Search: AP Physics B (Heat Engines)

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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

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

Physics
Which of these types of motors or engines are heat engines? a. an automobile engine b. an electric motor c. a steam turbine
Sunday, January 2, 2011 at 10:46pm by Anonymous

Physics
Which of these types of motors or engines are heat engines? a. an automobile engine b. an electric motor c. a steam turbine
Tuesday, December 28, 2010 at 12:33pm by Sylvia

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 ...
Saturday, March 6, 2010 at 10:32pm by drwls

Physics
Heat engines produce mechanical or electrical energy from heat. That excludes electric motors from consideration. A steam turbine can in some cases be one PART of a heat engine, but a burner, geothermal source or nuclear reactor would have to be part of the complete heat ...
Sunday, January 2, 2011 at 10:46pm by drwls

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

Physics (Heat Engines)
wait no the answer is A how though?
Saturday, March 6, 2010 at 10:32pm by Kate

AP Physics
Specific heat = =(heat added)/[temperature change)*mass)] = 290 J/[5.7 C *47 g] = 1.082 J/(C g)
Wednesday, December 2, 2009 at 11:59pm by drwls

SCIENCE
A steady-state heat engine that absorbs 8000 J from a high-temperature reservoir and rejects 1000 J to a cold heat sink would produce 7000 J of work. There would be no other place for the energy to go. The heat engine efficiency would be 87.5%. I know of no heat engines that ...
Thursday, August 18, 2011 at 12:36am by drwls

Physics
First get the maximum possible efficiency from the Carnot cycle formula (Wout)/(Qin) max = 1 - (Tin/Tout) = 1 - (350/650) = 46.2% That efficiency applies to the work out per cycle or the average power divided by the heat transfer rate in. You want power out, so compute the ...
Sunday, July 18, 2010 at 8:45am by drwls

Physics
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 10:11pm by Kate

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

physics
b. Bob Pursley's equation only applies for Carnot cycle engines. Real engines are not built that way. Stirling cycle engine are supposed to come close. In your case, you should use the actual work out and heat out data. Wout (per cycle) = Qin - Qout = 490 J Efficiency = ...
Sunday, January 1, 2012 at 9:39am by drwls

physics(mechanics)
how does the engines get cooled when the vehicle moves in a hill ramp.?i ask this question because its said that cooling fans are drived by the rotation of the engines sothat the cooling fans are mounted in the engine casing.If thats is the case then at ramps engine run slowly...
Saturday, May 11, 2013 at 11:14pm by NANDHU

AP CHEM
You have the mass of the water to be frozen, figure the heat lost to convert it to ice at -5C. You will have to watch units, on the heat of fusion, convert that to J/g. Then, the heat lost has to equal the heat gained, or Massfreon*Heatvap= heat lost
Wednesday, January 2, 2008 at 9:12pm by bobpursley

physics
In December of 1989, a KLM Boeing 747 airplane carrying 231 passengers entered a cloud of ejecta from an Alaskan volcanic eruption. All four engines went out, and the plane fell from 27800 ft to 13700 ft before the engines could be restarted. It then landed safely. how long ...
Thursday, January 19, 2012 at 2:13pm by Amy

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...
Sunday, August 9, 2009 at 9:12pm by physics

ap chemistry
heat evolved = q = mass H2O x specific heat H2O x (Tfinal-Tinitial) heat/g = q/3.5
Wednesday, October 31, 2012 at 5:31pm by DrBob222

physics
What is being done to reduce emissions from gasoline engines in automobiles? What more can be done in the future? Do you think gasoline engines will become a thing of the past?
Thursday, September 23, 2010 at 12:39pm by Anonymous

chemistry
how do reciprocating heat engines work?
Thursday, February 11, 2010 at 3:26am by alex

AP chemistry
The problem is the heat of solution, which affects measurements. So technically, the heat of formation of the acid in solution is the same as liquid, but if you are measuring or calculating heats, you have to add in the heat of solution to the equation.
Sunday, November 6, 2011 at 10:06am by bobpursley

