Phil

Most popular questions and responses by Phil
  1. Physics

    Figure (a) shows charged particles 1 and 2 that are fixed in place on an x axis. Particle 1 has a charge with a magnitude of |q1| = 12.0e. Particle 3 of charge q3 = +13.0e is initially on the x axis near particle 2. Then particle 3 is gradually moved in

    asked on January 20, 2012
  2. Physics

    A guitar string is 90cm long and has a mass of 3.8g . The distance from the bridge to the support post is L=62cm , and the string is under a tension of 540N . What are the frequencies of the fundamental and first two overtones?

    asked on January 25, 2013
  3. Chemistry

    What is the effect on the boiling point of a solution (for example, water) produced by a soluble nonvolatile substance (for example, sodium chloride)? What is the effect of an insoluble substance such as sand or charcoal? I believe if an insoluble

    asked on November 10, 2008
  4. Physics- PLEASE HELP

    Two boxes of fruit on a frictionless horizontal surface are connected by a light string as in the figures below, where m1 = 15 kg and m2 = 17 kg. A force of 58 N is applied to the 17 kg box. Repeat the problem for the case where the coefficient of kinetic

    asked on October 3, 2012
  5. Physics

    The coefficient of kinetic friction for a 22 kg bobsled on a track is 0.15. What force is required to push it down a 6.0° incline and achieve a speed of 64 km/h at the end of 75 m?

    asked on October 2, 2011
  6. Physics

    A brass plug is to be placed in a ring made of iron. At 20 degrees Celsius, the diameter of the plug is 8.737 cm and that of the inside of the ring is 8.723 cm. They must both be brought to what common temperature in order to fit? (ANSWER: -210 degrees

    asked on November 16, 2010
  7. Chemistry

    Why isn't hydrochloric acid used to both dissolve and precipitate silver?

    asked on September 11, 2008
  8. chemistry

    Standard Addition Question: Serum containing Na+ gave a signal of 4.27 mV in an atomic emission analysis. Then 5.00 mL of 2.08 M NaCl were added to 95.0 mL of serum. This spiked serum gave a signal of 7.98 mV. Find the original concentration of Na+ in the

    asked on August 9, 2015
  9. Physics

    Figure (a) shows charged particles 1 and 2 that are fixed in place on an x axis. Particle 1 has a charge with a magnitude of |q1| = 12.0e. Particle 3 of charge q3 = +13.0e is initially on the x axis near particle 2. Then particle 3 is gradually moved in

    asked on January 20, 2012
  10. CHemistry

    im not sure how u solve these types of problems... How many moles of NaOH are contained in 200ml of a 0.1M of NaOH? How many grams of NaOH are contained in 500ml of a .5M solution of NaOH? A 0.1 M solution has 0.1 moles of the solute NaOH per liter. You

    asked on April 21, 2007
  11. Physics

    1.) Describe the proper way to use a meter stick and why this technique is necessary (include an explanation of uncertainty). 2.) What is the difference between percent error and standard error?

    asked on September 8, 2010
  12. Physics

    A 1100 kg car is moving toward the north along a straight road at a speed of 20.0 m/s. The driver applies the brakes and the car comes to rest in a distance of 140 m. (a) If the road is completely level, what is the constant force applied to the car to

    asked on September 16, 2010
  13. Science URGENT help please

    Piano movers hoist a 200 kg piano 10 m high in 30 s using a rope and simple pulley. What is their power output? (Points : 1) 70 W 700 W 7,000 W 6 × 10^5 W

    asked on April 16, 2014
  14. Chemstry

    What is the structure of N4O, where the 3 nitrogen bonds have different bond lengths and the N=O bond is a double bond. I just don't get it

    asked on November 9, 2010
  15. MATH EMERGENCY

    The demand function for a certain brand of CD is given by p = −0.01x^2 − 0.2x + 12 where p is the unit price in dollars and x is the quantity demanded each week, measured in units of a thousand. The supply function is given by p = 0.01x^2 + 0.7x + 1

