2010*

**chemisty help please**

I still don't get it.. lol
*November 2, 2010*

**chemistry**

I looked at that guys and i still dont get it.
*November 2, 2010*

**chemistry**

A scuba diver's tank contains .25 kg of oxygen compressed into a volume of 4.3 L (for oxygen, 32g = 1 mole) Calculate the gas pressure inside the tank at 9 degrees Celsius What volume would this occupy at 26 degrees Celsius and .95 atmospheres?
*November 2, 2010*

**Algebra**

Hot Java Coffee Company adverties their decaffeinated coffee as 97% caffeine free as compared to their regular caffeinated coffee. If a cup of coffee is 8 ounces, how many ounces of decaffeinated coffee would you have to drink to get the equivalent amount of caffeine found in ...
*November 2, 2010*

**chemistry**

What volume of HCl gas is produced by the reaction of 2.4 liters of H2 gas with 1.5 liters of Cl2 gas? (Volumes are at the same T and P.) 1. 3.0 liters 2. 4.8 liters 3. 0.75 liters 4. 2.4 liters 5. 1.5 liters
*November 1, 2010*

**Chemistry**

no .43 was right u dumbasses
*November 1, 2010*

**Word within the Word Analogy Help**

how fast can you answer??
*November 1, 2010*

**chemistry**

Thanks, I thought I could use Boyle's Law, but it seemed too easy.
*November 1, 2010*

**chemistry**

Two gases are contained in gas bulbs connected by a valve. Gas A is present in a 56 L bulb at a pressure of 213 torr. Gas B exerts a pressure of 683 torr in a 74 L bulb. What is the partial pressure of gas B after they equilibrate once the valve has been opened? Answer in ...
*November 1, 2010*

**chemistry**

Calculate the number of carbon atoms in 0.75 L of acetone (CH3COCH3). (density = 1.3 g/mL and boiling point = 48.5 degrees Celsius)
*October 31, 2010*

**chemistry**

CaCN2
*October 31, 2010*

**chemistry**

Consider the following reaction: CaCN2 + 3H2O ¨ CaCO3 + 2NH3 105.0 g CaCN2 and 78.0 g H2O are reacted. Assuming 100% efficiency, which reactant is in excess and how much is leftover? The molar mass of CaCN2 is 80.11 g/mol. The molar mass of CaCO3 is 100.09 g/mol. 1. ...
*October 31, 2010*

**poetry**

Can someone explain what the poem is trying to tell in "Ode to the West Wind" I read from other sites but I don't understand it... I believe that it is talking about death...
*October 29, 2010*

**biochemistry**

wfwfrgffdgbhyujhyujb
*October 29, 2010*

**Chemistry**

47 mL
*October 28, 2010*

**chemistry**

89.8%
*October 27, 2010*

**physics**

find the force exerted by the rope on the car when the angle is 2.9 degrees and you are pulling with a force of 384 N but the car does not move
*October 27, 2010*

**calculus**

Find parametric equations for the line through the point P(2, 9, 4) that is parallel to the plane x + y + z = 6 and perpendicular to the line x = 5 + t , y = 5 − t , z = 5t . Answer Choices: 1. x = 2 + 6t, y = 9 + 4t, z = 4 + t 2. x = 2 + t, y = a + t, z = 4 − 2t ...
*October 27, 2010*

**calculus**

Find an equation for the surface consisting of all points P(x, y, z) equidistant from the point P(0, 1, 0) and the plane x = 3. Answer Choices: 1. y2 + z2 − 6x + 2y − 8 = 0 2. x2 + z2 + 6y − 2z − 8 = 0 3. y2 + z2 + 6x − 2y − 8 = 0 4. x2 + z2...
*October 27, 2010*

**calculus**

If a is a vector parallel to the xy-plane and b is a vector parallel to k, determine |a ~ b| when |a| = 3 and |b| = 2. 1. |a ~ b| = −6 2. |a ~ b| = −3ã2 3. |a ~ b| = 3 4. |a ~ b| = 3ã2 5. |a ~ b| = 0 6...
*October 27, 2010*

**Statistics**

z = 50
*October 26, 2010*

**physics**

fail...
*October 25, 2010*

**physics**

You are given a vector in the xy plane that has a magnitude of 84.0 units and a y component of -49.0 units. Assuming the x component is known to be positive, specify the vector V which, if you add it to the original one, would give a resultant vector that is 71.0 units long ...
*October 25, 2010*

**physics**

NVM!
*October 25, 2010*

**physics**

When Mary is 22 m from the finish line, she has a speed of 4.0 m/s and is 5.0 m behind Sally, who has a speed of 5.0 m/s. Sally thinks she has an easy win and so, during the remaining portion of the race, decelerates at a constant rate of 0.51 m/s^2 to the finish line. What ...
*October 25, 2010*

**american studies**

henry hudson
*October 24, 2010*

**Physics**

If a car starts from rest and travels for 5.0 seconds with a uniform acceleration of +1.5 m/s2. The driver then applies the brakes for 3.0 seconds, causing a uniform acceleration of - 2.1 m/s2.
*October 23, 2010*

**physics**

isnt it 9.81 m/s^2?
*October 22, 2010*

**physics**

dhis
*October 21, 2010*

**math**

wolfram alpha!
*October 21, 2010*

**physics**

it was a stupid format and i ran out of tries. Basically it wanted me to divide .707 by .293. The worst part is that it was worth a lot =[ o well
*October 21, 2010*

**physics**

In the vertical jump, an Kobe Bryant starts from a crouch and jumps upward to reach as high as possible. Even the best athletes spend little more than 1.00 s in the air (their "hang time"). Treat Kobe as a particle and let ymax be his maximum height above the floor. ...
*October 21, 2010*

