Popular questions and responses by mary
  1. Physics

    Two cars, A and B, travel in a straight line. The distance of A from the starting point is given as a function of time by xA(t)=αt+βt^2, with α=2.60m/s and β=1.20m/s^2. The distance of B from the starting point is xB(t)=γt^2−δt^3, with γ=2.80m/s^2

    asked on September 7, 2014
  2. math

    which is correct restatement of 32% a. thirty two b. thirty two tenths c. thirty two hundredths d. thirty two thousandths

    asked on March 6, 2013
  3. math

    an athlete can run 6 miles in 51 minutes. at this rate, approximately how far could the runner go in 1.5 hours

    asked on March 4, 2013
  4. math

    a new physician saw 841 clients during the first year of her practice and 1,072 the second. which represents the percentage increase in client volume? a. 22% b. 27% c. 78% d. 127%

    asked on March 12, 2013
  5. math

    a satisfaction survey is administered to 568 people. seventy- one people were unsatisfied with the product. which statement is true? a. 1 out of every 8 clients was unsatisfied b. 6 out of 8 clients were satisfied c. 1/4 pf the clients were unsatisfied d.

    asked on March 12, 2013
  6. science

    the team____ won the game is my favorite a. which b. whom c.who d. that

    asked on March 11, 2013
  7. math

    A box is 24 inches long, 10 inches wide, and 10 inches deep. About how many cubic feet is the box?

    asked on November 10, 2019
  8. Physics

    A cylinder is fitted with a piston, beneath which is a spring, as in the drawing. The cylinder is open at the top. Friction is absent. The spring constant of the spring is 4100 N/m. The piston has a negligible mass and a radius of 0.023 m. (a) When air

    asked on April 24, 2007
  9. math

    which would be the approximate metric equivalent to 7 inches? a) 0.63 mm b) 1.4 m c) 12 dm d) 18 cm

    asked on March 12, 2013
  10. prealgebra

    At the same time that a 60-foot tall building casts a shadow that is 21.5 feet long, a nearby tree casts a shadow that is 18 feet long. Which measure is closest to the height of the tree?

    asked on August 15, 2012
  11. Microeconomics

    ADVANCED ANALYSIS Assume the following values for Figures 5.4a and Figures 5.4b. Q1 = 20 bags. Q2 = 15 bags. Q3 = 27 bags. The market equilibrium price is $45 per bag. The price at a is $85 per bag. The price at c is $5 per bag. The price at f is $59 per

    asked on January 19, 2013
  12. physics

    A chair of weight 150 lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of = 38.0 directed at an angle of 41.0 below the horizontal and the chair slides along the floor.Using Newton's laws, calculate , the

    asked on September 23, 2009
  13. math

    a saleman, after deducting his commission of 6%, remits $2491 to his company. The gross amount of the sale amounted to.

    asked on July 16, 2014
  14. ....

    hans uses a wheelchair. although he has a ramp to get in his house he finds it difficult to get his wheelchair up the ramp. which modification would make it easier for hans to get in his house? a. increase the length of the ram b. increase friction between

    asked on March 18, 2013
  15. ....

    p w s a f m i x copy the letters above on a piece of paper. cross out the second and last letters. replace all vowels with letters. double the second letter which letter sequence remains on your page? a. ssfmoi b.cffmmc c.sffmoc d.fscfmc

    asked on March 11, 2013
  16. English

    pwsafmix copy the letter string above on a piece of paper. cross out the second and last letters. Replace all vowels with letter C. insert an O before the second C. cross out the first and third letters. double the second letter. help!