    asked on December 3, 2014
  16. History

    How did the geographic location of Philadelphia affect the city's development? Because of its location on rivers, the city built bridges and used ferries to allow workers to access the city. Because of proximity to water, streets had to be properly

    asked on April 25, 2017
  17. Physics

    A child on a sled reaches the bottom of a hill with a velocity of 12.0 m/s and travels 22.0 m along a horizontal straightaway to a stop. If the child and sled together have a mass of 59.0 kg, what is the magnitude of the average retarding force on the sled

    asked on September 14, 2010
  18. MICROBIOLOGY

    WHICH IS A RNA MOLECULE AGCCTAC GGGCCCA GCCCUUA

    asked on October 3, 2009
  19. Chemistry

    How do you prepare one liter of phosphate buffer 0.01 M at pH 12.0 from 85% phosphoric acid (density 1.69g/ml) and NaOH 1.0 M

    asked on April 7, 2016
  20. Physics

    A 1100 kg car is moving toward the north along a straight road at a speed of 20.0 m/s. The driver applies the brakes and the car comes to rest in a distance of 140 m. (a) If the road is completely level, what is the constant force applied to the car to

    asked on September 16, 2010
  21. Physics

    A sprinter starts from rest in a 100-meter race, accelerates to his full running speed of 10.3 m/s in 1.15 seconds (assume constant acceleration) and continues at that speed for the rest of the race. (a) How far did he run before attaining his full speed?

    asked on September 16, 2010
  22. physics

    A dike in Holland springs a leak through a hole of area 0.60cm 2 cm^2 at a depth of 1.4m m below the water surface. How much force must a boy apply to the hole with his thumb to stop the leak? Express your answer to two significant figures and include the

    asked on April 3, 2014
  23. homework

    every yellow marble is expensive.one -half the orange marbles are expensive.one -half of all expensive marbles are yellow. there are 40 yellow marbles and 25 expensive marbles that are niether yellow nor orange. how many orange marbles are there?

    asked on October 30, 2011
  24. chemistry

    A researcher found that 11.56 g of lead sulfide, PbS, were formed when each of the following occurred: 10.0 g of lead reacted with 1.56 g of sulfur 10.0 g of lead reacted with 3.00 g of sulfur 18.0 g of lead reacted with 1.56 g of sulfur Explain these

    asked on March 12, 2009
  25. Physics

    A boy sits in a tire that is attached to a rope that passes over a pulley fastened to the ceiling and then passes back down to the boy's hands. The weight of the boy plus the tire is W. The force with which the boy must pull on the free end of the rope to

    asked on January 9, 2010
  26. algebra

    using formula d(h)=8e^-0.4h to determine the milligrams d of a certain drug in bloodstream h hours after given.how many milligrams will be present after 6 hours?

    asked on July 17, 2013
  27. physics

    A wooden box weighing 271 N is pushed across the floor by a workman who exerts a horizontal force of 144 N. If the force of friction between the box and the floor is 28 N, what is the acceleration (in meters/second^2) of the box?

    asked on March 7, 2012
  28. Physics

    Estimate the average force exerted by a shot-putter on a 6.5 kg shot if the shot is moved through a distance of 2.7 m and is released with a speed of 11 m/s.

    asked on September 14, 2010
  29. math

    How much interest will I owe if I put $10000 on my credit card, with 12% interest, and not pay anything for 4 months?

    asked on September 4, 2019
  30. physics

    solid sphere of uniform density starts from rest and rolls without slipping down an inclined plane with angle è = 30o. The sphere has mass M = 8 kg and radius R = 0.19 m . The coefficient of static friction between the sphere and the plane is ì = 0.64.

    asked on March 31, 2013
  31. Physics

    This question has me very lost. Two loudspeakers emit sound waves along the x-axis. The sound has maximum intensity when the speakers are 11 cm apart. The sound intensity decreases as the distance between the speakers is increased, reaching zero at a

    asked on November 29, 2008
  32. Physics

    Estimate the work you do to mow a lawn 14m by 23m with a 0.5m-wide mower. Assume you push with a force of about 15N.

