Saturday
June 25, 2016

Posts by Scott

Total # Posts: 961

physics
charge = capacitance * voltage coulombs = Farads * volts
January 26, 2016

Chemistry
each molecule of ammonium nitrate yields one ammonium ion and one nitrate ion so, twice the number of moles that you started with
January 26, 2016

Mathematics
draw the picture... d = h / tan(52º)
January 26, 2016

Science
a galvanometer measures current an electromagnet is the active element try B.
January 26, 2016

physics
see physics/tom about ten questions below this
January 26, 2016

physics
(a) v = 100 m / 8.70 s (b) constant acceleration (from zero) means that the average velocity during the acceleration phase is half of the final velocity (v/2) t + v (9.58 - t) = 100 m plug in v and solve for t (c) average acceleration is v/t
January 26, 2016

Science
the force (in Newtons) equals the product (multiply) of the charges (in Coulombs) divided by the distance (in meters) squared f = q₁ q2 / d²
January 26, 2016

math
this is true because a diameter is a straight line connecting two points on the circumference of a circle
January 25, 2016

Chemistry
the balanced equation reveals the answer C₃H₈ + 5 O₂ ---> 3 CO₂ + 4 H₂O looks like 6
January 25, 2016

phy 231
3.05 = -1/2 g t^2 + v sin(α) t + 2.10 19.2 = v cos(α) t plug in sin and cos values solve the system for v (and t)
January 24, 2016

Maths
5a + 10d + 7a + 21d = 167 10a + 45d = 235 solve the system for a and d S₂₀ = 20a + 190d
January 24, 2016

Physics
h = -1/2 g t^2 + 100 t + Ht 0 = (-4.9 * 25^2) + 2500 + Ht
January 24, 2016

science
to double the volume at a constant pressure, you have to double the ABSOLUTE (Kelvin) temperature 0ºC = 273.15ºK
January 24, 2016

statics
a score of 105 is one standard deviation above the mean the rule says that 68% of a normally distributed population lies within one standard deviation of the mean...half above the mean and half below so 34% are within one standard deviation above the mean this means that 16% ...
January 24, 2016

ALgebra
t for ten and w for twenty t + w = 54 10 t + 20 w = 780 solve the system
January 21, 2016

Science
you don't have any units ... and Mars is more than a light-second away
January 21, 2016

Physics
let's call right positive momentum is conserved (5 * 4) - (2 * 6) = (5 * .8) + (2 * v) 8 = 4 + 2v
January 21, 2016

physics101
how far from the end of the platform?
January 21, 2016

Chemisty
yes, it's A because the specific heat is lower, it takes less heat to raise the temperature a greater temperature change for a given amount of heat means that the temperature changes faster
January 21, 2016

physics
the desired acceleration is twice the gravitational acceleration, in an upward direction so the required force is 3 g's f = m a = 5 * 30 = 150 N
January 20, 2016

Chemistry
Cl is -1, so the Fe is +2 or +3
January 19, 2016

Physics
gravitational force parallel to the plane is...m * g * sin(30º) If the efficiency of the plane is 75%, then the coefficient of friction is .25 the normal force is...m * g * cos(30º) so the minimum force is [m * g * sin(30º)] + [m * g * cos(30º) * .25]
January 19, 2016

math
let t equal the fill time the pipes each fill a fraction of the pool the fractions sum to one (the whole pool) one fraction is t/8 the other is t/12 t/8 + t/12 = 1 24 is the LCD 3t + 2t = 24
January 19, 2016

Chemistry
it takes 4.179 J of heat to change the temperature of 1 g of water by one ºC 209 / (10.0 * 4.179) = temp. change looks like about a 5ºC increase
January 19, 2016

Chemistry
1 L of .1 M contains .1 moles volume = .1 mole / 12.1 mol/L .1 / .0121 mol/ml = ?
January 19, 2016

Chemistry 101
there are 2.54 cm in an inch a cm^3 is the same as a mL volume = π * .5^2 * 2.5 * 2.54^3 ...the result is in cm^3 multiply the volume by the density (.26)...that is the mass in g round the result to TWO sig fig ...that is the limiting number in the density value
January 19, 2016

