Monday
September 22, 2014

Posts by Perry


Total # Posts: 38

Chemistry
2.44
May 29, 2013

Science
How can weather observations be used to discover the effect of a mountain range on the pattern of precipitation?
May 3, 2013

Math
The difference between two numbers is 34. The larger exceeds 3 times the smaller by 4. Find the numbers . Use let statements
January 19, 2013

Math
Perimeter of pentagon is 9x-1. Find length of missing side. Sides are 3x-4; 2x+3; x+1; x-5
January 17, 2013

Physics
A jet plane is flying with a constant speed along a straight line, at an angle of 26.5° above the horizontal, as Figure 4.30a indicates. The plane has weight whose magnitude is 86500 N, and its engines provide a forward thrust of 103000 N. In addition, the lift force (...
October 25, 2012

Physics
Part a of the drawing shows a bucket of water suspended from the pulley of a well; the tension in the rope is 107.5 N. Part b shows the same bucket of water being pulled up from the well at a constant velocity. What is the tension in the rope in part b?
October 25, 2012

physics
An elevator is moving upward at 1.20 m/s when it experiences an acceleration 0.25 m/s2 downward, over a distance of 0.71 m. What will its final velocity be?
September 2, 2012

physics
A small block with mass 0.0400 kg slides in a vertical circle of radius 0.0700 m on the inside of a circular track. There is no friction between the track and the block. At the bottom of the block's path, the normal force the track exerts on the block has magnitude 3.85 N...
June 4, 2012

Geometry Math
FInd the length between the points and the magnitude of that vector will give you the distance. sqrt((0-(-1))^2+(5-2)^2+(1-2)^2)
June 4, 2012

chem
If a sample of Mg3(PO4)2, has a mass of 0.600 g, what is the mass of phosphorus in that sample?
May 15, 2012

chem
Bromine consists of two major isotopes with the following percent abundances and atomic masses: 79Br (50.54% and 78.918 amu) and 81Br (49.46% and 80.916 amu). Calculate the average atomic mass of bromine.
December 12, 2011

math
1367.00+3.6%=
December 10, 2011

chemistry
The chemical substance in natural gas is a compound called methane. Its molecules are composed of carbon and hydrogen and each molecule contains four atoms of hydrogen and one atom of carbon. In this compound, 0.33597g of hydrogen is combined with 1g of C12. Use this ...
August 23, 2011

physics
The velocity of waves on a string is 97 m/s. If the frequency of standing waves is 476 Hz, how far apart are two adjacent nodes?
May 1, 2011

Math
6b@ + 7b +2
April 21, 2011

physics.
a ball is thrown upward with an initial velocity of 38.9 m/s from the edge of a cliff of height H. The ball lands on the ground at the base of the cliff 12.8 s after it is thrown.
October 31, 2010

chemistry
How many grams of NH3 will have the same number of molecules as 15.0 grams of C6H6?
September 20, 2010

diagramming a sentence
Several urgent callers distracted the doctor
January 14, 2010

Physics
34.8 min
November 15, 2009

AP Physics (circular motion)
The moon revolves about the Earth in a trajectory that is very nearly a circle of radius r = 384,401 km, and requires 27.3 days (23.4 x 10^5 seconds) to make a complete revolution. What is the acceleration of the moon toward the Earth?
September 24, 2009

pre-calculus
What are your window settings?
September 18, 2009

pre-calculus
Can anybody figure out how to find the maximum value on this? -b/2a doesn't work either since it's not a 2nd degree polynomial.
September 18, 2009

pre-calculus
Oops, that was a typo. I tried taking 4x out and typed in 36x^2. That should be 144x^2. Aka, the same equation as yours.
September 18, 2009

pre-calculus
That's the same exact equation but you took out an x.
September 18, 2009

pre-calculus
I tried graphing but when I put it in I get a negatively shaped parabola (below the x-axis) and I don't know how to find the maximum value for a parabola like that.
September 18, 2009

pre-calculus
An open box is made from a square piece of material 36 inches on a side by cutting equal squares from the corners and turning up the sides. Use your calculator to find the maximum volume this box can hold. I got the equation 4x^3-36x^2+1296x = V But when I put it in the ...
September 18, 2009

physics
The question is a child slides down a slide with a 28 degree incline and at the bottom her speed is precisely half what it would have been if the slide had been frictionless. Calculate the coefficient of the kinetic friction between the slide and the child.
September 18, 2009

science
What is the ecological uniqueness of the plant and animal life in the Galapagos Islands? ... What kind of plant life, animal life and geology of the ecosystem ...
September 17, 2009

physics
A stunt driver wants to make his car jump over eight cars parked side by side below a horizontal ramp. (a) With what minimum speed must he drive off the horizontal ramp? The vertical height of the ramp is 1.5m above the cars, and the horizontal distance he must clear is 20m. (...
September 14, 2009

physics
When you are running and want to stop quickly, you must decelerate quickly. What is the origin of the force that causes you to stop? Estimate the maximum rate of deceleration of a person running at top speed to come to rest.
September 11, 2009

physics
In archery, should the arrow be aimed directly at the target? How should your angle of aim depend on the distance to the target? I know the answer is no but I don't know how to prove that.
September 2, 2009

physics
A runner hopes to complete the 10,000m run in less than 30 minutes. After exactly 27 minutes, there are still 1100m to go. The runner must then accelerate at 0.20 m/s^2 for how many seconds in order to achieve the desired time?
August 30, 2009

Chemistry
Hi GK! Does this mean that there are 4 molecules with the E configuration? All but molecules four are E configurations? Thanks So Much For Your HElp!
July 3, 2009

Chemistry
Hello! I have a question that leaving me stumped. So E means opposite and Z means together. In order to do this alternate cis/trans arrangement you have to order molecules a priority either 1 and 2. You have to go along either side of double bond and determine priority. I'...
July 3, 2009

Calc
Estimate the area under the graph of f(x)= x^2 + 2 x from x=4 to x=10 using 3 approximating rectangles and left endpoints.
April 22, 2009

Financial Management
HI, could anyone help with this please. :) 2. Find the following values: a) An intial $500 compounded for 10 years at 6 percent b) An intial $500 compounded for 10 years at 12 percent c) The present value of $500 due in 10 years at a 6 % discount rate. d) The present value of...
November 3, 2007

Financial Management
Hi, would anyone be willing to help with this. Thanks :) 2. Find the following values: a) An intial $500 compounded for 10 years at 6 percent b) An intial $500 compounded for 10 years at 12 percent c) The present value of $500 due in 10 years at a 6 % discount rate. d) The ...
November 3, 2007

Biology
thank you
October 26, 2006

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