    asked on September 29, 2010
  33. statistics

    In a class of 100 students, 30 are computer science majors, 49 are mechaincal engineering majors, 13 are civil engineers and the rest are general engineering majors. Assume students only have one major. If a student is chosen at random what is the

    asked on January 16, 2015
  34. ALGEBRA

    7300 @ 7% COMPOUNDED SEMIANNUALLY FOR 3 YRS

    asked on May 18, 2013
  35. Physics

    A small object of mass 2.60 g and charge -17 µC "floats" in a uniform electric field. What is the magnitude and direction of the electric field?

    asked on February 17, 2013
  36. physics

    A bicycle wheel of radius 0.4 m is spinning at a rate of 40 revolutions per minute. What is the centripetal acceleration of a point on the edge of the wheel? What is the period of the wheel's motion?

    asked on September 28, 2012
  37. physics

    Determine the stopping distances for a car with an initial speed of 93 km/h and human reaction time of 3.0 s for the following accelerations: -4.00 m/s^2 -8.00 m/s^2

    asked on August 19, 2011
  38. social studies

    hi can someone please help me with these 3 questions. 1. One manifestation of the rising democratic tide in the 1830s was a. a general raising of the political tone b. use of national nominating conventions I think it's a but i don't know why it can't be B

    asked on November 9, 2008
  39. Calculus

    Consider the curve C parametrized by (x, y) = (cos (5t), sin(−4t)), for −π ≤ t ≤ 2pi How would I go about finding how many times the curve is traversed? Also, how would I find out the radius and center of the circle is? I don't need answers I just

    asked on September 9, 2019
  40. Physics

    A vibration platform oscillates up and down with an amplitude of 10.2 cm at a controlled variable frequency. Suppose a small rock of unknown mass is placed on the platform. At what frequency will the rock just begin to leave the surface so that it starts

    asked on February 19, 2012
  41. MICROBIOLOGY

    WHICH IS /ARE COMPLEMENTARY TO 5' AGGCUAAC 3' 1. 5'TCCGATTG3' 2. 3'TCCGATTC5' 3. 5'CTTAGCCT3' 4.3'TAAGCTTA5' 5. 3'TCCGATTG5' AND 5'GTTAGCCT3'

    asked on October 3, 2009
  42. math

    Sue has a total of $4000 to invest in two accounts. one account earns 2% simple interest and the other earns 5% simple interest. How much should be invested in both accounts to earn exactly $155 at the end of the year?

    asked on October 3, 2014
  43. algebra

    A plane takes 3 hours to travel 1500 miles with the wind. it can travel only 1380 miles against the wind in the same amount of time. Find the speed of the wind and the speed of the plane in still air.

    asked on October 3, 2014
  44. Physics 121

    Two block are connected by a rope that runs over a pulley. The block on the tables has mass 4kg, the hanging block has mass 2kg, and the pulley has mass 0.5kg and radius 0.25m. Assume that the table is friction-less. If the block are released from the

    asked on May 5, 2012
  45. Physics

    A 13 cm long animal tendon was found to stretch 3.8 mm by a force of 13 N. The tendon was approximately round with an average diameter of 9.0 mm. Calculate the elastic modulus of this tendon.

    asked on October 28, 2010
  46. Physics

    Estimate the work you do to mow a lawn 14m by 23m with a 0.5m-wide mower. Assume you push with a force of about 15N.

    asked on September 28, 2010
  47. Physics

    A car is initially travelling at 30m/s, which is above the speed limit. The driver sees a speed limit trap ahead and applies the brakes for 5 seconds, causing the car to slow down by 2m/s every second while the brakes are on. How far does the car travel

    asked on November 4, 2015
  48. English

    Mr. Smith, my Spanish teacher, is going on vacation. is this correct PUNCTUATION AND GRAMMER

    asked on December 31, 2012
  49. Physics

    h t t p : / / b i t . l y / 9 S F F F o a) What is the minimum value of F needed to move the two blocks? b) If the force is 10% greater than your answer for (a), what is the acceleration of each block?