    asked on March 5, 2013
  17. Business English

    Can someone please help? Identify the correct sentence. Question 24 options: A) Not far from the studio is an Italian restaurant, a gas station, and a park that has a running path. b) Not far from the studio are an Italian restaurant, a gas station, and a

    asked on August 5, 2019
  18. pre algebra

    A flower bed is in the shape of a triangle with one side twice the length of the shortest​ side, and the third side is 30 feet more than the length of the shortest side. Find the dimensions if the perimeter is 138 feet

    asked on June 30, 2016
  19. Chem

    Consider the reaction shown: 452 kcal + 4 PCl5 (s) ¨ P4 (s) + 10 Cl2(g) This reaction is ________ because the sign of ƒ¢H is ________. A) exothermic; neither positive nor negative B) endothermic; positive C) endothermic; negative D) exothermic;

    asked on November 3, 2013
  20. Calculus

    An airplane is flying in still air with an airspeed of 325 miles per hour. If it is climbing at an angle of 20°, find the rate at which it is gaining altitude.

    asked on September 29, 2011
  21. physics

    A 30.0-kg child sits on one end of a long uniform beam having a mass of 20.0 kg, and a 43.0-kg child sits on the other end. The beam balances when a fulcrum is placed below the beam a distance of 1.10 m from the 30.0-kg child. How long is the beam?

    asked on July 9, 2015
  22. math

    six hundred and thirty miligrams is equal to how many grams? a) 0.063 g b) 0.63 g c)63 g d) 630,000 g

    asked on March 12, 2013
  23. Physics warming a nail

    2.) Pounding a nail into wood makes the nail warmer. Consider a 5-g steel nail 6 cm long and a hammer that exerts an average force of 500 N on the nail when it is being driven into a piece of wood. The nail becomes hotter. Show that the increase in the

    asked on September 20, 2009
  24. math

    An airline with two types of airplanes, P1 and P2, has contracted with a tour group to provide transportation for a minimum of 400 first class, 900 tourist class, and 1500 economy class passengers. For a certain trip, airplane P1 costs $10,000 to operate

    asked on July 30, 2018
  25. Physics

    1 kg block of ice at 0 degrees celsius placed in cooler. How much heat will the ice remove as it melts to water at 0 degree celsius. I know the answer is 80kcal but don't know the math that backs up the answer-please help!

    asked on June 30, 2009
  26. math - college algebra

    If the rational function y = r(x) has the vertical asymptote x = 9, then as x →9+, either y → ____or _____

    asked on April 7, 2013

    A buffer, consisting of H2PO4− and HPO42−, helps control the pH of physiological fluids. Many carbonated soft drinks also use this buffer system. What is the pH of a soft drink in which the major buffer ingredients are 7.20 g of NaH2PO4 and 4.90 g of

    asked on March 3, 2012
  28. Physic please check

    A +6.00 µC charge is moving with a speed of 7.00 x 10^4 m/s parallel to a very long, straight wire. The wire is 5.00 cm from the charge and carries a current of 63.0 A in a direction opposite to that of the moving charge. Find the magnitude and direction

    asked on November 5, 2007
  29. math

    The total fencing around a square field is 80 yards. The field has an area of how many square yards?

    asked on April 1, 2013
  30. physics

    a 2kg car moving towards the right at 4 m/s collides head on with a 8 kg car moving towards the left at 2 m/s and they stick together. After the collision, the velocity of the combined boides is

    asked on June 6, 2010
  31. Physics

    A woman on a bridge 90.0m high sees a raft floating at a constant sped on the river below. She drops a stone from rest in an attempt to hit the raft. The stone is released when the raft has 6.00m more to travel before passing under the bridge. The stone

    asked on December 28, 2008
  32. Physics

    The drawing shows two surfaces that have the same area. A uniform magnetic field B fills the space occupied by these surfaces and is oriented parallel to the yz plane as shown. If = 17°, find the ratio xz/ xy of the magnetic fluxes that pass through the

    asked on October 11, 2007
  33. physics

    a uniform beam 6.0 metre long and weighing 4kg rests on support at p and q placed left and right 1.0 metres from each end of the beam weights of mass 10 kg and 8kg are placed near p and q respectively one each end of the beam.calculate the reaction at p

    asked on February 1, 2016
  34. math

    A rectangular field is 35 m longer than it is wide. The length of the fence around the perimeter of the field is 290 m. What are the dimensions (length and width) of the fence?

    asked on January 4, 2013

    An unknown salt is either KBr, NH4Cl, KCN, or K2CO3. If a 0.100 M solution of the salt is neutral, what is the identity of the salt?

    asked on February 16, 2012
  36. Physics HELP!!!!!!!!

