Most popular questions and responses by Lissa
  1. physics

    Four identical masses of 2.7 kg each are located at the corners of a square with 1.4 m sides. What is the net force on any one of the masses? F=((G)(m1)(m2))/r^2 I don't understand why im not getting it right... i need help please!!

    asked on December 19, 2010
  2. satistics

    Among a random sample of 500 college students, the mean number of hours worked per week at non-college related jobs is 14.6. This mean lies 0.4 standard deviations below the mean of the sampling distribution. If a second sample of 500 students is selected,

    asked on September 15, 2015
  3. Statistics

    A college’s data about the incoming freshmen indicates that the mean of their high school GPAs was 3.4, with a standard deviation of 0.35; the distribution was roughly mound-shaped and only slightly skewed. The students are randomly assigned to freshman

    asked on January 25, 2013
  4. physics

    A 70 kg man weighs 686 N on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 14% of his body weight? i don't even know where to start with this question... i need help!

    asked on December 19, 2010
  5. L.O

    What is meant by 'Designated subjects'

    asked on February 23, 2016
  6. physics

    Two masses are suspended from a pulley as shown in the figure below (the Atwood machine). The pulley itself has a mass of 0.20 kg, a radius of 0.15 m, and a constant torque of 0.35 m·N due to the friction between the rotating pulley and its axle. What is

    asked on January 9, 2011
  7. physics help pleeeeease!!

    A monatomic ideal gas is compressed adiabatically from a pressure of 1.09 105 Pa and volume of 250 L to a volume of 39.0 L. (a) What is the new pressure of the gas? (b) How much work is done on the gas?

    asked on February 16, 2011
  8. Chemistry

    I am having great difficulty with the following questions. Any and all help will be greatly appreciated. I have read the chapter and even looked up online tutorials. I still do not understand it. 2 NO (G) + O2 (G) > 2 NO2 (G) Write the equilibrium constant

    asked on September 22, 2014
  9. Algerbra

    The difference between two numbers is 77. Five times the smaller is equal to 7 more than the larger. What are the numbers?

    asked on October 28, 2015
  10. Satistics

    Jody checked the temperature 12 times on Monday, and the last digit of the temperature was odd six times more than it was even. On Tuesday, she checked it 18 times and the last digit was odd eight times more than it was even. Determine which series is

    asked on September 15, 2015
  11. Chemistry

    My head is spinning from this chapter! I've done most of the questions by myself but I have no idea what formulas I should use for these last two. Can you walk me through them so I can understand what I need to do? 1. What volume of 5.0 M HNO3 is required

    asked on September 26, 2014
  12. physics

    A mass m1 = 18.7 kg on a frictionless ramp is attached to a light string. The string passes over a frictionless pulley and is attached to a hanging mass m2. The ramp is at an angle of θ = 23.7° above the horizontal. m1 moves up the ramp uniformly (at

    asked on March 2, 2012
  13. Pre-cal

    A ball is thrown vertically upward with an initial velocity of 96 feet per second. The distance s (in feet) of the ball from the ground after t seconds is s(t)=96t-16t^2 projectile formula: s(t)=1/2gt^2+v+t+h g=acceleration due to gravity. V= the initial

    asked on December 5, 2017
  14. physics

    A monkey is sitting on a wood plate attached to a rope whose other end is passed over a tree branch, as shown in the figure. The monkey holds the rope and tries to pull it down. The combined mass of the monkey and the wood plate is 117 kg. a) What is the

    asked on March 2, 2012
  15. physics

    A crate of oranges slides down an inclined plane without friction. If it is released from rest and reaches a speed of 4.883 m/s after sliding a distance of 2.01 m, what is the angle of inclination of the plane with respect to the horizontal? Please note:

    asked on March 2, 2012
  16. chemistry

    In 1774 Joseph Priestly conducted one of his most famous experiments which lead to a method for the preparation of oxygen. The experiment involved heating a sample of mercury II oxide with a large lens. The equation for this reaction is shown below:

    asked on November 2, 2011
  17. Geometry

    find the measure of each angle of an isosceles trapezoid if two of the angles has measures in the ratio of 2:3.

    asked on September 21, 2011
  18. physics help pleease!!

