Sunday

April 20, 2014

April 20, 2014

Number of results: 103,983

**IWU**

Take two groups of 13 coins, and one left over. If the two groups are equal, the one is counterfit. If the two groups are not equal, take the light weight group, divide it into two groups of six. Balance them, and if equal, it is the one left over. If they are unequal, choose ...
*Tuesday, September 24, 2013 at 3:56pm by bobpursley*

**Physics**

Actually, the solution will involve the G constant. You will have to use it to compute the mass, unless you use Kepler's third law in a different form the involves the sum of the masses of the two objects, in terms of solar mass. "G" is already "built in" to that solution ...
*Saturday, June 25, 2011 at 11:11pm by drwls*

**Math**

two sides of a triangle are equal. The third side is 3 less than the sum of the two equal sides. The perimeter is 31 inches. Find the length of each side
*Friday, December 10, 2010 at 4:24pm by Allen*

**geometry**

The two halves of the triangle are congruent. (Proof: SAS. Side, bisected half angle A/2 and common side are equal) Therefore the two lengths BD and DB are equal and BC is bisected.
*Wednesday, September 21, 2011 at 5:58am by drwls*

**Math**

I have two problemson polygonal convex sets which I do not understand. The first: Find the minimum value of f(x,y) = 2x-y+2 for the polygonal convex set determined by this system of inequalities: x is more than or equal to 1 x is less than or equal to 3 y is more than or ...
*Tuesday, January 20, 2009 at 8:41pm by Joanie*

**PHYSICS _ please help**

You know the increase in the balance is equal to bouyancy, or 1.8kg but bouyancy is equal to the density of the liquid*volume displaced, so set them equal, and I think the density then must be equal to 1.8kg/1000cm^3, that converts to one of the answers. in the last part, you ...
*Tuesday, August 9, 2011 at 10:20pm by bobpursley*

**Chemistry**

How would you set up for the percent? %Cl = [(Mass AgCl ppt)*(1 mol AgCl/molar mass AgCl)*(atomic mass Cl^-/1 mol Cl^-)/mass sample]*100 = ?? Now you want mass ppt to equal %Cl. It looks confusing on the board but write it out on a sheet of paper and you will see it. Solve the...
*Thursday, April 23, 2009 at 12:31am by DrBob222*

**Physics Classical Mechanics**

mv=(2m)u u=v/2 KE(of two carts) =(2m)u²/2=mv²/4 =0.5(mv²/2) =0.5KE(cart A) Ans 1)
*Monday, October 28, 2013 at 6:13am by Elena*

**physics**

truck A of mass 2,5 x 10(4) kg approaches a second truck B of mass 2 x 10(4) kg with a velocity of 12 m.s -1 and collides with it. After collision the two trucks move apart with equal but opposite momenta. Calculate what the velocity of B was before the collision
*Thursday, February 10, 2011 at 2:12pm by Claudia*

**PHYSICAL SCIENCE**

IN A BALANCED CHEMICAL EQUATION,THE MASS OF THE REACTANTS IS EQUAL TO A.ATOMS IN A MOLECULE B.ATOMIC MASS OF THE ELEMENTS C.VOLUME OF THE PRODUCTS D.MASS OF THE PRODUCTS
*Monday, January 14, 2008 at 3:11am by KRYSTAL*

**physical science**

in a balanced chemical equation the mass of the reactants is equal to the? a. atoms in a molecule b. atomic mass of the elements c. volume of the reactants d. mass of the products
*Friday, March 25, 2011 at 7:57pm by sarah*

**physics**

A hydraulic lift has two connected pistons with cross-sectional areas 5 cm2 and 350 cm2. It is filled with oil of density 740 kg/m3. a) What mass must be placed on the small piston to support a car of mass 1400 kg at equal fluid levels? 20 OK HELP: The pressure is constant at ...
*Sunday, November 7, 2010 at 8:12pm by Taylor*

**physics**

What is the acceleration of two falling sky divers (mass 107.0 kg including parachute) when the upward force of air resistance is equal to one-fourth of their weight?
*Tuesday, March 8, 2011 at 5:02pm by Anonymous*

**Discreet Mathematical Structures**

Use proof by contraposition to prove the following statement: If A is the average of two positive real numbers then one of the two numbers is greater than or equal to A. Proof. Domain: positive real numbers P: A=(x+y)/2 Q: x is greater than or equal to A or y is greater than ...
*Thursday, October 7, 2010 at 9:56pm by Anna*