    The brass bar and the aluminum bar in the drawing are each attached to an immovable wall. At 29°C the air gap between the rods is 2 x 10^-3 m. At what temperature will the gap be closed? The length of the brass rod is 2.0m The lenght of the aluminum rod

    asked on April 14, 2007
  37. Chemistry help please

    i need some help understanding this problem please. How many moles of O are there in 32.4g N2O5, how many oxygen and nitrogen atoms are there in the 32.4g?

    asked on March 31, 2012
  38. math

    A college student takes a standardized test and scores a 163. If the mean is 155 and the standard deviation is 7, what is the student’s percentile rank? (Assume a normal distribution.)

    asked on February 14, 2017
  39. Chemistry

    1) How does the atomic radius change from left to right across a period in the periodic table? A) It tends to decrease*** B)It tends to increase C) It first increases, then decreases D) It first decreases, then increases 2) What is the charge of a cation?

    asked on October 18, 2016
  40. Physic please help!

    The electrons in the beam of a television tube have a kinetic energy of 2.10 10-15 J. Initially, the electrons move horizontally from west to east. The vertical component of the earth's magnetic field points down, toward the surface of the earth, and has a

    asked on September 29, 2007
  41. ....

    in the digestive tract, mouth is to bolus as a. stomach is to chyme b. gallbladder is to insulin c. small intestine is t carbohydrates d. esophagus is to peristalsis

    asked on March 18, 2013
  42. Physics - electrons/protons

    If you place a free electron and a free proton in the same electric field, how do the forces acting on them compare? How do their accelerations compare? Their directions of travel? My answer: Direction of travel: The proton and electron would move towards

    asked on October 4, 2009
  43. U.S. and Global Economics

    An online store that has been successfully growing on its initial angel investment and revenues wants to invest $5 million to expand the business. The bank is willing to lend the business this money at a 10 percent interest rate over an eight-year term.

    asked on November 11, 2013
  44. math

    The amount of bacteria after n min if the initial amount of bacteria is q and the amount of bacteria triples every 30 sec. (Hint: The answer should contain q as well as n.)

    asked on August 18, 2012
  45. math

    In the following, write an expression in terms of the given variables that represents the indicated quantity: a. The cost of having a plumber spend h hr at your house if the plumber charges $30 for coming to the house and $x per hour for labor b. The

    asked on August 18, 2012
  46. chemistry

    how many grams of NaCl (molecular weight 58.5) should be used to prepare 20 liters of a solution containing 154mEq/L?

    asked on February 27, 2011
  47. Geometry

    1) What are the converse, inverse, and contrapositive of the statement? Which statements are true? If the figure is a rectangle with sides 2 cm and 3 cm, then it has a perimeter of 10cm. My A: the statement is not true. 2) What are the hypothesis and the

    asked on October 7, 2016
  48. CAL-Help on dr/dt

    A circular oil slick of uniform thickness is caused by a spill of 1 cubic meter of oil. The thickness of the oil is decreasing at the rate of 0.1 cm/hr as the slick spreads. (Note: 1 cm = 0.01 m.) At what rate is the radius of the slick increasing when the

    asked on December 29, 2014
  49. U.S. and Global Economics: Involving MATH

    PLZZZ.. Help I just don't understand how to calculate this A landlord wants to acquire an additional apartment building for $250,000. The new building contains eight apartment units, which will each rent for $500 per month. The bank is willing to loan the

    asked on November 13, 2013
  50. science

    in the digestive tract, mouth is bolus to a. stomach is to chyme b. gallbladder is to insulin c. small intestine is to carbohydrate d. esophagus is to peristalsis

