Sunday

August 28, 2016
Total # Posts: 765

**Classical Mechanics - Need Help Please**

A block of mass m= 3 kg is initially at rest on a horizontal surface. At time t=0, we begin pushing on it with a horizontal force that varies with time as F(t)=βt2, where β= 1.2 N/s2. We stop pushing at time t1=5 s [F(t)=0 for t>t1]. (a) First, assume the surface ...
*December 8, 2013*

**Classical Mechanics Physics - Urgent help please**

Hey Damon, Part b and c: (b) What is the force exerted by the wall on the ruler when it is at an angle θ=30∘? Express your answer as the x component Fx and the y component Fy (in Newton) Fx= Fy= (c) At what angle θ0 will the falling ruler lose contact with the ...
*December 7, 2013*

**Math**

4x-3y=5 Solve { 5y+7=3x using the method of elimination.
*November 27, 2013*

**Math**

Determine the equation of g(x) that results from translating the function f(x) = x2 + 3 upward 14 units. g(x) = (x + 17)2 g(x) = (x + 14)2 + 3 g(x) = x2 - 11 g(x) = x2 + 17
*November 24, 2013*

**Finance**

I got 68016.92
*November 8, 2013*

**Math**

It's a NUMBER? It is divisible by 3 but not by 9 or 15. It is not an even number and it is less than 90. The sum of it is 12 and it could be the Product of 27..... What NUMBER??
*November 7, 2013*

**Science**

What is a substance that cannot be separated into simpler substances by physical or mechanical methods such as filtering, boiling, or sifting?
*October 25, 2013*

**physics**

(a) What is the escape speed on a spherical asteroid whose radius is 435 km and whose gravitational acceleration at the surface is 0.632 m/s2? (b) How far (in km) from the surface will a particle go if it leaves the asteroid's surface with a radial speed of 535 m/s? (c) ...
*October 4, 2013*

**physics**

(a) What is the escape speed on a spherical asteroid whose radius is 435 km and whose gravitational acceleration at the surface is 0.632 m/s2? (b) How far (in km) from the surface will a particle go if it leaves the asteroid's surface with a radial speed of 535 m/s? (c) ...
*October 4, 2013*

**MircoEcon**

Agree or disagree with this statements and explain: If the demand for a good has unitary elasticity, or elasticity is -1, it is always true that an increase in its price will lead to more revenues for sellers taken as a whole.
*September 30, 2013*

**trigonometry**

the bases of a trapezoid are 22 and 12 respectively. The angles at the extremities of one base are 65^ and 40^ respectively. Find the two legs
*September 1, 2013*

**Math**

If a car is traveling at 60 mph how long would it take to slow to 30 if slammed on the brakes?
*September 1, 2013*

**STATISTICS**

0.003
*August 6, 2013*

**statistics**

Archie must travel to a foreign country where a deadly strain of flu has ravaged the population. Already, 34% of the population has succumbed to the flu and died. There is a vaccine, but because the flu is extremely contagious, it spreads quite rapidly, and to date only 1 out ...
*August 2, 2013*

**bus 123**

Carol Miller went to Europe and forgot to pay her $850 mortgage payment on her New Hampshire ski house. For her 55 days overdue on her payment, the bank charged her a penalty of $26. (assume 360 days). What was the rate of interest charged by the bank?
*August 1, 2013*

**Science**

For example HNO2 + H20 ----> H30+ NO2- I don't understand how the hydronium ions form. How do I figure out if a OH- or H30+ will form from the reactant side.
*July 30, 2013*

**stats**

Cheating is not allowed. HRP258
*July 16, 2013*

**math**

a 5000lb. truck traveling at 30 miles per hr. hits a herd of horses bring the truck to a dead stop what is the force of impact?
*July 7, 2013*

**U.S. Government**

The social group that has the most influence on how you vote is in your --m---.
*June 27, 2013*

**calculus**

In 1970, the total enrollment in public universities and colleges in a country was 5.1 million students. By 2004, enrollment had risen to 14.3 million students. Assume enrollment can be modeled by exponential growth. (a) Estimate the total enrollments in 1980, 1990, and 2000...
*May 16, 2013*

