Elle

Most popular questions and responses by Elle
  1. Physics

    An asteroid is moving along a straight line. A force acts along the displacement of the asteroid and slows it down. The asteroid has a mass of 4.5× 104 kg, and the force causes its speed to change from 7000 to 5000m/s. (a) What is the work done by the

    asked on April 4, 2014
  2. Physics.. please help!!!!!

    A ball of mass 0.4 kg, initially at rest, is kicked directly toward a fence from a point 20 m away, as shown below. The velocity of the ball as it leaves the kicker’s foot is 16 m/s at angle of 46◦ above the horizontal. The top of the fence is 4 m

    asked on October 20, 2011
  3. Chemistry

    A coffee-cup calorimeter initially contains 125 g water at 24.2 degrees celsius. Potassium bromide (10.5 g), also at 24.2 degree celsius, is added to the water, and after the KBr dissolves, the final temperature is 21.1 degrees celsius. Calculate the

    asked on February 13, 2012
  4. Physics

    When subjected to a force of compression, the length of a bone (compression Young's modulus 9.4 x 109 N/m2, tensile Young's modulus 1.6 x 1010 N/m2) decreases by 1.5 x 10-5 m. When this same bone is subjected to a tensile force of the same magnitude, by

    asked on April 25, 2014
  5. Chemistry

    How many milliliters of .200 M NaOH solutions are needed to react with 40.0 mL of a 0.340 M NiCl2 solution? Equation: NiCl2(aq) + 2NaOH(aq) --> Ni(OH)2(s) +2NaCl(aq)

    asked on July 20, 2015
  6. Math

    A club consists of 8 seniors, 7 juniors, and 4 sophomores. A subcommittee consisting of 3 seniors, 2 juniors, and 1 sophomore will be chosen. How many different such subcommittees are there?

    asked on April 11, 2013
  7. chemistry

    Determine the theoretical and percent yield of hydrogen gas is 36 g of water undergoes electrolysis to produce hydrogen and oxygen and 3.8 g of hydrogen is collected.

    asked on February 8, 2012
  8. pre algebra

    when rounding 4m to the nearest meter

    asked on December 18, 2018
  9. physics

    A speeder traveling at 30 m/s passes a motorcycle policeman at rest at the side of the road. The policeman accelerates at 2.4 m/s2. To the nearest tenth of a second how long does it take the policeman to catch the speeder?

    asked on February 7, 2014
  10. physics

    A spring (k = 905 N/m) is hanging from the ceiling of an elevator, and a 4.8-kg object is attached to the lower end. By how much does the spring stretch (relative to its unstrained length) when the elevator is accelerating upward at a = 0.74 m/s2?

    asked on April 25, 2014
  11. Physics

    A long solenoid has 1400 turns per meter of length, and it carries a current of 2.0 A. A small circular coil of wire is placed inside the solenoid with the normal to the coil oriented at an angle of 90.0˚ with respect to the axis of the solenoid. The coil

    asked on October 19, 2014
  12. Chemistry

    A portable electric water heater transfers 255 watts (W) of power to 5.5 L of water, where 1 W = 1 J/s. How much time (in minutes) will it take for the water heater to heat the 5.5 L of water from 25 degrees celsius to 42 degrees celsius? (Assume that the

    asked on February 9, 2012
  13. Physics

    An object is placed in front of a converging lens in such a position that the lens (f = 13.2 cm) produces a real image located 23.5 cm from the lens. Then, with the object remaining in place, the lens is replaced with another converging lens (f = 18.8 cm).

    asked on December 1, 2014
  14. Chemistry

    25.0 mL of ethanol (density = 0.789 g/mL) initially at 7.0 degrees celsius is mixed with 35.0 mL of water (density = 1.0 g/mL) initially at 25.3 degrees celsius in an insulated beaker. Assuming that no heat is lost, what is the final temperature of the

    asked on February 9, 2012
  15. Statistics, Math

    What statistical tool should be used to determine the influence of independent variable to dependent variable?

    asked on April 18, 2019
  16. Astronomy

    Hi, can you please check my work? I really need to do well on this. 1. What properties of a star are needed to calculate the stars luminosity? a. size and apparent brightness b.mass and distance to the star**** c. temperature and diameter of the star d.

