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April 16, 2014

# Search: A 89-g ice cube at 0&Acirc;&deg;C is placed in 668 g of water at 28&Acirc;&deg;C. What is the final temperature of the mixture?

Number of results: 47,059

mangement science the art of modeling w/ spreadshe
Five years ago, an automobile manufacturer started offering an extended warranty to buyers of its sport-utility vehicle.Â Â The extended warranty covered defects occurring after the initial three-year warranty expired.Â Â Of the 10,...
Sunday, February 20, 2011 at 4:58am by melissa

physics
A container of hot water at 80 deg C cools to 79 deg C in 15 seconds when it is placed in a room that is at 20 deg C. Use Newton's law of cooling to estimate the time it will take for the container to cool from 70 deg C to 69 deg C.
Wednesday, October 19, 2011 at 5:41pm by Dave

physics
A container of hot water at 80 deg C cools to 79 deg C in 15 seconds when it is placed in a room that is at 20 deg C. Use Newtons law of cooling to estimate the time it will take for the container to cool from 70 deg C to 69 deg C.
Wednesday, October 19, 2011 at 7:46pm by Dave

Chemistry
Ho much energy is needed to change a 50 g ice cube at 0 deg C to a liquid water at 100 deg. C?
Tuesday, February 23, 2010 at 5:44pm by Christopher

algebra
If it reads 28°F, and it cannot be more than 1.2° from the ambient temperature, then the range is between (28-1.2)°F and (28+1.2)°F
Thursday, August 30, 2012 at 8:01pm by MathMate

Physics
Consider a piece of metal that is at 5 deg C. If it is heated until it has twice the internal energy, its temperature will be. a)556 deg C b)283 deg C c)273 deg C d)278 deg C e)10 deg C
Monday, November 19, 2012 at 11:51am by S

Phase Changes
The heat of fusion of water is 335 J/g, the heat of vaporization of water is 2.26 kJ/g, the specifc heat of ice is 2.05 J/deg/g, the specific heat of steam is 2.08 J/deg/g and the specific heat of liquid water is 4.184 J/deg/g. How much heat would be needed to convert 10.73 g ...
Wednesday, May 8, 2013 at 12:41pm by Jenny

chemistry
the heat of fusion water is335 J/g. The heat of evaporization of water is 2.26 kJ/g, the specific heat of ice is 2.05 J/Deg/g, the specific heat of steam is 2.08 J/deg/g and the specific heat of liquid water is 4.184 J/deg/g. How much heat would be needed to convert 12.09 g of...
Tuesday, April 24, 2012 at 10:31pm by Randy

Physics
Follow the following steps: 1. Calculate the ice block's mass from its volume and density. 2. Compute heat required to raise its temp. from -19.3 degC to 0 deg - Q1 3. Consider latent heat required to change the state from ice at 0 deg. to water at 0 deg. - Q2 3. Compute heat ...
Tuesday, July 31, 2012 at 8:08pm by Ajayb

Discrete Math
Perfect! I forgot to mention that the expression f°g°h is associative, which means that you can evaluate it as f°(g°h) or (f°g)°h. This is why the parentheses have been left out. If you want extra practice, try both and verify the associativity.
Tuesday, February 15, 2011 at 2:53pm by MathMate

Discrete Math-correction
g ° h ={(1,2), (3,1), (1,2), (4,3)} is not correct. I went too fast. (g°h)(1)=g(h(1))=g(1)=2 (g°h)(2)=g(h(2))=g(3)=1 (g°h)(3)=g(h(3))=g(1)=2 (g°h)(4)=g(h(4))=g(3)=1 So g°h : {(1,2),(2,1),(3,2),(4,1)} Hope you're ready to try h²!
Tuesday, February 15, 2011 at 2:53pm by MathMate

