Sunday

April 26, 2015

April 26, 2015

Number of results: 34,488

**physics**

TV-reception antennas for VHF (channels 2 through 13) are constructed with cross wires supported at their centers, as shown in Figure 23.24. The ideal length for the cross wires is one-half the wavelength to be received, with the more expensive antennas having one for each ...
*May 29, 2012 by Amelia*

**Math-trig**

A stairway runs up the edge of the pyramid. From bottom to top the stairway is 92 m long. The stairway makes an angle of 70° to the base edge, as shown. A line from the middle of one of the base edges to the top of the pyramid makes an angle of elevation of 52° with respect to...
*December 19, 2012 by Anonymous*

**maht,correction**

Find the area of the rectangle shown in the figure. length = radical (3) + radical (5) width = radical (3) + radical (5) My answer: a= 8 + 2 radical (15) or a = 15.75 agree, you seem to be able to do these should i leave it as the radical form or the decimal form which is more...
*March 21, 2007 by jasort20*

**Physics**

Astrology, that unlikely and vague pseudoscience, makes much of the position of the planets at the moment of one’s birth. The only known force a planet exerts on objects on Earth is gravitational. (a) Calculate the gravitational force exerted on a 4.20 kg baby by the Earth. (b...
*June 8, 2014 by Anonymous*

**math**

A figure is transformed into a new figure by being rotated 180 degrees, translated left 6 units, and dilated by a factor of 4. How are the old and new figures related? a)both congruent and similar b)congruent but not similar c)similar but not congruent d)neither similar and ...
*January 31, 2008 by robert*

**Math...Help.Thx**

20. READING: The number of pages P a student can read varies directly with the amount of time T in minutes spent reading. The student can read 90 pages in 60 minutes. Write an equation that relates P and T. PREDICT the number of pages the student can read if 90 minutes is ...
*September 9, 2014 by Jake*

**Physics**

Block A of mass 4.0 kg is on a horizontal, frictionless tabletop and is placed against a spring of negligible mass and spring constant 650 N m. The other end of the spring is attached to a wall. The block is pushed toward the wall until the spring has been compressed a ...
*September 19, 2010 by Joe*

**FIRST GRADE GRAMMER**

I AM HELPING MY DAUGHTER WITH HER HOMEWORK AND THE TEACHER MARKED HER ANSWERS WRONG. I WANT TO SEE IF SHE IS CORRECT. WHAT WOULD THE 2 ADJECTIVES BE IN (BROOKE, BRUCE AND ELSIE ALL RIDE THE SAME BUS.)
*January 15, 2008 by MEGAN*

**African Amer. Study**

Who led the most forceful strategy in order to bring an end to slavery? I wrote William Lloyd Garrison on my test and my teacher marked it wrong. I need help with this one.
*January 29, 2008 by Mack*

**general chem**

identify the 2 substances whose aqueous solutions have common properties to a marked degree and explain your answer. a) CuS, CuCI2, Na2 S, KCI b) HCI, HC2H3O2, NH4C2H3O2
*September 29, 2010 by amber*

**3rd grade math**

Where did i find word problems specially for number rounding, I also need the methods and answers, because teacher marked compleatly wrong, for what i taught to kid. Can any body help please
*October 12, 2014 by kk*

**PRE-CALC HELP **

A communications tower is located at the top of a steep hill, as shown. The angle of inclination of the hill is 58°. A guy wire is to be attached to the top of the tower and to the ground, 150 m downhill from the base of the tower. The angle α in the figure is determined ...
*November 8, 2013 by JOHN *

**magnetism **

In earlier learning sequences we described how a static magnetic field cannot change the speed (and therefore kinetic energy) of a free charged particle. A changing magnetic field can, and this is one way particle beams are accelerated. Consider free protons following a ...
*December 3, 2013 by manu*

**eletromagnets**

In earlier learning sequences we described how a static magnetic field cannot change the speed (and therefore kinetic energy) of a free charged particle. A changing magnetic field can, and this is one way particle beams are accelerated. Consider free protons following a ...
*December 5, 2013 by BJ*

**physics**

In earlier learning sequences we described how a static magnetic field cannot change the speed (and therefore kinetic energy) of a free charged particle. A changing magnetic field can, and this is one way particle beams are accelerated. Consider free protons following a ...
*December 5, 2013 by J.O*