**Physics**

Two carts, one twice as heavy as the other, are at rest on a horizontal frictionless track. A person pushes each cart with the same force for 6.00 s. If the kinetic energy of the lighter cart after the push is K, the kinetic energy of the heavier cart is A. 1/4 K B. 1/2 K C. K...
*Saturday, March 5, 2011 at 6:18pm by Joe *

**physics**

Two carts, one twice as heavy as the other, are at rest on a horizontal frictionless track. A person pushes each cart with the same force for 4.00 s. If the magnitude of the momentum of the lighter cart after the push is P, the magnitude of the momentum of the heavier cart is ...
*Saturday, March 5, 2011 at 6:19pm by Joe *

**physics**

Two carts, one twice as heavy as the other, are at rest on a horizontal frictionless track. A person pushes each cart with the same force for 4.00 s. If the magnitude of the momentum of the lighter cart after the push is P, the magnitude of the momentum of the heavier cart is ...
*Sunday, March 6, 2011 at 11:37am by Ana*

**physics**

Two carts, one twice as heavy as the other, are at rest on a horizontal frictionless track. A person pushes each cart with the same force for 6.00 s. If the kinetic energy of the lighter cart after the push is K, the kinetic energy of the heavier cart is A. 1/4 K B. 1/2 K C. K...
*Sunday, March 6, 2011 at 11:37am by Ana*

**physics**

Two wires are anchored at both ends. Wire 1 has a mass of 105 grams and a length of 6.9 m. Wire 2 has a mass of 60 grams, a length of 20 m, and a tension of 143 N. What must be the tension in Wire 1 if its third harmonic is to equal the first overtone of Wire 2? T_{wire1} =
*Monday, April 14, 2014 at 5:20pm by johnny*

**chemistry**

Find the total molecular mass of it one Al, one K, two S, eight O, and one H2O divide that sum (the mole mass) into the mass of two SO4 ions.
*Monday, October 11, 2010 at 4:14pm by bobpursley*

**physics**

A) With F=ma you get m=F/a. If F is a constant then; when mass increases the acceleration decreases and vice-versa (it's reversely proportional). So the Mini Cooper with lower mass has a greater acceleration. B) With the above conclusion it is sensible that the Hummer takes a ...
*Wednesday, February 15, 2012 at 5:39pm by Imalka*

**Physics**

Two stars in a binary system orbit around their center of mass. The centers of the two stars are 7.40 1011 m apart. The larger of the two stars has a mass of 3.40 1030 kg, and its center is 2.50 1011 m from the system's center of mass. What is the mass of the smaller star?
*Tuesday, March 13, 2012 at 3:26pm by Natasha*

**physics**

If in the same direction, thurust is T, and if at ninety degrees, thrust is .707T. distance=at, distance=Force/mass* t time=distance*mass/Force Case 1: Force=1 unit, time is 17 seconds distance*mass=time*force=17*1 Case 2: force=.707, time is ? distance*mass=time*.707 because ...
*Sunday, September 15, 2013 at 9:56pm by bobpursley*

**math-not clear**

The problem is not clear, with two equal signs. If the last equal sign is to be ignored, you have -7.4 = -3.7 + x Add 3.7 to both sides of the equal sign to get 3.7 - 7.4 = 3.7 - 3.7 + x -3.7 = x x = -3.7
*Thursday, November 11, 2010 at 3:10pm by MathMate*

**science**

Let X = mass NaCl and let Y = mass NaBr two equation in two unknowns. ---------------------- X + Y = 2.10g X(atomic mass Na/molar mass NaCl) + Y(atomic mass Na/molar mass NaBr) = 0.71g Solve for X and Y.
*Saturday, July 28, 2012 at 2:00pm by DrBob222*

**TO BOBPURSLEY**

ok net force = m a only force present force of gravity Fg = mg = r^-2 G m M were m is the mass of the moon and the M is the mass of what ever it's orbiting... correct? Fg = mg = r^-2 G m M divide both sides by the mass of the moon g = r^-2 G M so I guess I just don't get it ...
*Saturday, September 12, 2009 at 5:03pm by QUESTION*

