Thursday

April 17, 2014

April 17, 2014

Number of results: 206,161

**AP Physics B (Heat Engines)**

18. (II) At a steam power plant, steam engines work in pairs, the heat output of the first one being the approximate ehat input of the second. Th eoperating temeprautres of the first are 680 degrees C and 430 degrees C, and of the second 415 degrees C and 280 degrees C. If the...
*Wednesday, December 16, 2009 at 8:12pm by Joe*

**AP Physics B (Heat Engines)**

I know that efficiency is e = |W|/|QH| were the H is the subscript I know that 900 MW is a value of power which is not work I know that |QH| is 2.8 E8 J/kg but I do not like the units for this, J/kg, as I thought Q was measured in joules only... How do I find the work done?
*Wednesday, December 16, 2009 at 8:12pm by Joe*

**AP Physics B (Heat Engines)**

the work that engine one does is (using your numbers) .65*.17Heatinput Then the waste heat is Heatinput- work doneinengine1 But this is used as input to engine2, so the work done in engine 2 is Heatinput*massrate(1-.65*.17)(.65*.14) But the total work done is Heat input*...
*Wednesday, December 16, 2009 at 8:12pm by bobpursley*

**AP Physics B (Heat Engines)**

Do not multiply the percentages you calculated by .65, because you already multiplied it to get 17% and 14.6% :)
*Wednesday, December 16, 2009 at 8:12pm by T*

**Physics (Heat Engines)**

21. A heat engine operates in a cycle between temperatures 700 K and 400 K. The heat input to the engine during each cycle is 2800 J. What is the maximum possible work done by the engine in each cycle? (A) 1200 J (B) 1600 J (C) 2100 J (D) 2800 J (E) 4400 J I believe that the ...
*Saturday, March 6, 2010 at 10:32pm by Kate*

**AP Physics B**

Calculate the force of gravity on a spacecraft 12,800 km (2 earth radii) aboce the Earth\'s surface if its mass is 1400 kg. Ok for this question I first converted to meters for the radius then applied newtons law net force radial = m1 a radial = Fg = r^-2 G m1 m2 Fg = (1.28 E ...
*Friday, September 11, 2009 at 7:56pm by AP Physics B*

**AP Physics B**

but i thought you were suppose to treat the Earth as the a whole object or something... my book said to think of it as one particle because everything is attracte4d to it no just the center of the plannet like even a person standing on the earth\'s surface has a nearly ...
*Friday, September 11, 2009 at 7:56pm by AP Physics B*

**AP Physics B**

can you check my reasoning 1. The problem statement, all variables and given/known data ok well then... we did a lab were you have a hanging mass attached to a stirng that went through a straw and was attached to a rubber stopper. The lab was to find the mass of the rubber ...
*Sunday, September 13, 2009 at 8:42pm by AP Physics B*

**AP Physics B**

why would the hanging mass of a radial acceleration if it\'s just in equilibrium...??? m1 V^2/r = m2 g
*Sunday, September 13, 2009 at 8:42pm by AP Physics B*

**AP Physics B**

I did this net force = (m1 + m2) (radial acceleration of mass m1) = force of gravity on mass m2
*Sunday, September 13, 2009 at 8:42pm by AP Physics B*

**AP Physics B**

mass m1 was a robber stooper m1 was attached to a string that went through a straw on the other end of the straw the string came out and was attached to a mass m2 students spun mass m1 with hand on straw as the stopper spun around mass m2 the hanging mass was in equilibrium as...
*Sunday, September 13, 2009 at 8:42pm by AP Physics B*

**AP Physics B**

I'm unsure how to even start this problem or how I'm suppose to find out the distance at which destructive interference would occur... Two loudspeakers are 1.8 m apart. A person stands 3.0 m from one speaker and 3.5 m from the other. (a) What is the lowest frequency at which ...
*Sunday, November 15, 2009 at 3:19pm by AP Physics B*

**AP Physics B**

Were do I find AP Physics B Mulitiple Choice Questions. I know that they are free on the internet somewere I can not seem to find them. I also can not find free response questions older than 1999 on the college bord website h t t p : / / a p c e n t r a l . c o l l e g e b o a...
*Wednesday, December 16, 2009 at 2:01pm by AP Physics B*

