Saturday

December 20, 2014

December 20, 2014

Total # Posts: 61

**Calculus (math)**

A tank in the shape of an inverted right circular cone has height 7 meters and radius 4 meters. It is filled with 5 meters of hot chocolate. Find the work required to empty the tank by pumping the hot chocolate over the top of the tank. The density of hot chocolate is δ=...
*December 14, 2014*

**Maths**

An observer at the top of a lighthouse 55m Hugh sights a ship at a sea angle of depression of 18°. If the foot of the lighthouse is at sea level how far is the ship from the foot of the light house
*December 11, 2014*

**P.E check my answers**

1.Select the community activity that is a healthy choice to promote fitness for all ages A.annual 5K fun run for charity<--- B.annual state fair C.monthly movie in the park D.monthly laser light show at the planetarium 2.Mollie is well respected by her teammates even though...
*February 27, 2014*

**PHYSICS**

A velocity selector consists of electric and magnetic fields described by the expressions vector E = E k hat bold and vector B = B j hat bold, with B = 0.0140 T. Find the value of E such that a 670 -eV electron moving along the negative x axis is undeflected.
*October 30, 2013*

**physics**

We release an oil drop of radius r in air. The density of the oil is 640 kg/m3. C1 and C2 for 1 atmosphere air at 20∘ C are 3.90 × 10−4 (kg/m)/sec and 0.73 kg/m3, respectively. How small should the oil drop be so that the drag force is dominated by the linear...
*October 15, 2013*

**PHYSICS**

An air-filled capacitor consists of two parallel plates, each with an area of 7.60 cm2, separated by a distance of 1.70 mm. (a) If a 16.0 V potential difference is applied to these plates, calculate the electric field between the plates. kV/m (b) What is the surface charge ...
*October 13, 2013*

**physics**

An elevator is stopped at the ground floor. It starts moving upwards at constant acceleration a>0 for 5 seconds. It then keeps a constant speed for 35 seconds. Finally, it slows down with an acceleration of the same magnitude (but opposite direction) −a , until it ...
*October 7, 2013*

**physics**

An elevator is stopped at the ground floor. It starts moving upwards at constant acceleration a>0 for 5 seconds. It then keeps a constant speed for 35 seconds. Finally, it slows down with an acceleration of the same magnitude (but opposite direction) −a , until it ...
*October 7, 2013*

**8th grade math URGENT**

1 1/4 miles in 2 min and 4 seconds, or 1 3/16 miles in 1 min and 55 sec. Which is greater? $1.60 for 5 min or $19.50 for 1 hour. Which is greater? Look for a pattern in the expressions shown below. Use the pattern to write an expression for the sum of the whole numbers from 1 ...
*September 8, 2013*

**MATH**

the measures of the interior angles of a triangle are x,y and 2x respectively. if the triangle is isosceles, what is one possible measure of an angle of this triangle, in degrees?
*July 24, 2013*

**MATH**

how is it 200, 300 when it says it is 100 less than twice the preceding number... isnt it 200-100=100x2==200 again? im confused
*July 24, 2013*

**MATH**

the first number of a sequence is 200. every number of the sequence after the first is 100 less than twice the preceding number. what is the 5th number of the sequence
*July 24, 2013*

**physics**

One day I decide I want to see how high I can throw a rock. I throw a rock straight up in the air and it has a speed of 30 m/s when it leaves my hand. I then realize this was foolish, as I need to get out of the way before the rock comes back down and hits me on the head. How ...
*May 17, 2013*

**physics**

Two point charges +q=1 μC and −q=−1 μC with mass m=1 g are fixed at the positions ±r⃗ 0 with |r0|=1 m. The charges are released from rest at t=0. Find the time τ in seconds at which they collide. Hint: Can you do it without integrating ...
*May 17, 2013*

**MATHS**

Find the largest possible integer n such that there exists a non-constant quadratic polynomial f(x) with integer coefficients satisfying f(1)∣f(2),f(2)∣f(3),…f(n−1)∣f(n). Details and assumptions For (possibly negative or zero) integers m and k the ...
*May 17, 2013*

