02/25/16

A 1500 W kettle warms 1.00 kg of water from ...
A 1500 W kettle warms 1.00 kg of water from 18oC to 88oC in a time of 3.6 min. How efficient is the kettle? Answer: 91%
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02/17/16

Physics question
1. Starting from rest, a proton falls through a potential difference of 1200 V. What speed does it acquire?   2. Calculate the net work done in moving an electron from point A, where the... more
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01/30/16

Finding the current in a complex circuit?
For the circuit shown below, find the current I1. (Take emf1 = 59.4 V, emf2 = 110.4 V, R1 = 19.2 Ω, and R2 = 5.50 Ω)   http://www.webassign.net/colfunphys1/20-p-026-alt.gif
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12/09/15

Radioactive Isotopes, exponential decay
The radioactive isotope 14C has a half-life of approximately 5715 years. Now there are 30g of 14C. (1) How much of it remains after 1400 years? ____ g  (2) How much of it remains after 14000 years?... more
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12/09/15

Radioactive Isotopes, Exponential Decay
The radioactive isotope 226Ra has a half-life of approximately 1599 years. After 1800 years, there are 2.5g of 226Ra. (1) What was the initial quantity? ____ g (2) How much of it remains after... more
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12/09/15

Radioactive Isotopes, exponential decay
The radioactive isotope 226Ra has a half-life of approximately 1599 years. There are 25g of 226Ra now. (1) How much of it remains after 1200 years? ____ g (2) How much of it remains after 12000... more
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12/08/15

Evaluate the integral below.
Evaluate the integral below.   ∫ 3??^−4?? ????
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12/07/15

Differentiate sinh-1 (tan(x))
Differentiate sinh−1 (tan(x))     ANSWER:  |sec(x)| practice test, #54
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12/07/15

When a cold drink is taken from a refrigerator, its temperature is 5ºC. After 25 minutes in a 20ºC room its temperature has increased to 10 ºC.
When a cold drink is taken from a refrigerator, its temperature is 5ºC. After 25 minutes in a 20ºC room its temperature has increased to 10 ºC. (a) What is the temperature of the drink after 50... more
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12/06/15

Find the derivative : y = log2 (x^2 / (x - 1)
Find the derivative :    y = log2 (x2 / (x - 1)     ANSWER:  1 / ln(2)   *   (2/x  -  1/(x - 1)) #36, practice exam
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12/06/15

Find the exact length of the polar curve. r = e^9x, 0 = x = 2pi
Find the exact length of the polar curve. r = e^(9θ), 0 ≤ θ ≤ 2π
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12/03/15

Series converges or diverges
∞∑  ((3n-2)/(5n+1))^nn=1
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12/03/15

Determine if the sequence converges or diverges
an=(1+(1/n3))^n
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12/02/15

Markov Chains
If the student attends class on a certain Friday, then he is three times as likely to be absent the next Friday as to attend. If the student is absent on a certain Friday, then he is five times as... more
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11/17/15

A weight loss program advertises "LOST 40 POUNDS IN 4 MONTHS".
A random sample of n = 25 customers has x ¯= 31 pounds lost and s = 12. To contradict this claim test H0: μ = 40 versus H1: μ < 40 at α = 0.05.     Find the associated p-value. Round to four... more
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11/10/15

Estimate the area under the graph
Suppose you estimate the area under the graph of f(x)=1x from x=11 to x=111 by adding the areas of rectangles as follows: partition the interval into 50 equal subintervals and use the left endpoint... more
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11/08/15

Find the Maclaurin series for f(x)= 1/(1+x^2)^2
I could really use some help please!
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11/08/15

Find the Maclaurin series for f(x)= x^2/sqrt(x^5+1)
I really have no idea how to go about this, could really use some help, thank you!
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11/04/15

4x + 2y = 12 and y = x - 3. Write the solution to this system of linear equations by typing the intersection point from your TI-83 Plus.
Use your TI-83 Plus to find the solution for this system of equations: 4x + 2y = 12 and y = x - 3. Write the solution to this system of linear equations by typing the intersection point from your... more
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10/27/15

Price Elasticity of demand
If P=80-.4Q what is the price elasticity of demand?
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10/22/15

Calculate the change in internal energy of the following system: A 100.0-g bar of gold is heated from 25°C to 50°C during which it absorbs 322 J of heat. Assume
Calculate the change in internal energy of the following system: A 100.0-g bar of gold is heated from 25°C to 50°C during which it absorbs 322 J of heat. Assume the volume of the gold bar remains... more
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09/29/15

Find f'(x) and f"(x): f(x)=x/x^2-1
Please help me 
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08/31/15

find the derivative of each of the following
1) f(x)=6x-11/8x+1   2) f(x)=(5x-2)(2x+3)/x-4   3) f(x))=√¯8-5x    
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08/27/15

Simplify (x+cos x)(cos x)-(1+sin x)(1-sin x)/(x+cos x)^2
Please help me
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08/25/15

A 10 foot ladder is leaning against a house and makes an angle of 67 degree's with level ground. How far is the top of the ladder above the ground.
(round to 10th of a foot)
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