**Physics**

Piano tuners tune pianos by listening to the beats between the harmonics of two different strings. When properly tuned, the note A should have the frequency 440 Hz} and the note E should be at 659 Hz}. The tuner can determine this by listening to the beats between the third ...
*Sunday, November 8, 2009 at 3:27am by AP*

**TO BOBPURSLEY**

I have responded
*Sunday, September 13, 2009 at 9:38pm by AP Physics B*

**BOBPURSLEY or anyone**

h t t p : / / w w w . j i s k h a .c o m / d i s p l a y . c g i ? i d = 1 25 2 8 8 8 9 2 9 ok hmmm m2 g = m1 (acceleration radial) so then if this is the correct equation my question... is how do you know when to consider the masses as a system and when not to? net force = ...
*Sunday, September 13, 2009 at 10:29pm by AP Physics B*

**AP Physics B (chemistry bit)**

I think I'm doing this wrong In an internal combustion engine, air at atmospheric pressure and a temperature of about 20 degrees celcius is compressed in the cylinder by a piston to 1/9 of its original volume (compression ratio = 9.0). Estimate the temperature of the ...
*Sunday, November 15, 2009 at 6:10pm by AP Physics B (chemistry bit)*

**AP Physics**

can you please explain this to me... Were given this eqaution x = At^2 + B were A = 2.10 m/s^2 B = 2.80 m ok and this is an example problem and it's wlking us through it find the instantaneous velocity at t=t2=5.00s equlas the slope of the tangent to the curve at point P2 ...
*Saturday, June 13, 2009 at 1:12pm by AP Physics*

**Physics (Heat Engines)**

wait no the answer is A how though?
*Saturday, March 6, 2010 at 10:32pm by Kate*

**Physics (Heat Engines)**

In a maximum-efficiency "Carnot" cycle, the ratio Qout/Qin = Tout/Tin because the entropy change when heat is absorbed and released by the fluid is the same. T remains the same during each process. Therefore e = 1 - Tout/Tin = 3/7, and Wout = 3/7 * 2800 = 1200 J Practical ...
*Saturday, March 6, 2010 at 10:32pm by drwls*

**physics**

thanks for the help earlier just got a question I'm taking AP Physics B this year does that mean next year I would Take AP Physics C??? I don't know if the material in C convers the same material plus the additional calculus material or what??? Could I take AP Calculus while ...
*Sunday, August 9, 2009 at 9:12pm by physics*

**AP Physics B**

Then you are in great trouble in Physics B. You need to review periodic motion in your text.
*Wednesday, December 16, 2009 at 4:57pm by bobpursley*

**Physics**

A whistle you use to call your hunting dog has a frequency of 24 kHz, but your dog is ignoring it. You suspect the whistle may not be working, but you can't hear sounds above 23 kHz. To test it, you ask a friend to blow the whistle, then you hop on your bicycle. At what ...
*Saturday, November 7, 2009 at 10:28pm by AP*

**Physics**

these answers are not correct
*Sunday, November 8, 2009 at 3:27am by AP*

**physics**

A block of ice of mass m rests on the very top of a smooth metal hemishpere. The tiniest nudge sends it sliding down the side of the hemisphere. The acceleration of gravity is g and the radius of the hemisphere is R. At what angle, with respect to the vertical, does the block ...
*Wednesday, February 6, 2013 at 1:49pm by ap*

**University Physics**

Betty Bodycheck (mB = 60.3 kg, vB = 22.0 km/h in the positive x-direction) and Sally Slasher (mS = 44.5 kg, vS = 28.0 km/h in the positive y-direction) are both racing to get to a hockey puck. Immediately after the collision, Betty is heading in a direction that is 76.0° ...
*Monday, October 8, 2012 at 11:20pm by AP*

**AP Physics B**

http://www.collegeboard.com/student/testing/ap/physics_b/samp.html?physicsb If you go to the nearest college bookstore, or BarnesNoble, the study guides are most excellent. http://www.google.com/search?q=barnes+noble+physics+B+study+guide&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla...
*Wednesday, December 16, 2009 at 2:01pm by bobpursley*

