Most popular questions and responses by Randy
  1. Physics

    Two horizontal forces, F1-> and F2-> , are acting on a box, but only F1->is shown in the drawing. F2-> can point either to the right or to the left. The box moves only along the x axis. There is no friction between the box and the surface. Suppose that

    asked on February 13, 2013
  2. Physics

    To move a large crate across a rough floor, you push on it with a force at an angle of 21 below the horizontal, as shown in the figure. Find the acceleration of the crate if the applied force is 400 , the mass of the crate is 32 and the coefficient of

    asked on March 6, 2011
  3. physics

    A jetliner can fly 5.57 hours on a full load of fuel. Without any wind it flies at a speed of 2.43 x 102 m/s. The plane is to make a round-trip by heading due west for a certain distance, turning around, and then heading due east for the return trip.

    asked on October 6, 2011
  4. Physics

    A space probe has two engines. Each generates the same amount of force when fired, and the directions of these forces can be independently adjusted. When the engines are fired simultaneously and each applies its force in the same direction, the probe,

    asked on February 13, 2013
  5. Chemistry

    A selenium atom (Se) would form its most stable ion by the 1. loss of 2 electrons. 2. gain of 1 electron. 3. loss of 1 electron. 4. loss of 7 electrons. 5. gain of 2 electrons. Help please and tell me how you got the answer. Thanks!

    asked on October 29, 2009
  6. Math

    sec 7pi/4 without a calculator Find the exact answer

    asked on November 7, 2014
  7. geometry

    The altitude of an equilateral triangle is 7 square root 3 units long. The length of one side of the triangle is ____ units. 7 14 14 square root 3 7 square root 3 over 2

    asked on January 17, 2012
  8. chemistry

    The conversion factor relating miles to meters is 1 mile= 1610m The speed of light is 3.00×10^8 m/s. How fast is this in miles per hour (miles/h \rm miles/h)?

    asked on September 8, 2013
  9. chemistry

    While in Europe, if you drive 105km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 22.0mi/gal? Assume that 1euro = 1.26 dollars.

    asked on September 8, 2013
  10. physics

    consider a pair of planets that find the distance between them is decreased by a factoer of 5. Show that the force between them becomes 25 times as strong?

    asked on November 14, 2008
  11. Algebra II

    if y varies directly as x, if y=80 when x=32, find x if y=100

    asked on March 22, 2012
  12. Chemistry

    What is the percent by mass of C in methyl acetate (C3H6O2)? The molecular weight of carbon is 12.0107 g/mol, of hydrogen 1.00794 g/mol, and of oxygen 15.9994 g/mol. Answer in units of %. Please work it out for me so I totally understand it. Thanks!

    asked on December 6, 2009
  13. Chemistry

    Help with lab report Need Help finishing my lab report.KNOWN VALUES ARE V OF HCL=50ML,M=2.188.V OF NAOH=55.3ML,M=2.088.INTIAL TEMP FOR HCL=22.5C,NAOH IS 23C.this is for part A: Mass of final NACL solution assuming that the density of a 1 M Nacl solution is

    asked on October 26, 2012
  14. chemistry

    Isotonic saline is 0.89% NaCl (w/v). Suppose you wanted to make 1.0 L of isotonic solution of NH4Cl. What mass of NH4Cl would you need? Question 23 options: 1.6 g 8.1 g 8.9 g 54 g

    asked on October 30, 2014
  15. Pre-Calculous (Trig)

    The Singapore Flyer, currently the world's largest Ferris wheel, completes one rotation every 37 minutes.1 Measuring 150 m in diameter, the Flyer is set atop a terminal building, with a total height of 165 m from the ground to the top of the wheel. When

    asked on October 17, 2014
  16. PHYSICS! -need help!-

    A potter is shaping a bowl on a a potter’s wheel. The wheel rotaes at a constant angular speed. The frictional force between her hands and the clay is 2.50 N. How large is the torque she produces on the wheel if the diameter of the bowl is 14 cm.

