Friday
December 9, 2016

# Posts by Roy

Total # Posts: 132

Physics
Ximena stands near the edge of a cliff 20 m above her friend Javier. If she throws a sandwich to Javier at an angle = 30 below the horizontal and it reaches him in 1.0 s, ignoring air resistance, what was the magnitude of the sandwich's initial velocity? A. 20 m/s B. 30 m/...
September 25, 2016

physics
the weight is evenly distributed so half of the N per rope. undo the weight which is massx9.80 by taking the mass divided by 9.80 then add acceleration to the acceleration of the earths gravity (fg=9.80) so that it looks like this; mass x (fg + a) then devide in two so each ...
September 19, 2016

geometry
Roy, Aaron, and Pete are given three identical rectangular blocks. They slice their blocks in different ways to get two equal halves. The resulting cross section in each of the three blocks is a .
July 9, 2016

algebra
Thank you Reiny, we typed it in incorrectly, but believe we have solved it. Will post later.
April 9, 2016

algebra
-1 -2 1+x = 72x 1 2 1/1+1/x =1/72x 2 1 2 2 (72x /1)1/1+1/x =1/72x (72x/1) 2 72x +72x=1 got stuck here
April 9, 2016

math
What is the sum of all values of x that satisfy the equation (x2 -5x+5)^(x2 +4x-60) =1? Hint: There are three cases to consider I think I figured out 2 of the cases. The first one being x2 +4x-60=0 while x2 -5x+5=whatever. The second is x2 -5x+5=1 and x2 +4x-60=whatever. But I...
January 3, 2016

finance
find the amount for each ordinary annuity if there are payments of \$700.00 at the end of each month into an account that pays 10% per annum, compounded monthly
June 21, 2014

Physics
T=1.5 s?
June 14, 2014

Physics
A 0.020 rubber stopper is swung in a horizontal circle by 0.80 cm thread that makes 30.0 revolution every 20 seconds. a.) what is the stopper's speed? T=? v=(2pi(r))/T
June 14, 2014

Please do Civics Essay thanks so much
Please Help with essay question. thanks!! In a federal system of government (also known as a federation), the local and state governments share power with the central government, though the central government has final authority. Eplain how this is different from a confederation.
May 1, 2014

Probability
natalie has a bag that contains eight marbles. she draws out a marble, record its color, and puts it back. if natalie repeats this eight times and does not record any red marbles, can she concludes that there are not any red marbles in the bag? Explain
April 27, 2014

science
A solutuion is prepared by adding 40 grams of NaC1 to 100 grams of water at 80 degrees Celcius. Describe this solution.
February 3, 2014

PHYSICS
Any hint for b? and c?
January 11, 2014

PHYSICS(help)
@Pete c) How do we deduce how far back the block moves with te energy difference obtained?
January 10, 2014

calculus
Find the definate integal (upper limit 1, lower limit 0) (7-4x)^2dx
October 10, 2013

calcus
int sec u du
October 8, 2013

calcus
int tan^3xsec^3x dx
October 8, 2013

calcus
int cosxsinx dx
October 8, 2013

physics
What is the self-inductance of an air-core solenoid,1m long and 0.05m in diameter,if it has 1400 turns?(a)5.23mH(b)4.84mH(c)3.63mH(d)2.42mH
October 1, 2013

physics
A magnetic field is applied to the plain of a flat coil of copper wire. The time variation of the magnetic flux density is given by Bosinwt.At which of the following values of t is the magnitude of the emf induced in the coil a maximum.(a)T/8(b)3T/8(c)3T/4(d)T/2
September 28, 2013

physics
If two wires P and O each of the same length and same material,are connected in parallel to a battery. The diameter of P is half that of Q. What fraction of the total current passes through P?(a)0.2(b)0.25(c)0.33(d)0.5
September 24, 2013

statistics
suppose that grade point averages of undergraduate students at one university have a bell shaped distribution with a mean of 2.55 and a standard deviation of 0.43. Using the empirical rule, what percentage of students have grade point averages that are between 1.26 and 3.84
September 23, 2013