**physics**

so i get v(t)=-(13*5)/t
*October 21, 2010*

**physics**

I would know how to solve this problem if i were to understand the whole t/t_0 thing. I dont know how to integrate something like that. Could you please explain how to get it started
*October 21, 2010*

**physics**

The velocity of a particle constrained to move along the x-axis as a function of time t is given by: v(t)=-(13/t_0) sin(t/t_0). a)If the particle is at x=4 m when t = 0, what is its position at t = 5t_0. You will not need the value of t_0 to solve any part of this problem. b)...
*October 21, 2010*

**physics**

What angle does the tangent to the curve y(x)=sin^2(x/9)+16sin(x/9) at x=9\pi make with the x-axis?
*October 21, 2010*

**physics**

E^2/(e^(E/T)-1)Evaluate dn/dE at fixed T and enter it below.
*October 21, 2010*

**College Chemisty**

Al
*October 20, 2010*

**Math [Interest]**

Okay, so I've been away from school for three weeks, and we have a math test tomorrow. I only just found out, and my friend emailed me the review questions. If someone could help me out, and show me how to do this, I'd appreciate it. No, I do not want someone to do my ...
*October 20, 2010*

**math**

it is impossible
*October 20, 2010*

**chemistry**

Fgghyh
*October 20, 2010*

**spanish**

what does que te encatanda mas,el chocolate o la pizza mean
*October 19, 2010*

**Physical Science**

Would the change be a negative number?
*October 19, 2010*

**Physical Science**

A 1.0 kg glass bowl at 37 °C is placed in a freezer. How much heat will the freezer have to remove from the bowl to take it to 0 °C? (cglass = 0.2 cal/deg-gm)
*October 19, 2010*

**Trig**

If b=5 , the angle C=50 and the angle A=50 find the other angle B and the remaining sides and . Give your answer to at least 3 decimal places.
*October 18, 2010*

**Chemistry**

A. 1.6×±0^-4 M B. 6.3% C. 3.2×±0^-4 M
*October 18, 2010*

**engineering**

Using mechanics of materials principles, (i.e. equations of mechanical equilibrium applied to a free-body diagram), derive the following equations: s’ = s cos2q = s[(1+ cos 2q) / 2] t' = s sinq cosq = s [sin 2q / 2] s=sigma, q=theta, t=tau I have looked in "...
*October 18, 2010*

**Math Algebra**

kassie an kesya are dividing $39 into two parts in order that the sum of 2/3 of one part and 3/4 of the other part is $28. What are the parts?
*October 18, 2010*

**PLEASE HELP**

WOULD IT BE 13 OVER 30
*October 17, 2010*

**PLEASE HELP**

PLEASE ANSWER THE FRACTION 14 OVER 15 - THE FRACTION 1 OVER 2. HURRY!
*October 17, 2010*

**calc**

(e^x + e^-x)/2=1
*October 17, 2010*

**Math **

so the answer is 7/12?
*October 17, 2010*

**history**

i know how to write an essay, it's this topic that i need help with, like what can you learn from it? and was it neccesary or not?
*October 17, 2010*

**history**

explain reign of terror face in the french revoloution. discuss robesperre's involvement and evolution of \his political views. do u think it was neccessary in the revolution? what lessons can be learned from this event? i have to write an essay on this please give me any ...
*October 17, 2010*

**math**

wouldnt the distance be 3 miles though if the one mile train must travel 1 mile (distance of itsself) plus the distance of the other train which is 2 miles?
*October 17, 2010*

**math**

a freight train that is 1 mile long is traveling at 60mph. a second train that is 2 miles long is traveling 40mph. the trains are moving in opposite directions on parallel tracks. how many seconds does it take between the time their locomotives meet and their cabooses fully ...
*October 17, 2010*

**math**

find a such that f(x)= ax2-4x+3 has a maximum value of 12
*October 16, 2010*

**math**

find a such that f(x)= ax2-4x+3 has a maximum value of 12
*October 16, 2010*

**calculus**

Find the area of the region lying inside the polar curve r = 2(1 − cos theta) and outside the polar curve r + 4 cos(theta)= 0.
*October 13, 2010*

**calculus**

Find the area of the region lying inside the polar curve r = 2(1 − cos theta) and outside the polar curve r + 4 cos(theta)= 0.
*October 13, 2010*

**calculus**

find the area of the region bounded by the polar curve r=sqrt(6ln(theta)+3 as well as the rays theta=1 and theta=e
*October 13, 2010*

**psychology**

dont know
*October 13, 2010*

**Algebra 2**

Let (x1,y1) be a solution, other than (0,0), of a direct variation equation. Write an second direct variation equation whosegraph is perpindicular to the graph of the first equation.
*October 12, 2010*

**Physics**

Two identical point charges are fixed to diagonally opposite corners of a square that is .5m on a side. Each charge is 3.0E-6 C. How much work is done by the electric force as one of the charges moves to an empty corner?
*October 11, 2010*

**Science**

A mixture of 10.902 g if iron(II) oxide and 6.524 g of aluminum metal is placed in a crucible and heated in a high temperature oven, where a reduction of the oxide takes place: 3 FeO(s) + 2Al(ℓ) ! 3 Fe(ℓ) + Al2O3(s) . What is the limiting reactant? What is the ...
*October 10, 2010*

**Chemistry**

1.19 atm
*October 8, 2010*

**chemistry**

express liquid pentanol and gaseous oxygen as a chemical reaction
*October 8, 2010*

**math**

andy has 23 coins worth 3.65 consisting of only quarters and dimes.how manydimes does he have?
*October 5, 2010*