Triggggggg
"90 miles south and 20 miles east of port" means the direction along which the ship must sail is: x=-90, y=20 angle = atan(20,-90) = 180° - 12°-31'-44" = 167°-28'-16" (in trigonometry notation). To convert trigonometry notation to bearing, subtract angle from 90&...
Thursday, April 28, 2011 at 10:27pm by MathMate

Vectors/Magnitude
Depending on whether the vector makes 12.8° with the horizontal or vertical, the vertical component is 89.7sin(12.8°) or 89.7cos(12.8°) respectively.
Sunday, April 22, 2012 at 5:04pm by MathMate

Physics
Assume a thermal equilibrium temp. T and find the heat absorbed by ice (say Q1)to raise its temp.from -35 deg. to T deg. Similarly, find heat released by water (say Q2) when its temp. lowers from 45 deg. to T deg. Putting Q1 = Q2 will give you T in deg. C. Note: Do not forget ...
Tuesday, July 31, 2012 at 8:09pm by Ajayb

physics
500g of water at 40 deg C and 200g of a mixture of ice and water are combined. The final temperature is 10 deg C. How much of the original 200g mixture was ice?
Saturday, February 23, 2008 at 12:55pm by shan

Chemistry
Determine the resulting temperature when 150 g of ice at 0 deg.C is mixed with 300 g of water at 50 deg C.
Tuesday, February 23, 2010 at 5:45pm by Stacie

chemistry
The range from the freezing temperature of water to the boiling point of water is as follows: Fahrenheit: 32 to 212 deg., a range of 180 degrees Celsius: 0 to 100 deg., a range of 100 degrees Kelvin: 273 to 373 deg., a range of 100 degrees So ... if we are talking about ...
Saturday, August 30, 2008 at 2:55am by GK

math
To find the coterminal angle, you can subtract or add 360° until the angle is between 0 and 360°. For example, 361° is more than 360° so we subtract 360° to get 1°. Since 1° is between 0 and 360°, it is the coterminal angle with 361°. You ...
Monday, October 26, 2009 at 10:43am by MathMate

Chemistry
At constant pressure, the volume of a fixed quantity of gas is proportional to the temperature, measured in °K. To convert °C to °K, add 273.15. So 20°C = 293.15°K, and 30°C = 303.15°K. New volume =1.00*10³*(303.15/293.15) =?
Thursday, September 23, 2010 at 11:26am by MathMate

maths/physics/biomechanics
4m/s @ 180 Deg + 2m/s @ 45 Deg. X = 4*cos180 + 2*cos45 = -2.586 m/s. Y = 0 + 2*sin45 = 1.414 m/s. tanAr=Y/X = 1.414 / -2.586 = -.054687, Ar = -28.7 Deg. = Reference angle. A=-28.7 + 180=151.3 Deg.,CCW= W28.7Deg N. V = X/cosA = -2.586 / cos151.3 = 2.95 m/s @ W28.7Deg.N. d = 2....
Thursday, February 9, 2012 at 5:12pm by Henry

physics
Let x=east, y=north and 0° towards the +x-axis (due East) and 90° = due north. Separate each displacement into the x- and y-components and add. distance angle x y 75m N=90° 75cos(90°) 75sin(90°) 260m E=0° 260cos(0) 260sin(0) 195m 30°N of E = 30°...
Sunday, September 20, 2009 at 10:43pm by MathMate

Chemistry
What is the final temperature when 50.0 g of Chromium at 15 deg. C (specific heat of Cr = 0.107 cal/g-deg.) is added to 25 ml of 45 deg.C water?
Tuesday, February 23, 2010 at 6:44pm by Mary

Physics - calorie
The trick is in the definition of specific heat, which is cal/(g-°C). Let's look at the units for : cm(T change) = Q c=cal/(g-°C) m=g T change = °C So the units of Q should be: cal/(g-°C) * g * °C =cal Note: g and °C cancel out to leave calories.
Sunday, September 20, 2009 at 4:45pm by MathMate

chemistry
To treat a burn on your hand, you decide to place an ice cube on the burned skin. The mass of the ice cube is 16.0 g, and its initial temperature is -10.4 °C. The water resulting from the melted ice reaches the temperature of your skin, 28.3 °C. How much heat is absorbed by ...
Thursday, April 25, 2013 at 12:32am by Audre

