Friday

July 31, 2015

July 31, 2015

Total # Posts: 83,004

**problem solving**

The specific heat of carbon (graphite) is 0.71 J/(g·°C). How much energy is given off as a 2 gram piece of graphite cools from 120°C to 20°C?
*July 31, 2015*

**5th grade math**

so is that the answer
*July 31, 2015*

**5th grade math**

is the first one 1 whole??
*July 31, 2015*

**5th grade math **

what can be a word problem that can be represented by the equation 1) 1/4 + 3/4=? 2- 7/8=?
*July 31, 2015*

**maths literacy,life science,agriculture,history**

hi guys i would like you to help with this quation, I am doing grade11 and doing the above subjects .I am wodering what should i major in at varsity something intresting.
*July 31, 2015*

**Life orientation**

Five interview question you will use to evaluate the understanding of service delivery protest by the learners in your school
*July 31, 2015*

**math**

-15+7
*July 30, 2015*

**math**

How many ounces of an alloy containing 30% gold on the world market must be added to 10 ounces of an alloy containing 5% to produce an alloy containing 20% gold?
*July 30, 2015*

**math**

there are 10 white socks and 6 black socks in a drawer. vic reaches into the drawer without looking and picks a white sock. he keeps the first sock out and reaches into the drawer again. to pick a second sock. what is the probability that the second sock vic selects will also ...
*July 30, 2015*

**physics**

A stone thrown vertically upwards from the top of a building takes 3s to reach its maximum height . Find 1. The velocity with which it is thrown 2.the maximum height it reaches above the builibg
*July 30, 2015*

**spanish**

Teresa ___ dio una camara a mi.
*July 30, 2015*

**Mahlogonolo**

Mathematics on a cubic function what do the zeros on the graph mean
*July 30, 2015*

**Math Important!**

So it's: b=2a a=g-2 a=gw+2 There are 2 gw cards, so there must be 4 a cards. If there are 4 a cards, there must be 8b cards and 2 g cards. 8+4+2+2=16 So 16 is the answer.
*July 30, 2015*

**calc**

Let F of x equals the integral from 1 to 3 times x of the natural logarithm of t squared. Use your calculator to find F″(1).
*July 29, 2015*

**computer**

for an integer matrix, int trace(int *a,int n) { int t=0,i; for (i=0;i<n;i++) {t += *(a[i*n+i])} return t; }
*July 29, 2015*

**Physics**

A child pushes tangentially on a small hand driven merry- go- round. She is able to accelerate it from rest to 18 rpm in 10 s. Modeling the merry go round as a uniform disk of radius 2.5 m and mass 780 kg, find the torque required to produce that acceleration. Neglect the ...
*July 28, 2015*

**Physics**

A potter is shaping a bowl on a a potter’s wheel. The wheel rotaes at a constant angular speed. The frictional force between her hands and the clay is 1.25 N. How large is the torque she produces on the wheel if the diameter of the bowl is 13 cm.
*July 28, 2015*

**Physics**

Fred Flintstone’s club–ax is made up of two parts: an uniform 3.0 kg stick and a symmetrical 10 kg stone attached to the end of the stick. The dimensions of the club-ax are shown in the figure. How far is the center of mass from the handle end of the club-ax? Express...
*July 28, 2015*

**Physics**

A system consists of the following masses loacted in the xy- plane: 5.0 kg at the point (0,5), 7.5 kg at the point (3,8) and 6.5 at the point (-3, -6). Find the distance from the origin to the center of mass.
*July 28, 2015*

**Physics**

A uniform solid sphere rolls along a horizontal frictionless surface at 35 m/s and makes a smooth transition onto a frictionless incline having an angle of 300. How far up the incline does the sphere roll when it comes to a momentary stop? Note for a sphere I= 2/5Mr2, where M ...
*July 28, 2015*

**Physics**

Three children are trying to balance on a seesaw. The seesaw is 3.9 m long and pivots about a rock at its center. Louie and Laura are already sitting on opposite ends. If Martha weighs 27 kg, where should she sit so as to balance the seesaw? 50kg kid--------------35kg kid...
*July 28, 2015*

**AP Chemistry**

24.6gFe2O3*molFe2O3/MolarmassFe2O3*2molFe/1molFe2O3= mol Fe
*July 28, 2015*

**Physics**

Its an angle of 30 not 300
*July 28, 2015*

**Physics**

A uniform solid sphere rolls along a horizontal frictionless surface at 35 m/s and makes a smooth transition onto a frictionless incline having an angle of 300. How far up the incline does the sphere roll when it comes to a momentary stop? Note for a sphere I= 2/5Mr2, where M ...
*July 28, 2015*