    asked on December 5, 2017
  17. Maths

    Determine the effective annual yield (annual percentage yield) for $1 invested for 1 year at 8.5% compounded monthly.

    asked on March 19, 2008
  18. physics

    A log is floating on swiftly moving water. A stone is dropped from rest from a 84-m-high bridge and lands on the log as it passes under the bridge. If the log moves with a constant speed of 3.6 m/s, what is the horizontal distance between the log and the

    asked on September 8, 2010
  19. Statistics/Probability

    So I tried solving the first one and apparently failed miserably, attempted both twice and got it wrong each time and I have one submission attempt left, so any help is definitely appreciated! 1. Hotels R Us has kept the following recordes concerning the

    asked on May 21, 2014
  20. Physics

    A small lead ball, attached to a 1.50-m rope, is being whirled in a circle that lies in the vertical plane. The ball is whirled at a constant rate of three revolutions per second and is released on the upward part of the circular motion when it is 0.75 m

    asked on February 26, 2013
  21. geometry

    Ray OX bisects angle AOC and angle AOX =42 degrees, angle AOC is: 42 degrees 84 degrees 21 degrees 68 degrees

    asked on January 17, 2012
  22. math

    What is (f+g)(x)? f(x)=x^2−36 g(x)=x^3+2x^2−10

    asked on April 9, 2018
  23. math

    The function ​f(x)​ is the number of feet below the surface of the water a diver is at x seconds. After 14 s, the diver reached the maximum distance of 22 ft below the surface of the water. The diver stayed in the water for 20 minutes. What is the

    asked on April 9, 2018

    What are the odds in favor of drawing face card from an ordinary deck of cards? to

    asked on May 23, 2012
  25. Physics

    At an amusement park, a swimmer uses a water slide to enter the main pool. If the swimmer starts at rest, slides without friction, and descends through a vertical height of 2.41 m, what is her speed at the bottom of the slide?

    asked on March 22, 2011
  26. statistics

    Assume that about 45% of all U.S. adults try to pad their insurance claims. Suppose that you are the director of an insurance adjustment office. Your office has just received 110 insurance claims to be processed in the next few days. What is the

    asked on September 26, 2010
  27. PHYSICS! -need help!-

    A child pushes tangentially on a small hand driven merry- go- round. She is able to accelerate it from rest to 20 rpm in 10 s. Modeling the merry go round as a uniform disk of radius 3.5 m and mass 800 kg, find the torque required to produce that

    asked on December 5, 2017
  28. math

    order the numbers from least to greatest. _ 1 4/5, 1.78, 1 5/6, 7/4, 1.7, 1 8/11 I am confused on going back and forth between decimals and fractions.

    asked on September 11, 2014
  29. physics

    Driving in your car with a constant speed of 12 m/s, you encounter a bump in the road that has a circular cross-section. If the radius of curvature of the bump is 35 m, find the apparent weight of a 63-kg person in your car as you pass over the top of the

    asked on March 6, 2011
  30. Math

    please help how would i find the unit rate of $112 in 8 Hrs

    asked on January 9, 2008
  31. PHYSICS! -need help!-

    A gymnast with a mass of 52 kg stands on the end of a uniform balance beam as shown in the figure. The beam is 5.50 m long and has a mass of 250 kg. Each support is 0.54m from the end of the beam. What is the force on the beam due to support 2?

    asked on December 5, 2017
  32. Chemistry

    What volume of carbon monoxide gas (at STP) is needed when 1.35 Moles of oxygen gas react completely in the following equation. 2CO + O2 > 2CO2 please show your work I'm having trouble with Gas Stoichiometry.

    asked on April 16, 2012
  33. Algebra

    I am so lost on these problems. Write a geometric sequence that starts with 3 and has a common ratio of 5. What is the 23rd term in the sequence. Write an arithmetic sequence that has a common difference of 4 and the eighth term is 13. What is the first

    asked on June 17, 2016
  34. chemistry

    The solubility of Na3(PO4) is 0.025 M. What is the Ksp of sodium phosphate?

