# Posts by ama

Total # Posts: 63

**SPANISH**

Daniel se está afeitando.

*July 27, 2016*

**Algebra probability**

Helena has a set of number cards numbered 1 through 10. If Helena randomly draws two cards from the deck, what is the probability that she will draw an odd number and then a two? The answer i had was 1/18, but its not on there, so i need help and im confused.

*April 9, 2015*

**physics**

Three point charge are located at a line 20cm with charge q1= -3uC, q2= +4uC, q3= -7uC. Determine the magnitude of the force.

*January 31, 2015*

**math**

10/2

*January 15, 2014*

**math**

A hot water cylinder whose length is 1.12m is to hold 200 liters.Find the diameter of the cylinder in millimeters.

*August 13, 2013*

**Quantum Physics**

Did anyone get this: If the first qubit is in the state 2/sqrt(5)|0> - 1/sqrt(5)|1> and the second qubit is in the state 1/sqrt(2)|0> - i/sqrt(2)|1>, what is the state of the composite system?

*March 11, 2013*

**morrisville**

Problem 3: Baggage Name your source code file Bags.py. You will write a program that simulates the actions of luggage handling for a large aircraft. As bags arrive they are loaded into containers. Each bag has a different weight and each container can hold a maximum amount of ...

*February 14, 2013*

**chemistry**

When 4.167 g of a unknown compound is added to 34.1 g of a particular solvent, the freezing point of that solvent decreases by 0.8 °C. Determine the molar mass of the unknown compound. (The freezing point constant of the solvent is 2.82 °C/m).

*January 28, 2013*

**precalculus**

Find all solutions of the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to two decimal places where appropriate.) tan^2 θ − 3 = 0

*November 27, 2012*

**precalculus**

Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to two decimal places where appropriate.) tan θ = - root of 3/3

*November 27, 2012*

**precalculus**

Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to two decimal places where appropriate.) sin θ = root 2/2 and List six specific solutions.

*November 27, 2012*

**precalculus**

Find the horizontal and vertical components of the vector with the given length and direction, and write the vector in terms of the vectors i and j. |v| = 24, θ = 30°

*November 25, 2012*

**chemistry**

When aqueous solutions of iron (III) sulfate (Fe2(SO4)3) and sodkum hydroxide were mixed, a precipitate formed. What is the precipitate?

*November 25, 2012*

**precalculus**

Find the vertices, foci, and asymptotes of the hyperbola. y^2 /9 - x^2/16 =1

*November 24, 2012*

**precalculus**

Find the vertices, foci, and asymptotes of the hyperbola. x^2/7 - y^2 = 1

*November 24, 2012*

**precalculus**

Find the vertices, foci, and asymptotes of the hyperbola. 16x2 − 9y2 = 144

*November 24, 2012*

**precalculus**

Find the first five terms of the given recursively defined sequence. an = 3an − 1 + 9 and a1 = 2

*November 22, 2012*

**precalculus**

Find the nth term of a sequence whose first several terms are given. 6, 8, 6, 8, 6, 8, . . .

*November 22, 2012*

**precalculus**

Find the first six partial sums S1, S2, S3, S4, S5, S6 of the sequence. 1/2, 1/2^2, 1/2^3, 1/2^4'...

*November 21, 2012*

**precalculus**

Find the first six partial sums S1, S2, S3, S4, S5, S6 of the sequence. 2, 5, 8, 11, . . .

*November 21, 2012*

**precalculus**

Verify the identity. csc t − sin t/csc t= cos2 t

*November 13, 2012*

**precalculus**

Write the trigonometric expression in terms of sine and cosine, and then simplify. cos u + sin u tan u

*November 13, 2012*

**precalculus**

Find the focus, directrix, and focal diameter of the parabola. x2 = 5y focus (x, y) = 0, 5/4 directrix:y=-5/4 focal diameter=5 Sketch its graph? my answers seem to be correct but i cannnot sketch the graph correctly.

