Thursday

August 21, 2014

August 21, 2014

Total # Posts: 85

**Science**

Why carbon brushes is used in machinary, while carbon z a non metal?
*August 9, 2014*

**chemistry**

Are nitrogen which are converted 2 protein synthesis.
*August 8, 2014*

**wlac**

Kit borrowed $15,500 at 11% ordinary interest for 120 days. After 70 days, she made a partial payment of $3,000. What is the final amount due on the loan?
*November 17, 2013*

**Physics **

A hunter aims his gun and fires a bullet directly at a monkey. At the instant the bullet is fired, the monkey drops. The minimum speed for the bullet to hit monkey is..?
*November 9, 2013*

**Physics 12 Kinematics**

The bullet must go horizontally a distance, Dx, so Dx = Vh / t or t = Vh / Dx = VcosA / D and Vup = VsinA + gt .... or t = (Vup -VsinA) /g .... sub VcosA /D = (Vup -VsinA) /g .... V = D(Vup -VsinA)(g cosA)
*November 8, 2013*

**Physics 12 Kinematics**

Bullets horizontal displacement is Dx = (VoCos0)((VoSin0/9.8m/s^2x)2) I'm not sure how to fund the y position of the byllet is exactly the original height of the monkey - how fat it fell..?
*November 8, 2013*

**Physics 12 Kinematics**

And thank you so much for taking the time to help me.
*November 8, 2013*

**Physics 12 Kinematics**

I know that ss the bullet passes through the air, it will arc down due to gravity. If the monkey held the branch, and the hunter was far enough away, the bullet might pass beneath him, but because the monkey is falling while the bullet is travelling, he's going to get shot...
*November 8, 2013*

**Physics 12 Kinematics**

But isn't the bullet going up ? I'm so confused on how to write this with variables... So Dy = T x-9.8?
*November 8, 2013*

**Physics 12 Kinematics**

I have to do this with only variables...
*November 8, 2013*

**Physics 12 Kinematics**

I'm not really sure how to use the algebra to prove the monkey shouldn't have dropped. Obviously if the hunter aimed the gun directlt at the monkey it wouldn't hit it as gravity would pull it down. A huntsman fires a gun pointing at a monkey hanging on the branch ...
*November 8, 2013*

**math**

A group of students surveyed chose baseball and soccer as their favorite sports in a ratio of 3:8. a. If 132 students were surveyed, find the number of students that chose soccer as their favorite sport.
*November 5, 2013*

**math**

A group of students surveyed chose baseball and soccer as their favorite sports in a ratio of 3:8. a. If 132 students were surveyed, find the number of students that chose soccer as their favorite sport.
*November 5, 2013*

**LA High**

Find the total for the invoice below: Stock # Quantity Unit Description Unit Price Total 6729 20 ea. 15" Monitor $349.00 1259 22 ea. Cable 14.00 1152 25 ea. SCSI card 149.00 Invoice Subtotal Shipping Charges $580.00 Invoice Total
*October 13, 2013*

**gen.chememistry**

a students weighs 1o quaters and finds that their total mass is 56.63 grams . what should she report as the average mass of a quarter based on her data
*July 2, 2013*

**life orientation**

I'm asking for answers
*April 11, 2013*

**Math**

in a class of 30 students 20 played piano 17 played violin and 7 played both find the number of students who played violin only, piano only
*February 28, 2013*

**math**

Today Angela's cat's age in months is the same as Angela's age in years. In one year her cat's age in months will be 2 times Angela's age in years. Today Angela is ? years old.
*February 28, 2013*

**math**

if x A y means x + (X+1) + (x+2) + (x+3) +..., y times express 12 A 3 in simplest form
*February 28, 2013*

**Science**

Tranverse and longitudinal waves are mechanical waves what is meamt by these expression
*February 13, 2013*

**Math**

Proving identities: tell wether or not f(x)=sin x is an identity (Does it simplify to Sin x) ? Please help (sin^3x)(1+cot^2x)
*February 12, 2013*

**Math**

Find sec θ and csc θ. If tan θ =3 and cos θ>0. Please helpp, i don't get identities
*February 6, 2013*