AP Chemistry
Do you have specific heat water? ice? heat fusion?
Wednesday, January 23, 2013 at 5:01pm by DrBob222

Chemistry AP help
heat lost by tungsten + heat gained by water = 0 Is that hint good enough?
Saturday, February 9, 2008 at 5:54pm by DrBob222

physics
The hot reservoir for a Carnot engine has a temperature of 926 K, while the cold reservoir has a temperature of 441 K. The heat input for this engine is 3730 J. The 441-K reservoir also serves as the hot reservoir for a second Carnot engine. This second engine uses the ...
Saturday, December 1, 2012 at 6:53pm by angie

PHYSICS
In December of 1989, a KLM Boeing 747 airplane carrying 231 passengers entered a cloud of ejecta from an Alaskan volcanic eruption. All four engines went out, and the plane fell from 27800 ft to 13700 ft before the engines could be restarted. It then landed safely in Anchorage...
Thursday, January 19, 2012 at 12:58pm by Amy

Physics
In December of 1989, a KLM Boeing 747 airplane carrying 231 passengers entered a cloud of ejecta from an Alaskan volcanic eruption. All four engines went out, and the plane fell from 27800 ft to 13700 ft before the engines could be restarted. It then landed safely in Anchorage...
Tuesday, January 17, 2012 at 6:12pm by Amy

Math
Hiroshi has 4 engines and 18 box cars. Find the ratio of engines to box cars. Write the ratio as a fraction in simplest form. Then explain its meaning. 2/9? 2 engines to 9 box cars? Am I explaining what their meanings are correctly?
Friday, November 16, 2012 at 9:38pm by Jerald

AP Physics
A student found an unknown substance. In an effort to identify the thermal properties of the substance, she isolated a specimen of 47 gram, and applied 290 J of heat energy to the specimen. If she measured the temperature of the specimen changed from 20 ° C to 25.7 ° C...
Wednesday, December 2, 2009 at 11:59pm by Sasami

ap chemistry
exo means it get hotter (givs off heat). endo means it gets cooler (absorbs heat).
Friday, September 24, 2010 at 9:29pm by DrBob222

ap chemisty
Calculate the heat of formation of butane given that the heat of formation of H20(l) is -285.3 kj/mol and the heat of formation of CO2(g) is -393.5 kj/mol.
Friday, September 24, 2010 at 5:30pm by Sarah

AP chemistry
The specified heat capacity of silver is 0.24 J/C.g. Please help with this Ap chem quastion.? a. Calculate the energy required to raise the temperature of 150.0 g Ag from 273 K to 298. b. Calculate the energy required to raise the temperature of 1.0 mol Ag by 1.0C (called the ...
Saturday, October 23, 2010 at 4:31pm by Nardos

physics
I will be happy to critique your thinking. Add the following heats: heat to melt ice heat to warm water to 100C heat to change water to steam heat to heat steam to 150C
Thursday, April 21, 2011 at 12:39am by bobpursley

chemistry AP
No. It takes energy (heat) to evaporate the water that appears on the skin when we sweat. Taking heat away from the body is cooling the body.
Tuesday, January 29, 2008 at 8:31pm by DrBob222

AP Chemistry
mass A x specific heat A x delta T mass B x specific heat B x delta T. Calculate heat capacity of each and compare.
Thursday, December 2, 2010 at 11:33pm by DrBob222

ap chemistry
When sweat evaporates, heat is removed from the skin. That heat energy givewn up by the skin is needed to covert water from a liquid to a vapor.
Tuesday, January 29, 2008 at 6:40pm by drwls

Physics
Heat lost by spoon = heat gained by water Use that heat, the aluminum temperature drop, and the specific heat of aluminum to get the mass. Ignore the styrafoam mass. It acts as an insulator to keep the heat inside, and weighs very little.
Saturday, May 7, 2011 at 12:56am by drwls