    asked on September 19, 2010
  50. bio

    On the archipelago of the Galapagos Islands, which most geologists believe to be of volcanic origin without ever having had any land connection with the west coast of South America, Darwin discovered a group of small finches. These birds have since been

    asked on January 12, 2009
  51. accounting

    Your rich godfather has offered you a choice of one of the three following alternatives: $10,000 now; $2,000 a year for eight years; or $24,000 at the end of eight years. Assuming you could earn 11 percent annually, which alternative should you choose? If

    asked on January 10, 2010
  52. physics

    show that for a pendulum to oscillate at the same frequency as an object on a spring, the pendulum's length must be L=mg/k thank you

    asked on January 21, 2009
  53. Precalculus

    The graph of the parametric equations x=cos(t), y=sin(t) meets the graph of the parametric equations x=2+4cos(s), y=3+4sin(s), at two points. Find the slope of the line between these two points.

    asked on April 9, 2016
  54. Physics

    Two electrons are fixed 2.99 cm apart. Another electron is shot from infinity and stops midway between the two. What is its initial speed?

    asked on February 9, 2012
  55. chemistry

    How many Ca +2 ions in 40.08g of CaCO3 (Calcium Carbonate) I'm unsure on how to approach this problem and set it up.

    asked on January 21, 2010
  56. physics

    In the sketch, the small hydraulic piston has a diameter of 2.5cm cm . The large piston has a diameter of 6.4cm cm . For each newton of force applied to the small piston, how many newtons of force are exerted by the large piston? Express your answer using

    asked on April 3, 2014
  57. Math

    From a point P on the ground which is 100m from the foot of a church tower, the angle if elevation of the top of the tower is 50 degrees calculate the height of the tower...

    asked on September 21, 2016
  58. Physics

    HELP! A tennis ball is attached to a .8m long string whirled around in a circle with a constant frequency of 1.2 Hz. What is the linear(tangential) velocity of the tennis ball?

    asked on March 12, 2012
  59. History

    How did John Adams help establish a stable government after the constitution? Like I know he almost put us in the Quasi-War and threatened civil rights with the Alien & Sedition Acts, but how did he HELP establish a stable gov't?

    asked on October 19, 2008
  60. Physics - Buoyancy

    A scale reads 20.3 N when an object is not submerged in water and 20.0 N when the object is (completely) submerged in water. What is the specific gravity of the object?

    asked on November 11, 2010
  61. bio essay

    Hi. I need more help with this question. On the archipelago of the Galapagos Islands, which most geologists believe to be of volcanic origin without ever having had any land connection with the west coast of South America, Darwin discovered a group of

    asked on January 12, 2009
  62. Physics

    A cylindrical diving bell 5 m in diameter and 10 m tall with an open bottom is submerged to a depth of 150 m in the ocean. The temperature of the air at the surface is 20 degrees Celsius, and the air temp 150 m down is 2 degrees Celsius. The density of

    asked on January 8, 2009
  63. Chemistry

    i was wondering which ones are soluble in water and what ones are not: K2CrO4, CaS, Na2S, and BaSO4 I was also wondering if AgBr and CaCO3 are soluble as well. BaSO4, AgBr and CaCO3 are insoluble. The others are soluble. I can give you a web site that

    asked on April 19, 2007
  64. Physics

    You have a neutral balloon. What is its charge after 12000 electrons have been removed from it? The elemental charge is 1.6 × 10−19 C. Answer in units of μC

    asked on February 6, 2018
  65. Chemistry

    Calculate the heat released from 61.5 g of steam at 111 degrees C is converted to water at 39 degrees C. Assume the specific heat of water is 4.184 J/g*C, the specific heat of steam is 1.99 J/g*C and the enthalpy.H.vap= 40.79 KJ/mol of water

    asked on January 26, 2012
  66. Statistics

    Suppose you know ó and you want an 85 percent confidence level. What value would you use to multiply the standard error of the mean by?