**AP Physics B**

Hmmm. If it is 2 earth radii from the EArth, that means comparing g at the surface of earth (1 earth radi) to "g" at 3 earth radi is 1/9 gsurface So the gravitaional force field is g=1/9*9.8N/kg force on spacecraft= mass* 1/9*9.8 N/kg =1400kg*1.09N/kg=not your answer. Your ...
*Friday, September 11, 2009 at 7:56pm by bobpursley*

**AP Physics B**

Nuts to that thinking. One considers planets point particles, and for Newtons laws, one measures distance from the center. Newton himself had to prove this, and invented calculus to prove it. If you add all the force of gravity for each little rock all over the Earth, it acts ...
*Friday, September 11, 2009 at 7:56pm by bobpursley*

**AP Physics B**

see the section estimating g from Newton's laws.. http://en.wikipedia.org/wiki/Earth%27s_gravity
*Friday, September 11, 2009 at 7:56pm by bobpursley*

**AP Physics B**

Not if I understand what you did. a mass m1 was spun horizontally, and tied to a hanging mass m2. IF that is true, then radial force=hanging force m2 v^2/r=m1g I dont understand what you did.
*Sunday, September 13, 2009 at 8:42pm by bobpursley*

**AP Physics B**

What was the experiment setup? Was m1 rotating horizontally? Was m2 a hanging mass attacahed to the cord holding the rotating mass?
*Sunday, September 13, 2009 at 8:42pm by bobpursley*

**AP Physics B**

Then m2 was as I thought, it was supplying the tension counter centripetal force. m2*g=m1*v^2/r
*Sunday, September 13, 2009 at 8:42pm by bobpursley*

**AP Physics B**

see question 48 as an example http://tuhsphysics.ttsd.k12.or.us/Tutorial/NewIBPS/PST4_2/T4_2.htm
*Sunday, November 15, 2009 at 3:19pm by bobpursley*

**AP Physics B**

YOu set the half wavelength to what ever it is . Second harmonic is to most, the 2xfundamental. However, I have to tell you, there are some that use first harmonic to mean 2x. This is from the musical usage of the term first overtone, which is 2xfundemantal. The usage is ...
*Sunday, November 15, 2009 at 3:19pm by bobpursley*

**AP Physics B**

The college board website only has exams from 1999 to last years. Some how my teach has gotten ahold of the free response questions from like 1980 and he said that they are open to the public and can be found on the internet. I can't seem to find were they are all the exams ...
*Tuesday, November 17, 2009 at 8:28pm by Jeff*

**AP Physics B**

I find it very odd that your teacher is not supplying you with this information. http://www.google.com/search?q=ap+physic+B+exams+free+response&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
*Tuesday, November 17, 2009 at 8:28pm by bobpursley*

**AP Physics B**

The position of a 20 g oscillating mass is given by x(t) = (2.0 cm) cos(2t), where t is in seconds. Determine the following. The Amplitude (cm.) The Period (s.) The Spring Constant (N/m) The maximum speed (cm/s) The total energy (J) The velocity at t=0.40 s. (cm/s) I need your...
*Wednesday, December 16, 2009 at 4:57pm by Charlie*

**AP Physics B**

Well, all this is level one definition work. What is it you dont understand?
*Wednesday, December 16, 2009 at 4:57pm by bobpursley*

**AP Physics B**

i figured out the amplitude and the period, i just dont kno how to get to the other 4 with using simple harmonic motion equations
*Wednesday, December 16, 2009 at 4:57pm by Charlie*

**AP Physics B**

spring constant: Period=2PI sqrt (m/k) max speed= 2*2 energy= 1/2 k x^2 velocity= 2*2 sin2t
*Wednesday, December 16, 2009 at 4:57pm by bobpursley*

**AP Physics B**

can u give me these in numbers please, i dont understand what formulas u wrote and what some of the stuff in ur formulas are
*Wednesday, December 16, 2009 at 4:57pm by Charlie*