Chemistry 101
there are 2.54 cm in an inch volume = π * 3.25^2 * 12 * 2.54 * 100 ...the result is in cm^3 ...it also equals the mass in g there are (approx) 453.6 g in a pound ...divide to find the mass in pounds
January 19, 2016

Chemistry 101
there are 2.54 cm in a inch ...12 inches in a foot ...5280 feet in a mile multiply to find the cm in a mile ...divide by 100 to find the meters convert 9.37 x 10^7 mi to meters ...by multiplying divide the result by 3 x 10^8 the answer is in sec ...THREE significant figures...
January 19, 2016

Math
there are 10 marbles, with 3 pink so the probability of pink is 3/10 for 2 pink draws (with replacement) ...probability = .3 * .3
January 19, 2016

math
3 differences (7 to 10) is 9 so d = 9 / 3 = 3 the 7th term is 6 differences from the 1st term ...1st + (3 * 6) = 7th ...1st + 18 = 19 so the 1st three terms are ...1, 4, 7
January 19, 2016

physics
momentum is conserved Mb * V1b = (Mb * V2b) + (Mp * Vp)
January 18, 2016

Physics
does your instructor teach significant figures?
January 18, 2016

physics
google electromagnetic spectrum energy
January 18, 2016

trigonometry
by Pythagoras 10^2 + x^2 = (20 + x)^2 x^2 + 100 = x^2 + 40x + 400 -300 = 40 x there appears to be something wrong with the numbers in the problem
January 18, 2016

math help please
did you check your 1st posting?
January 18, 2016

math help please
check your mail
January 18, 2016

Math ASAP
6. C 7. A distribute first then combine like terms
January 18, 2016

Pre-Calc
yes
January 18, 2016

Physics
the tangent of the elevation angle is the bullet drop (1.13 m) divided by the target distance (120 m)
January 18, 2016

Math ASAP
4. 2x = -2 7. correct
January 18, 2016

help on math
30% farther is 260 ft (200 * 1.30) up 25.5 and down 40.5 is a net down of 15 260 + 15 = ?
January 18, 2016

Math
double the first EQUATION , then subtract THE 2ND EQUATION to get y 2x + 4y - 2x - 3y = 22 - 50 y = -28 substitute into the 1st equation to find x
January 18, 2016

Algebra
90 + .7 m < 60 + .8 m 30 < .1 m 300 < m
January 18, 2016

High school mathmetics
using 10 sales (he may have more or less) [(500 * 4) + (600 * 6)] / 10 = 560
January 18, 2016

Pre Calc
the radius is √[3^2 + (-1)^2] = √10 sec(Θ) = √10 / 3
January 18, 2016

Math
one orbit in 3 hr 360º in 3 hr = 120º / hr 2º / min
January 18, 2016

Physics
an Ampere is a coulomb per second you're off by a factor of 60
January 18, 2016

math help
every 4 months is 3 times a year for 2 cars, 6 oil changes 6 * 4.5 = 27 qt of oil (27 / 5) * 14.99 = ? looks more like B but if the oil has to be purchased in 5 qt increments then 27/5 means 6 containers (answer C) but (again) there is oil left over that can be used next year ...
January 18, 2016

8th grade math and algebra class
y is usually graphed as a function of x bags on the x-axis total cost on the y-axis you should get a line with the slope changing at intervals you may need different scales on the two axes
January 18, 2016

Physics
m g = 2 * 1/2 k x^2 m g = k x^2 m g / x^2 = k
January 17, 2016

Physics
Vbullet = Vblock-bullet * (Mblock-bullet) / Mbullet 1/2 Mbb Vbb^2 = Mbb g * .658 * 6.66 Vbb = √(2 g * .658 * 6.66)
January 17, 2016

Math/ algebra
you found the answer...1/16 6.25%
January 17, 2016

Maths
just find the perfect squares on either side of the given root A) √4 , √9 --- 2, 3 B) √25 , √36 --- 5, 6 the rest work the same way
January 17, 2016

chem
Zn + 2 HCl ---> ZnCl₂ + H₂ so .1 moles of HCl reacts with .05 moles of Zn molar mass of Zn is 65.38 g .05 * 65.38 = ?
January 17, 2016

