Wednesday
July 30, 2014

Posts by jean


Total # Posts: 433

more physics.
What change in entropy occurs when a 27.9-g ice cube at -12 C is transformed into steam at 115 C? Add the entropy changes due to: (1) heating the ice to 0C, (2) melting the ice, (3) heatng the water from 0 to 100 C, and (4) Evaporating the liquid water. For (2) and (3), the en...

physics.
Heat engine X takes four times more energy by heat from the hot reservoir than heat engine Y. Engine X delivers two times more work, and it reject seven times more energy by heat to the cold reservoir than heat engine Y. Find the efficiency of heat engine X and heat engine Y. ...

physics
At high noon, the Sun delivers 1000W to each square meter of a blacktop road. If the hot asphalt loses energy only by radiation, what is its equilibrium temperature? so I know that the formula to find the RATE OF RADIATION= the constant (5.6696 x 10^-8 W/m^2*K^4)*A*e*(T^4) but...

last physics problem.
At 25.0 m below the surface of the sea(density=1025 kg/m^3) where the temperature is 5.00 C, a diver exhales an air bubble having a volume of 1.00 cm^3. If the surface temperature of the sea is 20.0 C, what is the volume of the bubble just before it breaks the surface? You hav...

..physics.
At 20.0 C, an alumium ring has an inner diameter of 5.0000 cm and a brass rod has a diameter of 5.0500 cm. a. If only the ring is heated, what temperature must it reach so that it will just slip over the rod? b. WHAT IF? If both are heated together, what temperature must they ...

physics!
The New River Gorge bridge in West Virginia is a steel arch bridge 518m in length. How much does the total length of the roadway decking change between temperature extremes of -20.0C and 35.0 C? The result indicates the size of the expansion joints that must be built into the ...

physics
A rod of length 30.0 cm has linear density(mass-per-length) given by [lambda]= 50.0g/m + 20.0x g/(m^2) where x is the distance from one end, measured in meters.(a) What is the mass of the rod? (b) How far from the x=0 end is its center of mass? never mind. i got it.

calculus
Find the distance from (3,7,-5) to each of the following. a. the xy-plane b. the yz-plane c. the xz-plane d. the x-axis e. the y-axis f. the z-axis **I just wanna check my answers because I didn't really understand it when the teacher was explaining it and it's an even...

principles of finance some please help me!
The fixed cost for a firm drop by 25%. Prior to this breakthrough fixed cost were $100,000 and unit contribution maegin was and remains at 5.00. The new amount of break-even units will be: Thank You Very Much! ps: I got two answer Some information appears to be missing here. A...

fiannce
the fixed costs for a frim drop by 25costs%. Prior to breakthrough fixed were $100.000 and united contribution margin was and remains at 5.00. The new amount of break-even units will be: is it 15,000 or 20.000 why? Thank You

finance
perferred stock differs from common stock in thay prefrred stock: Which 1 a. usually has a maturity date. b. can never be called. dividends are generally fixed in amount. c. dividends are deductible for tax purposes.

finance
A case wine costs 128 Euros. If the exchange rate for one U.S. dollar is equal to 0.7442 Euro, What is the price of a case of French wine in U.S.dollars? My answer is $95.00 is it right. You have it backwards. If you divide $128 by 0.7442, you'll find that a case of French...

Finance
Preferred stock differs from common stock in that preferred stock: Preferred stock always receives a stated interest payment if the company is solvent, but they are subject to being called. Bondholders have first call on payment. Common stock dividends are at the discretiuon o...

principles of finance
You are considering the purchase of XYZ Company's preferred stock, which pays a perpetual annual dividend of $8 per share. If the appropriate discount rate for this investment is the price of one share of syock? need a answer by tonight. Thank You!

principles of finance
A project has intial outlay of 4,000. It has a single payoff at the end of year 4 0f 6,9996.46. What is the internal rat of return for the project (round to the nearest %) need by tonight. Thank You 4000*(1+r)^4 = 6996.46 (I think you typed too many nines in 6,9996.46) (1+r)^4...

principles of finance
You are considering the of xyz company's perpetual preferred stock, which pays a perpetual divend of $8 per. If the appropriate discount rate for this investment is 14%, what is the price of one share of this stock? Thank you. Preferred stock differs from common stock in t...