**calculus**

In 1970, the total enrollment in public universities and colleges in a country was 5.1 million students. By 2004, enrollment had risen to 14.3 million students. Assume enrollment can be modeled by exponential growth. (a) Estimate the total enrollments in 1980, 1990, and 2000...
*May 16, 2013*

**calculus**

please help me Asap In 1970, the total enrollment in public universities and colleges in a country was 5.1 million students. By 2004, enrollment had risen to 14.3 million students. Assume enrollment can be modeled by exponential growth. (a) Estimate the total enrollments in ...
*May 16, 2013*

**Finance**

Calculate the future value of $5000 given that it will be held in the bank for 6 years and arn an annual interest rate of 7%.
*May 8, 2013*

**math**

first one answer: x^2+3x+2
*May 6, 2013*

**geometry**

What are the internal angles required to make a pentagon with 36 millimetre sides?
*May 5, 2013*

**geometry**

What are degrees of angles for pentagon with 36 sides
*May 5, 2013*

**physical aspects**

A 600 lb. oak packing crate is sitting on a cross grained, 14 ft long, oak ramp. The force of the box against the ramp is 520 lbs, and the downhill force on the box is 300 lbs. Will the box slide down the hill all by itself? Give the box a nudge, will it stop? If the box will ...
*May 5, 2013*

**Science-Greenhouse Effect**

idc I got a 8b so its very easy if u put ur head doen and listen to the teacher I'm in year 8
*April 23, 2013*

**Physics**

The cannonball is fired at a speed of 45 and an angle of 35 . A cannonball that was accidentally dropped from the top of the castle wall hit the moat below in 1.8 .
*April 20, 2013*

**Chemistry**

calculate the minimum number of grams of C3H8(g) that must be combusted to provide the energy necessary to convert 3.36 kg of H2O from its solid form at -10.0°C to its liquid form at 80.0°C
*April 15, 2013*

**Chemistry**

3.00 g of H2 reacts with 200.0 g of AgCl. what is the yield?
*April 15, 2013*

**LA**

so its C
*April 10, 2013*

**LA**

can you give me the right answer please
*April 10, 2013*

**LA**

What was the Supreme Court's ruling on the Dred Scott case? Dred Scott should be considered free since he had lived in many states where slavery was banned. Dred Scott could be free if he paid a fee. Dred Scott was still a slave and not a citizen. The case never reached ...
*April 10, 2013*

**Chemistry**

What mass of silver can be produced by reacting 0.300 L of 0.100 M AgNO3 with an excess of Mg?
*April 9, 2013*

**LA**

thanks
*April 8, 2013*

**LA**

What do you learn from the dialogue between Mr. Frank and Miep at the beginning of Scene 1? A;Miep wants to show Mr. Frank something in the building. B;Mr. Frank wants to live in this building to hold on to his memories. C;The war has ended, but Mr. Frank does not want to ...
*April 8, 2013*

**chemistry**

Sodium fluoride and lead nitrate are both soluble in water. If 1.13 g of NaF and 0.232 g of Pb(NO3)2 are dissolved in sufficient water to make 1.00 L of solution, will a precipitate form? How do you know if there should be a precipitate or not? What is the chemical formula for...
*April 7, 2013*

**science need help**

2 H2 + O2 = 2H2O 2 grams + 32 grams=_ _ _ _ _grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogeb that reacts. in your response be sure to: include they type of change illustrated in the balanced eqaution explain the conservation ...
*April 1, 2013*

**science need help**

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
*April 1, 2013*

**science**

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
*March 31, 2013*

**science**

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
*March 31, 2013*

**science**

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
*March 31, 2013*

**science**

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
*March 31, 2013*

**science**

when 1 gram of water evaporated the volume of the water vapor increases but the mass remains constant. why does the water remain constant i think because the number of atoms remain constant
*March 31, 2013*

**science**

why the tilt of axis causes summer to be warmer than winter in the northern hemisphere i put because the rays of the sun strike the northern hemisphere more directly in the summer. but it could also be because northern hemisphere is closer to the sun in the summer.
*March 31, 2013*