Chemistry
the temperature change of the air is 10.0ºk (C)...not 283.15
January 13, 2016

Physics
the change in energy from the bottom of the circle to the top is... (m g h) h = 90 cm the centripetal force at the top is only gravitational... m g velocity at top ... m v^2 / r = m g ___ v = √(r g) ... r is 45 cm the KE at the bottom equals the KE ___ at the top, PLUS (...
January 13, 2016

Math
adding 7 __ 4e^(-.03x)=20 dividing by 4 __ e^(-.03x)=5 taking natural log __ -.03 x = ln(5) dividing by -.03 __ x = ln(5) / -.03
January 13, 2016

Algebra
the 1st two answers are EQUATIONS of lines parallel lines have the same slope so just change the +7 to something else you are right about the perpendicular slope__so change the -2 to 1/2 the x-intercept means that y equals zero__so plug in zero for y and find x the form will ...
January 13, 2016

Math/Physics
1st measure __ h / tan(19º) = d 2nd measure __ h / tan(28.3º) = d - 910 substitute for d and solve for h
January 13, 2016

Math
If I put $20,000 into a CD in 1990, with a recurring 8.125% interest rate, how much would that amount to in 2015?
January 11, 2016

english
Which sentence is correct? a.Each guitar must be in their own case. b.Each guitar must be in its own case.****** c.Each guitar must be in his or her own case. ******-answer
December 11, 2015

english
is it C. why wouldn't it be B
December 9, 2015

english
Which sentence is punctuated correctly? a.“Thunder is good,” said Mark Twain, “But it is lightning that does the work.” b.“Thunder is good, said Mark Twain, but it is lightning that does the work.” c.“Thunder is good,” said Mark Twain...
December 9, 2015

Chemistry
nope mr estrada, i didnt, thats why i asked you
December 9, 2015

Chemistry
Did u think about it?
December 9, 2015

Math
Arianna is taking care of her uncle's dog during the week. He left 3 cans of food for 5 days. How much good should she give each day assuming the dog eats exactly the same amount each day
December 6, 2015

algebra
two mechanics worked on a car the first mechanic worked for 15 hours and the second mechanic worked for 5 hours together they charged a total of 1525 what was the rate charged per hour by each mechanic if the sum of the two rates was 175 per hour
November 3, 2015

Math
If you would walk around the earths Equator with an average speed of 5 miles per hour, how many days would you need to walk to come back to your starting point?
October 21, 2015

math
how to explain to my son write doubles fact you can use to find the sum.Write the sum 2+3=
October 19, 2015

Math
Mara finished 1/5 of her assignment on Saturday and 3/8 of her assignment on Sunday. What fraction of her assignment did she complete on Saturday and Sunday? --Thank you!--
September 30, 2015

Algebra
The boat travels 60 miles to an island and the same 60 miles coming back. Changes in the wind and tide made the average speed on the return trip 3 mph slower than the speed on the way out. If the total time of the trip took 9 hours, find the speed going to the island and the ...
August 1, 2015

math
express a single logarithm 1/3 log(b, x+3) log(b, y-4) log(b, x)
June 23, 2015

math
$8669.93
June 23, 2015

physics
A body is projected at an angle of 30degree to the horizontal with a velocity of 150metre per seconds.Calculate the time it takes to reach the greatest height,take g=10metre per seconds square and neglect air resistance.
June 18, 2015

math
A can of oil is 8 inches high and 8 inches in diameter. What is the approximate volume of the can?
June 6, 2015

Physics
A person whose mass is m = 96.0 kg steps on a mechanical bathroom scale placed on an inclined plane that makes the angle α = 15.3° with the horizontal. What is the reading on the scale?
May 28, 2015