    asked on December 9, 2016
  17. Algebra

    a radio commercial for a loan company states: "You only pay 10 cents a day for each $500 you borrowed." If you borrow $2000 for 50 days, what amount will you repay.

    asked on April 27, 2018
  18. Geometry

    Find the coordinates of point B on Line AC such that AB is 2/3 of AC (B is located in between A and C). A is (1,-5) and C is (-5,4).

    asked on February 15, 2019
  19. math

    A glass is 1 4 full. Then 70cm3 of orange juice is poured in. The glass is now 3 5 full. What is the total volume of the glass?

    asked on March 3, 2019
  20. Pharmacy Calculaions

    I can't get this right! Please help... Based on the formula below, what quantities of each are needed to make 180 ml of this lotion? Benzyl Benzoate 250 ml Triethanolamine 5 ml Oleic Acid 20 ml Purified water to make 1000 ml

    asked on February 21, 2013
  21. Math

    Show that f(x) = x3 and g(x) = 200x3 grow at the same rate

    asked on May 30, 2018
  22. physics

    how many revolutions per minute would a 15 m ferris wheel need to make for passengers to feel weightless at the top?

    asked on January 2, 2011
  23. chemistry

    If the amount of mercury in a polluted lake is 0.40 ug/mL, what is the total mass of mercury in the lake? (The lake has a surface area of 100 mi squared and an average depth of 25 ft).

    asked on September 12, 2011
  24. Physic

    Copy of Vector A has a magnitude of 9 and is at an angle of 30.4 degrees measured counter-clockwise from the x axis. Vector B has a magnitude of 12 and is at an angle of 102.3 degrees measured counter-clockwise from the x axis. Vector C has a magnitude of

    asked on September 24, 2015
  25. Physics

    A planet has a mass of 6.15 × 1023 kg and a radius of 3.25 × 106 m. (a) What is the acceleration due to gravity on this planet? (b) How much would a 79.4-kg person weigh on this planet?

    asked on February 28, 2014
  26. math

    a light year is the distance light travels in one year. one light year is about 5.9x10^12 mi. If it takes light 3 months to travel from one star to another, about how far apart are the stars? 5.9x10^12/12*3 I got 1.5x10^12 mi Is this correct?

    asked on January 9, 2014
  27. binomial distribution

    hey, i'd really appreciate some help with this question: A medical treatment is successful 75% of the time. A hospital wishes to treat a group of patients. How many patients should they take so that the probablity that all are cured is 1/10? I know that

    asked on August 25, 2007
  28. Physics

    Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the naturally occuring electrons is removed. The radius of the orbit is 2.26 × 10-11 m. Determine the magnitude of the

    asked on September 4, 2014
  29. physics

    When subjected to a force of compression, the length of a bone (compression Young's modulus 9.4 x 109 N/m2, tensile Young's modulus 1.6 x 1010 N/m2) decreases by 1.5 x 10-5 m. When this same bone is subjected to a tensile force of the same magnitude, by

    asked on April 25, 2014
  30. Math

    How many different functions are there from a set with 10 elements to sets with the following numbers of elements? a) 2 b) 3 c) 4 d) 5

    asked on April 28, 2009
  31. Maths - Reiny

    Show that the equation 3x^2 - x^3 + 3 = 0 can be rearranged to give: x = 3 + 3 ---- x^2 x^3 = Divide by ? = x = 3 + 3 ---- x^2 Using Xn+1 = 3 + 3 with x0 = 3.2 ---- x^2n find the values of x1 x2 and x3? What to the values of x1 x2 and x3 represent? The

    asked on January 3, 2017
  32. Physics

    A volleyball is spiked so that it has an initial velocity of 15.6 m/s directed downward at an angle of 56.9 ° below the horizontal. What is the horizontal component of the ball's velocity when the opposing player fields the ball?

