08/25/15

Simplify (x+cos x)(cos x)-(1+sin x)(1-sin x)/(x+cos x)^2
I need help please
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08/25/15

Calculus Question
Which is the moment of inertia of the following system about the y-axis of the system   m1 = 6 at (2, 1)   m2 = 9 (-3, 6)   m3 = 11 (2, 9)
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07/13/15

2xy'' + (1-2x^2)y' - 4xy = 0
Solve by series of expansion: Put in closed form: 2xy'' + (1-2x^2)y' - 4xy = 0
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07/06/15

Thermodynamic Process
A 3.1-mole sample of an ideal gas is gently heated at constant temperature 290 K. The gas expands to 1.5 times its initial volume as its pressure decreases. What is the change in the internal... more
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07/05/15

Physics: Entropy Change
If a 0.06247 kg ice cube initially at 0.00 C is allowed to melt in a Styrofoam cup holding 0.497 kg of water at 10.0 C , what is the total entropy change for this process?
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07/05/15

Physics: Kinetic Theory
Kinetic theory a. What is the average kinetic energy of a monatomic gas at a temperature of 354 K? b. If this is Ne gas (neon has 20 nucleons) what is the root-mean-squared speed? c. What... more
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05/08/15

Statistics Help! Urgent!
Suppose that 16% of the population of the U.S. is left-handed. If a random sample of 130 people from the U.S. is chosen, approximate the probability that at least 20 are left-handed. Use the normal... more
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04/27/15

You fertilizer using one pound of N per 1000 square ft, 3x a year. Your bed = 5000 square ft. fertilizer = 25lb bags, costing $9, what is fertilizer cost?
garden math 
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04/26/15

poisson distribution
assume the number of customers arriving at canondale dealerships follows a poisson distribution and averages 16.8 every 15 minutes.  what is the probability that 25 customers will arrive in the... more
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04/20/15

Find a value of c satisfying Rolle’s Theorem for f(x) = x^3 -2x^2 -2x +4 on [0,2]. round your result to 3 decimal places.
It is continuous on [0,2] and differentiable on (0,2) f'(x)=3x^2-4x-2 The thing that I am stuck on is that f(a) does not equal f(b) f(0)=4 f(2)=0   I went ahead and plugged in the zero... more
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04/20/15

Find the increase in the water's entropy.
Suppose that by stirring 495 g of water you are able to increase its temperature from 19.0° C to 21.0° C. Find the increase in the water's entropy. answer in J/K
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04/19/15

See Description
  ∫ ex³•x2dx=
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04/19/15

solve f'(x)=4x-3 when the curve passes (2,3)
solve f'(x)=4x-3 when the curve passes (2,3)
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04/15/15

A rectangle has area 2yd squared and perimeter 6 yd, find dimensions
need answers in pointsand dimensions as well as using the quadratic formula to solve this system 
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04/15/15

Need help finding the efficiency of a heat engine.
If a heat engine takes in 957 watts of heat from a source at a temperature 1,000 kelvin and dumps off 126 watts of heat to a heat sink at 300 kelvins. What is the efficiency of the heat engine?
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04/13/15

A volume of nitrogen gas has a density of 1.15 kg/m3 and a pressure of 1.01 atm.
A volume of nitrogen gas has a density of 1.15 kg/m3 and a pressure of 1.01 atm. Find the temperature of the gas and the rms speed of its molecules
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04/06/15

Calculate the pressure on a man's feet if his weight is
(a) Calculate the pressure on a man's feet if his weight is 1107 N and the soles of his feet have a total surface area of 355 cm2.  (b) Find the pressure on his feet when his body is 65% submerged... more
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04/02/15

Find point of f(x)
Find point on f(x)=x^2 that is closest to point (4,0).
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03/29/15

Find the absolute extrema on [-2,2]
f(x)= 10–12x+6x2–x3      
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03/24/15

wavelength of light
When Michelson interferometer was used to measure the wavelength of monochromatic light, it was found that 400 fringes passed the observing microscope when the movable mirror was displaced 0.088... more
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03/07/15

How many ways can you pick the cars so not all are the same size?
For this problem, assume that you are to pick 4 cars from the motor pool, which contains 7 subcompact cars, 6 compact cars, and 4 midsize cars. How many ways can you pick the cars so not all are... more
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02/11/15

radius of curvature of mirror
A magnifying mirror produces an erect virtual image 2.5 times as high as the object 24 cm from it. Find the radius of curvature of the mirror.
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02/08/15

Find the radius of curvature of the mirror
 A magnifying mirror produces an erect virtual image 2.5 times as high as the object 24 cm from it. Find the radius of curvature of the mirror.
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02/04/15

Stats word problem
3. The probability that a person picked at random is over 65 years old is 0.12. If two people are picked at random, find the probability that: a. they are both over 65b. neither is over 65c. at... more
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01/26/15

Compound Interest #6-7
$4800 is invested at 3.2% APR compounded semiannually. Use the compound interest formula to compute the balance in the account after 14 years. Balance =____$ (Round to the nearest cent.)  $4800 is... more
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