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

chemistry
Ethanol's boiling point is too low for use in automobile engines. Ethylene glycol doesn't have the specific heat capacity that water has.
Tuesday, February 8, 2011 at 9:37am by DrBob222

Physics
sorry to repost (again) but I'm not understanding how to solve this: A rocket is launched at an angle of 42◦ above the horizontal with an initial speed of 76 m/s. It moves for 9 s along its initial line of motion with an acceleration of 29 m/s^2. At this time its...
Monday, September 6, 2010 at 11:48pm by John

Thermochemistry Ap Chem homework
(10.0 g water) (delta 20 degrees C)(4.184J/g x C) = 836.8 J needed to heat the water. You just forgot to multiply the specific heat.
Monday, November 15, 2010 at 5:58pm by John

Physics
A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 2.1 105 N. In being launched from rest it moves through a distance of 87 m and has a kinetic energy of 3.8 107 J at lift-off. What is ...
Saturday, November 13, 2010 at 8:46am by Patty

Math
3/8 * 40 = 120/8 = 15 If you post your answers to these questions, we'll be glad to check them. How many engines were in each part? How many parts could climb the hill? How many engines could climb the hill? How many parts could not climb the hill? How many engines could ...
Tuesday, March 23, 2010 at 5:00pm by Ms. Sue

Physics
There may be friction in a hydraulic jack, and a bit of heat produced, but that does not make it a heat engine. A heat engine converts heat to mechanical energy. None of the things on your list do that.
Sunday, January 2, 2011 at 11:38pm by drwls

Physics
A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 3.82 x 105 N. In being launched from rest it moves through a distance of 57.2 m and has a kinetic energy of 5.71 x 107 J at lift-off. ...
Friday, December 14, 2012 at 9:43pm by Ricardo

Physics
A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 2.10 105 N. In being launched from rest it moves through a distance of 87 m and has a kinetic energy of 4.30 107 J at lift-off. What is...
Sunday, November 11, 2012 at 6:35am by Donald

Physics
all HELP appreciated! Thank You! A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 2.1 105 N. In being launched from rest it moves through a distance of 87 m and has a kinetic energy of...
Monday, October 19, 2009 at 7:29pm by Pablo

Physics
figure this in three parts: heat to heat water from 25C to 100C heat to vaporize water at 100C heat to heat steam from 100C to 120C add them
Thursday, November 18, 2010 at 8:46pm by bobpursley

Physics
A space probe has two engines. Each generates the same amount of force when fired, and the directions of these forces can be independently adjusted. When the engines are fired simultaneously and each applies its force in the same direction, the probe, starting from rest, takes...
Wednesday, February 13, 2013 at 7:59pm by Randy

Physics
How much heat is added to a 10.0 g of ice at -20.0 degrees Celsius to convert it to steam at 120.0 degrees Celsius? compute and add the following heats: heat to heat ice from -20C to 0C heat to melt ice at 0C Heat to heat water from 0 to 100C heat to convert water to steam at ...
Monday, March 5, 2007 at 7:45pm by Marie

physics
A space probe has two engines. Each generates the same amount of force when fired, and the directions of these forces can be independently adjusted. When the engines are fired simultaneously and each applies its force in the same direction, the probe, starting from rest, takes...
Tuesday, October 12, 2010 at 3:50pm by deanna

Math
3/8 of the 40 little engines could climb the hill. How many engines were in each part? How many parts could climb the hill? How many engines could climb the hill? How many parts could not climb the hill? How many engines could not climb the hill?
Tuesday, March 23, 2010 at 5:00pm by Malory

Physics
1. On a spacecraft, two engines are turned on for 648 s at a moment when the velocity of the craft has x and y components of v0x = 4360 m/s and v0y = 6270 m/s. While the engines are ﬁring the craft undergoes a displacement that has components of x = 4.11 × 106...
Monday, October 1, 2012 at 11:28pm by Thomas

physics
A fighter jet is launched from an aircraft carrier with the aid of its own engines and a steam-powered catapult. The thrust of its engines is 2.4 x 10^5 N. In being launched from rest it moves through a distance of 87 m and has a kinetic energy of 5.0 x 10^7 J at lift-off. ...
Wednesday, October 15, 2008 at 9:25pm by nj