Discrete Math
Sorry to join in the discussion. It all comes to the basic definition: g°f is read as "g of f", just like g(x) is read as g of x, or f(x) is f of x or function of x. so g°f=(g*deg;f)(x)=g(f(x)) which explains why f(x) has to be evaluated first before g. If you say F&...
Saturday, February 19, 2011 at 9:34am by MathMate

Discrete Math
Sorry to join in the discussion. It all comes to the basic definition: g°f is read as "g of f", just like g(x) is read as g of x, or f(x) is f of x or function of x. so g°f=(g°f)(x)=g(f(x)) which explains why f(x) has to be evaluated first before g. If you say F&...
Saturday, February 19, 2011 at 9:34am by MathMate

Math
0° latitude is the equator. So from 32S to 0° is 32 degrees. From the equator (0°)to 45°N is 45°. The total is therefore 32+45=77°.
Wednesday, April 20, 2011 at 3:38pm by MathMate

Taylor
To treat a burn on your hand, you decide to place an ice cube on the burned skin. The mass of the ice cube is 12.6 g, and its initial temperature is -10.4 °C. The water resulting from the melted ice reaches the temperature of your skin, 28.1 °C. How much heat is absorbed by ...
Friday, November 15, 2013 at 4:24pm by Aubrey

Physics
I'm trying to determine the specific heat of copper by experiment and I have a question about the change in temperature of the copper. If I take the copper out of boiling water at 100 deg. C and place it in water at 10 degrees C, the temp. of the water increases to 14 deg. Is ...
Thursday, May 7, 2009 at 3:26pm by Brigid

math
7u^4 + 4v^2 + w^5. I'm assuming we have 3 terms. The deg. of this expression is = the highes deg.term. W has the highest deg. Therefore, the deg. of the expression is 5.
Tuesday, July 13, 2010 at 12:34pm by Henry

math
*"Fahrenheit", it's not an easy-to-spell word, but we have to learn to spell it correctly. 1:00 pm 88° 8:00 am (88-12)=76° (12° cooler than 1pm) 4:00 am (76-6)=70° (6 ° cooler than 8am) midnight (70+7)=?° (7° warmer than 4am)
Sunday, May 1, 2011 at 6:31pm by MathMate

chemistry
x = grams of ice x times heat of fusion of water in cal/gram = grams of water * specific heat of water in cal/deg gm * (25-5) ------------ That assumes that the ice is separated from the water. If they mix then the ice not only has to melt but also be raised from 0 to 5. Then...
Wednesday, January 27, 2010 at 3:10pm by Damon

Chemistry
How much heat is required to change 10 grams of ice at 0 deg. C to steam at 100 deg C?
Tuesday, February 23, 2010 at 8:04pm by Ally

Chemistry
How much heat is required to change 10 g of ice at 0o deg C to steam at 100 deg. C?
Tuesday, February 23, 2010 at 8:05pm by Mari

Chemistry
how much heat is needed to convert 966g of ice at -10 deg C to steam at 126 deg C
Wednesday, June 22, 2011 at 2:13am by TC

Physics
how much heat energy needed to convert 125g ice 27 deg C to 50 deg C
Thursday, January 31, 2013 at 11:23am by Zach

phy
A cube of ice is taken from the freezer at -7.5°C and placed in a 101 g aluminum calorimeter filled with 282 g of water at room temperature of 20°C. The final situation is observed to be all water at 16°C. What was the mass of the ice cube?
Thursday, December 2, 2010 at 9:38pm by ami

physics
A cube of ice is take from the freezer at -8.5C and placed in a 95g calorimeter aluminum cup containing 310g of water at 20degC. The final situation is observed to be all water at 17degC. What was the mass of the ice cube?
Sunday, April 24, 2011 at 1:45pm by Mark