    asked on November 11, 2015
  35. physics

    A ball is thrown straight upward and returns to the thrower's hand after 2.75 s in the air. A second ball thrown at an angle of 34.0° with the horizontal reaches the same maximum height as the first ball. (a) At what speed was the first ball thrown? ____

    asked on June 5, 2018
  36. math

    the absolute value of an integer is always greater than the integer. True or False?

    asked on January 27, 2012
  37. chemistry

    How many moles of Cu are needed to react with 3.50 moles of AgNO3?

    asked on October 30, 2010
  38. chemistry

    A sprinter set a high school record in track and field, running 200.0 m in 20.9s . What is the average speed of the sprinter in kilometers per hour

    asked on September 8, 2013
  39. physics

    Show that for 1 kg of pure gold the volume of water displaced is 51.8 cm^3 I know that the density of pure gold is 19.32 gm/cm^3 so 1 kg/19.32 gm/cm^3= 0.05175 ? I have come along way with this problem and feel like I am close, but now I need help. How do

    asked on November 21, 2008
  40. MicroEconomics (please help)

    Can someone please help me with the following questions? thanks a lot 1. The cranberry market is perfectly competitive. Reports that consuming cranberries can lead to improved health result in a permanent increase in the demand for cranberries and an

    asked on December 10, 2006
  41. Math Trig

    A kite flier wondered how high her kite was flying. She used a protractor to measure an angle of 40 degrees from level ground to the kite string. If she used a full 120-yard spool of string, how high, in feet, was the kite? (Disregard the string sag and

    asked on October 24, 2014
  42. physics

    Meteorites from Mars Several meteorites found in Antarctica are believed to have come from Mars, including the famous ALH84001 meteorite that some believe contains fossils of ancient life on Mars. Meteorites from Mars are thought to get to Earth by being

    asked on April 28, 2011
  43. Physics! NEED HELP!

    A 40 kg girl runs up a flight of stairs that is 34 m high. How much work does this require?

    asked on October 19, 2017
  44. physics

    A golfer hits a shot to a green that is elevated 3.0 m above the point where the ball is struck. The ball leaves the club at a speed of 16.8 m/s at an angle of 30.0¢ª above the horizontal. It rises to its maximum height and then falls down to the green.

    asked on October 6, 2011
  45. Physics! Need help!

    A 60 kg block slides along the top of a 100 kg block. The lighter block has an acceleration of 3.4 m/s2 when a horizontal force F= 370 N is applied. Assuming there is no friction between the bottom 100 kg block and the horizontal frictionless surface but

    asked on October 8, 2017
  46. math

    Which characteristic is correct for the function f(x)=−2x3+3x ? neither even nor odd even both even and odd odd

    asked on April 9, 2018
  47. Trig / Calc

    What angle (in degrees) corresponds to 18.96 rotations around the unit circle? Enter the exact decimal answer.

    asked on October 23, 2014
  48. chemistry

    the heat of fusion water is335 J/g. The heat of evaporization of water is 2.26 kJ/g, the specific heat of ice is 2.05 J/Deg/g, the specific heat of steam is 2.08 J/deg/g and the specific heat of liquid water is 4.184 J/deg/g. How much heat would be needed

    asked on April 24, 2012
  49. Physics!

    A 40 kg girl runs up a flight of stairs that is 34 m high. How much work does this require?

    asked on October 19, 2017
  50. Math

    True or false and if false write a true statement 1. A right triangle has three right angles. 2. A triangle that has three sides of the same length is an equilateral triangle. 3. An obtuse triangle has two angles that are acute. 4. In a right triangle the

    asked on January 24, 2015
  51. math

    a car weighing 15000N rounds a curve of 60m. radius banked at angle of 30 degrees.find the frictional force acting on the tires when the car is travelling at 100kph.The coefficient of friction between the tires and the road is 0.90.

    asked on February 23, 2013
  52. physics

    The angular speed of a rotor in a centrifuge increases from 428 to 1400 rad/s in a time of 6.26 s. (a) Obtain the angle through which the rotor turns. (b) What is the magnitude of the angular acceleration?