AP Chemistry
[mass metal x specific heat metal x (Tfinal-Tinitial)] +[(mass water x specific heat water x (Tfinal-Tinitial)] = 0 Solve for specific heat metal, the only unknown in the equation. The first set of brackets is the loss of heat from the metal, the second set of brackets is the ...
Monday, February 15, 2010 at 3:04pm by DrBob222

AP Physics
You go to kitchen to boil water. You pour 280 gram of water to a container, and put the container on a 293 W electric heater. Assume that all the heat from the heater is used to heat the water. The specific heat of water is 4.19 J/g ° C. As always, be accurate to 4 ...
Thursday, December 3, 2009 at 12:23am by Sasami

AP Physics ???
This is AP Physics? C = pi * d C = 3.14 * 11 C = 34.54 cm = 0.3454 m
Sunday, August 1, 2010 at 6:15pm by Ms. Sue

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
(a) You want to heat the water delta T = 100-21.6 = 78.4 degrees. The energy needed is Q = C M *delta T = 4.19*280*78.4 = 91,980 joules Power*Time = 91,980 Time (in seconds) = 91,980/293 = 314 s Convert that to minutes. (b) After that length of time, additional heat added is ...
Thursday, December 3, 2009 at 12:23am by drwls

AP Physics
How could you possibly take AP physics without know hot to rearrange a formula as simple as this?
Sunday, August 1, 2010 at 6:12pm by Mike

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

physics
The efficiency of the first Carnot engine is 1 - (441/926) = 0.5238 The work out of that engine is 3730*0.5238 = 1954 J The heat output of that engine is 3730-1954 = 1776 J. That heat is the input to the second engine. The second engine's efficiency is 1 - (191/441) = 0....
Saturday, December 1, 2012 at 6:53pm by drwls

AP physics
Yes, we will be glad to help you with AP physics. Please post one problem at a time.
Sunday, January 27, 2008 at 9:02am by drwls

Physics
heat in = mass * heat capacity * change in temp 3.5*10^4 = 2.3* heat capacity*(T-39) I am not about to look up the heat capacity of iron in Joules/kgdegK. It is in your book
Wednesday, June 20, 2012 at 3:10pm by Damon

ap chem
calculate the enthalpy of formationof solid MgOH2, given the following data: 2Mg(s) + O2(g)-> 2MgO(s) heat:-1203.6 Mg OH2(s) -> MgO(s) +H2O(l) heat: 37.1 2H2(g)+ O2(g) -> 2H2O(l) heat: -571.7 what equation would they want the three equations to develop ...
Thursday, October 4, 2007 at 6:53pm by lily

AP Physics
These are all like grade nine and ten questions. How can this possibly be AP physics?! If you think this course will prepare you for university physics you are in for a surprise. If you can't do questions this simple, you will fail... indefinitely.
Sunday, August 1, 2010 at 6:15pm by Mike

AP Chemistry
(mass ice x heat fusion) + (mass H2O x specific heat H2O x delta T) = ?
Sunday, September 23, 2012 at 6:18pm by DrBob222

physics
Any gas will absorb heat if you heat it up. The added heat makes the molecules move faster.
Tuesday, February 23, 2010 at 1:21am by drwls