Chemistry
In order to raise the temperature of 5.0 Kg of water from 20 deg. C to 30 deg. C, a 2.0 kg iron bar is heated and then dropped into the water. What should the starting temperature of the bar be? (Specific heat Fe is 0.22 cal/g-deg.)
Tuesday, February 23, 2010 at 8:02pm by Lexie

science
You freeze 92g of water, and it becomes a cube of ice. a. What is the mass of the ice cube? b. The cube's volume os 100cm3. What is it's density? c. Will the ice cube float or sink in water?
Friday, December 7, 2012 at 11:35am by Max

physics
Vb=25km/hr @ 90 deg. = Velocity of boat Vw = 10km/hr @ 330 deg. = Velocity of water. X = hor. = 10cos330 = 8.66km/hr. Y = ver. = 25 + 10sin330 = 20km/hr. tanA = Y / X = 20 / 8.66 = 2.3094. A = 66.6 deg. R=X / cosA = 8.66 / cos66.6=21.8km/hr @ 66.6 deg.=21.8km/hr @ 66.6 deg ...
Sunday, September 4, 2011 at 6:59am by Henry

trigo
The pilot travels 200 miles S at 20 deg.-20 min. When he changes direction, he makes a 90 deg angle (20 deg.-20min.) + (69deg.-40 min.) = 90 Deg. During his return path, he completes the rt. triangle. TanA = 200/148 = 1.3514, A = 53.5 deg. B = 90 - 53.5 = 36.5 deg. = 36 Deg,...
Tuesday, August 3, 2010 at 6:39am by Henry

Chemistry
Calculate the heat (in kJ) required to change 40.0g of ice at -30.0 deg C to steam at 150.0 deg C?
Tuesday, March 6, 2012 at 8:03pm by Caitlin

math
The height H of the building can be found from the equation: tan(8°)=H/100 or H=100tan(8°) ....(1) After he "backed-up" to a distance of D from the building, the new relation with the height is: tan(1°48')=H/D or D=H/tan(1°48')....(2) So substitute H from (1) ...
Monday, September 26, 2011 at 6:29pm by MathMate

Almeida
The two largest diner chains in Kansas compete for weekday breakfast consumers. The two chains, Golden Inn and Village Diner, each offer weekday breakfast customer a â��breakfast clubâ�� membership that entitles customers to a breakfast ...
Tuesday, December 7, 2010 at 1:27am by Pedro

physics
A 87-g ice cube at 0°C is placed in 886 g of water at 28°C. What is the final temperature of the mixture?
Tuesday, April 17, 2012 at 3:32pm by cindy

physics
A 87-g ice cube at 0°C is placed in 886 g of water at 28°C. What is the final temperature of the mixture?
Tuesday, April 17, 2012 at 6:17pm by cindy

Chemistry II
Spec heat of ice: 2.09 j/(g*deg C) Spec heat of liq water: 4.18J/(g*deg C) Enthalpy of fusion: 334 J/g Enthalpy of vaporization: 2250 J/g
Thursday, February 4, 2010 at 9:27pm by Davis

Physics
The rotation matrix, R(θ), for a rotation of θ counter-clockwise (CCW) is: | cosθ -sinθ | | sinθ cosθ | Rotation of the basis by 20° CCW is the same as rotating the vectors 20° CW, or θ=-20°. A = (12cos(60°),12sin(60&...
Sunday, June 27, 2010 at 4:27pm by MathMate

math
1 deg/30 min = .033 deg/min 1 deg/45 min = .022 deg/min so working together would yield .033+.022 = .055 deg/min or 1/.055 = 18.2 min/deg
Friday, May 14, 2010 at 12:33am by Damon

pre calculus
Convert the given number into the form a+bi = α(cos(β)+i sin(β)) where α = sqrt(a^2+b^2) β = sin-1(b/α) If the number is plot in the complex (Z) plane, it will be more evident. For example, 64i will have α=64 (the distance from origin) &...
Friday, May 20, 2011 at 4:14pm by MathMate

chemistry
Assuming density of water = 1, specific heat = 1 cal/g and initial temperature of ice = 0°C latent heat of fusion of ice mass of ice = x mass of water = 350 calories above 0° before mixing: E0 = 350*24+x*0+x*(-80) calories after mixing: E1 = (350+x)*4 Equating calories...
Friday, August 27, 2010 at 4:39pm by MathMate