    asked on July 7, 2015
  53. Math

    1) what is the length of the diagonal of a square whose sides are 3 inches long. A. 9 inches B. 3 square root 2 inches**** C. 6 inches D. 18 inches 2) which set of measure could be the side lengths of a right triangle? A. 0.9 cm, 1.2 cm, 1.5 cm B. 4 in, 4

    asked on December 6, 2012
  54. Statistics

    A box contains five numbered balls (1,2,2,3 and 4). We will randomly select two balls from the box (without replacement). (a) The outcome of interest is the number on each of the two balls we select. List the complete sample space of outcomes. (b) What is

    asked on March 12, 2013
  55. Science

    Nathaniel is driving his sports car down a four lane highway at 40m/s. He comes up behind a slow moving dumptruck and decides to pass it in the left hand lane. If Nathaniel can accelerate at 5m/s^2, how long will it take for him to reach the speed of

    asked on January 14, 2013
  56. Word Problem

    Assume that the mathematical model C(x) = 16x + 130 represents the cost C, in hundreds of dollars, for a certain manufacturer to produce x items. How many items x can be manufactured while keeping costs between $525,000 and $781,000? Thanks in advance!

    asked on February 18, 2009
  57. math

    Ray OX bisects angle AOC and angle AOX =42 degrees, angle AOC is: 42 degrees 84 degrees 21 degrees 68 degrees

    asked on January 16, 2012
  58. physics

    a boy of mass 40kg and a girl of 30kg play on a see saw of negligible weight.if the boy sits 270cm from the pivot of the see-saw where must the girl sit to make it balance

    asked on February 8, 2015
  59. Physics

    A rocket blasts off from rest and attains a speed of 30.4 m/s in 10.3 s. An astronaut has a mass of 60.1 kg. What is the astronaut's apparent weight during takeoff?

    asked on February 13, 2013
  60. Statistics

    *Give all probabilities to two decimal places. Three daily newspapers are published in a large city. Suppose we have the following facts about the people in the city: 60% read Newspaper A. 34% read Newspaper C. 72% read Newspaper A or Newspaper B. 18% read

    asked on March 12, 2013
  61. math

    1. find the lateral area of a right prism whose altitude measures 20 cm and whose base is a square with a width 7 cm long. 2. the volume of a rectangular solid is 5376 cubic meters, and the base is 24 meters by 16 meters. find the height of the solid. 3. a

    asked on January 7, 2012
  62. physics

    A bat at rest sends out ultrasonic sound waves at 51.1 and receives them returned from an object moving directly away from it at 22.3 .

    asked on November 16, 2011
  63. math

    How many thousands of people live in Boston ma.if population is 617,594

    asked on September 17, 2014
  64. Physics

    A bicyclist rides 2.78 km due east, while the resistive force from the air has a magnitude of 6.52 N and points due west. The rider then turns around and rides 2.78 km due west, back to her starting point. The resistive force from the air on the return

    asked on February 26, 2013
  65. Statistics

    How do frequency tables, relative frequencies, and histograms showing relative frequencies help us understand sampling distributions? A. They help us to measure or estimate of the likelihood of a certain statistic falling within the class bounds. B. They

    asked on September 26, 2010
  66. geometry

    The altitude of an equilateral triangle is 7 square root 3 units long. The length of one side of the triangle is ____ units. 7 14 14 square root 3 7 square root 3 over 2

    asked on January 16, 2012
  67. Biology

    the biome with the fewest seasonal changes is?

    asked on October 29, 2011
  68. physics

    if two carts, one twice as massive as the other, fly apart when a compressed spring that joins them is released. How fast does the heavier cart roll compared to the lighter cart?

    asked on November 14, 2008
  69. 3rd grade

    The number with the most digits is always greatest. Do you agree? Explain. Explain how you use a hundred chart to subtract 12 from 46.