    asked on February 21, 2014
  33. Physics

    A skater with an initial speed of 5.90 m/s stops propelling himself and begins to coast across the ice, eventually coming to rest. Air resistance is negligible. (a) The coefficient of kinetic friction between the ice and the skate blades is 0.125. Find the

    asked on March 14, 2014
  34. Physics

    Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the naturally occuring electrons is removed. The radius of the orbit is 2.26 × 10-11 m. Determine the magnitude of the

    asked on September 5, 2014
  35. Physics

    A 4.07 x 10-2-kg block is resting on a horizontal frictionless surface and is attached to a horizontal spring whose spring constant is 144 N/m. The block is shoved parallel to the spring axis and is given an initial speed of 10.5 m/s, while the spring is

    asked on May 2, 2014
  36. Physics

    A space probe is traveling in outer space with a momentum that has a magnitude of 7.84 x 107 kg·m/s. A retrorocket is fired to slow down the probe. It applies a force to the probe that has a magnitude of 1.29 x 106 N and a direction opposite to the

    asked on April 10, 2014
  37. Geometry

    PQR is congruent to DJE. complete the statement below PR is congruent to __, DJ is congruent to __ angle E is congruent to __ 1) PR is congruent to PQ, DJ is congruent to PQ, angle E is congruent to angle R 2) PR is congruent to DE, DJ is congruent to DR,

    asked on January 15, 2012
  38. Physics help!!

    A team of dogs drags a 150 kg sled 1.39 km over a horizontal surface at a constant speed. The coefficient of friction between the sled and the snow is 0.236. The acceleration of gravity is 9.8 m/s^2. Find the work done by the dogs. Also, What is the energy

    asked on December 1, 2011
  39. Algebra

    x -4 -3 -2 -1 0 1 2 3 4 y 18 8 0 -6 -10 -12 -12 -10 -6 What is the vertex of the parabola? The x-coordinate is 1.5.

    asked on April 13, 2018
  40. Chemisty

    16.72g of sodium acetate trihydride (MW=136 g/mol) is dissolved in 100mL water. To this, 4.00g glacial acetic acid (Ka=2.2x10-5, MW=60.0 g/mol) is added, and distilled water is added to to the 500mL mark. Find the final pH and the molar concentration of

    asked on January 20, 2012
  41. Physics help!!

    A crate is pulled to the right with a force of 80 N, to the left with a force of 125.8 N, upward with a force of 615.4 N, and downward with a force of 248 N. Net external force in the x direction: -45.8 Net external force in the y direction: 367.4 N how do

    asked on November 11, 2011
  42. Algebra

    A total of 8000 dollars is invested in two funds paying 4 percent and 5 percent annual interest,. The combined interest for the year is 350 dollars. How much of the 8000 dollars is invested in each fund?

    asked on April 13, 2018
  43. Physics

    A 61.5-Ω resistor is connected in parallel with a 146.6-Ω resistor. This parallel group is connected in series with a 16.0-Ω resistor. The total combination is connected across a 13.6-V battery. Find (a) the current and (b) the power dissipated in the

    asked on October 3, 2014
  44. Physics

    two groups of paddlers meet in the middle of a lake. after a brief visit a person in canoe 1 pushes on canoe 2 with a force of 46 N . Mass of canoe 1 is 150 kg and mass of canoe 2 is 250 kg. find acceleration of each canoe

    asked on March 27, 2014
  45. Chemistry

    Hydrogen and oxygen gas combine explosively to produce water. Write a balanced chemical equation for this process. If 10 mol of hydrogen reacted with oxygen, what volume of liquid water could be produced?

    asked on October 14, 2010
  46. circular (trigonometric) functions

    hi, i need help solving this trigonometric equation: sinx+3cosx=0 i don't know what to do as i can't just diviide the two to create tanx which is what i have been doing in previous questions... yes, you are on the right track sinx = -3cosx sinx/cosx = -3

    asked on April 14, 2007
  47. Dividing decimals

    How do you solve 49.05 divided by 2.5. Need to see step by step process.

    asked on March 2, 2014
  48. Quantum Physics

    Calculate the transition ratio between the 2P-1S and 3P-2S states of the hydrogen.

    asked on May 16, 2018
  49. Math

    In a state legislature there were 119 more members in the House of Representatives than in senate. If there were m members in senate, write an expression to represent the totial members in the state legislature. PLZ HELP!!!!!