Physics
"Luke Skywalker mixes 250g of hot water (75 deg C) with 500g of cool water (15 deg C). What is the final temperature of the water?" If someone could just give me a formula, I'd be fine. :)
Saturday, October 4, 2008 at 12:03pm by Jen

physics
A 400 g marble block has a specific heat of 860 J/kg C deg. If the block is placed in 700 ml of water, the marble changes it temperature by 17 Celsius degrees. Since the specific heat of water is known to be 4186 J/kg C deg, what is the temperature change of the water. (The ...
Wednesday, February 19, 2014 at 7:20pm by Ann

math
A = Compliment = X Deg. B = (X/2 + 15) Deg. The sum of complimentary angles = 90 Deg. X + (X/2+15) = 90 Deg. Multiply both sides by 2: 2x + x + 30 = 180. 3x = 180 - 30 = 150. X = 150 / 3 = 50 Deg. x/2 + 15 = 50/2 + 15 = 40 Deg.
Wednesday, March 14, 2012 at 7:01pm by Henry

Chemistry (really need help)
The idea is sound. In chemistry, you need to be very careful with accuracy, and show all conversion factors. (75-35)°F=22.22°C is correct. 1 US fl. oz weighs about 29.57 g (check the conversion factor). So 12 fl.oz (of water) weighs about 354.88 g. Do not forget that ...
Thursday, September 16, 2010 at 6:34am by MathMate

geometry
That's what you'll get: ---S---- ------M------- ------------L------------ Two parallel lines that coincide, the angles of the "triangle" are 0°, 0° and 180°.
Tuesday, October 26, 2010 at 5:52pm by MathMate

Chemistry
How much heat in kJ is lost when 100.0g of steam at 200 deg C is cooled down until it forms ice at -30.0 deg C?
Tuesday, March 6, 2012 at 8:44pm by Caitlin

MATH
e^0 i = cos 0 + i sin 0 = 1 that does not help much e^2 pi i = cos 2pi + i sin 2pi = 1 so 1^(1/6) e^(2 pi/6)i 2 pi/6 = pi/3 = 60 deg so cos theta + i sin theta 0 deg 1 60 deg 120 deg 180 deg -1 240 deg 300 deg none of these is along the i axis so i and -i are out only 2. which...
Thursday, January 23, 2014 at 7:10pm by Damon

trigonometry
180 degrees = 179 deg + 59' + 60" - .............73 deg + 56' + 6" ---------------------------------- ...............106 deg + 3' + 54"
Thursday, January 15, 2009 at 7:20pm by Damon

Chemistry
An ice cube at 0.00 degree celsius with a mass of 23.5 g is placed into 550.0 g of water, initially at 28.0 degree celsius, in an insulated container. Assuming that no heat is lost to the surroundings, what is the temperature of the entire water sample after all the ice has ...
Friday, April 27, 2012 at 8:06pm by Amir

physics
V1 = (6.90m,0 deg). V2 = (7.7m,270 deg). X = hor. = 6.90cos(0) + 7.7cos270, X = 6.90 + 0 = 6.90m. Y = ver. = 6.90sin(0) + 7.7sin270, Y = 0 + (-7.7) = -7.7m. tanA = Y / X = -7.7 / 6.9 = -1.1159, A = -48.1 deg,CW. A = -48.1 + 360 = 312 deg.,CCW. D = X / cosA = 6.90 / cos312 = 10...
Thursday, October 13, 2011 at 11:19am by Henry

