Greg

Popular questions and responses by Greg
  1. physics

    A hypodermic syringe contains a medicine with the density of water (figure below). The barrel of the syringe has a cross-sectional area of 2.44 10-5 m2. In the absence of a force on the plunger, the pressure everywhere is 1.00 atm. A force vector F of

    asked on March 28, 2012
  2. Math

    A man has 2 pennies, 3 nickels, 1 dime and 2 quarters. How many different sums of money can he make using one or more of these 8 coins?

    asked on May 5, 2011
  3. PHYSICS

    Fig. 6-48 shows a conical pendulum, in which the bob (the small object at the lower end of the cord) moves in a horizontal circle at constant speed. (The cord sweeps out a cone as the bob rotates.) The bob has a mass of 0.038 kg, the string has length L =

    asked on March 1, 2008
  4. stats

    Find the probability of at least 2 girls in 10 births. Assume that male and female births are equally likely and that the births are independent events.

    asked on March 16, 2015
  5. Photography

    The overall impact of all of a photographs features is called what? A. Unity** B. Structure C. Aesthetic D. Emphasis

    asked on November 15, 2018
  6. Math

    If a baseball player has a batting average of 0.420, what is the probability that the player will get at least 2 hits in the next four times at bat?

    asked on February 28, 2016
  7. Difficult Trig Word Problem

    The displacement of a spring vibrating in damped harmonic motion is given by y(t) = 4e^-3t sin(2pi*t) where y = displacement and t = time with t greater than/equal to zero. Find the time(s) when the spring is at its equilibrium position (y=0). The number

    asked on November 14, 2012
  8. AP Physics

    A pole-vaulter approaches the takeoff point at a speed of 9.50 m/s. Assuming that only this speed determines the height to which he can rise, find the maximum height at which the vaulter can clear the bar.

    asked on November 13, 2010
  9. TRIG help quickly please

    Mark any solutions to the equation 2cos2x - 1 = 0. The answer can be more than one. Thank you π/8 -7π/4 15π/4 3π/4

    asked on January 14, 2014
  10. math - calc

    A conical water tank with vertex down has a radius of 12 feet at the top and is 26 feet high. If water flows into the tank at a rate of 30 {\rm ft}^3{\rm /min}, how fast is the depth of the water increasing when the water is 12 feet deep?

    asked on October 1, 2013
  11. Precalculus

    Find the distance along an arc on the surface of the earth that subtends a central angle of 1 minute. (1 minute = 1/60 degree) This is a nautical mile. Note that the radius of the Earth is 3960 miles and there are 1760 yards in a mile. Express your answer

    asked on September 10, 2012
  12. Math

    A rectangular swimming pool is bordered by a concrete patio. The width of the patio is the same on every side. The area of the surface of the pool is equal to the area of the patio. What is the width of the patio? (Length of Pool: 24 Width of Pool: 16)

    asked on February 3, 2016
  13. Algebra (Please check)

    PLEASE CHECK MY ANSWERS (: I just want to make sure I am doing this correctly __________________________________ Graph the system of constraints and find the value of x and y that maximize the objective function. Constraints: x ≥ 0 y ≥ 0 y ≤ (1)/(5)

    asked on September 17, 2012
  14. Algebra 2

    How would I find the sum of the geometric series given? 1/5 - 1/25 + 1/125

    asked on May 12, 2012
  15. Math

    A swimming pool is 40 feet long, 20 feet wide, 8 feet deep at the deep end, and 3 feet deep at the shallow end; the bottom is rectangular. If the pool is filled by pumping water into it at the rate of 40 cubic feet per minute, how fast is the water level

    asked on March 2, 2012
  16. Statistics

    A study of 40 bowlers showed that their average score was 186. The standard deviation of the population is 6. Find the 95% confidence of the mean score for all bowlers.

    asked on April 27, 2019
  17. Calculus

    A rectangular box with a square base and cover is to have a volume of 2500 cubic feet. If the cost per square foot for the bottom is $2, for the top is $3, and for the sides is $1, what should the dimensions be in order to minimize the cost?

    asked on December 10, 2017
  18. Math

    An object is projected directly upward from the ground. Its distance in feet from the ground in t seconds is s equals s=112t−16t^2 The object will be 160 feet from the ground after () ​second(s) and after () ​second(s). The object strikes the ground

    asked on April 18, 2016
  19. Math

    Find the adjusted balance due at maturity for a 90 day note of $15000 at 13.7% ordinary interest if a partial payment of $4000 is made on the 60th day of the loan.