maths
If four coins are flipped in succession,then the number of possible outcomes is(a)8(b)12(c)16(d)14
September 22, 2013

physics
A proton with speed v perpendicular to a magnetic field B is experiencing a force F.If the speed of the proton is doubled,the new force is (a)F/2(b)F(c)2F(d)4F
September 22, 2013

calculus
Find dy/dx, if y= 5e^x/cosx
September 17, 2013

calculus
Find dy/dx, if y= (sinx)^-1
September 17, 2013

physics
An electrical source with internal reistance r is used to operate a lamp of resistance R. What fraction of the total power is delivered to the lamp?(a)R+r/R(b)R-r/R (c)R/R+r (d)R/r
September 15, 2013

maths
If two dice are toced what is the probility of having a sum of 5 as the outcome(a)1/9(b)1/6(c)1/8
September 10, 2013

Math
Factorise : 1 + a + b + c + ab + bc + ca + abc
June 5, 2013

English
(mean,means)Fluoridated water.........fewer Americans are toothless today. (visit,visits)Grandparents and children alike..........their dentist for regular check ups. (love,loves)Dentists.......the fact that there is more awareness about dental hygeiene. (is,are)Despite the ...
May 29, 2013

Maths
1) Simplification (trigonometric ratios of allied angles)? Simplify : i) [cos^2 (2x180-A). tan^2 (180+A). sec^2 (180-A)] / [ sin^2 (3x180+ A). cosec^2 (-A). cot^2 (90+A)] ii)[ cos(90+A). sec(270+A). sin(180-A) ] / [ cosec (-A). cos (270-A). tan (180+A) ] Find values of x and y...
May 2, 2013

math
what is the formula for working out open cuboid.
March 4, 2013

math
what is the formula for working out open cuboid.
March 4, 2013

math
A pump brings underground water up to ground level. The water flow is measured in litres per minute.The pump fills an 18 litre bucket in 7 seconds.what is the speed of the pump flow
February 14, 2013

physics
the key is "net force". in both cases acceleration is zero. therefore net force is also zero. Newton's second law, Fnet = mass * accel
February 6, 2013

high shoool algebra
Joy is 20 years older than Bob. Three years ago, Joy was 5 times as old as Bob. How old are they now?
January 28, 2013

Trigonometry
Three ships are situated as follows: A is 225 miles west of C while B, due south of C, bears S25*10'E from A. a. How far is B from A? b. How far is B from C? c. what is the bearing of A from B? PLEASE EXPLAIN
September 9, 2012

Trigonometry
Points A and B 1000 meter apart are plotted on a straight highway running east and west. from A, the bearing of tower C is N32*W and from be, the bearing of C is N64*E. approximate the shortest distance of the tower from the highway. please explain........
September 9, 2012

Trigonometry
A plane is headed due east with airspeed of 240 mph. if a wind at 40 mph is bloiwing from the north , find the ground speed of the plane.
September 9, 2012

Trigonometry
Two sides of a right triangle are 8, 15 and 17 units. if each side is doubled, how many sqare units will the area of the new triangle be?
September 8, 2012

Trigonometry
A ladder 5 meter long leans against the wall of an apartment house forming an angle of 50 degrees, 32 minutes with the ground. how high up the wall does it reach?
September 8, 2012

Trigonometry
Triangle ABC is a right triangle with right angle at C. CD is perpendicular to AB. BC=4 and CD=1. find the area of the triangle ABC.
September 8, 2012

Trigonometry
The hypotenuse of a right triangle is 34cm. find the length of the two legs, if one leg is 14cm longer than the other.
September 8, 2012