**Chemistry**

Consider the titration of 100.0 mL of 0.100 M H2NNH2 (Kb = 3.0 10-6) by 0.200 M HNO3. Calculate the pH of the resulting solution after the following volumes of HNO3 have been added. a)0.0 mL b)20.0 mL c)25.0 mL d)40.0 mL e)50.0 mL f)100.0 mL
*March 23, 2013*

**English**

What is Positive Adverbs
*March 22, 2013*

**math**

Combine the like terms (6a^4b - 6a^4b) + (ab^3 + 3ab^3) = 0a^4b + 4ab^3 = 4ab^3
*March 16, 2013*

**spanish**

what does ella mean
*March 11, 2013*

**physics**

A 36 cm long copper wire carries a current of 6.0 A and weighs 0.45 N. A certain magnetic field is strong enough to balance the force of gravity on the wire. What is the strength of the magnetic field?
*March 10, 2013*

**physics**

A wire that is 70 cm long, carrying a current of 6.5 A, is at right angles to a uniform magnetic field. The magnitude of the force acting on the wire is 0.60 N. What is the strength of the magnetic field?
*March 10, 2013*

**physics**

A wire that is 0.45 m long and carrying a current of 9.5 A is at right angles to a 0.40 T magnetic field. How strong is the force that acts on the wire?
*March 10, 2013*

**physics**

The force acting on a wire that is at right angles to a(n) 0.80 T magnetic field is 2.1 N. The current in the wire is 6.7 A. How long is the wire?
*March 10, 2013*

**physics**

A wire that is 630 m long is perpendicular to a 0.31 T magnetic field. A 1.8 N force acts on the wire. What current is in the wire?
*March 10, 2013*

**physics**

A wire that is 46 cm long is parallel to a 0.54 T uniform magnetic field. The current through the wire is 4.5 A. What force acts on the wire?
*March 10, 2013*

**math**

Solve equation for Y 2x + 8y = 6 8y = 6 - 2x y = 3/4 - x/4 Since this is a straight line, we can pick any value for X. Let's say X=2 Then y(2) = 3/4 - 2/4 = 1/4 Now, decrease x by 2, so x=0 y(0) = 3/4 - 0/4 = 3/4 The difference between Y(0) and Y(2) is 3/4 - 1/4 = 2/4 = 1/...
*February 26, 2013*

**MATH**

Change 1.9 hours into a form we can use. Let's break it into two parts. We know 1 hour is easy enough, and that will change the time to 4:05 PM (Subtract 1 hour from 5:05 PM). For the 0.9 hour part, let's change this to minutes. (0.9 hours)*(60 min / 1 hr) = 54 minutes...
*February 26, 2013*

**geometry**

Keep in mind it does not have to be in ratio of 3:4:5 to be a right triangle, it has to make the equation c^2=a^2+b^2 true. Another common right triangle is 5,12,13.
*February 26, 2013*

**geometry**

No...Use c^2=a^2+b^2. Use a= 24, b= 32 and c= 42 (the longest side). Take a^2 + b^2 and see if it eqauls c^2 If it does, it is a right angle. If it does not, it is not a right triange. In this case, it does not, so it is not a right triangle.
*February 26, 2013*

**Algebra**

2X + 1 r 2/(x-3)
*February 25, 2013*

**Algebra II**

1. Multiply out z^2 + 6z + 14z^2 + 84z + 45 = 0 2. Combine like terms 15z^2 + 90z + 45 = 0 3. Use quadratic equation to get both answers for z.
*February 24, 2013*

**chemistry**

A solution is prepared by mixing 50.7 mL of 0.28 M Pb(NO3)2 with 70.8 mL of 1.0 M KCl. Calculate the concentrations of Pb2+ and Cl - at equilibrium. Ksp for PbCl2(s) is 1.6 10-5.
*February 21, 2013*

**Math 10**

Yes, you are correct. Key word is circular, so we are talking about a circle. pi = circumference of a circle / diameter --> pi = C / d Solve for C C = pi*d = (3.14) *(10 ft) = 31.4 ft, assuming the approximation of 3.14 for pi.
*February 19, 2013*