    asked on March 28, 2017
  50. Physics

    A 4.07 x 10-2-kg block is resting on a horizontal frictionless surface and is attached to a horizontal spring whose spring constant is 144 N/m. The block is shoved parallel to the spring axis and is given an initial speed of 10.5 m/s, while the spring is

    asked on May 2, 2014
  51. World History

    What factor led the English to attempt to kill off entire Native American peoples? A. Native Americans provided a good labor source for the Spanish. B. Native Americans had vast wealth to exploit for tribute. C. The Native Americans' large populations were

    asked on September 6, 2012
  52. Physics

    Two bullets have masses of 2.4 g and 5.2 g, respectively. Each is fired with a speed of 37.0 m/s. a) What is the kinetic energy of the first bullet? b) What is the kinetic energy of the second bullet? I initially used KE=1/2MV^2 and got 1642.8 J, but got

    asked on November 29, 2011
  53. Pre-calculus

    Given the following values for f(t): t : f(t) 3 : -7 6 : 6 9 : 19 12 : 6 15 : -7 18 : 6 a) What is the period, frequency, midline, amplitude, maximum, and minimum? b)Find a possible formula for f(t) c)Find the domain and range of f(t) d)Find a formula for

    asked on March 26, 2009
  54. Algebra

    What is the length of the interval of solutions to the inequality 1 ( is less than or equal to) 3-4x (is less than or equal to) 9? I presume that I just plug in numbers for x? The problem is, that all the positive numbers I've tried have made them way less

    asked on January 20, 2009
  55. Math

    Which property is shown by 3+2 = 2+3 A Commutative property of addition B identity property of addition C distribute property D associative property

    asked on October 3, 2018
  56. Maths

    The first 5 terms of an arithmetic sequence are: 7 13 19 25 31 Prove that the difference between the squares of any two terms of the sequence is always a multiple of 24 Nth term = ? Nth term squared = ? Mth term = ? Mth term squared = ? Difference = ? ? =

    asked on January 3, 2017
  57. pre calculus

    find 2 solutions of tan θ=.6524 in both degrees and radians. I know the answer are 33.12 degrees/.578 radians and 213.12 degrees/3.72 radians, but how do you find this? Thanks!!!!

    asked on November 15, 2015
  58. Chemistry

    How would you write the equation to represent "Nitrogen and Oxygen react to form Nitrogen Dioxide".

    asked on October 4, 2015
  59. physic

    A baseball is hit from home plate and it winds up in the stands as a homerun. From the point it was hit, it lands a horizontal displacement of 121.9 meters and a vertical displacement of 21.2 meters (in +y direction). If it took 5 seconds to travel from

    asked on September 24, 2015
  60. Physics

    An object is placed to the left of a lens, and a real image is formed to the right of the lens. The image is inverted relative to the object and is one-half the size of the object. The distance between the object and the image is 65 cm. (a) How far from

    asked on December 1, 2014
  61. Physics

    A skateboarder shoots off a ramp with a velocity of 5.7 m/s, directed at an angle of 58° above the horizontal. The end of the ramp is 1.3 m above the ground. Let the x axis be parallel to the ground, the +y direction be vertically upward, and take as the

    asked on February 21, 2014
  62. math

    one candy bar contains 220 calories. If this represents 10% of the total calories a person consumes in one day, find the total number of calories consumed in a day. 220/x=10/100 cross multiply so x=2200 is this correct? thanks

    asked on October 29, 2013
  63. math

    simplify 4^8/4^-4 Would this be 4^4 the correct answer?

    asked on October 14, 2013
  64. math

    the expression 10x^2+6x^3 is the result of applying the distributive property to the expression 2x^2(5+3x). write the expression such that you applied the distributive to your expression it will give the result presented 1) m^2(a+b)+m^3(a+b) for this I got

    asked on October 10, 2013
  65. Physics

    Two objects are connected by a string with a mass less, friction less pulley. The coefficient of friction is .298. The block on the table is 4 kg. What must the mass of the hanging block be so that the block on the table will move with a constant speed?

    asked on November 19, 2012
  66. organic chem

    if sulfuric acid was not added to isopentyl alcohol how would that affect the results

    asked on February 14, 2012
  67. trig

    You are sky diving and are trying to land on a target with a radius of 15 m. You land 10 m west and 10 m north of the center of the target. a. Write an inequality to describe the region inside the target area. b. Do you land within the target area? c. If

    asked on December 20, 2011
  68. Trig!