**Physics**

This not about physics. Use graph paper or an straight-edge with a right angle corner to draw two lines at right angles meeting at a point. Make the two lines of equal length. Draw the hypotentuse between the other two ends of the lines. If you choose a scale that calls the ...
*Friday, February 19, 2010 at 10:40pm by drwls*

**Physics**

Car 1 has a mass of m1 = 65 103 kg and moves at a velocity of v01 = +0.78 m/s. Car 2, with a mass of m2 = 92 103 kg and a velocity of v02 = +1.4 m/s, overtakes car 1 and couples to it. Neglect the effects of friction in your answer. (a) Determine the velocity of their center ...
*Wednesday, November 9, 2011 at 10:54pm by Taylor*

**physics**

Relative to a situation where the masses are widely separated, the potential energy of the equilateral configuration will be negative. That is because it will require work to separate them. A single mass m has no potential associated with it. When you add a second mass m at ...
*Friday, March 11, 2011 at 7:35pm by drwls *

**Chem**

Is this on the right track?.....mass cannot be created/destroyed, although it may be rearranged in space, and changed into different types of particles. This implies that for any chemical process in a closed system, the mass of the reactants must equal the mass of the products.
*Tuesday, October 5, 2010 at 6:39pm by Josh*

**Physics**

Car 1 has a mass of m1 = 65 103 kg and moves at a velocity of v01 = +0.76 m/s. Car 2, with a mass of m2 = 92 103 kg and a velocity of v02 = +1.5 m/s, overtakes car 1 and couples to it. Neglect the effects of friction in your answer. (a) Determine the velocity of their center ...
*Tuesday, July 10, 2012 at 3:07pm by Emily*

**Physics**

b. both carts have the same velocity. Just did on MP
*Sunday, March 6, 2011 at 11:19am by Atik*

**5th grade algebra**

you multiple the 1/2 by two to have a common denominator of 4 making the problem 3/4+ 2/4 which is equal to 5/4. now 5/4 is supposed to be equal to 11/y so you cross multiply (5 * y) = (11 *4). this gives you 5y = 44 so divide by 5 and 5 is equal to 44/5
*Tuesday, May 11, 2010 at 8:06pm by Evan*

**Physics**

Two stars in a binary system orbit around their center of mass. The centers of the two stars are 7.80 x 10^11 m apart. The larger of the two stars has a mass of 3.50 x 10^30 kg, and its center is 3.00 x 10^11 m from the system's center of mass. What is the mass of the smaller ...
*Monday, October 24, 2011 at 4:40pm by Anne*

**chem**

The mass of reactants equals the mass of products. Actually, there is a very small difference, almost too small to measure, due to the theory or relativity. There IS a mass loss equal to the energy release divided by c^2.
*Wednesday, March 12, 2008 at 6:31pm by drwls*

**Math**

If two set are equal are they necessarily equal? I say no but I am really not sure. Thanks.
*Thursday, June 4, 2009 at 9:30am by B.B.*

**Geometry...HELP**

In a rectangle diagonals are equal Set the two equal to each other and solve
*Friday, December 14, 2012 at 6:51pm by Mac*

**Math**

My question is this: If two sets are equal does that mean that they are necessarily equal?
*Thursday, June 4, 2009 at 10:24am by B.B.*

**physics**

If two particles have equal kinetic energies, are their momenta necessarily equal?
*Thursday, November 8, 2007 at 12:44am by Anonymous*

**algebra**

Set the two equations equal, (both are equal to the same thing, y), and solve for x.
*Wednesday, January 23, 2008 at 8:48pm by bobpursley*

**science**

two equal forces have their resultant equal to either.what is the inclination between them?
*Thursday, June 28, 2012 at 10:05am by nt531*

**Physics - KE/Inertia**

The rigid body shown in Figure 10-66 (it is a triangle with the upper mass = to M and the bottom two corners/masses equal to 2M. The bottom side length equals .70 cm with point P in the middle of the side and the other two sides equal .55 cm)consists of three particles ...
*Monday, March 26, 2007 at 2:57pm by COFFEE*

**physics**

the gravitational force between M and the third mass must equal the force between the third mass and 3M. First we need to set up some facts: M = the first mass, and the third small mass 3M = the larger mass *Note that the masses are largely arbitrary as they will cancel out, ...
*Sunday, October 18, 2009 at 9:21pm by Tibs*