    asked on October 23, 2011
  67. english

    Hi can someone pelase help me explain this quote by Martin Luther King. In addition I also I need to know what the words "personal witness" in the quote mean. Thank you for all your help. "I became convinced that noncooperation with evil is as much a moral

    asked on February 3, 2009
  68. english

    While wearing uniforms does not necessarily guarantee academic success; not wearing uniforms deters students from concentrating on their studies, dress codes can have a positive and negative effect on students. The statement above is my thesis statement on

    asked on May 20, 2008
  69. English

    6a. I lay my book on the table, but now I cannot find it. 6b. I laid my book on the table, but now I cannot find it. I chose B. could you please explain?

    asked on April 28, 2008
  70. Physics

    A person throws a ball upward into the air with an initial velocity of 15.0 m/s. Calculate the following: a.) how high it goes. b.) how long the ball is in the air before it comes back to his hand. c.) at what time(s) will the ball pass a point 8.00 m. If

    asked on September 27, 2011
  71. University Physics

    If vector B is added to vector C = 6.7 + 6.9, the result is a vector in the positive direction of the y axis, with a magnitude equal to that of vector C. What is the magnitude of vector B?

    asked on September 6, 2011
  72. Physics

    A pipe organ is an aerophone with open ended tubes, with esssentially the same physics as the flute. (a) for normal room temperature, where the speed of sound is about 340 m/s how long is the pipe for the A440 note. (b) Suppose someone wanted to install an

    asked on April 18, 2017
  73. us history

    In its initial dealings with Colombia over the Panama Canal, the United States proposed all of the following except a) a six-mile-wide zone; b) a ten-year, non-renewable lease that would then turn control of the canal over to Colombia; c) a yearly payment

    asked on January 17, 2009
  74. Physics

    A car drove 17m/s [N] for 10 seconds, and then speeds up to 25m/s [S] for 7.4 seconds. What is the average speed of the car?

    asked on April 24, 2016
  75. Chemistry

    How much milk at 10.00°C needs to be added to a small 150.0 ml cup of coffee at 95.00 °C to drop the temperature to 90.00°C? Assume coffee and milk have the same specific heat capacity as water: 4.186 J/g °C or 1 cal/ g °C, and they also have the same

    asked on March 1, 2015
  76. physics

    A +50 micro coulomb and 30 micro coulomb charge are placed 50cm apart. a)what is the direction and magnitude of thee electric field at a point P, in between them, that is 10cm from the 30 micro coulomb charge? b)if an electron is placed at rest P, what

    asked on May 3, 2012
  77. Calculus 3

    Show that if a, b, c are in V3, then (a x b) dot [(bxc)x(cxa]) = [a dot (b x c)]^2 I don't know what properties to use

    asked on February 8, 2011
  78. Physics

    okay for a) I got the answer as 11.67 seconds and did v=d/t and for b) i found that wavelength= 6km. Im confused how the 100 m deep affects the equation for c and d. The 2011 Japan tsunami was triggered by an earthquake 70 km offshore. The earthquake

    asked on April 18, 2017
  79. please help, Word problem

    At a local baseball game, the concession stand has two different meal choices. you can get 3 hotdogs and 5 drinks for $25.00 or you can get 6 hotdogs and 4 drinks for $29.00. If the price of hotdogs and drinks is the same for each meal, find how much it

    asked on April 11, 2017
  80. physics

    The top floor of a building is 40m m above the basement. Calculate how much greater the water pressure is in the basement than on the top floor. Express your answer to two significant figures and include the appropriate units.

    asked on April 3, 2014
  81. Chemistry

    What is the Heat Change in kilojoules when 61.5 g of steam is cooled from 111 degrees C to 100 degrees C?

    asked on January 26, 2012
  82. Literary Terms

    What is the difference between Juxtaposition and Antithesis?