Physics
Find the heat necessary to change 2.5kg of water (ice) at -2 degrees C to steam at 105 degrees C. specific heat ice= 2060 specific heat water= 4180 specific heat steam= 2020 heat of fusion= 3.34X10^5 heat of vaporization= 2.26X10^6
Thursday, November 18, 2010 at 8:49pm by Brittany

ap chemistry
q1 = heat to melt ice at zero C to water at zero C. q1 = mass ice x heat fusion. q2 = heat to move from zero C to 25 C. q2 = mass water x specific heat water x delta T. q total = q1 + q2 I don't see the right answer listed. Perhaps you made a typo in answer c.
Friday, September 24, 2010 at 8:22pm by DrBob222

ap chemisty
Thank you. there is also a second part. B.) assuming that all the heat evolved in burning 30 g of butane is transferred to 8 kg of water at 22.2 degrees celsius (specific heat=4.184 J/gxK), calculate the final temperature of the water.
Friday, September 24, 2010 at 5:30pm by Sarah

AP Physics
i'm in ap physics too and we do WAY more complicated stuff than that.
Sunday, August 1, 2010 at 6:15pm by Lauren

univ. physics
A heat pump has a coefficient of performance of 4.5. If the heat pump absorbs 46.1 cal of heat from the cold outdoors in each cycle, what is the amount of heat expelled to the warm indoors? (in cal)
Thursday, December 13, 2012 at 5:21pm by kate

physics
Heat to do what? expand it a certain length? heat it to a certain temperature? If you are just looking at heat content for a specific temperature change, heat is directly proportional to mass, which is directly related to volume. heat then equals 1/4 of the original. But I ...
Tuesday, July 3, 2012 at 7:19am by bobpursley

AP Chemistry
At least theoretically the heat released to the surrounding/g will be the as released to the body on combustion. I don't know how efficient the body is at metabolizing this material. trien... + O2 ==> CO2 + H2O + heat. Plug in the formula and you can balance the C, ...
Monday, January 21, 2013 at 12:11pm by DrBob222

AP Chemistry
heat lost + heat gained = 0 [mass Ni x specific heat Ni x (Tf - Ti)] + [mass water x specific heat H2O x (Tf - Ti)] = 0. Tf is final T. That is given as 37.2. Ti is the initial T. Solve for that. You are given mass Ni and mass water. Also you are given specific heat Ni and ...
Thursday, October 4, 2007 at 4:14pm by DrBob222

physics
A heat pump has a coefficient of performance of 4.5. If the heat pump absorbs 46.1 cal of heat from the cold outdoors in each cycle, what is the amount of heat expelled to the warm indoors? (in cal) tried everything but got nothing.
Monday, December 17, 2012 at 12:00pm by jimmy

9th grade
add the following energyies: heat to heat ice at -10 to 0 heat to melt 20 g ice at 0C Heat to heat water from 0C to 100C heat to vaporize 20gwater at 100C. heat to heat steam from 100C to 200C
Tuesday, January 5, 2010 at 6:46pm by bobpursley

Chemistry 2 ap
Yes. I wondered if confuded was a new word I should learn. I think the problem is a stoichiometry problem IF you know the heat of combustion. Do you know that? If so, then C3H8 + 5O2 ==> 3CO2 + 4H2O So it takes 44 g C3H8 to generate ??kJ (the heat of combustion ...
Thursday, October 28, 2010 at 2:48pm by DrBob222

Physics
The potential energy becomes heat, Q. Use the heat to compute the temperature rise. Delta T = Q/(M*C) = (1/2)M g H/(M*C) = (1/2)g H/C C is the water specific heat, 4180 joules/kg C
Tuesday, June 28, 2011 at 12:39am by drwls

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

ALL OF JISHKA STAFF
Hello I had a couple of questions and was woundering if you have staff members that are teaching or have taught AP BIOLOGY AP PHYSICS B AP CALCULUS AB AP CHEMISTRY I was told that the AP BIOLOGY teacher had gotten extremly ill =(, has he come back? Also can you tell me if you ...
Thursday, August 19, 2010 at 2:07pm by Kate

Physics
a. heat= 200g*1cal/gC * 60C b. heat=power*time time= heat/power= above heat/power. Well, at this point, you have to change calories to joules, as 50watts=50joules/sec
Friday, July 2, 2010 at 6:19pm by bobpursley