**MATHS**

How many positive integers n are there such that 10^n≤n^10?
*May 17, 2013*

**MATHS**

Find the number of real solutions of the system of equations. x^2−y^2=z y^2−z^2=x z^2−x^2=y
*May 17, 2013*

**MATHS**

A simple graph G has 200000 edges and for any 3 vertices v,w,x, at least one of the edges vw,wx,xv is not present in G. What is the least number of vertices that G can have? Details and assumptions A simple graph does not have multiple edges between vertices, or self loops.
*May 17, 2013*

**MATHS**

THANKS:D
*May 17, 2013*

**MATHS**

ABC is a triangle with a right angle at A. M and N are points on BC such that AM is the altitude, and AN is the angle bisector of ∠BAC. If CN/NB=21, what is CM/MB?
*May 17, 2013*

**MATHS**

For a set of numbers T, we say that T has distinct subset sums if all distinct subsets of T have distinct sums. How many subsets of {1,2,3,4,5,6,7,8} have distinct subset sums? Details and assumptions The empty set (the set of no elements) has a sum of 0 by convention.
*May 17, 2013*

**MATHS**

A national math contest consisted of 11 multiple choice questions, each having 11 possible choices, of which only 1 of the choices is correct. Suppose that 111 students actually wrote the exam, and no two students have more than one answer in common. The highest possible ...
*May 17, 2013*

**Maths**

Suppose a and b are positive integers satisfying 1≤a≤31, 1≤b≤31 such that the polynomial P(x)=x3−ax2+a2b3x+9a2b2 has roots r, s, and t. Given that there exists a positive integer k such that (r+s)(s+t)(r+t)=k2, compute the maximum possible value ...
*May 8, 2013*

**Maths**

The number 1000 can be written in several ways as a sum of one or more consecutive positive integers, for instance, 1000=1000 (one summand) or 1000=198+199+200+201+202 (five summands). Find the largest possible number of summands in a representation of 1000 as a sum of ...
*May 8, 2013*

**Physics help**

0.733
*May 8, 2013*

**algebra!!!! please help me!!!!**

i still dun get it :(
*May 7, 2013*

**math**

find the absolute minimum and maximum values of f(x)= x^(2/3) (3+x) on the interval [-2,1] i did a mistake on the other one sorry.
*April 29, 2013*

**math**

find the absolute minimum and maximum values of f(x)= x^(2/3) (3+x) on the interval [-2,1] i did a mistake on the other one sorry.
*April 29, 2013*

**calculus**

find the absolute minimum and maximum values of f(x)=x^(1/3) (3+x) on the interval [-2,1]
*April 28, 2013*

**Math**

What has a product of 320 and a sum of -36?
*February 26, 2013*

**Chemistry**

What volume does 0.25 moles of oxygen gas occupy ar STP?
*January 31, 2013*

**Chemistry**

What is the molar volume of the gas ammonia (NH³) at STP?
*January 31, 2013*

**Chemistry**

If you have 1 mole of baking soda (NaHCO³), then about how many atoms of oxygen do you have?
*January 31, 2013*

**Chemistry**

For the theoretically perfect reaction 2H² +O²---2H²O if you react 300 molecules pf hydrogen and 200 molecules of oxygen, how many oxygen molecules will you have that do not engage in the reaction? Answer 50, 100, 150, or 200?
*January 31, 2013*

**calculus**

What happened between -4 x log[1 + 3/(14 x)] = and -4 x [3/(14 x) + O(1/x^2)] = How did you get rid of the log? Thx in advance
*December 1, 2012*

**calculus**

take the limit as x goes to infinity: (14x/(14x+3))^(4x)
*December 1, 2012*

**Thermal Physics, Kinetic Theory of Gases**

Oxygen (O2) has a molar mass of 32 g/mol. (e) Suppose an oxygen molecule traveling at this speed bounces back and forth between opposite sides of a cubical vessel 0.10 m on a side. Find the average force it exerts on one of the walls of the container. (Assume that the molecule...
*November 1, 2012*