**AP Physics B**

mmm i need these as well and i cant find them mmm any help out there did u find them
*Tuesday, November 17, 2009 at 8:28pm by leticia*

**AP Physics B**

idk !!!! im having trouble on the same question !!!! GOT NOO IDEA !!
*Sunday, November 15, 2009 at 3:19pm by TORI*

**AP Physics B**

how do yo find the spring constant?
*Wednesday, December 16, 2009 at 4:57pm by Anna*

**AP Physics B**

What is the force of Friction as a 12 kg object slides down for 30 meters down a 30 degrees incline at a constant velocity?
*Tuesday, November 2, 2010 at 1:58pm by Asim*

**AP Physics B**

An object of mass 3.2 kg is allowed to fall from rest under the force of gravity for 3.5 s. What is the change in its momentum? Ignore air resistance.
*Wednesday, December 8, 2010 at 7:56pm by Jamie*

**AP Physics B**

What's the equation to find the maximum height after a spring decompresses?
*Sunday, January 30, 2011 at 4:13pm by Flower*

**AP Physics B**

The fundamental frequency of a string fixed at both ends is 388 Hz. How long does it take for a wave to travel the length of this string?
*Wednesday, February 16, 2011 at 6:54pm by Jackie*

**Ap physics b**

A piece of copper wire is formed into a single circular loop of radius 11 cm. A magnetic field is oriented parallel to the normal to the loop, and it increases from 0 to 0.65 T in a time of 0.45 s. The wire has a resistance per unit length of 3.3 10-2 /m. What is the average ...
*Wednesday, April 6, 2011 at 9:23pm by christina*

**Ap physics B**

Four positive charges are fixed at the corners of a square, as shown above. Three of the charges have magnitude Q, and the fourth charge has a magnitude 2Q. Point P is at the center of the square at a distance r from each charge. 22. What is the electric potential at point P...
*Sunday, May 15, 2011 at 2:46pm by christina*

**Ap physics B**

It is so simple: I suspect you are over thinking. Potential is a scalar, not vector. So add the four potentials, three are the same, and one is double, (2+3) V=5k(q/r)
*Sunday, May 15, 2011 at 2:46pm by bobpursley*

**AP Physics B**

h = ½gt², since diver's initial vertical speed is 0 h = 44 m x = vt x = 5.4 m
*Tuesday, September 21, 2010 at 2:33pm by Saif Hamdan*

**AP Physics b**

Design a carnival ride on which standing passengers are pressed against the inside curved wall of a rotating vertical cylinder. It is to turn at most at 1/7 revolution per second. Assuming a minimum coefficient of friction of 0.10 between clothing and wall, what diameter ...
*Thursday, November 3, 2011 at 9:33pm by gaston*

**AP Physics B**

A 1010 kg geosynchronous satellite orbits a planet similar to Earth at a radius 1.97 Ã— 105 km from the planetâ€™s center. Its angular speed at this radius is the same as the rotational speed of the Earth, and so they appear stationary in the sky. That is, the period of the ...
*Sunday, October 14, 2012 at 7:30pm by Abby*

**AP Physics B**

what is the force of gravity at this altitude? Fg=GMeMs/r^2
*Sunday, October 14, 2012 at 7:30pm by bobpursley*

**AP Physics B**

A gadget of mass 17.85 kg ﬂoats in space without motion. Because of some internal malfunction, the gadget violently breaks up into 3 fragments ﬂying away from each other. The ﬁrst fragment has mass m1 = 4.12 kg and speed v1 = 3.57 m/s while the second ...
*Thursday, November 1, 2012 at 6:34pm by Daisy*

**AP Physics B**

A 2189 kg car moving east at 9.73 m/s collides with a 3285 kg car moving north. The cars stick together and move as a unit after the collision, at an angle of 35.7◦ north of east and at a speed of 4.79 m/s. What was the speed of the 3285 kg car before the collision? ...
*Thursday, November 1, 2012 at 6:46pm by Daisy*

**AP Physics B**

A 0.408 kg puck, initially at rest on a horizontal, frictionless surface, is struck by a 0.0886 kg puck moving initially along the x axis with a speed of 3.14 m/s. After the collision, the 0.0886 kg puck has a speed of 2.14 m/s at an angle of 38◦ to the positive x axis. ...
*Thursday, November 1, 2012 at 6:47pm by Daisy*