**Physics**

A 2.9-kg 12-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 20 N. (a) Find the magnitude of the torque exerted by the rope. (b) Find the angular acceleration of ...
*November 9, 2011 by Kayla*

**Physics gravity**

A thin spherical shell has a radius of 2.4 m and a mass of 410 kg, and its center is located at the origin of a coordinate system. Another spherical shell with a radius of 1 m and mass 135 kg is inside the larger shell with its center at 0.6 m on the x axis. What is the ...
*April 8, 2013 by Chel*

**physics**

A uranium nucleus 238U may stay in one piece for billions of years, but sooner or later it decays into an a particle of mass 6.64×10−27 kg and 234Th nucleus of mass 3.88 × 10−25 kg, and the decay process itself is extremely fast(it takes about 10−20 s). ...
*January 16, 2010 by Anonymous*

**physics(URGENT)**

An airliner makes an emergency landing with its nose wheel locked in a position perpendicular to its normal rolling position. The forces acting to stop the airliner arise from friction due to the wheels and from the breaking effort of the engines in reverse thrust mode. The ...
*November 2, 2013 by anonymous*

**physics**

A tug of war has started over a popular toy. One child pulls with a force of 2.0*10^1 N[W], a second child pulls with a force of 15N[N] and a third child pulls with a force of 4.0*10^1 N [30 S of E] calculate the net force on the toy
*April 5, 2012 by Melissa*

**economics**

I really have to figure out the answers to these questions and i dont know where to start. I dont know how to draw the marginal benefit and marginal cost curves for this question. a.Sketch a marginal benefit and marginal cost diagram, with “billions of units of security per ...
*September 15, 2006 by G*

**samoana high school**

phoebe physics pulls a wagon with a force of 80 N. a) what is the net force of friction between the wagon and the ground is 12 N. b) if she uses 80 N to pull the wagon through a med puddle, and the net force on the wagon is 38 N, what friction force asts on the wagon?
*January 12, 2015 by davina*

**Physics**

Halley’s comet orbits the Sun with a period of 76.2 years. a) Find the semi-major axis of the orbit of Halley’s comet in astronomical units (1 AU is equal to the semi-major axis of the Earth’s orbit Physics - drwls, Thursday, May 5, 2011 at 8:51am There is a simple form of ...
*May 5, 2011 by Reese*

**calculus**

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. x=9y^2 y=1 x=0 about the y-axis. I am able to find the volume of other questions, but this one got me stumped. I tried drawing out the graph, but I can't really ...
*February 5, 2009 by Jay*

**calculus**

Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. x=9y^2 y=1 x=0 about the y-axis. I am able to find the volume of other questions, but this one got me stumped. I tried drawing out the graph, but I can't really ...
*February 5, 2009 by Jay*

**math**

George drove 3 miles south and 1 mile west. Using a coordinate plane to represent his trip, let the y-axis run north and south, let the x-axis run east and west, and let his original position be the intersection of the axes. Which ordered pair best represents his final location?
*January 17, 2012 by Anonymous*

**physics**

The two masses in the Atwood's machine shown in the figure are initially at rest at the same height. After they are released, the large mass, , falls through a height and hits the floor, and the small mass, , rises through a height . Find the speed of the masses just before ...
*July 1, 2010 by meera*

**physics**

Hi, can someone please help with this question. A thin, uniform rod is bent into a square of side length a. If the total mass is M, find the moment of inertia about an axis through the center and perpendicular to the plane of the square. Use the parallel-axis theorem. Express ...
*October 18, 2008 by Mary*

**physic**

Need Help please. Consider the following mass distribution where the x and y coordinates are given in meters: 5.0 kg at (0.0, 0.0) m, 3.0 kg at (0.0, 4.3) m, and 4.0 kg at (2.8, 0.0) m. Where should a fourth object of 8.2 kg be placed so the center of gravity of the four-...
*November 23, 2009 by Chan*

**Physics Help Please!!!!**

A car is at rest on a horizontal road. What is the value of the frictional force? Explain your answer. A bison stands at rest on the horizontal ground. What is the value of the frictional force? Explain. The normal force always has a direction perpendicular to the surface that...
*October 9, 2014 by Tom*