**Calculus**

Two particles move along the x -axis. For 0 is less than or equal to t is less than or equal to 6, the position of particle P at time t is given by p(t)=2cos((pi/4)t), while the position of particle R at time t is given by r(t)=t^3 -6t^2 +9t+3. 1. For 0 is less than or equal ...
*Wednesday, December 19, 2012 at 11:52am by Madeline*

**Calculus**

Two particles move along the x -axis. For 0 is less than or equal to t is less than or equal to 6, the position of particle P at time t is given by p(t)=2cos((pi/4)t), while the position of particle R at time t is given by r(t)=t^3 -6t^2 +9t+3. 1. For 0 is less than or equal ...
*Wednesday, December 19, 2012 at 5:29pm by Madeline*

**Calculus**

Two particles move along the x -axis. For 0 is less than or equal to t is less than or equal to 6, the position of particle P at time t is given by p(t)=2cos((pi/4)t), while the position of particle R at time t is given by r(t)=t^3 -6t^2 +9t+3. 1. For 0 is less than or equal ...
*Wednesday, December 19, 2012 at 9:38pm by Madeline*

**Math-Algebra**

1. Finf the width of a rectangle whose area is 36 sq in. And length is 9in. 2. The attraction F of any two masses m1 and m2 foe each other varies directly as the oroduct of the masses and inversely as the square of the distance d between these teo masses. Express the relation ...
*Sunday, November 24, 2013 at 11:12pm by Mckenna Louise*

**Physics**

For a winter fair, some students decide to build 30.0- kg wooden pull-carts on sled skids. If two 90.0- kg passengers get in, how much force will the puller have to exert to move the pull-cart? The coefficent of maximum static friction between the cart and the snow is 0.15.
*Tuesday, October 27, 2009 at 7:07am by Tony*

**chemistry**

Two equations in two unknowns; solve simultaneously. Let X = mass CaCO3 Let Y = mass MgCO3 ====================== X + Y = 7.85 grams. X(moles mass CO2/molar mass CaCO3) + Y(molar mass CO2/molar mass MgCO3) = grams CO2. [Note: YOu will need to use PV = nRT to calculate moles ...
*Sunday, October 17, 2010 at 2:39pm by DrBob222*

**ALGEBRA**

imma teach you how i learn to factor tak the x^2 and multiply it with the 20 giving you 20x^2 now figure out all the numbers that multiply to equal 20 which should be 4 and 4, and 1 and 20 now out of those 2 choices which one adds up to equal 9 (bc there is a 9x) the answer is...
*Monday, April 30, 2012 at 10:10am by visoth*

**Physics**

Car 1 has a mass of m1 = 65 multiplied by 103 kg and moves at a velocity of v01 = +0.95 m/s. Car 2, with a mass of m2 = 92 multiplied by 103 kg and a velocity of v02 = +1.1 m/s, overtakes car 1 and couples to it. Neglect the effects of friction in your answer. (a) Determine ...
*Tuesday, February 22, 2011 at 10:10pm by Lauren*

**Physics**

A loudspeaker of mass 20.0kg is suspended a distance of h = 1.60m below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 4.00m .
*Monday, September 30, 2013 at 2:29pm by Anonymous*

**geometry**

Two sides of a triangle are equal. The third side is 5 inches longer than the one with equal sides. What is the length of the equal sides if the perimeter is 32 inches?
*Wednesday, September 21, 2011 at 11:28pm by Ck*

**physics**

A newly-discovered plant, "Cosmo", has a mass that is 4 times the mass of the Earth. The radius of the Earth is Re. The gravitational field strength at the surface of Cosmo is equal to that at the surface of the Earth if the radius of Cosmo is equal to... I guess I need some ...
*Saturday, January 19, 2008 at 10:35pm by Hannah*

**physics!!**

The two masses (m1 = 4.96 kg and m2 = 2.90 kg) in the Atwood's machine shown in the figure below are released from rest, with m1 at a height of 0.800 m above the floor. When m1 hits the ground its speed is 0.203 m/s. Assuming that the pulley is a uniform disk with a radius of ...
*Sunday, October 21, 2012 at 7:24pm by Emily *

**physics **

b? Hmmmm. acceleration= force/mass, and that is equal to kx/mass so acceration depends on x
*Saturday, February 26, 2011 at 7:39pm by bobpursley*