**Physics**

A bolt requires tightening to a torque of 98 N-m. If a wrench is 28 cm long, what perpendicular force should be applied at its end?
*July 28, 2015*

**maths**

Volume of tank V = 4πradius^3/3 where radius of tank=1.5 m Pipe radius, r = 0.3 m pipe length (per second)=0.2 m Volume per second, v= πr^2*L Time = V/v in seconds.
*July 28, 2015*

**math**

please solve x- 11/21= -10/21
*July 28, 2015*

**Physics**

A system consists of the following masses loacted in the xy- plane: 5.0 kg at the point (0,5), 7.5 kg at the point (3,8) and 6.5 at the point (-3, -6). Find the distance from the origin to the center of mass.
*July 28, 2015*

**Geometry**

The area of a right triangle is 36. What is the shortest possible length of its hypotenuse? A.6 B.root72 C.12 D.none of these
*July 28, 2015*

**Logic**

This is the information about students participating in a field trip: 36 were female students, 13 were male seniors, 41 were not drama majors, exactly half of the drama majors were male, a third of the female students were drama majors but not seniors, there were 15 senior ...
*July 28, 2015*

**Physics**

A child pushes tangentially on a small hand driven merry- go- round. She is able to accelerate it from rest to 18 rpm in 10 s. Modeling the merry go round as a uniform disk of radius 2.0 m and mass 800 kg, find the torque required to produce that acceleration. Neglect the ...
*July 28, 2015*

**Geometry**

Given a triangle with side lengths: root3, root3, 3, find the measure of its smallest angle.
*July 28, 2015*

**Physics**

The spin-drier of a washing machine slows down uniformly from 700 rpm (revolutions per minute) to 140 rpm while making 50 revolutions. Find the angular acceleration through these 50 revolutions. Express your answer in rad/s^2.
*July 28, 2015*

**Physics**

A belt passes over a wheel of radius 25 cm. If a point on the belt has a speed of 26 m/s. How fast is the wheel turning? Express your answer in rad/s.
*July 28, 2015*

**government secondary school**

maths:x^4+3x-2/(x^2+1)^3(x-4)=(Ax+B)/(x^2+1)+(Cx+D)/(x^2+1)^2+(Ex+F)/(x^2+1)^3+G/(x-4)+H/(x-4)^2.fine the value of ABCDEFGH,it a partial fraction o plz i need the solution urgently
*July 28, 2015*

**Physics**

physics
*July 28, 2015*

**Physics**

Romeo takes a uniform 11 m ladder and leans it against the smooth wall of the Capulet residence. The ladder's mass is 18.0 kg, and the bottom rests on the ground 2.8 m from the wall. When Romeo, whose mass is 79 kg, gets 90% of the way to the top, the ladder begins to slip...
*July 28, 2015*

**Physics**

A particle is projected from the surface of Earth with a speed equal to 2.4 times the escape speed. When it is very far from Earth, what is its speed? ?km/s
*July 27, 2015*

**math**

oh thanks the question had a mistake it was what you said reiny
*July 27, 2015*

**math**

The dimensions of a box are 9 by 16 by radical 25. Its volume is a. 60 b. 3600 c. √(50) d. √(60) please explain
*July 27, 2015*

**math**

A.16 B.25 C.36 D.100 These are the choices for the question
*July 27, 2015*

**math**

The square of a certain whole number N is N squared.If 60 is a factor of N squared ,its possible that xis not a factor of N squared.
*July 27, 2015*

**English 9 grammar**

1. Which of the following is grammatically correct? (mixed constructions) A) Even though the boy left early does not mean he was sick. >>B) Even though the boy left early, it does not mean he was sick. 2. Which of the following is grammatically correct? (parallelism) A) ...
*July 27, 2015*

**English Vocab 9**

is number 6 B?
*July 27, 2015*

**English Vocab 9**

are all the rest right?
*July 27, 2015*

**English Vocab 9**

Jessica gave a ___________ account of the conversation she'd had with the police. ----A) verbatim B) decorous C) dilatory D) munificent 2. The _________ old apple seller on the street corner used to scare Sarah. A) copasetic B) pulchritudinous ---C) wizened D) ...
*July 27, 2015*

**English 9**

Hi teacher/ i posted this question and i am confused is number 1 A or C because they are kind of opposites.
*July 27, 2015*

**English 9**

1. Jessica gave a ___________ account of the conversation she'd had with the police. A) verbatim B) decorous ----C) dilatory D) munificent 2. The _________ old apple seller on the street corner used to scare Sarah. ------A) copasetic B) pulchritudinous C) wizened D) ...
*July 27, 2015*

