# Ama

Popular questions and responses by Ama
1. ## 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.

2. ## 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

3. ## 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?

4. ## 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

5. ## 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

6. ## 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

7. ## chemistry

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

8. ## 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?

9. ## 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'...

10. ## 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.

11. ## precalculus

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

12. ## 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.

13. ## 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

14. ## precalculus

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

15. ## 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

16. ## precalculus

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

17. ## 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

18. ## 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

19. ## precalculus

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

20. ## 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

21. ## 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

22. ## precalculus

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

23. ## 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

24. ## SPANISH

Daniel se está afeitando.

25. ## 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

26. ## 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.

27. ## physics

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

28. ## 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

29. ## 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

30. ## 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

31. ## 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

32. ## precalculus

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

33. ## 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

34. ## 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

35. ## chem

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

36. ## math

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

37. ## 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°

38. ## precalculus

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

39. ## chem

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

40. ## chemistry

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

41. ## 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.

42. ## 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?

43. ## 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?

44. ## 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

45. ## 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

46. ## precalculus

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

47. ## 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

48. ## Physics

An object of mass M is subject to two constant forces: F1, pointing in the x-direction, and F2, pointing in the y-direction. Show that the motion is one of constant acceleration. Find the magnitude and direction of this uniform acceleration. (Use the

49. ## precalculus

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

50. ## 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?

51. ## precalculus

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

52. ## 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

53. ## 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

54. ## 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).

55. ## 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

56. ## mifflin

informations about the articles of confederatiom

57. ## 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?

1. ## Physics

Anyone???

posted on March 25, 2020
2. ## Spanish

What is the correct form of good in

posted on November 10, 2019
3. ## Spanish

What is the correct form of goof in

posted on November 10, 2019
4. ## Chemistry

1.30

posted on August 29, 2017
5. ## spanish

Daniel se está afeitando.

posted on July 27, 2016
6. ## math

10/2

posted on March 14, 2016
7. ## math

30

posted on September 21, 2015
8. ## 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.

posted on September 22, 2013
9. ## 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
10. ## Math

37-32-2-47-81

posted on February 25, 2013
11. ## Lotto 5/90 maths

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

posted on January 26, 2013
12. ## 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
13. ## 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