**physic**

Two equal masses are attached to separate identical springs next to one another. One mass is pulled so its spring stretches 20 cm and the other is pulled so its spring stretches only 10 cm. The masses are released simultaneously.Which mass reaches the equilibrium point first?
*Monday, December 13, 2010 at 8:26am by leya*

**Physics**

Hmmmmmmm The student's weight is equal to the summation of the two reactions or 394N which is equal to 40.2 kg force.
*Friday, March 4, 2011 at 5:31pm by tchrwill*

**physics**

TWO EQUAL FORCES HAVE A RESULTANT EQUAL TO 1 1/2 TIMES THE EITHER FORCE . AT WHAT ANGLE THEY ARE INCLINED TO EACH OTHER
*Tuesday, October 11, 2011 at 2:55am by PRIYANSHU*

**geometry**

The "legs" of an isosecles triangle are the two sides with equal length. Set them equal and solve for x. 2x + 5 = 3x - 1 x = 6
*Tuesday, October 25, 2011 at 8:35pm by drwls*

**science**

The displaced water is 25ml, or 25grams. That has to equal the mass of the object. density=mass/volume
*Thursday, July 1, 2010 at 10:17am by bobpursley*

**Physics **

Subtract from the "normal" value of g the acceleration in the opposite direction due to a hypothetical sphere of negative mass equal to the difference between the mass of earth's crust and the same volume full of oil. This reduction in g will be equal to a = G (Mcrust-Moil)/(0...
*Monday, April 5, 2010 at 11:04pm by drwls*

**gr10 science**

The mass of reactants is equal to the mass of the products.
*Monday, April 25, 2011 at 8:02pm by bobpursley*

**math**

two equal sides of an isoscles triangle with fixed based 'a' are decreasing at the rate of 9cm/second how fast is the area of triangle decreasing when the two sides are equal to 'a'
*Monday, April 1, 2013 at 1:40pm by shweta*

**Physics**

two point masses are located in the same plane. the distance from mass 1 to the center of mass is 3.0m. The distance from mass 2 to the center of mass is 1.0m. What is m1/m2, the ratio of mass 1 to mass 2?
*Tuesday, March 29, 2011 at 5:02pm by Jacob*

**Chemistry**

Look up the mass for each of these elements on a periodic table. Mass of Carbon + two times the mass of sulfur. 6 times the mass of Carbon + 12 times the mass of Hydrogen + 6 times the mass of oxygen.
*Monday, March 4, 2013 at 4:35pm by Dr. Jane*

**physics**

how far apatr should two electrons be if the electric force each exerts on the other is equal to the weight of an electron ? ( take the mass of an electron to be Me = 9.11 x 10-31 kg ).
*Friday, November 26, 2010 at 6:21am by hashi*

**physics**

A light string has its ends tied to two walls separated by a distance equal to five-eighths the length of the string. A 53 kg mass is suspended from the center of the string, applying a tension in the string. What is the tension in the two strings of length L/2 tied to the ...
*Monday, April 5, 2010 at 10:09am by pop*

**physics**

A light string has its ends tied to two walls separated by a distance equal to five-eighths the length of the string. A 53 kg mass is suspended from the center of the string, applying a tension in the string. What is the tension in the two strings of length L/2 tied to the ...
*Monday, April 5, 2010 at 10:09am by pop*

**college physics**

two balls of equal mass,moving with speeds of 5 meter/seconds,collide head on.find the velocity of each after impact if (a)they are stuck together (b)the collision of perfectly elastic. (c)the coefficient of restitution in 1/3?
*Wednesday, March 9, 2011 at 5:02am by Jeff Rey*

**physics**

first figure the horizontal force. forceh=45*cos37 that has to equal mass*a solve for mass.
*Sunday, February 13, 2011 at 9:59pm by bobpursley*

**physical science**

The atomic mass unit is 1/12 the mass of carbon-12. Subatomic particles have nothing to do with it. Some myths float around that says the mass of the proton or neutron is equal to one amu, but that is most wrong.
*Sunday, November 4, 2007 at 9:04pm by bobpursley*