**mathh**

the average of a set of six integers is 38. when a seventh number is included in the set, the average of the set increase to 47. what is the seventh number? helpppp
*February 5, 2013*

**math**

37 is what percent of 144, to the nearest percent? please helpp
*February 5, 2013*

**math**

the average (arithmetic mean) of a and b is 6 and the average of a, b, c is 11. What is the value of c?
*February 5, 2013*

**chem**

Oxygen gas and water are produced by the decomposition of hydrogen peroxide. If 10.0 mol of H2O2 decomposes, what volume of oxygen will be produced? Assume the density of oxygen is 1.429g/L. 2H2O2= 2H2O+O2
*February 3, 2013*

**Corporate Finance**

(1/1.65) x .13 + (.65/1.65) x .08 x .65 = .099273 = 9.93%
*November 10, 2012*

**algebra pre ap**

6x=7y=2 8x+5y=20
*October 2, 2012*

**math**

If R1 and R2 in series give a total resistance of 12,ohms,calculate R1 such that their combined resistance in parallel is a quarter of R1
*September 27, 2012*

**ap us history**

how much more was the conflict between great Britain and her North american colonies economic origin rather than rooted in political and social controversies and differences.
*September 19, 2012*

**ap us history**

thank you ms. sue
*September 19, 2012*

**Grade 12 life orientation**

describe the lifestyle diseases /behavious and explain 5 factors that contribute to the cancer
*April 19, 2012*

**physics**

A car weighing 1200kg was moving at a speed of 15m/s.breaks were applied and it stopped 6s latter.draw a graph showing the results
*April 17, 2012*

**math equation**

what is 15+26d=-8d
*February 17, 2012*

**alberga**

sixty is 5/6 of what number
*October 29, 2011*

**Chemistry**

Search: How much energy (in Kj) is relased when 25.0g of ethanol vapor at 93, is cooled to -10? Ethanol has a melting point of -114.5, bp of 78.4, specific heat= 2.10J/g, heat of fusion =4.60Kj/mol, specicic heat= 1.9j/g, heat of vaporization = 38.56Kj/mol
*September 27, 2011*

**Geography**

which of the 5 themes of geogrsphy do you think has had the most impact on history why
*September 7, 2011*

**PRECALCULUS**

An airplane is flying at a speed of 250 mph at an altitude of 4 miles. The plane passes directly above a radar station at time t=0. Find the distance s between the plane and the radar station after 5 minutes.
*May 27, 2011*

**Statistics**

For many years the top-selling luxury car in North America was the Cadillac. It reigned from 1950 to 1998. In 2000, Cadillac sales dropped to half of the sales in 1978. It appeared that it was only popular with older males. Younger males seeking luxury cars shopped elsewhere. ...
*April 5, 2011*

**Maths - check please**

Thank you Bob
*March 13, 2011*

**Maths - check please**

Fig.1. Shows a signwave on the its horizontal axis "Time in (ms)" means that time is measured in milliseconds. The time taken is 20 ms in total Question asks for frequency of the sinewave ? Cant really draw Fig.. here :-0( But the period is 5 milliseconds, the wave ...
*March 13, 2011*

**Chemistry**

13.1 + (19.32 - 8) = ? I know the answer is 24.42 but it says the answer has to be to the correct number of significant figures. so would that make it 24.5 or have I got that wrong
*March 6, 2011*

**Chemistry**

13.1 + (19.32 - 8) = ? I know the answer is 24.42 but it says the answer has to be to the correct number of significant figures. so would that make it 24.5 or have I got that wrong
*March 6, 2011*

**Chemistry**

13.1 + (19.32 - 8) = ? I know the answer is 24.42 but it says the answer has to be to the correct number of significant figures. so would that make it 24.5 or have I got that wrong
*March 6, 2011*

**Chemisty**

Thaks would you be able to show me an examples, as I still don't quite understand it. Sorry but this is my first time doing chemistry.
*March 6, 2011*