Correct, assuming you work in degrees, 1+tan²(5°)-csc²(85°) =1+tan²(5°)-sec²(90-85°) =sec²(5°)-sec²(5°) =0
Tuesday, March 1, 2011 at 8:16pm by MathMate

Physics
1. 9 m @ 90 Deg. 2. 11 m @ 180 Deg. 3. 13 m @ 270 Deg. Your prob. says 4 possible locations, but I only see 3.
Thursday, February 9, 2012 at 3:00pm by Henry

physics
Q.an aluminium can of mass 200gm contains 500gms of water at 50c.an ice cube of mass 50gms,initially at a temperature of -20c is thrown into the can of water. i.what is the final temperature onces the ice metls and comes into equilibrium? ii.now a 200gm piece of Iron whose ...
Saturday, June 1, 2013 at 11:05am by rosy

math
The angles of a triangle add up to 180°. x + (120-x) + third angle = 180° third angle = 180° - x - (120-x) = 180° - 120° = 60°
Wednesday, April 13, 2011 at 4:24pm by MathMate

algebra ll
1st term: 3rd Deg. 2nd term: 2nd Deg. 3rd term: 1st Deg. 4th term: 0 Deg. The deg. of a polynomial with one variable(x) is = to the largest exponent. Therefore, we have a 3rd deg. or 3rd order polynomial.
Saturday, May 5, 2012 at 11:13am by Henry

physics
1. d = 20km @ 60deg. + 30km @ 0 deg. + 10km @ 90 deg. X = hor. = 20cos60 + 30km + 0, X = hor. = 10 + 30 = 40km. Y = ver. = 20sin60 + 0 + 10sin90, Y = ver. = 17.32 + 0 + 10 = 27.32km. tanA = Y / X = 27.32 / 40 = 0.4330, A = 23.4 Deg. d = X / cosA = 40 / cos23.4 = 43.6km @ 23.4 ...
Sunday, October 30, 2011 at 2:42pm by Henry

Physics
10^3 * time in seconds t = Joules in so 10^3 t = 2 kg*2000 J/(kg deg)*(20 deg) + 2 kg (334*10^3 J/kg) 10^3 t = 80* 10^3 J + 668 *10^3 J t = 748 s or about 12.5 minutes
Saturday, November 17, 2012 at 7:00pm by Damon

geometry
1 = X Deg. 3 = 3x Deg, 6 = 6x Deg. X + 3X + 6X = 180 Deg. 10X = 180, X = 18 Deg. 3X = 3 * 18 = 54 Deg. 6X = 6 * 18 = 108 Deg.
Thursday, September 30, 2010 at 4:59pm by Henry

How do I solve for this??
H (joules) =ΔT*m*Q where H=energy required (joules) ΔT=change in temperature (°C) m=mass (g) Q=specific heat in j/°C/g So heat gain =12.67 °C * 100 g * 4.180 j/°C/g =5296 j
Monday, June 24, 2013 at 7:28am by MathMate

Geometry
Let each of the equal angles be A. Since we know that the angles of a triangle add up to 180°, we determine that the third angle is (180-2A)°. Thus A=2(180-2A) 5A = 360 A = 72 Therefore the angles are 72°, 72° and 36°.
Monday, October 26, 2009 at 3:32pm by MathMate

Physics
remember if the degrees is negative then subtract it from 360 example: F1 @ -10 deg F2 @ 30 deg F1 is actually @ 350 deg F2 is still 30 deg
Tuesday, May 3, 2011 at 5:00pm by Anonymous

physics
The liquid water at higher than 0 deg C or 32 deg F prevents the fruit from freezing.
Monday, April 23, 2012 at 6:01pm by Damon

Math
The height of the building, H, divided by the length of the shadow, L, equals tangent 24°, or tan(24°) = H/L rearranging, H=L*tan(24°) =235tan(24°) feet.
Tuesday, February 1, 2011 at 10:24am by MathMate