**Physics**

Assuming I did it correctly: F=ma mass = the mass of the electron = 9.11 * 10^-31 kg a= 115 m/s plug in your known variables F will equal 1.05 * 10^-28 Newtons (N) Next, F=qE q equals the charge of the electron, or "point charge". q=1.6 * 10^-19 C Solve for E, so E=F/q plug in...
*Monday, March 1, 2010 at 8:02pm by Jason*

**geometry**

The perimeter of a triangle is equal to 12 inches. The length of the longest side is equal to the sum of the other two sides minus 2. If you add 2 to the shortest side, it will equal the longest side. Find the side lengths.
*Thursday, October 28, 2010 at 8:54pm by ken*

**Chemistry**

Two equations in two unknowns; solve simultaneously. Let X = mass NaCl and Y = mass K2SO4 ------------------- eqn 1 is X + Y = 10.0 eqn 2 is mass PbCl2 (from NaCl) + mass PbSO4(from K2SO4) = 21.75g. eqn 2 in terms of X and Y is this (X*MMPbCl2/2*MMNaCl) + (Y*MMPbSO4/MMK2SO4...
*Tuesday, March 18, 2014 at 10:21am by DrBob222*

**chemistry**

You have many typos in the problem. Here is the solution with the typos corrected. Let x = mass NaHCO3 and y = mass of the impurity. --------------------- x + y = 0.682 x(molar mass Na2CO3/2*molar mass NaHCO3) + y = 0.467 --------------------- The above two equations in two ...
*Friday, November 23, 2012 at 2:41pm by DrBob222*

**Physics**

friction between the crates and floor Force= mu*mass*g But that must equal ma, or m (v^2/(2d)) mu*mass*g= mass*v^2/2d and you are looking for d.
*Friday, November 30, 2007 at 4:09pm by bobpursley*

**Physical Science **

Two identical beakers are both half filled with a liquid. Beaker A contains water and Beaker B contains a liquid that is denser than water. Which of the following is FALSE? a. The pressure at the bottom of Beaker B is greater than that at the bottom of Beaker A. b. The ...
*Tuesday, March 20, 2012 at 9:02pm by Ariel*

**math(geometry)**

all sides of a square are equal. So set the two measurements equal to each other in an equation. 1/2(14x + 8) = 6x + 8 You will get x=4 as your answer.
*Sunday, September 23, 2007 at 6:48pm by Jen*

**Gen physics**

Two balls are approaching each other head-on. Their velocities are +11.9 and -10.5 m/s. Determine the velocity of the center of mass of the two balls if (a) they have the same mass and (b) if the mass of one ball (v = 11.9 m/s) is twice the mass of the other ball (v = -10.5 m/...
*Monday, July 22, 2013 at 5:52pm by ODU*

**Physics**

Two objects x and y with a total mass od 2.5 x 10^3 kg are joined together in outer space and are at rest. An astronaut in a space shuttle presses a button that is explosive and seperates the two objects from each other. X moves to the right with a velocity of 4.8 m/s and Y ...
*Monday, August 8, 2011 at 7:19pm by Xanther*

**physics**

two particle with equal mass, one carrying a charge q and the other -2q each enter at right angles to a uniform magnetic field with the same velocity. which is deflected into a circular path with the larger radius?
*Saturday, March 10, 2012 at 2:34pm by fatih*

**Applied maths-mechanics**

A block of mass 300kg is just pulled along rough horizontal ground by two equal force inclined at 30 degrees to the line of motion.if the coefficient of friction is 0.6.find the value of P
*Monday, March 25, 2013 at 7:26am by Mathapelo*

**physics**

Two blocks are connected by a lightweight, flexible cord that passes over a frictionless pulley. If mass one equals 3.6 Kg and mass two equals 9.2 Kg, and block two is initially at rest 140 cm above the floor, how Long does it take block two to reach the floor?
*Thursday, September 20, 2012 at 11:49pm by Anonymous*

**physics**

Two balls are approaching each other head-on. Their velocities are +11.9 and -10.5 m/s. Determine the velocity of the center of mass of the two balls if (a) they have the same mass and (b) if the mass of one ball (v = 11.9 m/s) is twice the mass of the other ball (v = -10.5 m...
*Thursday, July 25, 2013 at 6:35pm by tcc*

**physics**

To do this problem, you need to know where the two supports are located. Is one of them at the extreme opposite end of the board from where the person is standing? Write two equations for the force exerted by the two supports. One of them is a force balance: F1 + F2 = (Mb + Mp...
*Sunday, November 4, 2007 at 11:55pm by drwls*