**Chemisty**

The Specific heat of a substance is the energy (joules) required to raise one gram of substance by one degree celsius (units J/g °C). Heating 225.0 cm3 of a solid from 36.1 °C to 74.3 °c takes 35850 J of energy. The density of the solid at 36.1 °C is 1.75 g/cm3...
*March 6, 2011*

**Chemistry**

Sorry didn't realise I was on answer ment to post as a new questions.
*March 6, 2011*

**Chemistry**

The Specific heat of a substance is the energy (joules) required to raise one gram of substance by one degree celsius (units J/g °C). Heating 225.0 cm3 of a solid from 36.1 °C to 74.3 °c takes 35850 J of energy. The density of the solid at 36.1 °C is 1.75 g/cm3...
*March 6, 2011*

**Chemistry**

Determine the density (in g/mL) of a liquid given: A beaker was weighed at 90. g, then 413.5mL of liquid was added and the new weight was 795 g.
*March 6, 2011*

**math**

hi to all of you teachers i hope you will help me to get the answers for this question below.. and thanks god bless you. Perk spent 1/4 of his money on a food and another 3/10 of his money on a drink. a. What fraction of his money did he spend in total? b. What fraction of ...
*February 13, 2011*

**math**

hi to all teacher who wants to help me for this word problem to get the answer and thanks a lot god bless u all. question below.. Perk spent 1/4 of his money on a food and another 3/10 of his money on a drink. a. What fraction of his money did he spend in total?
*February 13, 2011*

**math**

is anyone can answer this fraction below. .Rename these improper fractions as mixed numbers: 16/5 18/6 19/4 24/5 sorry if it is line suppose but i typed slash pls.understand thanks
*February 13, 2011*

**statistics 2**

A football team consists of 20 each freshmen and sophomores, 15 juniors and 10 seniors. Four players are selected at random to serve as captains. Find the probability that: a) all four are seniors b) There is one each: freshman, sophomore, junior and senior. c) There are 2 ...
*December 12, 2010*

**statistics**

The red face cards and the black cards numbered 2-9 are put into a bag. Four cards are drawn at random without replacement. Find the following probabilities: a) All 4 cards are red b) 2 cards are red and two cards are black c) At least one of the red cards is red. d) All four ...
*December 12, 2010*

**physics**

a man exerts 200 N force on a 18 kg lawnmower handle as he pushes it at constant velocity . the hantle makes an angle os 50 degrees with the ground.
*December 10, 2010*

**Physics**

Consider a bimetallic strip consisting of a 0.6-mm-thick brass upper strip welded to a 0.6-mm-thick steel lower strip. When the temperature of the bimetallic strip is increased by 83 K, the unattached tip deflects by 3 mm from its original straight position, as shown in the ...
*November 26, 2010*

**Physics**

Thanks Bob. However, I had already tried 1/2mv^2-GMm/R before posting this and it came back as wrong. I'm not sure why it is wrong.
*November 4, 2010*

**Physics**

A spaceship is launched from the Earth's surface with a speed v. The radius of the Earth is R. What will its speed be when it is very far from the Earth? (Use any variable or symbol stated above along with the following as necessary: G for the gravitational constant, m for...
*November 4, 2010*

**Physics**

Thanks...I figured out part b
*November 4, 2010*

**Physics**

Two identical 19.8-kg spheres of radius 12 cm are 29.2 cm apart (center-to-center distance). (a) If they are released from rest and allowed to fall toward one another, what is their speed when they first make contact? (b) If the spheres are initially at rest and just touching...
*November 4, 2010*

**Physics**

Two identical 21.2-kg spheres of radius 12 cm are 30.6 cm apart (center-to-center distance). (a) If they are released from rest and allowed to fall toward one another, what is their speed when they first make contact? (b) If the spheres are initially at rest and just touching...
*November 4, 2010*

**Physics**

I need to find the formula for the speed when the spaceship is very far from the earth.
*November 3, 2010*

** math**

no...divide 25 by .33 and you'll get 75.75757575 however, .333333333 is 1/3 and 25 is 1/3 of 75
*November 3, 2010*

** math**

54/.1 = 540
*November 3, 2010*

**Physics**

Two identical 21.6-kg spheres of radius 14 cm are 31.0 cm apart (center-to-center distance). (a) If they are released from rest and allowed to fall toward one another, what is their speed when they first make contact? (b) If the spheres are initially at rest and just touching...
*November 3, 2010*