*November 13, 2012*

**precalculus**

Find the focus, directrix, and focal diameter of the parabola. y2 = 8x

*November 13, 2012*

**precalculus**

Use the elimination method to find all solutions of the system of equations. (Order your answers from smallest to largest x, then from smallest to largest y.) x − y2 + = 0 2x2+ y2 −9 = 0

*November 4, 2012*

**biochemistry**

Enzyme X is a highly pigmented protein that imparts the characteristic color to certain blue-green algae. It also facilitates a reaction necessary to the survival of this species; we can follow the kinetics of this reaction by measuring the conversion of Substance X to ...

*November 3, 2012*

**biochemistry**

Enzyme X is a highly pigmented protein that imparts the characteristic color to certain blue-green algae. It also facilitates a reaction necessary to the survival of this species; we can follow the kinetics of this reaction by measuring the conversion of Substance X to ...

*November 2, 2012*

**precalculus**

If a projectile is fired with velocity v0 at an angle θ, then its range, the horizontal distance it travels (in feet), is modeled by the function R(θ) = v02 sin 2θ 32 . If v0 = 2600 ft/s, what angle (in degrees) should be chosen for the projectile to hit a ...

*October 28, 2012*

**precalculus**

If a projectile is fired with velocity v0 at an angle θ, then its range, the horizontal distance it travels (in feet), is modeled by the function R(θ) = v02 sin 2θ 32 . If v0 = 2600 ft/s, what angle (in degrees) should be chosen for the projectile to hit a ...

*October 28, 2012*

**precalculus**

Use a Double- or Half-Angle Formula to solve the equation in the interval [0, 2π). (Enter your answers as a comma-separated list. Round your answers to three decimal places where appropriate.) sin 2θ + sin θ = 0

*October 28, 2012*

**calculus**

Use the method of cylindrical shells to find the volume V generated by rotating the region bounded by the given curves about the specified axis. 27y = x3, y = 0, x = 6

*September 11, 2012*

**calculus**

Use the method of cylindrical shells to find the volume V generated by rotating the region bounded by the given curves about the specified axis. 27y = x3, y = 0, x = 6

*September 11, 2012*

**chemistry**

3) The melting point range of an unknown substance was determined to be 120-180 degree celcius. what can you tell about the purity of the unknown

*July 18, 2012*

**chemistry**

1) a student used 3.50 g of salicylic acid. calculate theoretical yield 2) the actual yield (from experiment) was found to be 1.50 g less than the theoretic yield (mass), calculate the percent yield 3) t

*July 18, 2012*

**chemistry**

why is it unwise to boil the oxolate solution in preparation for it's titration with permanganate

*July 18, 2012*

**Math**

37-32-2-47-81

*July 16, 2012*

**chemistry**

in a particular experiment, 150.0 g of ammonium chloride were reacted with 290.0 g of barium hydroxide octahydrate, producing 157.2 g of water 1. find the limiting reagent in this situation 2. calculate the theoretical yield of water 3. calculate the percent yield of water 4. ...

*July 14, 2012*

**precalculus**

find all solutions of each equations a) cos2x=square root of 3/2 b)cos 2theta/3 =-1 c) cot 3 theta /2 = -square root of 3 d) sin (2x-pie/4) = square root of 2/2

*July 10, 2012*

**precalculus**

write each expression as the sine, cosine or tangent of a double angle. then find the exact value of the expression. a. 2sin 22.5 cos 22.5 b. cos^2 105- sin^2 105

*July 6, 2012*

**precalculus**

sinθ=12/13, θ lies in quadrant II. Find the exact value of sin2θ, cos 2θ, tan2θ

*July 1, 2012*

**precalculus**

Write each expression as sine, cosine, or tangent of an angle. Then find the exact value of the expression tan 50-tan20/1+ tan 50 tan20

*July 1, 2012*

**Linear Programming**

Finco must determine how much investment and debtto undertake during the next year. Each dollar invested reduces the NPV of the company by 10¢, and each dollar of debt increases the NPV by 50¢ (due to deductibility of interest payments). Finco can invest at most $1 ...