    asked on March 18, 2013
  51. Chemistry-Bonding

    Classify the following bonds as ionic, covalent, or neither (O, atomic number 8; F, atomic number 9; Na, atomic number 11; Cl, atomic number 17; U, atomic number 92). a.) O with F _________ b.) Ca with Cl __________ c.) Na with Na _________ d.) U with Cl

    asked on November 13, 2009
  52. maths

    Ten blackberry plants started growing in my yard. Absent constraint, blackberries will spread by 200% a month. My yard can only sustain about 50 plants. Using the logistic growth model, a. Write a recursive formula for the number of blackberry plants in my

    asked on July 18, 2012
  53. geometry

    The diameter and height of this cylinder are equal to the side length, S, of the cube in which the cylinder is inscribed. What is the expression for the cylinder's volume?

    asked on March 2, 2015
  54. ....

    what is the southernmost city listed on the map a. Richmond b.San Jose c.Detroit d.Houston

    asked on March 6, 2013
  55. science

    mara is preparing an experiment using three cups - one made of paper, one of plastic, and one of glass- as shown below. she plans pouring 50 ml of hot water from a pitcher into each of three cups and recording the temperatures in 5- minute intervals. what

    asked on March 6, 2013
  56. physics

    At a low point in its swing, a pendulum bob with a mass of 0.2kg has a velocity of 4m/s. Ignoring air resistance, how high will the bob swing above the low point before reversing direction? Please explain and show work.

    asked on March 9, 2012
  57. Chemistry

    Calculate the change in heat for the reaction SO2 + 1/2O2 --> SO3

    asked on November 2, 2010
  58. Probaility

    The rates of on time flights for commercial jets are continuously tracked by the US Department of Transportation. Recently, Southwest Air had the best rate of 80% of its flight time on time. A test is conducted by randomly selecting 15 southwest flights

    asked on December 5, 2006
  59. s.s.

    How did Augustus change the Roman Republic? How did Augustus pave the way for 200 years of peace and prosperty? Plz plz help me

    asked on April 24, 2018
  60. Physics

    On a winter day the temperature drops from -5 degree C to -15 degree C overnight. If a pan sitting outside contains 0.40kg of ice, how much heat is removed from the ice for the temperature change? (specific heat (ice) = .5kcal/kg) Is it 02.0kcal?

    asked on July 9, 2010
  61. Physics

    a system consists of four particles how many terms appear in the expression for the total gravitational potential energy of the system

    asked on October 22, 2011
  62. Math

    Zoe keeps track of the miles per gallon her car gets per week. She has accumulated the following data: (1, 24), (2, 24.38), (3, 24.76), (4, 25.14) A. The common difference is 0.38 B. The common difference is 0.76 C. The common ratio is 0.99 D. The common

    asked on November 10, 2015

    A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = 2.5 N/C, Ey = Ez = 0. If the velocity of the particle at t = 0 is given by vy = 50 m/s, vx = vz = 0, what is the speed of the

    asked on April 29, 2015
  64. Physics

    A sled is being held at rest on a slope that makes an angle (theta) with the horizontal. After the sled is released, it slides a distance (d1) down the slope and then covers the distance (d2) along the horizontal terrain before stopping. Find the

    asked on October 13, 2011
  65. English

    The students felt fairly prepared for whatever tests their instructors might give them, after years of intense studying, however difficult the test might be. which group of words is misplacef in the sentence above? a.however difficult they might be b. the

    asked on March 5, 2013
  66. Elementary Statistics

    Heights of women have a bell-shaped distribution with a mean of 161 cm and a standard deviation of 7 cm. Using Chebyshev’s theorem, what do we know about the percentage of women with heights that are within 2 standard deviations of the mean? What are the

    asked on September 4, 2012
  67. finance

    Orbital Communications has operating plants in over 100 countries. It also keeps funds for transaction purposes in many foreigh countries. Assume tha tin 2010 it held 100,000 kronas in Norway worth $35,000. The funds drew 12 percent interest, and the krona

    asked on May 26, 2011
  68. Math

    350 is 70% of what number? A) 500 B) 420 C) 245 D) 280 What percent of 64 is 24? A) 267% B) 62.5% C) 40% D) 37.5% What percent of $6.50 is $2.60? A) 25% B) 40% C) 90% D) 250% 20% of 140 is what number? A) 280 B) 120 C) 28 D) 12

    asked on January 8, 2016
  69. math 5th grade

    Victoria has 2 pounds of flour she uses 2/5 of flour for pizza and 3/10 of the flour for bread. Find the weight of the flour she has left. Express in decimal form. I worked on this and the answer I came up with was 19.2 lbs left?