**physics**

Use ^ in front of exponents please. Express the galactic mass in terms of the number of equal-size stars, N. Set the centripetal force equal to the gravitational frce on the edge star, and sziolve for N.
*Friday, July 16, 2010 at 7:26pm by drwls*

**Physics**

Two balls are approaching each other head-on. Their velocities are +10.00 and -12.8 m/s. (a) Determine the velocity of the center of mass of the two balls if they have the same mass. m/s (b) Determine the velocity of the center of mass of the two balls if the mass of one ball...
*Sunday, November 2, 2008 at 9:43pm by Brandon*

**Physic**

Two charges of equal magnitude of 2C and mass of 1.0 g are separated by a distance of 3 mm. Find the velocity of one particle when they are separated by a distance of 4mm.
*Tuesday, January 31, 2012 at 7:08pm by Catherine*

**Physics**

a) buoyant force equal total mass, assuming the boat floats. b) From Archimedes principle, the total mass equals the mass of liquid displaced by the boat, so if h=height immersed, then 2*3*h*1000 kg = 4500 kg. Solve for h, and then subtract from 2 m to get the height out of ...
*Thursday, July 25, 2013 at 9:33pm by MathMate*

**Algebra**

for two complex numbers to be equal, the real and imaginary parts must be equal. So, we need -2x-1 = 4x 2y = -5 That should help, eh?
*Wednesday, October 23, 2013 at 5:59pm by Steve*

**Physics**

"Two masses, 2000kg and 5000kg, are placed 20m apart. A third mass of 5000kg is placed in between the two large masses a distance of 5.0m from the larger mass. What is the force acting on the 500kg mass?"
*Saturday, July 17, 2010 at 7:50pm by Stuck*

**physics**

A hydraulic lift has two connected pistons with cross-sectional areas 5 cm2 and 350 cm2. It is filled with oil of density 740 kg/m3. a) What mass must be placed on the small piston to support a car of mass 1400 kg at equal fluid levels? 20 OK HELP: The pressure is constant at ...
*Sunday, November 7, 2010 at 10:12pm by Sarah*

**PreCalc (still confused)**

Hello and Happy Halloween! Trying to get this problem and could use some help. Find the dimensions of the rectangle with minimum perimeter if its area is 400 square meters. Find the least perimeter. I know that a rectangle has two sides that are equal and two other sides that ...
*Sunday, November 1, 2009 at 1:01pm by Muffy*

**chem**

You have two flasks of equal volume. Flask A contains H2 at 0°C and 1 atm pressure. Flask B contains CO2 gas at 0°C and 2 atm pressure. Compare these two gases with respect to each of the following mass of gas (Flask A:Flask B)
*Tuesday, January 8, 2013 at 4:20pm by Samantha*

**English**

No. Although some carts may only sell drinks, many also serve hot dogs and pretzels.
*Monday, June 3, 2013 at 12:12am by Ms. Sue*

**physics**

The momentum of a car traveling east is different from the momentum of an identical car traveling west at the same speed. Momentum is a measure that includes both the mass and the velocity of an object. The two cars have identical mass (I am assuming they have identical mass ...
*Tuesday, June 28, 2011 at 7:54pm by Tina*

**physics**

draw the figure. there are two forces operating on the mass, mg downward, and a pushing force horizontal. Resolve both of those into components up /down the wedge surface. mg resolves down the wedge as mgSinTheta downward the pushing force has an equal and opposite force (...
*Wednesday, February 5, 2014 at 7:04pm by bobpursley*

**PreCalc**

"two sides that are equal and two other sides that are equal" is a good start. Call the length of one type of side x, and the other y. Then the area is x * y And the perimeter is 2x + 2y Check this on a small 5 * 3 rectangle, to be sure you understand it. We are told the area ...
*Saturday, October 31, 2009 at 1:55pm by jim*

**Chemistry**

Consider the equation: A + 4B=3C+3D, when equal masses of A and B are reacted, which is limiting? My possible answers are: A)if the molar mass of A is less than the molar mass of B, then B must be limiting. B) If the molar mass of A is greater than the molar mass of B, then A ...
*Wednesday, March 21, 2012 at 10:17am by Jessica*

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