Monday
March 27, 2017

# Posts by Mable

Total # Posts: 37

calculus
find dt/dx t=((a^2+x^2)^1/2)/v1 + ((d^2+b^2)^1/2)/v2
March 2, 2017

calculus-snell's law
Suppose A light ray starts at the point A = (0,a) in an uniform medium 1 where the speed of light is c1 and then passes through an uniform medium 2 where the speed of light is c2 reaching point B = (d, ?b). The line separating the two media is the x-axis; HINTS ONLY 1) what is...
March 2, 2017

Algebra
collect like terms and simplify 4x^2-5x^2=-x^2 -3x=8x-11x 8=6+2 final answer : -x^2-3x +8
March 1, 2017

Algebra
collect like terms -- remember that double negatives makes a positive
March 1, 2017

calculus- optimization
A rectangle is inscribed into a semi circle at radius 2. What is the largest area it can have and what are the dimensions Answers Area= 4 max base =2sqrt2 height = sqrt2 Help is always appreciated :)
March 1, 2017

calculus
it is assumed that f is differentiable and that w has an absolute maximum at t0 w(t)= f(t)/(c+t) derivative is f'(t)(c+t)-f(t)/(c+t)^2 Show that f(t0) = f?(t0)(C + t0). I'm having a bit of trouble in the above question. I keep getting f(t0)= (c+t0)-f'(t0) instead ...
March 1, 2017

calculus
it is assumed that f is differentiable and that w has an absolute maximum at t0 Show that f(t0) = f?(t0)(C + t0).
February 28, 2017

calculus
w(t)= f(t)/(c+t) w'(t)=? I got f'(t)(c+t)-f(t)/(c+t)^2 as the derivative and I'm having a hard time trying to prove that f(t_0) = f'(t_0) (C+t_0) Help is always appreciated :)
February 28, 2017

calculus
One litre of water at 0 degrees Celsius will have a different volume at higher temperatures. For a temperature 0 ? T ? 30 (in Celsius) this volume (in litres) is well approximated by the function V = ?aT 3 + bT 2 ? cT + 1 using the coefficients a = 9.8 × 10?8, b = 3.5 &...
February 21, 2017

math plzzz help quick
(1) x-y=-11 (2) y+7=-2x rearrange the equation 1 to get y by itself -> x=-11+y substitute that in equation 2 y+7=-2(-11+y) and solve for y
February 6, 2017

physics
A positive charge with Q1= +2?10-6 C and a negative charge Q2 = -1×10-6 C are located at an equal distance 0.1m from the origin (see below). A third charge Q3=+1?10-6C is located at the origin. Calculate the magnitude of the net force exerted on charge Q3 Calculate the ...
December 12, 2016

physics
A 2 kg block with initial velocity +2m/s collides with a stationary 6 kg block with initial velocity 0m/s on a frictionless surface. After the collision, the 2 kg block is moving at –1 m/s and the 6kg block is moving to the right at +1 m/s. Show that the total momentum is...
December 12, 2016

physics
A 100 kg car is traveling at 20m/s over the top of a circular hill as shown below. The radius of the circle is 200 m. What force does the ground exert on the car at the top of the hill? After reaching the top of the hill, the car descends a vertical distance of 20 m. What is ...
December 12, 2016

physics
A 2 kg block is being pulled by a rope with a tension of 3N at an angle of 45Â° as shown. The coefficients of friction are Î¼k=0.4 and Î¼s=0.5. Does the block slide or not?
December 12, 2016

physics
A 0.035 kg spherical oil droplet has charge of +1×10-7C. A uniform electric field is acting upwards as shown below. What strength of electric field is required to make the sphere float in the air without moving?
December 12, 2016

physics
A 1000 kg car is initially at rest. If the motor does 10,000J of work on the car, what is the car’s final speed? (Neglect friction, and assume that the car is on level ground.)
December 12, 2016

physics
A 5kg block has an initial velocity of 15 m/s and is sliding along a surface with friction. Eventually the block comes to rest. what is the change in thermal energy of the block and the surface ?
December 12, 2016

physics
a stone that is thrown near the surface of the earth. There is no air resistance. Position increases in the up direction. The initial velocity is 30 m/s at 30 degrees above the horizontal. what is the velocity when the stone reaches its maximum height ? what is the ...
December 12, 2016

physics
Car A with a mass of 1000kg is travelling east at 25m/s when it collides with car B, 2000kg, travelling north at 15m/s. After the collision, the two cars stick together and have the same velocity. Assume that they slide without friction after collision. (a) What is the final ...
November 27, 2016

geometry
A drug company is testing new toothpaste in 2 flavors, regular and cinnamon. In a sample of 193 people, 121 liked regular, 112 people liked cinnamon, and 46 liked both.
January 22, 2013

science
how many atoms of magnesium are in the magnesium molecule?
October 29, 2012

hhs 265 accounting
calculating the current ratio of the XYZ nonprofit corporation balance sheet using appendix b.
March 7, 2009

chemistry
How many grams of copper is deposited from an aqueous solution of copper sulfate, (CuSO4(aq)), by passing one mole of electrons into a copper plating cell? A. 254g B. 127g D. 42.3g E. 31.8g
May 24, 2008

chemistry
The compound with the highest boiling point will be which of the following? A.CH3Cl B.CH3Br C.CH4 D.CH3F
May 13, 2008

chemistry
Carbon is able to form large numbers of organic compounds because carbon can A.form 4 bonds B.form single, double and triple bonds C.form chains, rings, spheres and sheets D.the carbon-carbon bond is very stable E.all answers are correct
May 13, 2008

chemistry
The melting point of a compound is not influenced by which of the following? A. polarity B. electronegativity of its atoms C. Van der Waals forces D. hydrogen bonds E. isotope of carbon
May 13, 2008

chemistry
An amine is characterized by what functional group? A.-CO2CH3 B.-NH2 C.-CO2H D.-CHO E.-OH
May 13, 2008

chemistry
Esters are A.found in some medicines B.often fragrant C.essential oils in fruits and flower D.found in some types of flavorings E.all answers are correct
May 13, 2008

chemistry
Suggest a type of reaction and the conditions required to breakdown polyamides into their monomers.
May 9, 2008

chemistry
Draw three repeating units of the condensation polymer made from ethanedioic acid and ethanediol. if anyone has a weblink that illustrates this may you please send it?
May 9, 2008

chemistry
Suggest a type of reaction and the conditions required to breakdown polyamides into their monomers.
May 9, 2008

chemistry
Construct the following using molecules of your choice: a) a polyester and b) a polyamide. Each drawing should have four monomers and should be original in its structure. Your polymers can not be biochemical (carbohydrate, lipid, protein, etc.). Identify the reactions as ...
May 9, 2008

chemistry
What types of linkage joins the nucleotides a) within a single DNA strand and b) between two single DNA strands?
May 7, 2008

chemistry
Explain in terms of molecular structure why sugars have a relatively high melting point compared to hydrocarbons of a similar size.
May 7, 2008

chemistry
Explain in terms of molecular structure why sugars have a relatively high melting point compared to hydrocarbons of a similar size.
May 7, 2008

algebra
Quartics using P(X) = af(b(x-c)+d Recall Q(X) = (x-2)(x-1)(x+1)(x+2) a)Choosing a (i) Rewrite Q(x) for a. Let b = 1, c = 0 and d = 0 (ii) Make 3 copies of the same function on your calculator Let a= -1, 1 and 2 Your equations are Y1= __________(a=-1) Y2= __________(a=1) Y3= ...
May 7, 2008

chemistry
What functional group(s) must be present in a monomer of a condensation reaction?
May 5, 2008

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