*May 14, 2012*

**spanish**

Daniel se está afeitando.

*February 8, 2012*

**Physics High School Rotational Motion**

A wheel has a radius of 2.2 m. How far (path length) does a point on the circumference travel if the wheel is rotated through an angle of 190 rad? Answer in units of m

*February 2, 2012*

**Physics (High School)**

A 7.24 g bullet moving at 636 m/s penetrates a tree to a depth of 4.87 cm. Use energy considerations to find the average frictional force that stops the bullet. Answer in units of N B) Assuming that the frictional force is constant how much time elapsed between the moment of ...

*December 19, 2011*

**Physics**

A dragster and a driver together have mass of 942.2 kg. the dragster starting from rest attains a speed of 25.5m/s in 0.56 s. 1. find the average acceleration of the dragster during this time interval? I really need the formula 2. What horizontal force does the seat exert on ...

*October 20, 2011*

**Lotto 5/90 maths**

50-36-12-89-14 that is past result to get next number

*April 12, 2011*

**physics**

a hockey puck is given the initial speed of 10 m/s. If the coefficient of kinetic friction between the ice and puck is 0.10, how far will the puck slide before stopping?

*December 14, 2010*

**physics**

A diver runs horizontally off the end of a diving board with an initial speed of 1.75 sec. If the diving board is 3.0 m above the water line, what is the diver’s speed just before she enters the water?

*December 7, 2010*

**physics**

If a particle goes from location Xi = 10i + 5j + 2k to location Xf = 15i – 7j + 10k in a time ∆t = 5 sec. what is the average velocity and average speed of the particle?

*December 7, 2010*

**physics**

A model rocket is launched with an initial velocity of 10 m/sec at an angle of 45° to the ground. What is the total time of flight? What is the highest point in its trajectory? What is the horizontal range archieved?

*December 7, 2010*

**physics**

A hockey puck sliding on the ice with velocity 10m/sec is stopped by a goalie in 0.10sec. what is the goalie stopping distance ∆x in doing so.

*December 7, 2010*

**physics**

A phonograph record of radius 6 cm and mass 15 g is rotating with an angular velocity of 33.33 rev/min. A Penny of mass 1 g suddenly falls on the record and lands at the radial distance of 4 cm from the record’s center. What is the angular velocity after the collision.

*December 5, 2010*

**physics**

A solid sphere of radius 3 cm and mass of 100 g rolls down a 30 degree incline from a height of 1 m. A hoop of the same mass and radius rolls down the same incline from the same height. What is the linear velocity of each body at the bottom of the incline? From what height ...

*December 5, 2010*

**physics**

A steel ball bearing the radius 1 cm is rolling along a table with speed 20 cm/sec when it starts to roll up an incline. How high above the table level will it rise before stopping? Ignore friction losses.

*December 5, 2010*

**physics**

A wheel is roatating freely at an angular speed of 800 rev/min on a shaft of negligible moment of inertia. A second wheel initially at rest and with twice the moment of inertia of the first, is suddenly coupled to the same shaft. (a) what is the angular speed of the resultant...

*December 5, 2010*

**mifflin**

informations about the articles of confederatiom

*December 1, 2010*

**physic**

tortoise= .12 m/s hare= .12 x 20= 2.4m/s rest= 2.0 minutes= 120 seconds part A 0.12 t = (2.4)(t-120 seconds)-.25 solve for t= for part B use part A's answer and multiply by the tortoise's speed.

*September 24, 2009*

**chem**

write the balanced half-reaction for the conversion of Fe(s)to Fe+2(aq)

*May 11, 2008*

**chem**

determine the oxidation number of MgBR2(s) and NH4No3(s)

*May 11, 2008*

**history**

i have to make a newspaper around the year 1830. Where can I go to find accurate free info about "NEWS" in that time period?

*November 21, 2007*

**AP Biology**

The KOH absorbed the carbon dioxide and caused it to form a precipitate at the bottom of the vial.

*November 11, 2007*

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