**Angular Velocity Question**

I'm not getting the correct answer this way. Maybe I'm doing something wrong.
*October 25, 2010*

**Angular Velocity Question**

A disk with a mass of 18 kg, a diameter of 50 cm, and a thickness of 8 cm is mounted on a rough horizontal axle as shown on the left in the figure. (There is a friction force between the axle and the disk.) The disk is initially at rest. A constant force, F = 70 N,is applied ...
*October 25, 2010*

**Algebra**

59943.75
*May 7, 2010*

**math**

whom should you see at the bank if you need to borrow money?
*March 30, 2010*

**math**

Eighteen marbles are dropped into a jar. There are 8 black marbles, 7 red ones, and 3 silver ones. Marbles are taken from the jar without looking. Use this information to answer these two questions. 1. If one marble is taken, what is the probability of taking a marble that is ...
*March 9, 2010*

**Math**

if line m is parallel to line n and is cut by a transversal and angle 4 =3x - 20 and angle 5 = x + 40, what is the value of x?
*March 9, 2010*

**Math**

Hi. Im trying to figure out how to solve an equation for x. The equation is y=2(x-3)^2. If I were to work this out, I would have come up with the answer x=sqrt y/2 +3 but the answer is actually x=sqrt 2y/2 +3. I can't work out where the extra 2 has come from.
*November 20, 2009*

**math**

write two 2-digit numbers using each of the digits 1, 2, 3, and 4 only once. then find the sum of the numbers. what are the greatest and least possible sums that can be in made in this way? so far for my greatest, I have 41 and 32 = 73 and 14 and 23 = 37 for my lowest. can ...
*September 30, 2009*

**Math**

If A=35 and B=70, what is the ration of A to B and what is the percentage of A to B?
*September 28, 2009*

**Chemistry**

B. 11400 years
*April 4, 2009*

**Intro to Programming**

#include <...> // as needed using namespace std; int main() { float declare date types as needed; char done(‘n’); // this is used to terminate loop. char dummy; // See whether you understand why I use this below. cout << “Enter desired motor speed ...
*September 26, 2008*

**Intro to Programming**

. Step 4: Next, consider the change in voltage that would be required to obtain the desired motor speed. This can not be determined precisely at this time because the relationship S(V) between speed and voltage is non-linear. However, we might use the approximation which can ...
*September 26, 2008*

**Intro to Programming**

I have no clue what i am doing - any and all help would be appreciated - thanks! Finding an Input Giving a Desired Output PROBLEM BACKGROUND In many control problems, the output response of a system to an input is a non-linear function, that function perhaps being non-analytic...
*September 26, 2008*

**Vegetables**

Whats the difference between a vegetable and a fruit?
*September 22, 2008*

**math**

jennifer bought a brand new sports car. the price of the car was $14,900 including sports wheels, an AM/FM cd stereo, and automatic transmission. the dealer gave her a $1,250 instant rebate on the price and 0% interst for 60 months. jennifer made a down payment of $750. what ...
*May 13, 2008*

**math**

if 3x-1=11, what is the value of x 2 + x ?
*May 13, 2008*

**computrs**

a? device is a device that initiates an instruction to transmit data,instructions,or information.
*October 24, 2007*

**math**

eight-twentieths of ton is how many one hundredths of a ton?
*September 6, 2007*

**math**

-5y^3(y-6)+4y^3(y-7) OK - first, distribute -5y^3 to the (y-6). You should get -5y^4+30y^3. Do the same thing by distributing 4y^3 to the (y-7), leaving you with 4y^4-28y^3. Then combine the y^4 terms and the y^3 terms to get the answer of -y^4+2y^3.
*January 4, 2007*

**Math**

FIve years ago Zack would have been three times older than his young brother but five years from now he will only be two times older than his brother. How old is his brother? 25 In other words let x= brothers age so: 3(x-5)=2(x+5) Then 3x-15=2x+10 x=25 I thought it might help ...
*September 26, 2006*

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