    asked on January 27, 2015
  20. chemistry

    10. If the calcium oxide were obtained by the heating of calcium hydroxide, how much hydroxide would be needed to obtain the 15.0 g? 11. If the 15.0 g of calcium oxide in the above problems were allowed to react with water, what amount of calcium hydroxide

    asked on December 13, 2012
  21. calculus

    Consider the function f(x)=12x^5+30x^4–160x^3+5 . f(x) has inflection points at (reading from left to right) x=D , E , and F D= E= F=

    asked on November 25, 2008
  22. math

    The amount of money in an account with continuously compounded interest is given by the formula A = Pert, where P is the principal, r is the annual interest rate, and t is the time in years. Calculate to the hundredth of a year how long it takes for an

    asked on April 22, 2007
  23. algebra

    A math class has a total of 47 students. the number of females is 17 less than the numberof males. how many males and how many females are in class?

    asked on February 8, 2015
  24. Chemistry

    How many electrons will each element gain in forming an ion? a. Nitrogen ______ b. Oxygen ________ c. Sulfur _______ d. bromine _______

    asked on October 9, 2012
  25. English

    Hamlet: I need to look at the passages from Acts IV and V and assess their impact within the context of the whole play. I have already done so and it's giving me these questions using a passage. I need some help, please. :) Passage 1: " Now, whether it be

    asked on November 30, 2009
  26. Astronomy

    What part of the Solar System are you most interested in learning about?

    asked on February 11, 2020
  27. physics

    An electrical device contains a transformer. Its primary coil has 200 turns, and its secondary coil has 20 turns. If the device is plugged into a 120-volt line, what is the output voltage of the device?

    asked on November 2, 2015
  28. Physics

    An auditorium has dimensions 10m x 10m x 60m. How many moles of air fill this volume at STP? I'm stumped.

    asked on December 3, 2014
  29. Precalc/Trig Word Problem

    From the top of a 200-ft lighthouse, the angle of depression to a ship in the ocean is 23 degrees. How far is the ship from the base of the lighthouse?

    asked on October 8, 2012
  30. Precalc/Trig 1

    What equation would you use to show that the point ((square root of 11)/(6), (5/6))is on the unit circle?

    asked on October 8, 2012
  31. Precalculus

    he distance between 2 points (x1,Y1) and (x2,y2) is given by d = square root (x1-x2)^2 + (y1-y2)^2 a - pick 2 arbitrary points in 3 dimensions, (x1, y1, and Z1) and (x2,y2,z2) and plot these points. Not that there are 90 degrees between the xy, xz, and yz

    asked on September 14, 2012
  32. Physics

    A ball initially moving at 0.5m/s rolls down a straight slope, accelerating at 0.25m/s^2 for 4 sec, how far does the ball travel in this time?

    asked on June 16, 2011
  33. math

    a rectangular parking lot has a length that is 10 yards greater than the width. the area of the parking lot is 200 square yards.find the length and the width

    asked on February 5, 2011
  34. math

    could someone show me how to write this or set up this equation?2 ships sail from the same port, one sails dew east at 15 mph and the second sailed dew south at 20 mph, how far apart are the ships after 3 hours?

    asked on October 19, 2010
  35. Math

    2+3 add each number to itself plus one

    asked on September 26, 2016
  36. Check Answers Quick -Physics

    What causes the centripetal acceleration of an electron in a hydrogen atom? electrical attraction gravity friction

    asked on December 16, 2013
  37. chemistry science

    substrate concentration= 3.5mM (c2) buffer=0.4 ml 10mM PNPP stock= ?ml (V1) water=?ml enzyme= 0.2ml total volume =1ml (V2) I need help with a dilution, I understand that you would be using c1v1=c2v2 but im confused as to what we need to find the amount of

    asked on October 1, 2013
  38. Math

    Suppose the quantity demanded per week of a certain dress is related to price by the demand equation p=√75-2x. In order to maximize revenue, how many dresses should be made and sold each week?

    asked on May 6, 2013
  39. chem

    Given that Ka for HClO is 4.0 × 10-8 at 25 °C, what is the value of Kb for ClO– at 25 °C? Given that Kb for CH3CH2NH2 is 6.3 × 10-4 at 25 °C, what is the value of Ka for CH3CH2NH3 at 25 °C?