**AP Physics B**

Use the equation m1u1 + m2u2 = m1v1 + m2v2 (mass 1 x its initial velocity + mass 2 x its initial velocity = mass 1 x its final velocity + mass 2 x its final velocity)
*Thursday, November 1, 2012 at 6:46pm by Lala*

**AP Physics B**

resolve the two momentum vectors 1 and 2, then the momentum for piece there is equal and oopposite to that, and you can solve for v3
*Thursday, November 1, 2012 at 6:34pm by bobpursley*

**AP physics B**

A billiards cue ball of mass 0.380 kg has a perfectly elastic head-on collision with a standard pool ball. The second pool ball which started at rest travels with a speed which is half the original speed of the cue ball. (a) Calculate the mass of the pool ball. kg (b) ...
*Friday, November 2, 2012 at 5:54pm by Need help fast*

**AP Physics B**

An air puck of mass 0.102 kg is tied to a string and allowed to revolve in a circle of radius 1.06 m on a horizontal, frictionless table. The other end of the string passes through a hole in the center of the table and a mass of 0.78 kg is tied to it. The suspended mass ...
*Friday, November 9, 2012 at 1:04pm by Daisy*

**AP Physics B**

A penny of mass 3.1g rests on a small 28.2g block supported by a spinning disk of radius 12cm. The coefficients of friction between the block and disk are .73 (static) and .64 (kinetic) while those for the penny and black are .6 (static) and .45 (kinetic). What is the maximum ...
*Friday, November 9, 2012 at 8:56pm by Daisy*

**AP Physics B**

If the system shown in Figure P8.29 is set in rotation about each of the axes mentioned in problem 29, find the torque that will produce an angular acceleration on 1.5 rad/s2 in each case.
*Wednesday, November 14, 2012 at 8:39pm by Rochelle*

**ap physics b**

A uniform ladder 8.09 m long and weighing 201.0 N rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.600, and the ladder makes a 46.0#14; angle with the ground. How far up the ladder can an 834.0N person climb before the ...
*Saturday, November 17, 2012 at 11:04am by helpplz*

**AP Physics B**

A 63.6-kg bungee jumper is standing on a tall platform (h0 = 50.6 m). The bungee cord has an unstrained length of L0 = 9.54 m and, when stretched, behaves like an ideal spring with a spring constant of k = 67.8 N/m. The jumper falls from rest, and it is assumed that the only ...
*Thursday, November 29, 2012 at 3:48pm by Alexis *

**AP Physics B**

potential energy lost in fall = potential energy gained by our perfect cord m g (fall distance) = (1/2) k (stretch distance)^2 63.6(9.81)(fall) = (1/2)(67.8)(fall-9.54)^2 623.9 f = 33.9 (f-9.54)^2 18.4 f = f^2 - 19.1 f + 91.0 f^2 - 19.1 f + 72.6 = 0 f = [ 19.1 +/- sqrt (365 - ...
*Thursday, November 29, 2012 at 3:48pm by Damon*

**AP Physics B**

Thank You So Much!
*Thursday, November 29, 2012 at 3:48pm by Alexis *

**AP physics B**

Thank you!
*Wednesday, December 5, 2012 at 8:36am by Cold Turkey*

**AP physics B**

A phone cord is 3.26 m long. The cord has a mass of 0.224 kg. A transverse wave pulse is produced by plucking one end of the taut cord. The pulse makes four trips down and back along the cord in 0.865 s. What is the tension in the cord? Answer in units of N
*Wednesday, December 5, 2012 at 8:36am by Cold Turkey*

**AP physics B**

The wave speed is V = 8*3.26/0.865 = 30.2 m/s. Cord mass per unit length is sigma = 0.0687 kg/m Wave speed is V = sqrt[T/sigma] Solve for T It will be in Newtons
*Wednesday, December 5, 2012 at 8:36am by drwls*