    The identities cos(a-b)=cos(a)cos(b)sin(a)sin(b) and sin(a-b)=sin(a)cos(b)-cos(a)sin(b) are occasionally useful. Justify them. One method is to use rotation matricies. Another method is to use the established identities for cos(a+b) and sin (a+b).

    asked on September 27, 2011
  69. Physics

    A satellite has an orbit with pedigree 175 km and apogee 181,200 km. What is the period of the orbit? >>I'm not sure what the associated equation is. I tried the problem using the average radius in the period equation but it didn't work. Please help!

    asked on May 9, 2009
  70. Math

    How many different functions are there from a set with 10 elements to sets with the following numbers of elements? a) 2 b) 3 c) 4 d) 5

    asked on April 27, 2009
  71. college earth science and astronomy

    This isn't homework as much as I am trying to learn this on my own. I am trying to perform an experiment on solar power. I measured and recorded the volume (V= 250 mL) and mass (M= 250 g) of water in a cup. I then recorded the initial temperature(32

    asked on March 18, 2009
  72. Another binomial distribution question

    hi, i'd also really like some help for another binomial distribution question, i have no idea where to start... the question is: A manufacturer makes 10,000 ball point pens per day and estimates that 400 will be defective. She decides that if a random

    asked on August 25, 2007
  73. equations of tangents and normals

    hi, i'd really appreciate some help solving this question! I am completely at loss here :/ The question is to: Find the equation of the normal to y=loge(x+2) which is parallel to the line with equation y+3x-5=0 I am fine at solving these sorts of equations

    asked on May 20, 2007
  74. Science

    What do I mix to make a skin bomb?

    asked on July 3, 2018
  75. Math

    Find the measure of two complementary angles if the measure of one angle is 30˚ greater than the measure of the other. What is the measure of the larger angle? What is the measure of the smaller angle?

    asked on February 24, 2018
  76. Maths

    Here is a right- angled triangle. |\ | \ x | \ |___\ x - 2 All measurements are in centimetres. The area if the triangle is 2.5cm^2. Find the perimeter of the triangle. Key values: Equation for area: ? - __(___) = ? ? Quadratic equation: -b ± √b^2 - 4ac

    asked on January 3, 2017
  77. physic

    A ball is dropped from the top of an apartment building. A person is on a patio somewhere beneath the top of the apartment building and the person notices the ball takes 0.11 seconds to fall from the top of his patio to the bottom of his patio. The height

    asked on September 24, 2015
  78. Trig

    The graph of y-7 cosθ + 24 sinθ would be a sinusoid if it were plotted. What would be the first positive value of θ at which there is a high point?

    asked on April 22, 2015
  79. Math

    Whars 189.80. Times 6.25% less 33 1/3 % Is it 189.80 + 11.86 = 201.66 - 67.22 = $134..44

    asked on November 14, 2014
  80. Physics

    A 74.2-kg climber is scaling the vertical wall of a mountain. His safety rope is made of a material that, when stretched, behaves like a spring with a spring constant of 1.62 x 103 N/m. He accidentally slips and falls freely for 0.959 m before the rope

    asked on May 2, 2014
  81. Physics

    A pitcher throws a 0.192-kg baseball, and it approaches the bat at a speed of 43.2 m/s. The bat does 69.8 J of work on the ball in hitting it. Ignoring air resistance, determine the speed of the ball after the ball leaves the bat and is 32.6 m above the

    asked on April 4, 2014
  82. math

    when 7x^4-49x^3+7x^2 is divided by 7x^2, the quotient is when I divided I got x^2-7x+1 Is this correct?

    asked on October 17, 2013
  83. math

    Part 1 : Store equipment is purchased on January 1, 2002 at a cost of $14,000 and $1,000 was spent on its installation. The depreciation is written-off at 10% on the original cost every year. The books are closed on December 31, every year. Instructions:

    asked on March 28, 2013
  84. Physics

    A 1.1 kg lizard lies on a flat rock tilted. A person decides to tilt the rock hoping that the lizard falls off. The rock is tilted at an angle of 15 degrees with respect to the horizontal. The coefficient between the rock and the lizard is .16. What is the

    asked on November 19, 2012
  85. Physics.. please help!!!!!