    asked on September 18, 2008
  70. chemistry

    the heat of fusion of water is 335 J/g. How much heat would be required to melt 97.8 g of ice

    asked on April 24, 2012
  71. Physics

    When you push a 1.82-kg book resting on a tabletop, it takes 2.30 N to start the book sliding. Once it is sliding, however, it takes only 1.46 N to keep the book moving with constant speed. Q1. What is the coefficient of static friction between the book

    asked on March 7, 2011
  72. chemistry

    Suppose that the microwave radiation has a wavelength of 10.8 cm. How many photons are required to heat 225 mL of coffee from 25.0*C to 62.0*C ? Assume that the coffee has the same density, 0.997 g/mL , and specific heat capacity, 4.184 J/(gK), as water

    asked on October 25, 2010
  73. English

    Which of the following is unimportant for an introduction in formal or academic writing? 1.Entertaining the audience. 2.Establishing the key point the piece of writing will make 3.Discussing your opinion on the topic for at least three sentences.

    asked on April 25, 2016
  74. ECON 4346

    4-The three fundamental economic questions of what, how, and for whom: a-exist because of scarcity. b-are much more serious in a socialist system. c-are not serious in a capitalistic system. d-are not relevant in the industrialized world of today. 5-When

    asked on September 19, 2012
  75. chemistry

    the heat of vaporization of water is 2.26kJ/g. how much heat is needed to change 2.55 g of water to steam?

    asked on April 20, 2012

    Select all statements that are true. (log_b\(A\))/(log_b\(B\))=log_b\(A-B\) (If ) log_1.5\(8\)=x, text( then ) x**(1.5) =8. log\(500\) text( is the exponent on ) 10 text( that gives ) 500. text (In )log_b\(N\), text( the exponent is )N. text( If )

    asked on April 16, 2012
  77. math - integers

    4. The temperature is falling 3 degrees per hour. How many degrees has it fallen altogether from 12 noon to 12 midnight?

    asked on February 7, 2012
  78. -!!Physics!!- Really need help with this!

    Three carts are moving on a frictionless horizontal track as shown in the figure. The 4.00 kg cart is moving to the right with a speed of 7.0 m/s, the 10.0 kg cart is also moving to the right with a speed of 6.0 m/s while the 3.00 kg cart moves to the left

    asked on November 3, 2017
  79. math

    If pump A and pump B work together, they can fill a pool in 4 hours. Pump A, working alone, takes 6 hours to fill the pool. How long would it take pump B, working alone, to fill the pool?

    asked on January 31, 2013

    The product of two consecutive positive even numbers is 528. What are the numbers? (Enter solutions from smallest to largest.) and

    asked on April 25, 2012
  81. physics

    An automobile starts from rest and accelerates to a final velocity in two stages along a straight road. Each stage occupies the same amount of time. In stage 1, the magnitude of the car's acceleration is 2.03 m/s2. The magnitude of the car's velocity at

    asked on October 3, 2011
  82. Chemistry

    If 5.27 mol of ethane (C2H6) undergo combus-tion according to the unbalanced equation C2H6 + O2 −! CO2 + H2O, how much oxygen is required? Answer in units of mol. Thanks!

    asked on January 18, 2010
  83. physics

    Object A, which has mass m and a velocity Voi,collides with the Object B,which has mass 2m and a velocity 1/2Voj.Following the collision ,object B has a velocity of 1/4Voi.(a) Determine the velocity of object A after the collision.(b) Is the collision

    asked on October 29, 2009
  84. chemistry

    Question:A solution of AgNO3 (45 mL/0.45 M) was mixed with solution of NaCl (85 mL/1.35 x 10-2 M) a) Calculate the ion product of the potential precipitate. My answer: mol AgNO3 = M x L = 0.45 M x 0.045 M = 0.02025 mol NaCl = M x L = 0.0135 M x 0.085 L =

    asked on April 18, 2008
  85. physics

    consider a massless cord attached at both ends to hooks in a ceiling. A 20 kg mass is then suspended from the first cord by a second cors. The angles made by the cord with the ceiling are 40 degrees (left angle) and 25 degrees (right angle). Find the

    asked on November 20, 2006
  86. physics!