**AP Physics B**

system consists of a steal beam of mass M 68.4 kg and length L 1.84 m, with a 39.0-kg brass sphere attached at the right end of the rod, as shown below. BA a. Determine the moment of inertia of the system for rotation about an axis through the center of ...
*Tuesday, December 11, 2012 at 6:11pm by Larry*

**AP Physics B**

I have one our part question left that I just don't understand! Please help me!! Part 1 An 11.6 kg block of metal is suspended from a scale and immersed in water as in the ﬁgure. The dimensions of the block are 12.9 cm × 9.7 cm × 9.7 cm. The 12.9 cm dimension is ...
*Tuesday, January 15, 2013 at 8:30pm by Taylor*

**AP Physics B**

A 1.2 kg rectangular air mattress is 2.1 m long, 0.46 m wide, and 0.09 m thick. If it has a mass of 1.2 kg , what additional mass can it support in water?
*Tuesday, January 15, 2013 at 8:32pm by Max*

**AP Physics B**

An empty rubber balloon has a mass of 0.01 kg . The balloon is ﬁlled with helium at a density of 0.181 kg/m3 . At this density the balloon has a radius of 0.493 m . If the ﬁlled balloon is fastened to a vertical line, what is the tension in the line? The ...
*Tuesday, January 15, 2013 at 8:34pm by Clark*

**AP Physics B**

The force at any point is pressure*area pressure=heightwater*densitywater*g
*Tuesday, January 15, 2013 at 8:30pm by bobpursley*

**AP Physics B**

Part 2!!!! An object weighing 305 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 270 N . Immersed in oil, the object appears to weigh 279 N . Find the density of the object. Answer in units of kg/m3
*Tuesday, January 15, 2013 at 8:36pm by Clark*

**AP Physics B**

Through a pipe of diameter 15.5 cm , water is pumped from the Colorado River up to Grand Canyon Village, on the rim of the canyon. The river is at 564 m elevation and the village is at 2096 m . At what minimum pressure must the water be pumped to arrive at the village? The ...
*Wednesday, January 23, 2013 at 7:16pm by Steph*

**AP Physics B**

Two point charges Q1 and Q2, are located a distance .20 meter apart, as shown above. Charge Q1 = +8.0μC. The net electric field is zero at point P, located .40 meter from Q1 and .20 meter from Q2. Determine the magnitude and sign of charge Q2.
*Wednesday, February 6, 2013 at 6:57pm by Alix*

**AP Physics B**

A soap bubble of index of refraction 1.43 strongly reflects both the red and the green components of white light. What minimum film thickness allows this to happen? (In air,the wavelength of red light is 703 nm, of green light 502.143 nm.) Answer in units of nm
*Tuesday, February 19, 2013 at 3:55pm by Daisy*

**AP Physics B**

An object is 21 cm in front of a diverging lens that has a focal length of -10 cm. How far in front of the lens should the object be placed so that the size of its image is reduced by a factor of 1.5?
*Friday, March 15, 2013 at 6:16pm by Alexis*

**AP Physics B**

Got the answer, 36.5 cm
*Friday, March 15, 2013 at 6:16pm by Alexis*

**AP Physics B**

A track consists of a frictionless incline plane, which is a height of 0.5m, and a rough horizontal section with a coefficient of kinetic friction 0.02. Block A, whose mass is 1.5kg, is released from the top of the incline plane, slides down and collides instantaneously and ...
*Friday, August 9, 2013 at 2:17pm by Gwladys*

**AP Physics B**

a. PE = mgh=1.5â€¢9.8â€¢0.5 = 7.35 J b. KE=PE = 7.35 J c. KE = mv²/2 v= sqrt(2â€¢KE/m) = =sqrt(2â€¢7.35/1.5)=3.13 m/s mv + 0 = 2mu u=mv/2m = v/2= 3.13/2 =1.565 m/s d. KE₂=2mâ€¢u²/2 = 2â€¢1.5â€¢1.565²/2 =3.68 J e. KE₂ = W(fr)=F(fr)s =μâ€¢Nâ€¢s = μâ€¢2mgâ€¢s. s= ...
*Friday, August 9, 2013 at 2:17pm by Elena*