**Math 9**

Think of a right triangle. The airport is the vertex of the right angle. Plane A is 70 miles north (Straight up). Plane B is 168 miles East (Straight right). From plane A to B would be side C of the right triange. C^2 = A^2 + B^2 C = sqrt (A^2 + B^2) C = sqrt (70^2 + 168^2) C...
*February 19, 2013*

**Math 5**

No, look at your answer... Your length is 4 times as long as your width... How did you come up with your answer?
*February 19, 2013*

**college algebra**

If X^2-5 is the denom, then the domain would be all X such that the denom does not equal 0. So find when x^2-5=0 x=sqrt(5) (Both positive and negative) So the domain is all real numbers, such that X does not equal +- sqrt (5)
*February 18, 2013*

**chemistry**

Just wanted to say thanx for the help Bob
*February 18, 2013*

**chemistry**

Greg reacts 5.0 moles of hydrochloric acid(HCL)with 1.5 moles of barium hydroxide(Ba(OH)2).Which reagent is the limiting reagent, and which is in excess?If the reagent runs to completion,how many moles of barium chloride(BaCl2)will be produced? CAN SOMEONE PLEASE HELP ME....
*February 18, 2013*

**Chemistry**

Robby if you need more help,type ur question ino the search bar on your computor and a site titled chap15 fd.valenciacollege.edu will come up and it will break down complete indtructions on how to go about figuring out this question.I hope this helps.
*February 18, 2013*

**math**

Convert the 9m of cloth to cm = 900 cm to start with. She has 90 cm of cloth left so she used 900 cm - 90 cm = 810 cm of cloth Let X = cloth for tablecloth Let 2X = cloth for each cushion cover. The equation would be: 810 = X + 4 * 2x 810 = X + 8X 810 = 9X X=90cm 2X=2(90cm) = ...
*February 18, 2013*

**math**

$38.40 = (1-0.40)* Price Price = $38.40 = $64.00 ------- 0.6
*February 18, 2013*

**math**

BAD is correct. It is 84. If you would like to use algebra, do the following: x:= Unit Digit Number y:= Tens Digit Number The units digit is 4 less than the tens digit number so We know that x=y-4 The tens digit is twice the units digit so we know that y=2x Now we can take the...
*February 18, 2013*

**Algebra**

BTW Cassie, please please always remember that pi is simply a circle's circumference divided by it's diameter. For every circle, no matter the size... This is why it shows up in so many formulas for circles, cylinders, cones, etc.
*February 18, 2013*

**Algebra**

Reiny, Agreed, but that is what it appears to be using. I am guessing it was a software program and not the actual computer using that approximation. What really irks me about pi is that most people know it is 3.1415....., but have NO idea what it actually represents....
*February 18, 2013*

**Algebra**

You did the problem correctly. I am not sure how exactly you entered the numbers into the computer for pi, but it looks like with an answer of 24,523.71 the computer used an approzimation for pi based on the fraction 22/7. 22/7 = 3.142857.... If you plug the 22/7 instead of 3....
*February 18, 2013*

**Algebra**

The answer would then be C. 160 cm^3 The Volume of a cone is given by V=(1/3)*pi*r^2*h We know V= 540 cm^3 and that r=15 cm and can plug into the equation to find h. I am going to leave the units off, but you should include it in your work. 540=(1/3)*pi*(15)^2*h Solving for h ...
*February 17, 2013*

**Algebra**

Could Answer c be 160 cm^3 and not 16 cm^3?
*February 17, 2013*

**math**

She could actualy do it several different combinations. 5 quarters, 1 dime, and 10 nickels 4 quarters, 5 dimes, and 7 nickels 3 quarters, 9 dimes, and 4 nickels 2 quarters, 13 dimes, and 1 nickel
*February 17, 2013*

**Math - Please Help**

We know the formula for the Volume of a Right Circular Cone is given by V=(1/3)*pi*r^2*h V=140 in^3 The height of the cone = diameter of the base. The diameter = 2 times the radius, so h = 2r The formula for Volume can now be written as V=(1/3)*pi*r^2*(2r) which simplifies to ...
*February 17, 2013*