    A taut massless string connects two boxes as shown in the figure. The boxes are placed on an incline plane at θ = 31.00. What is the acceleration of boxes as they move down the incline, given m2 = 1.6 kg, m1 = 7.6 kg, μ2 = 0.10 and μ1 = 0.20. Please

    asked on October 7, 2017
  87. calculus

    When an oil well burns, sediment is carried up into the air by the flames and is eventually deposited on the ground. Less sediment is deposited further away from the well. Experimental evidence indicates that the density (in tons per square mile) at a

    asked on February 19, 2015
  88. Physics

    The drawing shows a skateboarder moving at 5.40 m/s along a horizontal section of a track that is slanted upward by 48.9 ° above the horizontal at its end, which is 0.582 m above the ground. When she leaves the track, she follows the characteristic path

    asked on February 26, 2013
  89. Physics

    At an instant when a soccer ball is in contact with the foot of the player kicking it, the horizontal or x component of the ball's acceleration is 940 m/s2 and the vertical or y component of its acceleration is 710 m/s2. The ball's mass is 0.35 kg. What is

    asked on February 13, 2013
  90. Chemistry

    A 27.4 g sample of metal X requires 131 calories of energy to heat it from 10.0◦C to 90.0◦C. Calculate the specific heat of metal X. Answer in units of J/g ·◦ C. Any help would be greatly appreciated

    asked on October 11, 2009
  91. PHYSICS! -need help!-

    A combination of an applied force and a frictional force produce a constant total torque of 38 N-m on a wheel rotating about a fixed axis. This combined force acts for 8 s, during which the wheel’s angular speed increases from 0 to 12 rad/s. Find the

    asked on December 5, 2017

    Let U = {17, 18, 19, 20, 21, 22, 23}, B = {17, 20, 21, 23}, and C = {19, 20, 22, 23}. List all the members of the sets. (Enter solutions from smallest to largest. If there are any unused answer boxes, enter NONE in the last boxes.) B = C =

    asked on May 6, 2012
  93. physics

    A ball is thrown upward at a speed v0 at an angle of 59.0¢ª above the horizontal. It reaches a maximum height of 8.7 m. How high would this ball go if it were thrown straight upward at speed v0?

    asked on October 6, 2011
  94. physics

    Find the minimum kinetic energy needed for a 3.7×104-kg rocket to escape the Moon.

    asked on April 28, 2011
  95. physics

    When you take your 1000-kg car out for a spin, you go around a corner of radius 57 m with a speed of 11 m/s. The coefficient of static friction between the car and the road is 0.88. Assuming your car doesn't skid, what is the force exerted on it by static

    asked on March 6, 2011
  96. statistics

    A USU today survey found that of the gun owners surveyed 275 favor stricter gun laws. Test the claim that the majority (more than 50%) of gun owners favor stricter gun laws. Use a .05 significance level.

    asked on December 7, 2010
  97. physics

    A force is given by Fx=Ax^-3, where A=8.0 N*m^3.(a) For positive values of x,does the potential energy associated with this force increase or decrease with increasing x?(You can determine the answer to this question by imagining what happens to a particle

    asked on October 28, 2009
  98. physics

    A force of 30 N pulls a mass left at 30 degrees to the horizontal and one of 100 N pulls right at 120 degrees. If the mass of the mass which is 50 kg, find the acceletation if coeffcient of sliding is .01? What would be the equation of this problem? If you

    asked on November 20, 2006
  99. Physics

    The concepts in this problem are similar to those in Multiple-Concept Example 4, except that the force doing the work in this problem is the tension in the cable. A rescue helicopter lifts a 72.4-kg person straight up by means of a cable. The person has an

    asked on February 26, 2013
  100. Physics

    The sun is more massive than the moon, but the sun is farther from the earth. Which one exerts a greater gravitational force on a person standing on the earth? Give your answer by determining the ratio Fsun/Fmoon of the magnitudes of the gravitational

    asked on February 13, 2013


  1. 1
  2. 2
  3. 3
  4. 4