    asked on November 19, 2015
  70. U.S. Government and Politics

    Describe how subjectivity and other factors affect a person's calculation of cost and benefit. Give an example of a cost-benefit analysis.

    asked on September 25, 2013
  71. Physics

    The hammer throw is a track-and-field event in which a 7.30-kg ball (the hammer) is whirled around in a circle several times and released. It then moves upward on the familiar curved path of projectile motion and eventually returns to the ground some

    asked on October 7, 2011
  72. Physics please check

    Please tell me where i went wrong. During an all-night cram session, a student heats up a one-half liter (0.50 10-3 m3) glass (Pyrex) beaker of cold coffee. Initially, the temperature is 19°C, and the beaker is filled to the brim. A short time later when

    asked on April 13, 2007
  73. math

    Five males with a particular genetic disorder have one child each. The random variable x is the number of children among the five who inherit the genetic disorder. Determine whether the table describes a probability distribution. If it​ does, find the

    asked on July 23, 2019
  74. Physics

    How much does it cost to operate a 23-W porch light for 24 h if electric energy costs 8¢/kWh?

    asked on February 17, 2017
  75. science

    which structure is common to both prokaryotic and eukaryotic cells ? a. mitochondria b. cell membrane c. endoplasmic reticulum d. pladtids

    asked on March 12, 2013
  76. chemistry

    How does Le Chatelier's principle explain the result you obtained when you added HCL to a suspension of Ca(OH)2 in water? Where the result was, precipiatate dissappeared and an increase in temperature resulted.

    asked on October 9, 2011
  77. geometry

    The surface area of a rectangular prism is 190 square inches, the length is 10 inches, and the width 3 inches. Find the height. I know how to do SA but I don't understand how to find height if you have SA given. The answer is 5 in but I am not able to come

    asked on May 23, 2011
  78. math

    a bag of marbles can be divided in equal shares among 2,3,4,5, or 6 friends. What is the least number of marbles that the bag could contain?

    asked on April 20, 2011
  79. Chemistry/Equilibrium calculations

    At 1200 K, the approximate temperature of vehicle exhaust gases, Kp for the reaction 2CO2(g)->

    asked on August 16, 2008
  80. American Government

    Check answers? 1) What is the main difference between the formal and informal qualifications for the House of Representatives? A) Formal qualifications are outlined in the Constitution**** B) Formal qualifications do not have to be followed C) Informal

    asked on October 7, 2016
  81. Calculus

    Suppose a ball is thrown straight up into the air, and the height of the ball above the ground is given by the function h(t) = 6 + 37t – 16t2, where h is in feet and t is in seconds. At what time t does the ball stop going up and start returning to

    asked on October 17, 2014
  82. Calculus

    The population of a colony of bacteria is modeled by the function p(x)=50(e^-x - e^-x^2)+10 , for 0 ≤ x, where population P is in thousands, x is in hours, and x = 0 corresponds to the moment of introduction of a certain chemical into the colony's

    asked on October 16, 2014
  83. Math

    You & a friend are at Paul & Elizabeth's Restaurant for a night of fine dining. You can choose among 2 appetizers, 4main dishes, & 3 desserts. Appetizer: soup or salad Main Dish: fish, chicken, beef, vegetarian Dessert: chocolate cake, apple pie, ice cream

    asked on November 12, 2013
  84. math

    A rectangular field is 35 m longer than it is wide. The length of the fence around the perimeter of the field is 290 m. What are the dimensions (length and width) of the fence?