    A crate is pulled to the right with a force of 80 N, to the left with a force of 125.8 N, upward with a force of 615.4 N, and downward with a force of 248 N. What is the net external force in the x direction? y direction?? Also.... What is the magnitude of

    asked on November 9, 2011
  86. Physics.. please help!!!!!

    A person walks 28.2◦ north of east for 3.33 km. Another person walks due north, then due east to arrive at the same location. How far due north would this person walk? How far would this person walk due east?

    asked on October 9, 2011
  87. algebra 1

    I was given this interesting problem: The length of a rectangle is 6 feet longer than its width. The perimeter is less than 48 feet. Write a mathematical expression for the width of the rectangle. How do I go about doing this?

    asked on July 4, 2011
  88. chemistry

    How many grams are required to make 1.5 L of 3.0 M hydrochloric acid (HCl) solution?

    asked on March 28, 2011
  89. Math

    Lee has two tests to study for: Chemistry and French. She plans to study for up to 13h in total. She will spend at least 4 hours studying Chemistry and up to 6 hours studying French. Let x represent the number of hours she will spend studying Chemistry,

    asked on July 24, 2009
  90. Healthcare Management

    What are the most important functions of health information management? (thank you in advance for your help)

    asked on July 6, 2009
  91. science

    ecologists usually study a specfic populaions of organisms rather than studying the entire species why?

    asked on September 16, 2008
  92. maths

    hey, i would really appreciate some help solving for x when: sin2x=cosx Use the identity sin 2A = 2sinAcosA so: sin 2x = cos x 2sinxcosx - cosx = 0 cosx(2sinx - 1)=0 cosx = 0 or 2sinx=1, yielding sinx=1/2 from cosx=0 and by looking at the cosine graph, we

    asked on July 17, 2007
  93. Econ T/F

    yes, its a true or false question is this a true or false question? Suppose that after a price change, the income effect is zero, but the substitution effect is not. For such a good, the quantity demanded is directly related to its price. oh well I think

    asked on March 1, 2007
  94. Econ T/F

    If a consumer is in equilibrium and all prices and her income increase by 25%, she will consume less of those goods that she considers inferior. if false, explain why. Take a shot. What does your economic reasoning tell you? Hint. If all prices and income

    asked on February 28, 2007
  95. math

    hi i would really appreciate some help solving this question simultaneously: Find A and B such that x-11/(x+3)(2x-1)= A/x+3 + B/2x-1 Multiply both sides by (x+3)(2x-1) to get rid of the fractions. We end up with this: (x-11) = A(2x-1) + B(x+3) You can

    asked on January 27, 2007
  96. math

    I need help differentiating this question: 3e^-4x that's three e to the power of negative 4x. when you differentiate, you get: -12e^-4x thanks, but how come it's not -12e^-4x-1, or do i just not minus a one when the power is a co-efficient? Remember, the

    asked on January 25, 2007
  97. Math

    Write a real world context for five to three

    asked on March 24, 2017
  98. Math

    Suppose the ice cream shop offers 9 different flavours, and we share 5 scoops. How many ways of ordering are there if All different any combination two scoops of one flavour, two scoops of 2nd, and one of third first one, i did 9! / 5!? second one and

    asked on November 13, 2016
  99. Physic

    A quarterback (QB) is running at 3.2 m/s at an angle of 25 degrees with x axis as shown in the sketch. At the moment he's at the origin (x = y = 0) he throws the football to a receiver which is stationary located at the coordinates x = 10 meter, y = 6

    asked on September 24, 2015
  100. physic

    A projectile is launched from the ground at 34.8 m/s at an angle of 44.5 degrees above the horizontal. How long, in seconds, does it take such that its angle of trajectory (it's velocity vector) is 20.6 degrees below the horizontal?

    asked on September 24, 2015

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