Nuclear Chemistry
How does the number of protons, neutrons, and the mass number of the reactant compare with those of the products?
Also, how do you tell which is a reactant and which is a product?
What's the angle between the hour and minute hand at 3:27?
What's the angle between the hour and minute hand at 3:27?
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06/24/17
Complete two iterations of Newtons Method to approximate a zero of the functions using the initial given guess. Show all work.
Complete two iterations of Newtons Method to approximate a zero of the functions using the initial given guess. Show all work.
1. f(x) = x^2 - 5 ; x1 = 2.22. f(x) = cos x ...
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06/09/17
Question on displacement vectors
A golfer, putting on a green, requires three strokes to "hole the ball." During the first putt, the ball rolls 5.0 m due east. For the second putt, the ball travels 2.1 m at an angle 20° north of...
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Calculate the percent composition of the element (Show All Work)
Formula: Na2CO3
05/22/17
Physics Help
An 800 N board is moved a distance of 0.06 m by a screw. If the efficiency of the screw is 18%, what was the input work on the screw? A. 48 J B. 144 J C. 267 J D. 480 J
05/14/17
If you have a solution with a [H+ ] of 8.5 x 10 -9 M, what is the pH of the solution to the correct number of significant figures?
I need help with this question
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04/19/17
If the odd natural numbers are arranged like a pyramid , then what r the extremities of the row containing the number 2009. 1
they r arranged like this:-. 1
3. 5
7. 9. 11....
04/04/17
complete the square, find vertex?
complete the square of y = 5x2 - 30x + 9
and find the vertex.
Assume that the backwards running marathon record is 3h 53min 17s.
Determine the average of this 42.2km race. Express your answe in both m/s and km/h.
ans.(3m/s, 10.9km/h)
03/28/17
aolve with addition method
the standoff university women's basketball team made 45 field goals in a recent game; some were two pointers and some were three pointers. How many 2 pointers were made and how many three pointers...
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03/27/17
UNIT circle question
An equilateral triangle is inscribed in the unit circle. find the exact perimeter of the equilateral triangle.
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Equilateral triangle UNIT circle
An equilateral triangle is inscribed in the unit circle. find the exact perimeter of the equilateral triangle.
03/15/17
tim can shell a bushel of peas in 2 hours. jill can shell a bushel in 3 hours. how long will it take them to shell a bushel of peas if they work together
tim can shell a bushel of peas in 2 hours. jill can shell a bushel in 3 hours. how long will it take them to shell a bushel of peas if they work together
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03/10/17
In triangle ABC, measure of angle B is 20, and that of angle C is 40, length of the bisector of angle A is equal to 2. What is the value of BC - AB?
In triangle ABC, the measure of angle B is 20, and the measure of angle C is 40. Moreover, the length of the bisector of angle A is equal to 2. What is the value of BC - AB?
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03/08/17
the observation deck of a tall skyscraper is 370m above the ground. calculate the time required for the penny to free fall this distance.
the observation deck of a tall skyscraper is 370m above the ground. calculate the time required for the penny to free fall this distance.
03/08/17
Convert 28.6 lbs of ammonia (NH3) per 1000 cubic feet to % volume in air. Mol Wt 17.0 Assume NTP
Convert 28.6 lbs of ammonia (NH3) per 1000 cubic feet to % volume in air. Mol Wt 17.0 Assume NTP
03/03/17
stoichiometry and gasses
2) how many grams of water will need to be decomposed to make the partial pressure of hydrogen be 98.8 kPa in a 355 ml container at 22.5° c?
3) a 3.2 L container of nitrogen and hydrogen is at a...
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03/02/17
A vector starts at (3, 5) and terminates at (6, 0). A second vector starts at the origin and terminates at (5, -2).
What is the absolute difference in their magnitudes?Round to 2 decimal places.
03/01/17
Physics - Help
Jose is trying to take apart an old bike. A rusty bolt is stuck and he thinks he should use a different wrench. What would be more effective for him to try?
03/01/17
Physics - help
The mass of Earth is 5.98x10^24 kg and the mass of the sun is 330,000 times greater than the mass of Earth. If the center of Earth is, on average, 1.495x10^11 m from the center of the Sun,...
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02/27/17
How tall is a person based on the shadow cast?
A person is standing 2.4 feet away from a light pole that is 25 feet tall. if the shadow cast by the person is 10 feet long, how tall is that person?
Any help would be greatly appreciated
02/06/17
The annual interest on a $10,000 investment exceeds the interest earned on a $2,000 investment by $640. The $10,000 is invested at a 0.4% higher rate of interes
what % is invested at $10,000?
what % is invested at $2,000?
02/05/17
Gas Chromatograghy
If a sample is made using 0.145g of methanol and 0.554g of ethanol, what percent of the total peak area is expected for the methanol peak (that is, what is 100*(area of methanol peak/(area of...
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01/26/17
I need help calculating molality, molarity and mole fraction from density.
an aqueous solution is 5.50% by mass of a nonelectrolyte (MM= 134 g/mol). If the density of the solution is 1.026 g/mL, calculate the molarity, mole fraction and molarity of the solution. I have no...
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