SS
Wikipedia is not always right.

PLEASE HELP SOLVE RIDDLE
1. maximum of two people can go on the float. 2. Father cannot be with any of his daughters without the mother being present. 3. Mother cannot be with any of her sons without the father being present. 4. The prisoner cannot be alone with any one member of the family. 5. Only t...

physics
A spring-loaded toy dart is used to shoot a dart straight up in the air, and the dart reaches a maximum height of 16m. The same dart is shot straight up a second time from the same gun, but this time the spring is compressed only half as far before firing. How far up does the ...

physics
A 20.0kg block rests on a plane inclined at 20.0o to the horizontal. The coefficient of static friction is 0.250, and the coefficient of kinetic friction is 0.150. (a) What is the minimum magnitude of the force F, parallel to the plane that will prevent the block from slipping...

physics.
A 20.0 kg cannon ball is fired from a cannnon with muzzle speed of 1000 m/s at an angle of 37.0 with the horizontal. A second ball is fired at an angle of 90.0. Use the conservation of energy principle to find a] the maximum height reached by each ball and b] the total mechani...

physics
A ball rolls horizontally off the edge of a tabletop that is 1.0m high. It strikes the floor at a point 1.5m horizontally away from the edge of the table. Find the speed when the ball left the table. Find the time it takes to fall 1 meter. Then, you have that time for the hori...

physics
A sled of mass m is given a kick on a frozen pond. The kick imparts to it an initial speed of 2.00 m/s. The coefficient of kinetic friction between sled and ice is 0.100. Use energy considerations to find the distance the sled moves before it stops. find the initial KE. set th...

physics
a 2.00 kg block is attached to a spring of force constant 500 N/m. The block is pulled 5.00 cm to the right of equilibrium and released from rest. Find the speed of the block as it passes through equilibrium if a) the horizontal surface is frictionless and b) the coefficient o...

physics
Consider an object on which the net force is a resistive force proportional to the square of its speed. For example, assume that the resistive forve acting on a speed skater is f=-km[v^2], where k is a constant and m is the skater's mass. The skater crosses the finish line...

Physics
Calculate the force required to pull a copper ball of radius 2.00 cm upward through a fluid at the constant speed 9.00 cm/s. Take the drag force to be proportional to the speed, with proportionality constant 0.950 kg/s. Ignore the buoyant force. Forcedrag=k v = .950kg/s * .09m...

Physics
A sky diver of mass 80.0 ks jumps from a slow-moving aircraft and reaches a terminal speed of 50.0 m/s. a) What is the acceleration of the sky diver when her speed is 30.0 m/s? What is the drag force on the diver when her speed is b) 50.0 m/s? c) 30.0 m/s? If you assume drag f...

English
What are some words to describe the tone of an author's diction? This list comes that an AP English teacher in Raleigh, NC gave her students. TONE WORDS: angry, sharp, upset, silly boring, afraid, happy, hollow, joyful, sad, cold, urgent, joking, poignant, detached, confus...

math
jamie ran two laps around a track in 99 seconds. how long did it take him to run each lap if he ran the first lap 8.5m/s and the second at 8.0m/s? Let t be the first lap time and L be the length of one lap. 8.5 m/s * t = L 8 m/s * (99-t) = L These two equations in two unknowns...

Algebra
Celsius temperature readings can be converted to Fahrenheit readings using formula F=9/5c+32 What is the fahrenheit temp. that corresponds to each of the following Celsius temperatures -10, 0, 15, 1000? I will be happy to critique your work on this. You have the formula, just ...

algebra
How do I figure out this problem? You have 37 coins (all nickels , dimes, and quarters) adding up to $5.50. You have 4 more quarters than nickels. How many dimes do you have? Let q,d and n stand for the number of quarters, dimes and nickels you have respectively. Thus we know ...

Advanced Algebra
whats a dinition for a undefined slope

Math
Hole digger A 69-inch-tall worker is digging a hole. In the morning the worker's head is a certain distance above the ground. That night the worker's head is the same distance below the ground. Also that night the worker's feet are twice as far below the ground as ...

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