Trigonometry
The perimeter of an isosceles triangle is 6.6824. find its area.
September 8, 2012

geometry
4X Over 30
January 18, 2012

linear math
8x + 6y = -15
January 10, 2012

science(chem)
How many moles of sulfate ions are present in 1.2 mol of aluminum sulfate?
November 25, 2011

umt
2. A charge of -3.00 µC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass (radius = 0.1 m). The charges on the circle are -4.0 µC at the position due north and +5.0 µC at the position due east. What is the ...
October 26, 2011

physics 12
A spacecraft of mass 470 kg rests on the surface of an asteroid of radius 1400 m and mass 2.0*10^12. How much energy must be expended so that the spacecraft may rise to a height of 2800 m above the surface of the asteroid? Thanks.
October 8, 2011

College Chemistry
Plaster of Paris is the compound calcium sulfate hemihydrate, CaSO4*1/2H2O What mass of water is liberated when a 2.763 gram sample is heated to constant mass? The sample is 2.763 grams How much of the 2.763 gram sample is water? I need an amount in grams. Amount of anhyrdate...
October 8, 2011

College Chemistry
Plaster of Paris is the compound calcium sulfate hemihydrate, CaSO4*1/2H2O What mass of water is liberated when a 2.763 gram sample is heated to constant mass?
October 8, 2011

physics 12
If the Earth has a mass of 5.98*10^24 kg and orbits the Sun at a radius of 1.43*10^11 meters. Find the mass of the Sun. Thank you.
October 7, 2011

algebra
10x.12.25y _______________ 2z.30x.20y help
September 13, 2011

Biology
b protien
September 8, 2011

Chemistry
I need to calculate this and I am to asume that all numbers are measurements. I am working with signifigant figures. .6260-.015
August 24, 2011

English (Essay)
Indent you paragraph. I think I understnad what you are trying to say when you say helpless individuals but it makes you sound as though you are obliterating there rights. I don't think that most of your words are biased, I think they are descriptive and I think that is ...
August 24, 2011

chemistry
A NASA satellite showed that in 2003 the ozone hole was much larger than it was in 2002. The 2003 hole measured 1.04 x 107 mi2 in diameter, while the diameter of the 2002 hole was 6.9 x 106 mi2 Calculate the difference in size between the two holes in square meters.
June 26, 2011

Microeconomics
When is international trade an opportunity for workers?
June 4, 2011

Finance
Having previously identified the location of its Greenfield investment, Acme, a multi-billion public MNE that is incorporated in the U.S., must next obtain external financing for its proposed overseas production facility. It has been estimated that the acquisition will cost \$...
May 27, 2011

science
(1) what measurements and what calculation would you need to make in order to determine the density of a rectangular wooden block? (2) a student announced that she had made a sample of a new material that had a density of 0.85g/cm3. from the inforation given, are you able to ...
March 29, 2011

science
(1) what measurements and what calculation would you need to make in order to determine the density of a rectangular wooden block? (2)
March 29, 2011

math
find the slope of the line given by each equation (1) 7x+13y=91 (2) 7-3y=9x
March 29, 2011

statistics
The participants in a weight-loss class lost the following weights (in pounds) after three weeks of dieting:3,6,0,3,0,0 Assuming that these weights constitute an entire population, find the standard deviation of the population. Round your answer to at least two decimal places...
March 28, 2011

if you know that AB=0 and A not=to B, what can you say about the equation Ax+By=1? Describe the graph.
March 21, 2011

math
if 2/5 of my money is \$4.00 how much is 1/2 of my money.
March 17, 2011

math
if 2/5 of my money is \$4.00 how much is1/2 OF MY MONEY
March 17, 2011

C++
int x; char* y,z; cout<<"Please enter number: "<<endl; cin>>x; if (x<20) y[x-1]={"one","two",...,"nineteen"}; else if((x/10)==2) z[x%10]={"one","two",...,"nine"}; y[]={"twenty - &...
February 22, 2011

Numerical Analysis
Using the bisection method, Newton’s method, and the secant method, find the largest positive root correct to three decimal places of x3 − 5x + 3 = 0. (All roots are in [−3,+3].)
February 21, 2011

algebra
11b,6=b-5
January 23, 2011

algebra
3/x-5=10/x+2
January 23, 2011

math
3 10 ____ = ____ x-5 x+2
January 23, 2011

Pre-Calc
Thank u both
December 9, 2010

Pre-Calc
Can someone show me how to do this please. I am stuck. find a number x such that e^2x – 12e^x =13
December 9, 2010