AP Physics
Lisa: I assume this is a summer packet to insure you are ready for AP Physics. This particular question is Algebra I. If you cannot do this, or the others, I strongly recommend you discuss with your parents your readiness for college level work.
Sunday, August 1, 2010 at 6:12pm by bobpursley

Probabilities
Company has 90 cars in stock with 4 cylinder engines and 290 with 6 cylinder engines. There are no other cars in stock. 130 of these cars, including 20 of those with 4 cylinder engines have air conditioning. One car on the lot is selected at random. The probability that this ...
Tuesday, April 21, 2009 at 2:05pm by Andrey L

Physics
The heat of fusion is 80 cal/g = 335 J/g The specific heat of ice 2.11 J/g*degC To heat the ice to 0 C requires 2000 g * 8 C *2.11 J/c*C = 33,760 J There is more than enough heat to melt all of the ice.
Tuesday, May 10, 2011 at 8:20pm by drwls

AP Chemistry
q = mass x heat vaporization = ?? Convert 355 g NH3 to mols and plug in for mass. heat of vaporization is in kJ/mol. The answer will be in kJ. Note the correct spelling of Celsius.
Friday, April 4, 2008 at 10:18am by DrBob222

Statistics
A company has two factories in which they manufacture engines. Once a month they randomly select 10 engines from each factory and test if there is a difference in performance in engines made in the two factories. This month the average output of the motors from Factory 1 is ...
Monday, June 18, 2012 at 10:55pm by Mike

AP Chemistry
Microwave ovens emit microwave radiation that is absorbed by water as heat. Suppose that the wavelength of the radiation that is 12.5 cm in an oven that has a power rating of 900 watts. (1W = 1 J/s) a) How many moles of photons are released per minute b) how long will it take ...
Tuesday, November 16, 2010 at 11:21pm by qwerty123

ap chemistry
the heat of neutralization for a strong acid in dilute water solution is about 60 kJ/mol of H+. What quantity of heat in kJ is produced when 100 mL of 3 M HCl is mixed with 100 mL of 1 M KOH?
Friday, September 24, 2010 at 9:26pm by Sarah

AP Chemistry
The total heat released from steam to liquid, and then ice was: 1.5 + 114 + 21 + 17 = 153.5 kJ That is less than the total heat released of 156 kJ. That is more than enough evidence to confirm (or not) your suggestion.
Friday, November 28, 2008 at 11:25pm by GK

Physics
Acceleration is not increasing with engines on. It is constant. When the engines are on, Y = 76 sin42 t + (1/2)(29 sin 42)t^2 X = 76 cos42 t + (1/2)(29 cos 42)t^2 Use t = 9 s to find out the location and speed at burnoout. Then write a new equation for the position after that...
Monday, September 6, 2010 at 11:48pm by drwls

Science/Physics
The nerves in our skin do not sense temperature, they sense heat flow. If heat flow is great, we sense it as hot. If heat flow is outward, we sense it as cold. The seat has stored little heat, so touching it wont get much heat flow. The windshield actually has stored more heat...
Friday, December 9, 2011 at 6:18pm by bobpursley

physics
A 1560 rocket is to be launched with an initial upward speed of 53.0 . In order to assist its engines, the engineers will start it from rest on a ramp that rises 53 above the horizontal (the figure ). At the bottom, the ramp turns upward and launches the rocket vertically. The...
Wednesday, December 14, 2011 at 9:38am by Anonymous

PHYSICS'S
you have three parts: a. Heat the water to 100C b. vaporize the water at 100C c. heat the steam to 110C a. heat=m*cwater*(100-20) b. heat=m*Hv c. heat=m*csteam*(110-100) cwater is specific heat capacity of water Hv is the heat of vaporization of water. Csteam is specific heat ...
Sunday, March 31, 2013 at 6:28pm by bobpursley

physics
heat lost by ice=MLf =22*3.34*10^5 J =7348000 J since heat gained =heat lost 7348000 joules of heat energy is absorbed by the ice box.
Saturday, November 20, 2010 at 10:06am by sanjeet

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