    asked on October 27, 2008
  83. pyhsics

    The top floor of a building is 40m m above the basement. Calculate how much greater the water pressure is in the basement than on the top floor. Express your answer to two significant figures and include the appropriate units.

    asked on April 3, 2014
  84. Algebra

    True or False: If an agebraic expression calls for Y=8, that means that you will use the number 8 to replace the letter Y in order to solve the expression?

    asked on January 1, 2013
  85. Physics

    { The subscripts are in curly brackets } A mass m is at rest on a horizontal frictionless surface at t=0. Then a constant force F{0} acts on it for a time t{0}. Suddenly, the force doubles to 2F{0} and remains constant until t=2t{0}. Determine the total

    asked on September 16, 2010
  86. Physics

    You are sitting on a train that is about to drive into a tunnel that is at the base of a large cliff. Just before entering the tunnel, the train blows its whistle, which has a frequency of 600 Hz. (a) What frequency do you hear from the whistle directly?

    asked on April 17, 2017
  87. science

    What property must a substance have if you want to use the substance to make aqueous solution

    asked on March 21, 2017
  88. Statistics

    Compare the standard deviation for the heights of males and the standard deviation for the heights of females in the class.

    asked on March 16, 2014
  89. statistics

    So if a scale has 30 items in it, and if an individual gets a score of 20 what does this mean? The only way to answer this is to look at the standardization sample, find out what the mean score in the sample was, let's say 15, and standard deviation in the

    asked on July 18, 2012
  90. statistics

    So if a depression scale has 30 items in it, and if an individual gets a score of 20 what does this mean? The only way to answer this is to look at the standardization sample, find out what the mean score in the sample was, let's say 15, and standard

    asked on July 18, 2012
  91. physics

    A +50 micro coulomb and 30 micro coulomb charge are placed 50cm apart. a)what is the direction and magnitude of thee electric field at a point P, in between them, that is 10cm from the 30 micro coulomb charge? b)if an electron is placed at rest P, what

    asked on May 3, 2012
  92. Electric Fields

    In a particular region of Earth's atmosphere, the electric field above Earth's surface has been measured to be 151 N/C downward at an altitude of 280 m and 167 N/C downward at an altitude of 430 m. Calculate the volume charge density of the atmosphere,

    asked on October 9, 2011
  93. Physics

    A chair with a mass of 30.0kg is shot with a 10g bullet traveling at a speed of 250m/s. The bullet goes 6cm into the chair. The given kinetic friction for for this problem is .2. How far does the chair slide in cm?

    asked on October 2, 2011
  94. Physics

    Units count. Show all steps, not just the numerical substitutions. Show the equations you used. No information is missing. A person throws a ball upward into the air with an initial velocity of 15.0 m/s. Calculate the following: a.) how high it goes. b.)

    asked on September 26, 2011
  95. science

    If it happens that a neurotransmitter binds to a receptor site and produces a negative voltage shift, the probability: that the neurons are densely connected decreases. of an excitatory response increases. that the receiving neuron will fire decreases.

    asked on November 8, 2010
  96. french

    we have been given a text and have to find words in it. we have to find the word bothers/upsets all i know is that it begins wit 'in' could it be indispose as it is the only word beginning with it we also have to find (here)encounter an it begins with

    asked on November 7, 2009
  97. us history

    hi. can someone please help me find some good quotes that justify american imperalism in the late 1800s and early 1900s thank you

    asked on January 11, 2009
  98. history

    Hi can someone help me with this question By 1828 John C. Calhoun was a. an avowed secessionist b. an out and out sectionist c. a flaming nationalist d. both a sectionist and nationalist I think it is A

    asked on November 9, 2008
  99. history

    hi can someone please help me with these 5 questions. 1. One manifestation of the rising democratic tide in the 1830s was a. a general raising of the political tone b. use of national nominating conventions I think it's a but i don't know why it can't be B

    asked on November 9, 2008
  100. math

    A 70% acid solution is to be mixed with a 40% solution. How many gallons of each solutions are needed?

    asked on October 2, 2014

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