**calc**

standard equations of circles that have centers on line 5x-2y=-21 and are tangent to both axis. Any ideas?? First express the line as in point slope form y=(5/2)x - 21/2 The center must be on the line, so it is a point expressed as (x,(5/2)x - 21/2) In order for the circle to ...
*September 26, 2006 by Melba*

**English**

I wrote, "I like to swim in summer." My teacher marked it wrong and said it should read "I like to swim in THE summer." Can anyone offer an explanation, please, why my way is wrong? I don't know why it was marked wrong. Both with and without "the" are correct. It sounds as if ...
*April 17, 2007 by Charlie*

**physics**

Ten bags of top soil, each weighing 180 N, are placed on a 2.90-m long sheet of wood. They are stacked 0.50 m from one end of the sheet of wood, as shown below. Two people lift the sheet of wood, one at each end. Ignore the weight of the wood, how much force must each person ...
*January 2, 2013 by Jamison*

**Physics**

A solar sail is used to propel a spacecraft. It uses the pressure (force per unit area) of sunlight instead of wind. Assume the sail and its spacecraft have a mass of 245 kg. If the sail has an area of 62,500 m2 and achieves a velocity of 8.93 m/s in 12.0 hours starting from ...
*May 25, 2012 by Karie*

**Physics**

Cn u plz gv explaination 2 d solutions steps by steps briefly? Cz i really dnt understand hw 2 apply d formula wen i revise it nw. [g=10 ms^-2 ] Two particles P & Q, of masses 0.2 kg & m kg respectively, are attached to the ends of a light inextensible string. The particle P ...
*September 29, 2008 by LingSpirit*

**Physics**

A construction supervisor of mass M = 83.7 kg is standing on a board of mass m = 30.5 kg. The board is supported by two saw horses that are a distance of 4.50 m apart. If the man stands a distance x1 = 1.30 m away from saw horse 1 as shown, what is the force that the board ...
*December 17, 2007 by rory*

**physics**

A construction supervisor of mass M = 83.7 kg is standing on a board of mass m = 30.5 kg. The board is supported by two saw horses that are a distance of 4.50 m apart. If the man stands a distance x1 = 1.30 m away from saw horse 1 as shown, what is the force that the board ...
*December 20, 2007 by rory*

**physics**

A 41.0-kg body is moving in the direction of the positive x axis with a speed of 306 m/s when, owing to an internal explosion, it breaks into three pieces. One part, whose mass is 8.0 kg, moves away from the point of explosion with a speed of 326 m/s along the positive y axis...
*March 24, 2014 by Tsion*

**physics**

A man is pulling on a rope with a force of 88N directed t an angle or 20 degrees to the horizontal. What is the x component of this force? What is the Y component of this force? Answer in units of N This is what i did, but i dont know if its right: x: cos(20)88=82.69 N y: tan(...
*July 2, 2011 by alexa*

**calculus**

a solid lies between planes perpendicular to x-axis at x=0 and x=17,cross section perpendicular to axis interval 17 greater or equal x & x greater or equal 0 are squares of diagonals go from parabolas y=-2x^(0.5) & y=2x^(0.5). find the volume of the solid
*March 27, 2012 by Anonymous*

**Physics**

A 100kg trolley is being pushed up a rough 30Â° incline by a constant force. The friction force between the incline and the trolley is 110N. (a) Determine thd value of the constant force that will move the trolley up the incline at a constant velocity of 5m/s. (b) Find the ...
*September 7, 2014 by Slavh*

**Physics**

Vector V1 is 6N along the negative axis. Vector V2 is 4.5 N and point 45 degrees north of the x axis. Find the x and y components of each vector and find the resultant R=V1+V2with the components.
*November 26, 2013 by Maddie*

**Calculus**

Let R be the region enclosed by the graphs y=e^x, y=x^3, and the y axis. A.) find R B.) find the volume of the solid with base on region R and cross section perpendicular to the x axis. The cross sections are triangles with height equal to 3 times the length of their base.
*May 13, 2014 by Michelle*