Physics
A cube of ice is taken from the freezer at -8.8°C and placed in a 103 g aluminum calorimeter filled with 321 g of water at room temperature of 20°C. The final situation is observed to be all water at 15°C. What was the mass of the ice cube? Could someone please help me get a ...
Friday, April 20, 2012 at 4:04pm by John

geometry
The supplement of an angle x is 180°-x. the measure of x is greater than four times the measure of a supplement to it. => x>4(180°-x) x>4*180°-4x 5x>720° x>144° Can you now graph x on a number line?
Tuesday, November 30, 2010 at 6:45pm by MathMate

science
If you have 10 lbs shrimp at 80 deg F how much ice would it take to reach 50 deg F in 10 minutes?
Wednesday, August 7, 2013 at 3:54pm by bill

physics
A 400 calorie quantitiy of heat is added to 20 grams of water and as a result, the water reaches a final temp of 70 deg. C. The starting temp of the water was most nearly _____ deg C.
Friday, November 12, 2010 at 1:02pm by Sonya

PHY
331°CW from the +x axis is the same as 360°-331°=29° in the trigonometric sense, namely 29° CCW measured from the +x axis, in the first quadrant. 1. To get the angle "east of north", subtract 29° from 90 (north). 2. The angle is 29° above the x-axis...
Sunday, August 22, 2010 at 7:15pm by MathMate

chemistry
An ice cube with a mass of 40.0 g melts in water originally at 25.0 degree C. a. How much heat does the ice cube absorb from the water when it melts. Report the answer in calories, kilocalories, joules b. Calculate the number of grams of water that can be cooled to 0 degreeC ...
Tuesday, April 27, 2010 at 10:13am by kim

surveying math
The theodolite measures 0° when the telescope is horizontal, and 90° when it is vertically upwards. So -40° is 40° below the horizontal. The sloping distance is 806.388, so the horizontal distance is 806.388*cos(40°)=617.729
Friday, October 15, 2010 at 11:05pm by MathMate

chemistry
A sealed flask contains 0.40 g of water at 28 deg. celsius. The vapor pressure of water at this temperature is 28.36 mmHg
Sunday, September 6, 2009 at 8:54pm by jeff

Heat Transfer
A 1 m square verticalplate is heated to 300 deg C and placed in room air at 25 Deg C. calculate the heat loss from the one side of the plate
Thursday, March 27, 2014 at 1:48pm by RHS

Discrete Math
I believe we have to set something straight: namely the definition of g°f, which is the main cause of confusion. At the end of this post, there are two references which define the composition operator: (g°f)(x)=g(f(x)), or equivalently (f°g)(x)=f(g(x)) They amount ...
Thursday, February 17, 2011 at 7:41am by MathMate

physics
F1 = 300 N @ 25 deg., F2 = 275 N @ 160 deg, F3 = 325 N @ 300 deg. X = hor.=300cos25+275cos160+325cos300, X = hor.= 271.9 + (- 258.4) + 162.5, X = hor.= 176 N. Y=ver.=300sin25 + 275sin160+ 325sin300 Y = ver. = 126.8 + 94.1 + (-281.5), Y = ver. = -60.6 N. tanA = Y/X = -60.6 / ...
Sunday, November 7, 2010 at 2:22pm by Henry

Precal
sinA = 0.45, A = 26.7 Deg. tanA = 15, A = 86.2 Deg. sinA = (-0.125), A = -7.2 Deg. =-7.2 + 360 = 352.8Deg. sinA = (-1/3), A = -19.5 Deg. = -19.5 + 360 = 340.5Deg.
Wednesday, March 30, 2011 at 9:40pm by Henry

physics
A = 57m @ -20 deg. B = 70m @ 57 deg. -20 = 340 deg.(ccw from 0 deg.), x =hor= 57*Cos(340) + 70*Cos(57)=91.7m y =ver= 57*Sin(340) + 70*Sin(57)=39.2m D^2 = X^2 + Y^2 =(91.7)^2+(39.2)^2= D^2 = 8408.89 + 1536.64 = 9945.53, D = sqrt(9945.53) = 99.7 Meters.
Wednesday, September 8, 2010 at 6:38pm by Henry