    asked on March 26, 2013
  40. Chemistry

    Can someone pls help me!! You decide to establish a new temperature scale on which the melting point of ammonia (-77.75 C ) is 0 A, and the boiling point of ammonia (-33.35 C ) is 200 A. What would be the boiling point of water in A ? What would be the

    asked on February 2, 2013
  41. Physics

    A thin, uniform rod is hinged at its midpoint. To begin with, one half of the rod is bent upward and is perpendicular to the other half. This bent object is rotating at an angular velocity of 6.8 rad/s about an axis that is perpendicular to the left end of

    asked on November 17, 2012
  42. Chemistry

    For the reaction IO3– + 5I– + 6H+ 3I2 + 3H2O the rate of disappearance of I– at a particular time and concentration is 2.8 x 10-3 M s-1. What is the rate of appearance of I2 in molarity per second?

    asked on July 31, 2012
  43. physics

    A crate of weight Fg is pushed by a force on a horizontal floor. (a) If the coefficient of static friction is μs, and is directed at angle θ below the horizontal, show that the minimum value of P that will move the crate is given by the following

    asked on October 17, 2011
  44. Physics

    An electron is at the origin. (a) Calculate the electric potential VA at point A, x = 0.410 cm. (b) Calculate the electric potential VB at point B, x = 0.820 cm. What is the potential difference VB - VA?

    asked on February 18, 2011
  45. algebra

    find the x and y intercepts: f(x)=-x^2 +3x+10

    asked on June 3, 2010
  46. ECON

    CAN ANYONE PLEASE HELP// 1. In the Country of Wiknam, the velocity of money is constant. Real GDP grows by 5 percent per year, the money stock grows by 14 percent per year, and the nominal interest rate is 11 percent. What is the real interest rate? 2. The

    asked on October 23, 2007
  47. econ--HELP!!

    QUESTION Consider an economy described by the following equations: Y=C+I+G Y=500 G=1,000 T=1,000 C=250+0.75(Y-T) I=1,000-50r a.In this economy, compute private saving, public saving, and national saving. b. Find the equilibrium interest rate. c. Now

    asked on October 21, 2007
  48. statistics

    An English teacher needs to pick 10 books to put on her reading list for the next school year and she needs to plan the order in which they should be read. She has narrowed down her choices to 4 novels 8 plays, 5 poetry books, and 5 nonfiction books. If

    asked on February 10, 2019
  49. Science

    How would you experiment to find out how much this plant type needs for optimal growth? I am not sure how to answer this question.

    asked on September 21, 2017
  50. math

    Hi, I was working on my math homework and I was stumbling on these problems. I wanted to double check my answers that I have; I also could not answer 5. If vectors O(0,0,0), A(6,0,0), B(6,-sqrt(24), sqrt(12)), and C(0,-sqrt(24), sqrt(12)) form a square. 1)

    asked on April 19, 2017
  51. Math 11

    write the equation in vertex form, of a parabola with vertex (5, -1) and that passes through the point (6, 8)

    asked on April 11, 2017
  52. Math

    Katie is baking cookies. She only wants to make 3/4 of the recipe. She needs to take 3/4 of the 2/3 cup of sugar. How much sugar does she need?

    asked on January 24, 2017
  53. Math

    How many 3/8 foot pieces of wood can you cut from a board that is 1 7/8 feet long?

    asked on August 22, 2016
  54. math

    sonya spent 3/8 of her money and had $15 left. how much money did she orginally start with?

    asked on March 29, 2016
  55. Algebra

    In 2009, a diabetic express company charged $39.95 for a vial of type A insulin and $30.34 for a vial of type B insulin. If a total of $2022.21 was collected for 60 vials of insulin, how many vials of each type were sold?

    asked on August 17, 2015
  56. statistics

    In a certain lottery, five different numbers between 1 and 31 inclusive are drawn. These are the winning numbers. To win the lottery, a person must select the correct 5 numbers in the same exact order in which they were drawn. What is the probability of

    asked on March 16, 2015
  57. Physics College

    What is the rate of deceleration of a 1400-kg SUV that is going 75.0 km/h and then slows to 25.0 km/h in 8.20 s?

    asked on September 30, 2014
  58. Physics Electricity and Magnetism

    A microscopic droplet of ink in an ink-jet printer is deflected onto the paper by a force of 2.34×10-4 N. If the field causing the deflection is 6.62 kN/C, what is the charge on the droplet? What equation do I use to solve and What does each value mean in

    asked on August 29, 2014
  59. Chemistry

    Consider the following reaction: CaCO3(s)→CaO(s)+CO2(g). Estimate ΔG∘ for this reaction at each of the following temperatures. (Assume that ΔH∘ and ΔS∘ do not change too much within the given temperature range.) A) 310K B) 1070K C) 1470K And is

    asked on May 14, 2014
  60. Science check answers please and quickly

    1. Jim is doing a physics experiment on the rate of cooling of solid objects in air. Which of the following is a variable that is not directly part of his experiment, but should be controlled in his experiment? (Points : 1) initial temperature to which he

    asked on January 8, 2014
  61. calcullus

    Suppose the quantity demanded per week of a certain dress is related to price by the demand equation p=√75-2x. In order to maximize revenue, how many dresses should be made and sold each week?