**physics**

A person pushes a 17.0 kg lawn mower at constant speed with a force of 74.0 N directed along the handle, which is at an angle of è = 48.0° to the horizontal (b) Calculate the horizontal retarding force on the mower (c) Calculate the normal force exerted vertically upward on ...
*February 2, 2012 by kayla*

**Physics - Help!**

All, Please just help me in this, I will need you to please give me the clue-thanks. a flashlamp bulb is marked '2.5V,0.30A' and has to be operated from a dry battery of e.m.f 3.0V for the current p.d. of 2.5V to be produced across it. Why?
*April 18, 2007 by Sola*

**geometry**

Assume that the given angles have been measured, and calculate the angles (marked as x) that could not be found by direct measurement. a = 38 x = 1Your answer was incorrect, but has changed from what was graded.
*September 15, 2010 by Anonymous*

**Math for educators 1**

Jim bought two shirts that were originally marked at $40 each. One shirt was discounted 20% and the other was discounted 25%. The sale tax was 4.5%. How much did he spend in all?
*January 7, 2011 by Aquana Moore*

**Mathematical for Educators 1**

Jim bought two shirts that were originally marked at $40 each. One shirt was discounted 20% and the other was discounted 25%. The sales tax was 4.5%. How much did he spend in all
*April 21, 2011 by Sandra*

**Math: permutation**

Seven cards, each marked a letter can be arranged to spell NUMBERS. how many three letter code words can be formed with 2 consonants and one vowel? Thanks 😁
*November 3, 2014 by Conor*

**Math-URGENT,**

Given that y varies directly with x, write a direct variation equation that relates x and y. x=1/3 <---(fraction), y=2 **Provide an explanation as well, please.
*October 24, 2011 by Izzy*

**Alegra II**

If y varies directly as the cube of x and inversely as the square root of w, fill in the missing values in the table. I need help finding the answers w x y 1.27 ? 3.05 ? 5.66 1.93 4.66 2.75 3.87 7.07 1.56 ?
*November 21, 2011 by Arielle*

**ALG2 **

If Y varies inversely as X^2, determine what Y would be if X = 2 and another point on the equation is (1,8). The answer I got was y=1/2^2=1/4 I'm not sure I worked this out correctly, is this correct?
*December 28, 2012 by Yvette B.*

**Maths**

Suppose that y varies inversely with x and that y = 2 when x = 8. What is an equation for the inverse variation? What would the answer be? What is the factored form of the expression? s^2 – 81 (s – 9)(s – 9) (s – 9)(s + 11) (s – 9)(s + 9) (s + 9)(s + 9) I think that it is B. ...
*May 23, 2014 by Woody*

**algebra. help!**

Find the slope of a line that passes through (-2,-3) and (1,1). a. 1/3 b. 1 c. 2 d. 4/3 For the equation -4y=8x, what is the constant of variation? a. -4 b. -2 c. 1 d. 2 Suppose y varies directly with x, and y=24 when x=8. What is the value of y when x=10 a. 10 b. 30 c. 80 d.240
*November 20, 2014 by Hannah*

**physics**

The weightless strut in the figure below is not attached to the wall; it is prevented from falling only by friction. (Let w = 360 N, L = 5.25 m and h = 3.25 m.) (a) Find the magnitude of the force of friction between the wall and the strut. Correct: Your answer is correct. (b...
*June 11, 2014 by Anonymous*

**trigonometry**

The sprockets and chain of a bicycle are shown in the figure. The pedal sprocket has a radius of 4 in., the wheel sprocket a radius of 2 in., and the wheel a radius of 13 in. The cyclist pedals at 45 rpm. (a) Find the angular speed of the wheel sprocket. rad/min (b) Find the ...
*November 29, 2012 by monic*

**Algebra question HELP!**

Beatriz is creating graphs for her city’s Parks Department. Beatriz is trying to persuade the Parks Department to put in more gazebos for shade. For a local park, Beatriz wants to demonstrate the attendance as it changes every week. She also wants to show the temperature ...
*August 21, 2014 by Sdog*

**Algebra**

f(x) = -4(x+2)(x - 5)^3 - 2, multiplicity 1, touches the x-axis and turns around; 5, multiplicity 3, touches x-axis and turns around I left (x+2) out of the equation. Can you explain to me these type of problems, I only understand a little bit of it.
*October 23, 2007 by Tyra*