Statistics
The manager of a company wants to investigate job satisfaction among its employees. One morning after a meeting, she talks to all 25 employees who attended. Does this sampling plan result in a random sample? What type of sample is it? Explain.
May 13, 2015

math
Why does Zara have a good driving record?
April 26, 2015

Statistics
Sammy and Sally each carry a bag containing a banana, a chocolate bar, and a licorice stick. Simultaneously, they take out a single food item and consume it. The possible pairs of food items that Sally and Sammy consumed are as follows. chocolate bar - chocolate bar licorice ...
April 13, 2015

Calculus
In a poll of 400 voters in a certain state, 61% said that they opposed a voter ID bill that might hinder some legitimate voters from voting. The margin of error in the poll was reported as 4 percentage points (with a 95% degree of confidence). Which statement is correct? A. ...
April 9, 2015

Calculus
Joe dealt 20 cards from a standard 52-card deck, and the number of red cards exceeded the number of black cards by 8. He reshuffled the cards and dealt 30 cards. This time, the number of red cards exceeded the number of black cards by 10. Determine which deal is closer to the ...
April 9, 2015

Algebra
(8,3);y=-1/4x+7
March 19, 2015

Statistics
A researcher predicts that watching a film on institutionalization will change students’ attitudes about chronically mentally ill patients. The researcher randomly selects 36 students, shows them the film, and gives them a questionnaire about their attitudes. The mean ...
March 16, 2015

Physics
What is the volume of water at 95 degrees Celcius if at 5 degrees Celcius the water is 5.56L?
March 11, 2015

Physics
A raft measures 1.7m x 0.67m x 0.14m, and it has a mass of 13.5kg. What is the maximum mass that the raft can hold and still stay afloat
March 11, 2015

not school
Needing help setting up equation.if 1/4 of inch is equal to one foot of actual size dimension,determine the length represented by 7/8.is it a division problem.and if so he would I write it out
March 11, 2015

chemistry
1. formula for Molality = n(solute)in mol/(m(solvent)) in (Kg) so: first convert mass of C7H8 into moles, then divide that by the mass of cyclohexane, which in this case is 15.8 g, then multiply by 1000 to convert to Kg. Report the answer to three significant figures. Ans: ...
February 9, 2015

Math
What simplified common fraction is equivalent to 0.05757575757
January 24, 2015

accounting
The Bean Company makes a sale with an invoice price of $97,000 on 10/1/14. The note is due on 10/1/17. There is no interest rate stated in the note. The market rate for similar notes is 10%. Assume annual compounding of interest. Prepare the journal entries for 10/1/14, 12/31/...
January 19, 2015

Math
Math
November 12, 2014

math
in a group of 180 person composed of men, women and children there are twice as many men as women and three times as many women as children. how many are there each?
November 9, 2014

Algebra
A woman invests $15000 in 2 separate investment accounts. One account earns 5.1%, one earns 4.2% simple interest. If she earns $21 in interest total, how much did she earn from each account. I keep getting x to be 67,666.67 by getting to this equation: .051x + .042(15000-x) = ...
October 28, 2014

Math
Eight-ninths of a bunch of marbles remain on a table. The square root of half the total number of marbles have rolled away. Also, the two children who are playing with the marbles each hold one marble. Find the total number of marbles in the bunch.
October 20, 2014

Math
18/25
October 15, 2014

business
it is a movement
September 25, 2014

math
Jason took 3/4 of an hour to paint 27 1/3 square yards. How many square yards does he paint per hour?
September 24, 2014

physics
A bullet is fired through a wooden board with a thickness of 8.0 cm. The bullet hits the board perpendicular to it, and with a speed of +350 m/s. The bullet then emerges on the other side of the board with a speed of +210 m/s. Assuming constant acceleration (rather, ...
September 11, 2014

science
h1 = -1/2 g t^2 + 100 h2 = -1/2 g t^2 + 50 t the balls cross when h1 equals h2 looks like 2 sec
September 10, 2014

math
12.5= 3/k how do u solve k?
August 7, 2014

physics
A.) the height of the slope is ___ 500m * sin(24º) GPE = m g h b.) .2 m g h = 1/2 m v^2 .4 g h = v^2
July 14, 2014

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