    asked on May 5, 2013
  62. Chem

    How many kilojoules of energy are needed to convert 104 g of ice at -14.6 to water at 25.8°C? (The specific heat of ice at -14.6 is 2.01 J/g°C.)

    asked on April 4, 2013
  63. Critical Points, Etc.

    find the values for a, b, and c such that the function f(x)= x^3 + ax^2 + bx+ c has a critical point at (1,5) and an inflection point at (2,3). a= -6 b= 3 c= 7 i got those, but they're wrong. i'm not sure why. :/

    asked on March 20, 2013
  64. Can someone Please Help

    You decide to establish a new temperature scale on which the melting point of ammonia (-77.75 C ) is 0 A, and the boiling point of ammonia (-33.35 C ) is 200 A What would be the temperature of absolute zero in A ?

    asked on February 4, 2013
  65. Chemistry

    You decide to establish a new temperature scale on which the melting point of ammonia (-77.75 C ) is 0 A, and the boiling point of ammonia (-33.35 C ) is 200 A. What would be the boiling point of water in A ? What would be the temperature of absolute zero

    asked on February 2, 2013
  66. Precalculus

    Prove or disprove cos(x+y)cos(x-y)=cos squared (x) - Sin squared (x) I dstributed the cosines and attempted to cancel out terms but I can't get the signs right. Any help on what I am missing?

    asked on November 14, 2012
  67. Physics

    A certain light truck can go around a flat curve having a radius of 150 m with a maximum speed of 29.0 m/s. With what maximum speed can it go around a curve having a radius of 88.0 m?

    asked on November 13, 2012
  68. phi 103

    "If that wasn't illegal, then it wouldn't be against the law" may commit which fallacy?

    asked on October 23, 2012
  69. Calculus L'Hopital Rule

    lim x->0 (x)sin(x)/1-cos(x). They both go to 0 so 0/0. now take L'H and product rule of top? lim x->0 (1)sin(x)+ cos(x)(x)/1-cos(x) what next? how do i solve from here?

    asked on October 18, 2012
  70. Chemistry

    Write the symbol and electron configuration for each ion and name the noble gas with the same configuration. a. nitride _________________________ b. oxide ___________________________ c. sulfide _________________________ d. bromide _________________________

    asked on October 9, 2012
  71. Precalculus/Trig 5

    Find the exact value of thet following trigonometric functions: tan(5pi/6) tan(7pi/6) tan(11pi/6)

    asked on October 8, 2012
  72. Precalculus/Trig 3

    The degree measure of an angle theta is 40 degrees. What is the radian Measure of theta? at what point P does the terminal ray intersect the unit circle (what is the ordered paid P(____, ___)?

    asked on October 8, 2012
  73. Precalculus SOH CAH

    how are the following relations true? S(theta + pi/2) = C(theta) and C(theta + pi/2) = -S(theta)?

    asked on September 22, 2012
  74. ALG 2 (exponents)

    Write log'2' 8 = 3 in exponential form?

    asked on May 12, 2012
  75. media and american culture

    Do you think the Internet has created more harm than good to artists in the music industry? Explain your answer.

    asked on December 1, 2011
  76. bca

    ____ is the code of acceptable behaviors users should follow while on the Internet; that is, it is the conduct expected of individuals while online.

    asked on March 1, 2011
  77. Physics

    A 10kg particle undergoes simple harmonic motion with an amplitude of 2.0mm, a maximum acceleration of 8.0x10^3 m/s^2, and an unknown phase constant (phi) What are: a.) the period of the motion b.) the maximum speed of the particle c.) total mechanical

    asked on November 30, 2010
  78. Physics

    A 10kg particle undergoes simple harmonic motion with an amplitude of 2.0mm, a maximum acceleration of 8.0x10^3 m/s^2, and an unknown phase constant (phi) What are: a.) the period of the motion b.) the maximum speed of the particle c.) total mechanical

    asked on November 30, 2010
  79. 11th grade

    Use the following functions to solve. f(x) = x2 + x + 1; g(x) = 5 - 2x; h(x) = -x2 Solve f(g(-1))