**physics**

A limb, which is 1m long, moves through an angle of 30 degrees in 0.5 seconds. a) What is the average angular velocity of: i) Its end? ii) A point 30 cm from the axis of rotation? b) What is the linear velocity of: i) Its end? ii) A point 30 cm from the axis of rotation?
*February 5, 2010 by Anonymous*

**physics**

A limb, which is 1m long, moves through an angle of 30 degrees in 0.5 seconds. a) What is the average angular velocity of: i) Its end? ii) A point 30 cm from the axis of rotation? b) What is the linear velocity of: i) Its end? ii) A point 30 cm from the axis of rotation?
*February 5, 2010 by Anonymous*

**Physics**

A body moves in rectilinear motion along the x-axis with an acceleration of a = 24 - t - 6 t^2 . Starting with an initial position at the origin (x = 0) and an initial velocity of 4 ft/s to the left (along the negative x-axis), what is the position of the body at the end of 4 ...
*May 14, 2010 by Anthony*

**mechanics 12**

A 1.8 kg breadbox on a frictionless incline of angle θ = 37° is connected, by a cord that runs over a pulley, to a light spring of spring constant k = 120 N/m, as shown in the figure below. The box is released from rest when the spring is unstretched. Assume that the ...
*November 2, 2012 by kunal *

**Math**

The base of a solid S is the simicircular region enclosed by the graph of y = the sqrt of [4-x^2] and the x-axis. If the cross sections of S perpendicular to the x-axis are squares, the the volume of S is...? I've worked this out a few ways using what I know abt finding the ...
*May 7, 2007 by James*

**Chemistry**

My mind is bleeding again. I am trying to figure out the molarity of acetic acid in Vinegar. We used a standard solution of .613 Molars of NaOH. We added 33.75mL of NaOH to completely titrate/neutralize 25mL of Vinegar and we're supposed to be able to figure out the molarity ...
*June 22, 2010 by Casey*

**physics**

Driving home from school one day, you spot a ball rolling out into the street (see the figure ). You brake for 1.00 , slowing your 970- car from 16.0 to 9.50 . What was the magnitude of the average force exerted on your car during braking? How far did you travel while braking?
*September 23, 2011 by Anonymous*

**physics**

In the figure below, a uniform sphere of mass m = 2.50 kg and radius r = 2.4 cm is held in place by a massless rope attached to a frictionless wall a distance L = 10.2 cm above the center of the sphere. (a) What is the tension in the rope? N (b) What is the force on the sphere...
*December 13, 2008 by Jane*

**PYHSICS**

Vector A with arrow is directed along the positive y-axis and has magnitude 9.0 units. Vector B with arrow is directed along the negative x-axis and has magnitude 4.0 unit. (a) What are the magnitude and direction of A with arrow + B with arrow? magnitude Incorrect: Your ...
*February 1, 2015 by LAIALI*

**calculus**

Find the volume of the solid whose base is the region bounded by the graphs of y=x^3,x=1, and the x-axis, and whose cross sections perpenditular to the x-axis are semicircles. What would be the radius in this case? I thought it would just be x^3, but others are saying (x^3)/2...
*January 7, 2007 by Jin*

**8.01x Classical Mechanics**

Sliding Blocks (14 points possible) A small cube of mass 1.0 kg slides down a circular and frictionless track of radius 0.6 m cut into a large block of mass 4.0 kg as shown in the figure below. The large block rests on a horizontal and frictionless table. The cube and the ...
*January 11, 2014 by Anonymous*

**Physics**

One end of a uniform 3.20-m-long rod of weight Fg is supported by a cable at an angle of θ = 37° with the rod. The other end rests against the wall, where it is held by friction as shown in the figure below. The coefficient of static friction between the wall and the rod...
*April 5, 2014 by Joe*

**Physics**

A trunk of mass m = 1.100 kg is pushed a distance d = 32.0 cm up an incline with an angle of inclination theta = 26.0 ° by a constant horizontal force P = 150. N. The coefficient of kinetic friction between the trunk and the incline is 0.330. a) Calculate the work done on the ...
*October 19, 2012 by Steeve*