Pre-Calc
Thank you mathmate
December 9, 2010

Pre-Calc
I am stuck solving this problem, any help please..Many thanks find all numbers x that satisfy the given equation ln(2x) ------- =2 ln(3x)
December 9, 2010

Pre-Calc
I am seeking help with this problem Please...Thank you! Find the point on the line y=x+3 in the xy-plane that is closest to the point (3, 2)
December 7, 2010

Calculus
Use the given derivative to find all critical points of 'f' and at each critical point determine whether a relative maximum, relative minimum, or neither occurs. Assume that 'f' is continuous everywhere. f' (x) = (1-2x)/ ∛(x+3)
November 29, 2010

Calculus
Use the given derivative to find all critical points of 'f' and at each critical point determine whether a relative maximum, relative minimum, or neither occurs. Assume that 'f' is continuous everywhere. f' (x) = (1-2x)/ ∛(x+3) ∛(x+3)in words is...
November 29, 2010

Calculus
Use implicit differentiation to show dy/dx = [(1-xy)cot(y)]/[x^2 cot(y) + xcsc^2(y)] if xy = ln(x cot y).
November 13, 2010

Geometry
If you have 4 pencils, and I have 7 apples, how many pancakes will fit on the roof? Answer: Purple, because aliens don't wear hats.
November 7, 2010

Q. x^-4/5=16 What is x Q. Suppose 0<a<1. Arrange the following from smallest to largest z^-a,z^a,z^1/a,z^-1/8.
April 8, 2010

calculus
Prove that the limit as n approaches infinity of ((n!)^2)/(2n)! is 0. I'm thinking that you have to use the squeeze theorem, but I'm not quite sure how. help please?
April 6, 2010

math
Prove that the limit as n approaches infinity of ((n!)^2)/(2n)! is 0. I'm thinking that you have to use the squeeze theorem, but I'm not quite sure how. help please?
April 6, 2010

social studies
how do reform leaders today try wo win support for their causes? thanks
March 30, 2010

algebra
simplify and write with only positive exponents 1. x to yhe negitive six power times x to the fifth power 2. y to the negitive twelth power divided by 7y to the fifth power
March 24, 2010

Fractions
I'm pretty sure its 4
March 24, 2010

Physics
It says it itself: drum diameter = wavelength for 18.5kHz wavelength = V/f = 330/18500 (metres) or 1.78 cm
February 21, 2010

math
amy drove her car the same distance in six hours that juan drove his car in 5 1/2 hours. find the speed (rate) of amy's car, given that she drove 5 mi/h slower than juan.
September 16, 2009

math
150>4s+2*3s + 2*(15-5s) solve for s
September 14, 2009

math
Now the largest: Perimerter sum <150 150>4s+2w+2l 150>4s+2*3s + 2*(15-5s) solve for s, then w, then l.
September 14, 2009

Math
a rectangle is 3 times as wide as a square. the rectangle's length is 15 ft shorter than 5 times the square's length. Given that the sum of the two perimeters must be less than 150 ft, find the set of all possible lengths for the rectangle
September 14, 2009

english
is there a website for summary notes for old jules by mari sandoz?
September 14, 2009

english
does anyone know where i can find book notes on old jules by mari sandoz?
September 14, 2009

Math
find three consecutive even intergers for which the sum of the first two integers is greater than 9 more than the third integer, and the sum of the first and third integers is less than 17 more than the second integer
September 14, 2009

geometry
what is the area of a square with a radius of 9? I think the answer is 18 square or 324 Thank you
May 6, 2009

chemistry
determine wheter each of the following reactions occur. 2Ni(s) + MgSO4(aq)---> if it doesnt occur explain why
April 16, 2009