    asked on October 20, 2010
  80. physics

    In the diagram below, qA = 9.8 µC & qB = -1.4 µC. There is no charge at point C. The distance between A & C is 2.1 cm and the distance between B & C is 9.6 cm. Find the electric potential at point C

    asked on September 13, 2010
  81. English

    I need help with this. “What is Hamlet ‘about’?” and “What are its enduring themes and messages?”. The responses you provide do not have to be governed by the Values and Worldviews (Dialectic) approach. Substantiate your own ideas with evidence

    asked on November 29, 2009
  82. Statistics

    For df = 25, determine the value of A that corresponds to each of the following probabilites: a. P(t >- A)= 0.025 b. P(t

    asked on October 3, 2009
  83. Applied Math- Gr.11

    A farmer wants to enclose three sides of a rectangular pasture unsing 1000 yards of fencing. The fourth side does not require fencing because it borders a river. What dimensions (length and width) should the farmer choose in order to enclose the greatest

    asked on May 1, 2008
  84. pre-Algebra

    Write the following as a fraction and show your work. 0.83 (the three is repeating) I don't know how to do it with only one of the numbers repeating and it is not in my book.

    asked on December 11, 2007
  85. ECON-can anyone help

    CAN ANYONE PLEASE HELP// 1. In the Country of Wiknam, the velocity of money is constant. Real GDP grows by 5 percent per year, the money stock grows by 14 percent per year, and the nominal interest rate is 11 percent. What is the real interest rate? 2. The

    asked on October 22, 2007
  86. ECON-HELP!!

    1. In the Country of Wiknam, the velocity of money is constant. Real GDP grows by 5 percent per year, the money stock grows by 14 percent per year, and the nominal interest rate is 11 percent. What is the real interest rate? 2. The goverment raises taxes

    asked on October 21, 2007
  87. Science

    Why can humans not survive on Venus? Thank you for using the Jiskha Homework Help Forum. You will find 2 answers above under "Science." Since the volunteers do not sit here 24/7, a half hour is not long enough to wait for an answer.

    asked on June 4, 2007
  88. Precalc?

    Suppose that Cot(theta) = c and 0

    asked on January 23, 2013
  89. Chemistry

    Which of the following gases at STP would have the greatest volume? a] 1 mole of O ˇ2 b] 4 moles of He c] 0.2 moles of SO ˇ3 d] 5 moles of H ˇ2

    asked on March 30, 2020
  90. History

    Which of the following are the leading theories that describe how people first arrived in North America? Select the two correct answers. A. People may have walked over a land bridge from Asia. B. People may have traveled over by boat along the Pacific

    asked on October 24, 2019
  91. Math

    Find f. (Use C for the constant of the first antiderivative and D for the constant of the second antiderivative.) f ''(x) = 5/6x^5/6

    asked on October 6, 2019
  92. algebra

    A photograph is 4.5 in. wide and 6 in. long. A yearbook editor has the photo reduced to fit a space of 1.9 in wide. How long is the reduced photo?

    asked on September 12, 2019
  93. math

    Two less than the product of 16 and Greg's height

    asked on September 8, 2019
  94. science

    The light from the Sun heats a metal surface. This is an example of A. conduction. B. radiation. C. convection. D. reflection.

    asked on January 31, 2018
  95. math

    1.-3(n+5)=12 2.46=-6t-8

    asked on September 27, 2017
  96. Physics

    The density of the dead sea is 1.24x10^3 kg m^-3. A wooden board with an area of 2.5m^2 is dropped in the Dead Sea. Calculate the proportion that would float above the surface. Density of wood= 800kg m^-3

    asked on May 3, 2017
  97. math

    Hi I wanted to check my work for this problem. Consider the points A(1,0,0) B(2,2,2) and C(0,2,1). 1) Find the vector CA x CB I got -2i -3j +4k for this 2) Find an exact value for the area of the triangle ABC. I got sqrt29/2 for this. 3) Plane II(1) is

    asked on April 19, 2017
  98. Chemistry

    is the flame coloration a test for the metal or for the acid radical?

    asked on April 18, 2017
  99. vector calculus

    Hi, I'm having trouble answering this question. The lines l1 and l2 are defined as l1: (x-1)/3 = (y-5)/2 = (z-12)/-2 l2: (x-1)/8 = (y-5)/11 = (z-12)/6 The plane j contains both l1 and l2. Find the Cartesian equation of j.

    asked on April 18, 2017
  100. Math

    Henry needs to cut a 4 2/3 foot board into 5 equal pieces. How long was each piece?

    asked on January 24, 2017

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