**math**

Sharon swims 1/4 of the total route Swim = (1/4)*TotRoute Sharon cycles 3/5 of the remaining route Cycles = (3/5)*(3/4)*TotRoute Notice the 3/4. If she swam 1/4 of the total route, 3/4 of the route remains for cycling and running. Sharon runs rest of the route Runs = (2/5)*(3/...
*February 17, 2013*

**Lang. Arts**

What do you learn from the dialogue between Mr. Frank and Miep at the beginning of Scene 1? A;Miep wants to show Mr. Frank something in the building. B;Mr. Frank wants to live in this building to hold on to his memories. C;The war has ended, but Mr. Frank does not want to ...
*February 11, 2013*

**Physics**

Dave your dealing with Circular motion so you would use this circular motion formula;Ac=Vc2/r 1. In your problem your trying to find the radius. 2. The Ac is already given, but since the problem asks for it not to exceed 6.15 times the free-fall acceleration. You must times ...
*February 8, 2013*

**7th grade health please help Ms. Sue!**

sue Ms. Sue!!!!!!!!!!!!!!! :)
*February 6, 2013*

**MATH**

The unit's digit for the number 7^76 is____ ?
*January 17, 2013*

**7th grade science ms sue please**

Lauren, please refrain from making fool out of yourself. A sex cell has 23 chromosomes.
*January 16, 2013*

**math**

Aliquot divisors are all the divisors of a number except the number itself. The product of the Aliquot divisors of a number is somtimes equal to the square of the number. The Aliquot divisors of of 12 are 1 ,2 ,3 ,4 ,6. Their product,1x2x3x4x6=144=12*2 is the smallest number ...
*January 16, 2013*

**math**

Since it's just a line, make an x y table of values, plot the points, and connect them with a line. Or you could use transformation rules by moving around the graph of y=x.
*December 5, 2012*

**Science**

If this is a physics question it might be that you should lose mass. Weight can change with location (weight is just the measure of gravity's pull) but mass does not.
*December 5, 2012*

**Computers**

Develop a use case diagram for a department store credit card system. Include at least two actors and four use cases.
*December 2, 2012*

**physics**

883N
*November 25, 2012*

**Physics**

A force of 44.0 N accelerates a 5.0-kg block at 6.3 m/s2 along a horizontal surface. (a) How large is the frictional force? (b) What is the coefficient of friction?
*November 17, 2012*

**4th grade math round off 4,489 to the nearest thousand**

4,500
*November 15, 2012*

**physics**

Storms in the South Pacific can create waves that travel all the way to the California coast, which are 12,000 km away. How long does it take them if they travel at 15.0 m/s?
*November 13, 2012*

**physics**

It changed my theta sign to the è. But those are supposed to be theta.
*November 10, 2012*

**physics**

Consider the 620 N weight held by two cables shown below. The left-handed cable had tension 550 N and makes an angle of è with the wall. The right-hand cable had tension 670 N and makes an angle of è1 with the ceiling. a.) What is the ...
*November 10, 2012*

**physics**

A 0.500 kg is thrown vertically upward from the ground with an initial speed of 12.0 m/s. Define the initial potential energy to be zero on the ground. What are the potential energy and kinetic energy of the ball at 2.50m above the initial position?
*November 8, 2012*

**Physics**

Two acrobats, each of 60.0 kg, launch themselves together from a swing holdings hands. Their velocity at launch was 8.00 m/s and the angle of their initial velocity relative to the horizontal was 46.0 degrees upwards. At the top of their trajectory, their act calls for them to...
*October 26, 2012*

**Physics**

The solid fuel of a 300.kg rocket travelling at 1.64x104 km/h is ignited to correct the rocket trajectory in mid-flight to Mars. 10.00 kg of fuel is burnt in 15.00 s. If the exhaust velocity of the fuel, relative to the rocket, is 2.90x103 km/h, what is the acceleration of the...
*October 26, 2012*

**Physics**

A ballistic pendulum was a device used in the past century to measure the speed of bullets. The pendulum consists of a large block of wood suspended from long wires. Initially, the pendulum is at rest. The bullet strikes the block horizontally and remains stuck in it. The ...
*October 26, 2012*