**Physics**

Two blocks of masses m1 = 2.00 kg and m2 = 4.50 kg are each released from rest at a height of y = 5.80 m on a frictionless track, as shown in the figure below, and undergo an elastic head-on collision. (a) Determine the velocity of each block just before the collision. Let the...
*November 7, 2012 by Corey*

**physics**

A point charge of -4.00nC is at the origin, and a second point charge of 6.00nC is on the axis at x = 0.800m . Find the magnitude and direction of the electric field at each of the following points on the axis. x_2 = 17.0cm, x_3 = 1.30m , x_4=-17.0cm
*September 12, 2008 by Erin*

**AP physics**

Vector A has a magnitude of 8.00 units and makes an angle of 45.0° with the positive x-axis. Vector B also has a magnitude of 8.00 units and is directed along the negative x-axis. Using graphical methods, find (a) the vector sum A + B and (b) the vector difference A – B. Could...
*August 23, 2009 by jackie*

**ibnozohr**

A point charge Q1=−2 μC is located at x=0, and a point charge Q2=+8 μC is placed at x=−0.5 m on the x-axis of a cartesian coordinate system.The goal of this problem is to determine the electric field, E⃗ (x)=E(x)xˆ, at various points along the x-...
*February 24, 2013 by Anonymous*

**math (geometry)**

The pre-image of a reflection lies in quadrant II and the image is in quadrant III. which line could be the line of reflection? a) y=x b) y=-x c) x-axis d) y-axis if you can then please do explain whay. i have no clue!!! thanks for your help!
*February 23, 2009 by jess*

**physics**

A grindstone in the shape of a solid disk with diameter 0.520 and a mass of = 50.0 is rotating at = 860 . You press an ax against the rim with a normal force of = 250 (Figure 1) , and the grindstone comes to rest in 7.40 . Find the coefficient of friction between the ax and ...
*May 3, 2013 by amy*

**physics**

A water-skier is being pulled at a steady speed in a straight line. her mass plus the mass of the ski is 65 kg. the pull of the tow rope on her is 520 N. a...i) What is the vertical component Y of the push of the water on the ski?? ....ii) What is the horizontal component X of...
*September 3, 2012 by Mariam*

**physics**

A 7600 rocket blasts off vertically from the launch pad with a constant upward acceleration of 2.25 and feels no appreciable air resistance. When it has reached a height of 560 , its engines suddenly fail so that the only force acting on it is now gravity.What is the maximum ...
*October 2, 2012 by Anonymous*

**physics**

A 7600 rocket blasts off vertically from the launch pad with a constant upward acceleration of 2.25 and feels no appreciable air resistance. When it has reached a height of 560 , its engines suddenly fail so that the only force acting on it is now gravity.What is the maximum ...
*October 2, 2012 by Anonymous*

**SkatingDJ**

4. The number cube shown is rolled and the spinner shown is spun. Find P(an odd number and yellow). The number cube goes up to five. The spinner has four spaces. two are yellow, one is blue and 1 is green. 1/4 3/4 3/5 3/20
*April 19, 2014 by PLS HELP MATH ASAP!!!!!*

**Physics**

1)The direction of the force on doubly ionized helium atoms(alpha particles)moving at right angles to a magnetic field is opposite to the direction of the force given by the third right-hand rule. true. 2)The electromotive force is a force that makes charges flow from a point ...
*April 11, 2008 by Jon*

**College Physics**

A 5.0 gram coin is placed 5.0 cm from the axis of a rotating turntable of variable speed. When the speed of the turntable is slowly increased, the coin remains fixed on the turntable until a rate of 36 RPM is reached and the coin slides off. A.) What is the coefficient of ...
*March 23, 2010 by L***

**Calculus**

Suppose that the region between the x-axis and the curve y=e^-x for x>=0 has been revolved around the x-axis. Find the surface area of the solid. I got 3*pi The book shows an answer of pi * [sqrt(2) + ln(1 + sqrt(2))] Where do I go wrong? For the sides of the surface, I ...
*January 13, 2008 by mathstudent*

**Physics**

A point charge of -14nC and +12nC is located 12cm along the x-axis. Determine the magnitude and direction of the electric field intensity at point P at the mid-point and 8cm perpendicular from the x-axis: p | | 8.0cm | | -14nC.---------------. 12 nC 6cm 6cm Please help getting...
*November 24, 2010 by Eddie*