    asked on January 4, 2013
  85. english

    I need to combine the following sentence by changing the Italicized group of words into a gerund or gerund phrase. Then write the complete sentence using (prepositional phrase with a gerund object) I watch for the sales. This way I save money.

    asked on April 8, 2011
  86. Chemistry

    The delta G^o for a reaction : h2 (g) + i2 (g) = 2HI(g) Is 2.6 kj/moles. In one experiment the initial pressures are P h2 = 4.26 atm, P i2 = 0.024 atm, P hi = 0.23 atm. Calculate delta G

    asked on May 9, 2017
  87. chemistry

    Express the composition of each of the following compounds as the mass percents of its elements...? 59) Express the composition of each of the following compounds as the mass percents of its elements. a) formaldehyde, CH2O b) glucose, C6H12O6 c) acetic

    asked on January 26, 2017
  88. Business law

    Ashley sees a maintenance crew from Acme Co. beginning to resurface her driveway, a service she has not contracted for. Ashley thinks a new driveway would be good, so she doesn’t say anything. If Acme sues Ashley for the value of the resurfacing, (Points

    asked on January 26, 2014
  89. ap chem

    The allene molecule has the following Lewis structure: H2C=C=CH2. Are all four hydrogen atoms in the same plane? The allene molecule has the following Lewis structure: H2C=C=CH2. Are all four hydrogen atoms in the same plane? If not, what is the spatial

    asked on December 28, 2012
  90. Physics

    A large calorie (Cal) is the amount of heat needed to change the temperature of one __________ of water by one degree Celsius. Is it gram or kilogram?

    asked on July 9, 2010
  91. 7th grade science

    blood type is an example of what type of inheritance?

    asked on December 13, 2009
  92. Math

    A collection of 30 coins worth $5.50 consists of nickels, dimes, and quarters. There are twice as many dimes as nickels. How many quarters are there?

    asked on September 9, 2008
  93. Physic please check

    A constant magnetic field passes through a single rectangular loop whose dimensions are 0.35 m x 0.55 m. The magnetic field has a magnitude of 2.1 T and is inclined at an angle of 55° with respect to the normal to the plane of the loop. (a) If the

    asked on November 5, 2007
  94. Algebra

    The prices of the systems are: $1200 for System 1, $1500 for System 2, $1600 for System 3, and $1800 for System 4. Write the information from the table as a 4 x 3 matrix B. Write a row matrix A for which the entries represent the prices for the systems. If

    asked on July 30, 2018
  95. Ela

    Can you help me with the final check:Relating to Parents chapter 17

    asked on October 25, 2016
  96. statistics

    A manufacturer has a maximum of 240, 360, and 180 kilograms of wood, plastic and steel available. The company produces two products, A and B. Each unit of A requires 1, 3 and 2 kilograms of wood, plastic and steel respectively; each unit of B requires 3, 4

    asked on August 8, 2016
  97. Science

    Which of the following best describes the result of using a catalyst in a chemical reaction? A. The yield of product is increased. B. A more desirable product is often formed. C. A greater amount of heat energy is released by the reaction. D. The reaction

    asked on January 19, 2016
  98. Physics

    Which one of the following actions would make the maxima in the interference pattern from a grating move closer together? Decreasing the frequency of the laser. Increasing the frequency of the laser. Increasing the number of lines per length. Increasing

    asked on August 7, 2015
  99. Maty

    Best Rentals charges a daily fee plus a mileage fee for renting its cars. Barney was charged $111.00 for 3 days and 300 miles, while Mary was charged $198.00 for 5 days and 600 miles. What does Best Rentals charge per day and per mile?

    asked on October 25, 2014
  100. chemistry

    What is the oxidizing agent in the following reaction? Cl2 (g) + 2Na+ (aq) + 2Br- (aq) --> 2Na+ (aq) + 2Cl- (aq) + Br2 (l)

    asked on November 8, 2011


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