**ap physics b**

poop :)
*Saturday, November 17, 2012 at 11:04am by Anonymous*

**PHYSICS**

A bottle containing 4 kgof water at a temperature of 15°Cis placed in a refrigerator where the temperature is kept at 2°C.How much heat is transferred from the water to cool it to 2°C?
*Monday, March 18, 2013 at 7:29pm by B*

**Heat!!! **

Can you please check my answers. My teacher gave me a list of 200 questions to study, but I lost the answer sheet. Can you please help me with these 23 Thanks 1. A silver bar 0.125 meter long is subjected to a temperature change from 200°C to 100°C. What will be the length of ...
*Tuesday, July 5, 2011 at 6:56pm by Brooke *

**physics B**

This is the first question on the 2003 ap physics b exam. I need help with part e. It shows a diagram of a pulley with two students. student A is on the ground with a mass of 70kg holding on to the pulley while student B is in the air with a mass of 60. Question: with what ...
*Wednesday, October 22, 2008 at 7:59pm by kelley*

**algrebra 1**

The area of a rectangle is 128 in². If the length is twice the width, what is the length of the rectangle? A) 64 in. B) 16 in. C) 8 in. D) 4 in. The length of a swimming pool is 22 ft. The width is 40 ft. If the volume of the pool is 2,500 ft³, which equation below could be ...
*Thursday, February 3, 2011 at 1:48pm by AP*

**algebra 1**

Marcos drove twice as far as Candice. Together, they drove 66 miles. Which equation can be used to find the number of miles Candice drove? A) 3x = 66 B) 2x+1/2x=66 C) 3x = 66 + x D) 3x=66-x
*Thursday, February 3, 2011 at 1:46pm by AP*

**algrebra 1**

A secretary at the police department makes $8 less per hour than the dispatcher. The combined hourly wage of the secretary and the dispatcher is $40. Which equation could be used to find the hourly wage of the dispatcher? A) 2x + 8 = 40 B) 2x − 8 = 40 C) 8 − 2x = ...
*Thursday, February 3, 2011 at 1:47pm by AP*

**algrebra 1**

A 180 ft long board is cut into 3 pieces. The second piece of board is twice as long as the first. The third piece of board is six times as long as the first. What is the length of the first piece of the board A) 20 ft B) 40 ft C) 60 ft D) 120 ft
*Thursday, February 3, 2011 at 1:47pm by AP*

**AP Physics**

When traveling a highway in the mountains, you may see elevation signs that read "914 m (3000 ft)". Critics of the metric system claimt hat such numbers show the metric system is more complicated. How would you alter such signs to be more consistent with a switch to the metric...
*Wednesday, June 10, 2009 at 7:59pm by AP Physics*

**AP Physics**

wow ok thanks I thought it was more complicated thanks!
*Wednesday, June 10, 2009 at 7:59pm by AP Physics*

**AP Physics**

Using what's only in chapter one The Nature of Science Models, Theories, and Laws Measurement and Uncertainty; Significant Figuers Units, Standards, and SI System Converting Units Order of Magnitude: Rapid Estimating Dimensions and Dimensional Analysis How am I suppose to ...
*Wednesday, June 10, 2009 at 8:25pm by AP Physics*

**AP Physics**

Again Chapter one Stuff... Discuss how the notion of symmetry could be used to estimate the number of marbles in a one-liter jar. I'm lost I'm thinkthing somewer along the lines of counting them up nice and simple but I have no idea
*Wednesday, June 10, 2009 at 8:29pm by AP Physics*

**AP Physics**

I posted questions down below about chapter 1 aparently they were missed.
*Wednesday, June 10, 2009 at 9:59pm by AP Physics*

**AP Physics**

Hello I was trying to find the proof of the formula x = x0 + v0t +.5at^2 were the zeros are subscripts My text book dosen't explain it that well. ok well it involves the formula for average velocity aver velocity = 2^-1(v0 + v) were the zero is a subscript and this is just ...
*Saturday, June 13, 2009 at 7:48pm by AP Physics*

**AP Physics**

I FIGUERED IT OUT THANKS
*Saturday, June 13, 2009 at 7:48pm by AP Physics*

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