**physics**

a mass m1 moves along the x-axis with velocity of magnitude v0 on a frictionless table. it strikes another mass m2 which is initially at rest. the mass m1 goes off along the the y-axis. if half the original kinetic energy is lost in the collision, with what speed and at what ...
*November 30, 2010 by shamrakh*

**ap calc**

A rectangle is inscribed into the region bounded by the graph of f(x)=(x^2-1)^2 and the x-axis, in such a way that one side of the rectangle lies on the x-axis and the two vertices lie on the graph of f(x). what is the maximum possible area of such a rectangle? Please help I ...
*November 18, 2014 by Anonymous*

**AP Calc**

A rectangle is inscribed into the region bounded by the graph of f(x)=(x^2-1)^2 and the x-axis, in such a way that one side of the rectangle lies on the x-axis and the two vertices lie on the graph of f(x). What is the maximum possible area of such a rectangle? My Work: y=(x^2...
*November 22, 2014 by Luke*

**Geometry**

I don't know if this is the place to put it but anyways Complete each of the following problems in the space provided if you need more space attach additional sheets. You must show all work and/or an explanation in order to receive credit. 1. Older television screens have an ...
*April 6, 2008 by Bob*

**physics**

two point charges of 2 c and -3c are separated by 6cm what is the magnitude of the electrostatic force between them? and is the force attractive or repulsive? explain and what happens to the magnitude of the force when the distance is increased by a factor of 2 to 12cm
*February 4, 2013 by debra*

**physics**

A block of mass m = 3 kg is attached to a spring (k = 28 N/m) by a rope that hangs over a pulley of mass M = 7 kg and radius R = 6 cm, as shown in the figure. Treating the pulley as a solid homogeneous disk, neglecting friction at the axle of the pulley, and assuming the ...
*March 28, 2012 by Angelina*

**Physics please help**

A small circular object with mass m and radius r has a moment of inertia given by I = cmr2. The object rolls without slipping along the track shown in the figure. The track ends with a ramp of height R = 3.0 m that launches the object vertically. The object starts from a ...
*March 29, 2012 by Adam*

**Physics 30**

How do you figure out if a collision is elastics or inelastic, when it is dropped and then bounces? Do you figure out the velocity and then put that in the Ek formula?
*February 23, 2009 by Jodine*

**Math**

Two corresponding sides of similar polygons are in the ratio of 5:4. If the perimeter of the smaller figure is 40, what is the perimeter of the larger figure?
*February 7, 2010 by Crystal*

**AED**

Assess Leslie's teaching using the effective teaching characteristics outlined in Figure 11.1. I can't figure out what i am suppose to do
*June 24, 2010 by Anonymous*

**math**

A figure has 2 sets of parallel sides and 4 right angles. All of the sides are the same length. What are the 3 names for the figure?
*November 29, 2012 by mythreyee*

**physics**

Two blocks connected by a string are on a horizontal frictionless surface. The blocks are connected to a hanging weight by means of a string that passes over a pulley as shown in the figure below, where m1 = 1.75 kg, m2 = 2.85 kg, and m3 = 4.95 kg. (a) Find the tension T in ...
*February 8, 2011 by Anonymous*

**physics **

An object is placed in front of a concave mirror, 16.0 cm from the mirror's focal point. The image formed by the mirror is two times farther away from the focal point. Calculate the focal length of the mirror. There are actually two possible image distances di that satisfy the...
*February 12, 2015 by Ted*

**Basic Biomechanics**

A car teeters on the edge of a cliff. A eagle weighing 55 N lands on the hood 1.1 M from the edge of the cliff which functions as an axis. At the same time, an owl weighting 44 N lands on the trunk 1.5 m from the axis. What are the torques exerted by the birds? What will ...
*June 8, 2012 by Joshua Mclaurin*

**Physics**

Charged particles such as ions can separate the charges inside of overall electrically neutral atoms, thus making an electric dipole. A dipole is characterized with a dipole moment p=αEexternal, where α is the polarizability of an atom, and Eexternal is the external ...
*July 1, 2013 by Mary*