**pre-calculus**

- sqrt of 2 over 2
*July 27, 2015*

**Math**

The question is how many kg of the first alloy must be used... So my answer is 2kg of first alloy, 4kg of 2nd alloy and 4kg of 3rd alloy resulting to 10kg.
*July 27, 2015*

**Math**

I don't think they should be equal to 10. kg of 1st alloy + kg of 2nd alloy + kg of 3rd alloy = 10 kg I got an answer, my answer is 2kg.
*July 27, 2015*

**Nat Sci**

???
*July 26, 2015*

**Nat Sci**

why when the granite decompose it converts to clay? and what is the simplest meaning of B horizon. i dont fully understand the things i've read about b horizon on net. please help me
*July 26, 2015*

**organic chemistry**

What does delocalization mean? what is the difference between non delocalizabe and delocalizable? Thank you in advance..
*July 26, 2015*

**math- partial fractions**

oops the first one should be s^2 +1
*July 26, 2015*

**math- partial fractions**

how do you i do the partial fraction for 1/(s^2)(s^2 +2s +3)
*July 26, 2015*

**statistics**

A lottery offers one $10000 prize, one $5000 prize and five $1000 prizes. 1000 tickets are sold at $30 each . Find the expectation if a person buys one ticket workings: 9970/1000+4970/1000+4850/1000-29790/1000 = -10000/1000 =-$10
*July 26, 2015*

**calculus problem I have tried 100 times**

A tank in the shape of an inverted right circular cone has height 5 meters and radius 4 meters. It is filled with 2 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=...
*July 26, 2015*

**writing **

15. Once you acquire these two basic skills, you'll be able to transform a vague idea in your mind into a coherent piece of writing.
*July 26, 2015*

**PHI 103**

25. <21{8[1(07)95]}> Political science professor: Many people insist that the Internet is revolutionizing the political process. They argue that Internet debates and online political polls and chat rooms give people greater access to political information. And they’...
*July 25, 2015*

**stats**

The average GRE score for math in a sample of students is 490. When you create a 95% confidence interval around this average, the lower limit is 260. What is the upper limit for this 95% confidence interval?
*July 25, 2015*

**statistics**

Of the Statistics graduates of a University 30%, received a starting salary of $45,000.00. If 5 of them are randomly selected, find the probability that all the graduated had starting salary of $45,000.00.
*July 23, 2015*

**Finance**

dfjghjh.kjkl
*July 23, 2015*

**algebra**

$50,000 was invested in bonds at %6and stocks at 8%. how much money was invested in each if the total return was $32,000?
*July 23, 2015*

**life orientation**

Im reaserching on how one another should engage in a protest, when ever there is an issue before or during a protest in the community?
*July 23, 2015*

**basic math**

The tank for a car holds 12 gallons. The gasoline gauge shows the tank is 14 full. How much gas is still in the tank?
*July 23, 2015*

**Physics/ Chemistry**

The carbon isotope 14C is used for carbon dating of objects. A 14C nucleus can change into a different kind of element, a neighbor on the periodic table with lower mass, by emitting a beta particle – an electron or positron – plus a neutrino or an anti-neutrino. ...
*July 22, 2015*

**Physics**

We commonly see Superman being shot and bullets bounce off of him. Suppose Mr. Bad shoots Superman with 4.00 kg bullets at a rate of 100 bullets/min for 9.00 s. If the speed of each bullet is 480.00 m/s and rebounds straight back with no change in speed, calculate the ...
*July 22, 2015*

**Physics**

An example of an elastic collision is The gravitational slingshot effect . A spacefship of mass 850 kg is moving at 9.5 km/s in the +x direction. It approaches the planet Saturn, mass 5.68 x10 26kg , which is moving in the –x- direction as shown in the figure. The ...
*July 22, 2015*

**Physics Momentum: Elastic Collision**

The carbon isotope 14C is used for carbon dating of objects. A 14C nucleus can change into a different kind of element, a neighbor on the periodic table with lower mass, by emitting a beta particle – an electron or positron – plus a neutrino or an anti-neutrino. ...
*July 22, 2015*

**Physics**

A 7900 kg truck traveling east at 5 m/s collides with a 1650 kg car traveling 300 south of west at 20 m/s. After the collision at what angle do the two vehicles move. Express you answer in degrees from the positive x-axis. Use a coordinate where north is the +y axis and east ...
*July 22, 2015*

**chemistry**

5.85gm of NaCl is dissolved in water and the solution is made up to 0.5 litre. what is the molarity of solution ????
*July 22, 2015*

**College Alg**

ax+4 -7=0 (1,-2) and (-6,3)
*July 22, 2015*

**Physics**

A 2.1-kg 15-cm-radius cylinder, initially at rest, is free to rotate about the axis of the cylinder. A rope of negligible mass is wrapped around it and pulled with a force of 14 N. (a) Find the magnitude of the torque exerted by the rope. ?N · m (b) Find the angular ...
*July 21, 2015*