**art history**

Imagine that you are a prehistoric artist and write a 350 to 500 word story explaining why you are an artist and what the purpose of your art is. Be clear about what time period and location you are from. You may do research about prehistoric art, but be sure to include a ...
*August 14, 2012*

**Chemistry**

Never mind. i got it
*April 29, 2012*

**Chemistry**

wait but i keep negative values for the moles of HCl because I have a large volume of NaOH unlike the other problems...
*April 29, 2012*

**Chemistry**

Thank you so much!!!
*April 29, 2012*

**Chemistry**

What is the pH of the solution created by combining 12.30 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? mL NaOH:12.30 pH w/ HCl _________ pH w/ HC2H3O2 _________ What are the pH values if you take into account that the 8....
*April 29, 2012*

**Chemistry**

What is the pH of the solution created by combining 12.30 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? mL NaOH:12.30 pH w/ HCl _________ pH w/ HC2H3O2 _________ What are the pH values if you take into account that the 8....
*April 29, 2012*

**Chemistry**

well you dont have to be rude!
*April 27, 2011*

**Chemistry**

The recommended dosage of iodine-131 is 4.20 \mu{\rm Ci/kg} of body weight. How many microcuries of iodine-131 are needed for a 84.0 {\rm kg} patient with hyperthyroidism?
*April 27, 2011*

**Chemistry**

Strontium-85, used for bone scans, has a half-life of 64 {\rm d}.How long will it take for the radiation level of strontium-85 to drop to \frac{1}{8} of its original level?
*April 27, 2011*

**Chemistry**

The antacid Amphogel contains aluminum hydroxide Al(OH}3 How many milliliters of 2.00(M}HCl are required to react with 80.0 mL of 1.48 (M} Al(OH)3(s)? Al(OH)3(s)+ 3HCl(aq)to AlCl3(aq) + 3H2O(aq)
*April 9, 2011*

**Calculus**

Find the derivative of f. you may simplify before differentiating f(x)= x2-7x+12/x4-8x3+13x2+30x-72
*March 9, 2011*

**data**

In how many ways can 12 prizes be divided between 2 people? (combination question)
*November 15, 2010*

**math**

is that correct?
*November 11, 2010*

**Math**

On th decibel scale, the loudness of a sound, in decibels, is given by D=10log(I/I0), where I is the intensity of a sound barely audible to the human ear. If the intensity of a sound is 10^11I0, what is the loudness in decibels? (please note the I0 is supossed to be I lower 0.
*April 18, 2010*

**history**

Who was a democratic liberal during Reconstruction of the South?
*September 20, 2009*

**U,S History**

oh thankyou!
*September 20, 2009*

**language**

it's not there :(
*February 24, 2009*

**chemistry**

Calculate the equilibrium constant for the weak acid, CH3CH2CO2H, if the aqueous solution of CH3CH2CO2H that has an initial concentration of 1.97E-2 M has a [H+] of 5.00E-4. CH3CH2CO2H <=> CH3CH2CO2 + H i know that to figure out the equilibrium constant it is kc = ...
*April 24, 2008*

**chemistry**

How do i figure out the electron configuration of Fe(C2O4)3^3- ?
*April 22, 2008*

**chemistry**

oh sorry, all of them are in gaseous states
*April 19, 2008*

**chemistry**

Calculate the value of the equilibrium constant (Kc) for the reaction shown, if SbCl5 was found to be 5.57% decomposed at 521K when its initial concentration was 7.60M. SbCl5 <==> SbCl3 + Cl2
*April 19, 2008*

**Math**

Multiply or divide (a+5)[a(squred)-2]
*April 15, 2008*

**Math**

What percent of 120 is 36?
*April 15, 2008*

**CHEM!!**

In an experiment 5.57 +/- 0.02 grams of water chemically decomposes into the products hydrogen gas and oxygen gas. The measured mass of oxygen gas produced in the reaction is 4.9320 +/- 0.0001 grams. The hydrogen gas occupies a volume of 6902 mL. Report the density of the ...
*February 7, 2008*

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