Physics
A 6-g ice cube at −8°C is dropped into 70 g of water at 31°C. (a) After enough time has passed to allow the ice cube and water to come into equilibrium, what is the temperature of the water? (b) If a second ice cube is added, what will the temperature be?
Friday, July 20, 2012 at 11:11am by Vladimir

physical
Specific Heat. Copper has a specific heat of 0.092 cal/g/deg C. A 75 gram copper mass has been heated to a temperature of 100 degrees C. The copper is placed in thermal contact with 50 grams of water at 25 degrees C. What will be the final equilibrium temperature of the copper...
Saturday, November 23, 2013 at 11:56am by Anonymous

Physics
An object of mass 7.0 kg falls through a height of 47.0 meters and, by means of a mechanical linkage, rotates a paddle wheel that stirs 0.670 kg of water. The water is initially at 5.5 deg C, What is the maximun possible temperature of the water? (Answer in deg C)
Friday, March 21, 2008 at 8:22am by Josh G,

chemistry
A thimbleful of water at 100 deg C has a higher temp than a swimming pool full of water at 20 deg C, but the pool has more thermal energy than the thimble. Explain why this is possbile?
Monday, April 26, 2010 at 7:28pm by lala

Math
Let the second observation be taken at x miles from the mountain. Then xtan(9°) = (13+x)tan(3.5°) Solve for x after substituting the trig. ratios. The height of the mountain is therefore xtan(9°) miles =5280 x tan(9°) ft.
Monday, November 22, 2010 at 5:43pm by MathMate

trig
60 + 45 + R = 180 Deg. R = 75 Deg. R = 75deg * (pi/180)rad/deg=5pi/12rad.
Saturday, May 7, 2011 at 6:34pm by Henry

algebra
-4x^3 = 3rd Deg. +2x^2 = 2nd " +7x = 1st : +1 = 0 deg. Since the largest exponent is 3, this is a 3rd deg. polynomial.
Saturday, November 12, 2011 at 11:26am by Henry

Physics
I need to sketch a 45 deg - 45 deg - 90 deg triangle and indicate the lengths of each side assuming the hypotenuse is = to 1 meter
Friday, February 19, 2010 at 10:40pm by Lisa

Physics
56n @ (90+45) deg = 56n @ 135 deg. 36n @ (90-75)deg = 36n @ 15 deg. X = hor. = 56n*cos135 + 36n*cos15 = -39.6n + 34.8n = -4.8n. Y = ver. = 56n*sin135 + 36n*sin15 = 39.6n + 9.3n = 48.9n. tanA = Y/X = 48.9n / -4.8n = -10.19, A = -84.4 deg,CW = -84.4 + 180 = 95.6 deg,CCW. R = x/...
Saturday, August 27, 2011 at 10:39am by Henry

Physics
For the equilibrant, add the same vectors but with opposite directions (180 deg away), namely theta_{1} = 60 deg and theta_{2} = 205 deg
Tuesday, December 14, 2010 at 6:30pm by drwls

heeeeeeeelp math
Given ΔABC, A=20° B=80° => C=80° => isosceles triangle with base BC=x. Let E=mid-point of BC, then ΔAEC is a right triangle right-angled at E EC=x/2 By definition of cosine, AC=(x/2)/cos(80°) =x/(2cos(80°)) Consider ΔADC, AD=x (given...
Friday, July 5, 2013 at 8:33am by MathMate

Science
I conducted an experiment of the heat of combustion for three alcohol fuels, methyl, propyl and ethyl. The results were: Methyl - mass before was 231.81g temp of water before heating was 15 deg c. temp of water after heating was 40 deg c. mass of methyl after heating 229.92g ...
Monday, November 8, 2010 at 3:50pm by Paul

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