**Biology**

a) Initial filtration occurs when blood pressure forces fluid out of the __________ and into __________. b) Blood enters the glomerulus through the __________ and leaves through the __________. c) Describe what normally passes into Bowman's capsule. d) What substances are ...
*July 21, 2015*

**Physics**

A steel ball of mass m1 = 1.1 kg and a cord of length of L = 2.3 m of negligible mass make up a simple pendulum that can pivot without friction about the point O, as in the figure below. This pendulum is released from rest in a horizontal position, and when the ball is at its ...
*July 21, 2015*

**math**

P=2L+2(L-2)=4L-4 so which of the following is an integer? (1998/4-1) (1999/4-1) (2000/4-1) (2002/4 -1)
*July 21, 2015*

**math**

seems to me all are true. it is an even power of x,y so either x=y or x=-y if x=y, then a thru d are true if x=-y, then a,b,c are true, but d is not true unless x=-y and x=+-1 so, the answers are a,b, c for any x and y.
*July 21, 2015*

**math**

let l be the border width. Then the total area of the new picuture with border is.. Areatotal=areapicutre+areaborder. areaborder=(12+2L)(16+2L)-12x16 288=24L+32L+4L^2 so solve for L, and the length of the fram is 16+2L
*July 21, 2015*

**english literature**

hi i have written a review below but its word limit is very high. please help me reduce it to around 200 words or a bit more. thanks in advance. 1. Introduction: Overwhelmed by political intrigue, confronted by a world adversarial to moral sensibilities, the play dramatizes ...
*July 21, 2015*

**Statistics **

A survey of 925 voters in one state reveals that 408 favor approval of an issue before the legislature. Construct the 90% confidence interval for the true proportion of all voters in the state who favor approval.
*July 20, 2015*

**Physics**

A 14 g bullet is fired into the bob of a ballistic pendulum of mass 1.6 kg. When the bob is at its maximum height, the strings make an angle of 60° with the vertical. The length of the pendulum is 2.3 m. Find the speed of the bullet. ?m/s
*July 20, 2015*

**math**

isnt that 13.20
*July 20, 2015*

**math**

At the rate of $.80 cents per $100, how much does it cost to insure a car against fire and theft for $ 1650
*July 20, 2015*

**Probability/Statistics**

1) 2800 2) combination 3) 2700 4) becomes all the same, 1 outcome of final 5) 1/4 ??????
*July 20, 2015*

**Science**

Final of geography
*July 20, 2015*

**social studies**

some parts of spain remained under muslim control for
*July 20, 2015*

**physics**

A golf cart has an acceleration of 0.4 m/s². What is its velocity after it has covered 10 m starting from the rest?
*July 20, 2015*

**physics**

The driver of a train traveling at 30 m/s applies the brakes when he passes an amber signal. The next signal is 1.5 km/h down the track and it reaches 75 seconds later. Assuming uniform acceleration, find the velocity of the train at the second signal.
*July 20, 2015*

**ethics**

Which of the following examples best demonstrates to most people that ethical progress has taken place over the past 200 years? (Points : 1) Laws that prohibit discrimination based on race Laws that have increased speed limits Laws that prevented women from voting Laws that ...
*July 20, 2015*

**organic chemistry**

what is the principle involved in the detection of phosphorus? the visible result of it is canary yellow
*July 19, 2015*

**english**

Select the choice which best identifies the given passage from "The Cask of Amontillado." "I forced the last stone into its position; I plastered it up. Against the new masonry I re-erected the old rampart of bones. For the half of a century no mortal has ...
*July 19, 2015*

**French**

Remplissez les tirets avec la bonne forme de "lequel" If my answers are correct. 1) C'est un travail a propos(de) duquel nous ne sommes pas d'accord. 2) Les bureaux auxquels j'ai envoye (a) une demande d'emploi ne m'a pas repondu 3) Il y a un ...
*July 19, 2015*

**Business Stats**

The average life expectancy of Canadian women is 75 years, and is normally distributed. The standard deviation is known to be 7 years. If a random sample od 49 women is taken, what is the probability that the average age of the sample of women is: Between 73.5 and 76 years? ...
*July 19, 2015*

**organic chemistry**

How will i know if the r group's common name is tert-pentyl or sec-penytl? What is the difference between sec and tert?
*July 19, 2015*

**Stats**

4) The amount of Jen’s monthly phone bill is normally distributed with a mean of $50 and a standard deviation of $10. Find the 25th percentile.
*July 18, 2015*