Ama
Popular questions and responses by Ama
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.
asked on November 13, 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
asked on October 28, 2012 
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?
asked on December 7, 2010 
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
asked on October 20, 2011 
math
The length of a rectangular field is 25m more than it width. The perimeter of the field is 450m. What is the actual width and length
asked on August 23, 2017 
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
asked on May 14, 2012 
chemistry
When aqueous solutions of iron (III) sulfate (Fe2(SO4)3) and sodkum hydroxide were mixed, a precipitate formed. What is the precipitate?
asked on November 25, 2012 
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?
asked on December 14, 2010 
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'...
asked on November 21, 2012 
precalculus
Solve the given equation. (Enter your answers as a commaseparated list. Let k be any integer. Round terms to two decimal places where appropriate.) sin θ = root 2/2 and List six specific solutions.
asked on November 27, 2012 
precalculus
Find the vertices, foci, and asymptotes of the hyperbola. 16x2 − 9y2 = 144
asked on November 24, 2012 
Physics
The wheel of Fortune. a contestant gives the wheel an initial angular velocity of 5.95 rad/s and the wheel stops after 5.8s of constant acceleration. Determine the panel (e.g. $600 or bankrupt) that the yellow pointer will be on when the wheel stops.
asked on March 25, 2020 
precalculus
Use a Double or HalfAngle Formula to solve the equation in the interval [0, 2π). (Enter your answers as a commaseparated list. Round your answers to three decimal places where appropriate.) sin 2θ + sin θ = 0
asked on October 28, 2012 
precalculus
Find the first five terms of the given recursively defined sequence. an = 3an − 1 + 9 and a1 = 2
asked on November 22, 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
asked on December 19, 2011 
precalculus
Find the focus, directrix, and focal diameter of the parabola. y2 = 8x
asked on November 13, 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
asked on July 18, 2012 
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
asked on April 9, 2015 
precalculus
sinθ=12/13, θ lies in quadrant II. Find the exact value of sin2θ, cos 2θ, tan2θ
asked on July 1, 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
asked on July 6, 2012 
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
asked on December 5, 2010 
precalculus
Find the first six partial sums S1, S2, S3, S4, S5, S6 of the sequence. 2, 5, 8, 11, . . .
asked on November 21, 2012 
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
asked on December 5, 2010 
SPANISH
Daniel se está afeitando.
asked on July 27, 2016 
chemistry
3) The melting point range of an unknown substance was determined to be 120180 degree celcius. what can you tell about the purity of the unknown
asked on July 18, 2012 
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.
asked on December 5, 2010 
physics
Three point charge are located at a line 20cm with charge q1= 3uC, q2= +4uC, q3= 7uC. Determine the magnitude of the force.
asked on January 31, 2015 
precalculus
Find all solutions of the given equation. (Enter your answers as a commaseparated list. Let k be any integer. Round terms to two decimal places where appropriate.) tan^2 θ − 3 = 0
asked on November 27, 2012 
precalculus
Solve the given equation. (Enter your answers as a commaseparated list. Let k be any integer. Round terms to two decimal places where appropriate.) tan θ =  root of 3/3
asked on November 27, 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 (2xpie/4) = square root of 2/2
asked on July 10, 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
asked on February 2, 2012 
precalculus
Find the nth term of a sequence whose first several terms are given. 6, 8, 6, 8, 6, 8, . . .
asked on November 22, 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
asked on September 11, 2012 
precalculus
Write each expression as sine, cosine, or tangent of an angle. Then find the exact value of the expression tan 50tan20/1+ tan 50 tan20
asked on July 1, 2012 
chem
determine the oxidation number of MgBR2(s) and NH4No3(s)
asked on May 11, 2008 
math
A hot water cylinder whose length is 1.12m is to hold 200 liters.Find the diameter of the cylinder in millimeters.
asked on August 13, 2013 
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°
asked on November 25, 2012 
precalculus
Verify the identity. csc t − sin t/csc t= cos2 t
asked on November 13, 2012 
chem
write the balanced halfreaction for the conversion of Fe(s)to Fe+2(aq)
asked on May 11, 2008 
chemistry
why is it unwise to boil the oxolate solution in preparation for it's titration with permanganate
asked on July 18, 2012 
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.
asked on December 7, 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?
asked on December 5, 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?
asked on December 7, 2010 
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
asked on February 14, 2013 
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
asked on September 11, 2012 
precalculus
Find the vertices, foci, and asymptotes of the hyperbola. y^2 /9  x^2/16 =1
asked on November 24, 2012 
biochemistry
Enzyme X is a highly pigmented protein that imparts the characteristic color to certain bluegreen 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
asked on November 2, 2012 
Physics
An object of mass M is subject to two constant forces: F1, pointing in the xdirection, and F2, pointing in the ydirection. Show that the motion is one of constant acceleration. Find the magnitude and direction of this uniform acceleration. (Use the
asked on April 3, 2017 
precalculus
Write the trigonometric expression in terms of sine and cosine, and then simplify. cos u + sin u tan u
asked on November 13, 2012 
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?
asked on December 7, 2010 
precalculus
Find the vertices, foci, and asymptotes of the hyperbola. x^2/7  y^2 = 1
asked on November 24, 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
asked on November 4, 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
asked on July 14, 2012 
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).
asked on January 28, 2013 
biochemistry
Enzyme X is a highly pigmented protein that imparts the characteristic color to certain bluegreen 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
asked on November 3, 2012 
mifflin
informations about the articles of confederatiom
asked on December 1, 2010 
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?
asked on November 21, 2007

Physics
Anyone???
posted on March 25, 2020 
Spanish
What is the correct form of good in
posted on November 10, 2019 
Spanish
What is the correct form of goof in
posted on November 10, 2019 
Chemistry
1.30
posted on August 29, 2017 
spanish
Daniel se está afeitando.
posted on July 27, 2016 
math
10/2
posted on March 14, 2016 
math
30
posted on September 21, 2015 
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)(t120 seconds).25 solve for t= for part B use part A's answer and multiply by the tortoise's speed.
posted on September 22, 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?
posted on March 18, 2013 
Math
373224781
posted on February 25, 2013 
Lotto 5/90 maths
5036128914 that is past result to get next number
posted on January 26, 2013 
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
posted on October 28, 2012 
AP Biology
The KOH absorbed the carbon dioxide and caused it to form a precipitate at the bottom of the vial.
posted on October 18, 2009