    A rope goes over a circular pulley with a radius of 6.3 cm. If the pulley makes four revolutions without the rope slipping, what length of rope passes over the pulley? how can i find distance if the only variable given is radius and revolutions?

    asked on January 5, 2011
  19. physics

    A sky diver of mass 80.9 kg (including outfit and equipment) floats down suspended from her parachute, having reached terminal speed. The drag coefficient is 0.575, and the area of her parachute is 20.27 m2. The density of air is 1.14 kg/m3. What is the

    asked on March 2, 2012
  20. physics

    is the following statements true or false + write a correct version of each false sentance below: 1. usually, the cooler a liquid or gas is, the denser it is. 2. if you only want a small volume of hot water, you should place the immersion heater near the

    asked on October 29, 2011
  21. Algebra

    Factor the polynomial completely x^3+27

    asked on October 12, 2011
  22. Math

    LCD 1.1/2 4/x^2

    asked on June 6, 2017
  23. Analyzing Financial Statements

    EAT AT MY RESTAURANT-CASH FLOW With this case, we review the cash flow of several restaurant companies. The restaurant companies reviewed and the year-end dates are as follows: 1. Yum Brands, Inc. (December 30, 2008; December 30, 2007) "Through the five

    asked on April 5, 2012
  24. physics

    A block of mass m1 = 21.3 kg is at rest on a plane inclined by θ = 30.00 degrees. It is connected via a rope and pulley system to another mass m2 = 24.5 kg, as shown. The coefficients of static and kinetic friction between block 1 and the inclined plane

    asked on March 2, 2012
  25. maths

    how do you simplify surds?

    asked on November 20, 2011
  26. physics

    what is the temperature of a bunsen burner?

    asked on November 13, 2011
  27. Accounting

    Hawkeye Electric Company engaged in the following transactions during July. Journalize the preceding transactions on the books of Hawkeye Electric Company using the perpetual system of inventory. July 2 – Purchased inventory for cash, $800 July 5 –

    asked on November 23, 2013
  28. Phsyics

    A 75 kg student stands at the top of a 30 m tall building. How much gravitational potential energy does this student possess?

    asked on May 24, 2012
  29. physics

    many vacuum flasks have steel walls instead of glass. how would this effect how gfast some hot coffee cools

    asked on November 22, 2011
  30. physics

    1) A fask has the following features; a plastic stopper glass walls with silver coating on both sides vacuume between walls plasic spacer Which features of the flask reduce energy transfer by: a) radiation b) conduction c) convection 2) Many vacuume flasks

    asked on November 17, 2011
  31. physics

    water is being heated in a large beaker. there is a bunsen under it. if a second bunsen was added bellow the largest beaker, what affect would this have? why? (refer to particle behaviour)

    asked on November 8, 2011
  32. physics

    3 beakers are being heated (small, medium and large). consider the first two. both beakers are filled with water and heated for 10 minutes. after about 3 minutes the water in the small beaker the water in the small beaker is boiling; after 8 minutes the

    asked on November 4, 2011
  33. biology

    find a drug scandal within a sportig event and write some notes about it.

    asked on November 1, 2011
  34. P.E

    i need names of famous females who have a careers in sport and their: age, where they live, how many brothers and sisters they have, profession and what they do in their free time.

    asked on October 30, 2011
  35. maths

    A swimming pool has two identical sides in the shape of a trapezium. All other sides are rectangular. The length of the pool is 12m. The width of the pool is 4m. The depth of the pool is 2.1m at the deep end and 1.1m at the shallow end. Rafa fills the pool

    asked on October 28, 2011
  36. Geometry

    Use parallelogram ABCD to answer the following. Diagonals BD and AC bisect at O. 1.measurement of angle BAD = 3y - 5 find angle BCD 2. AC = 12.8 cm find OC

    asked on September 21, 2011
  37. physics

    The mass of a certain neutron star is 2.0 x 1030 kg and its radius is 6,000 m (6 km). What is the acceleration of gravity at the surface of this condensed, burned out star?

    asked on March 12, 2011
  38. Science

    Electromagnetics in motors are used to cause __________.

    asked on May 19, 2010
  39. Algebra

    Today I did a practice SAT problem. If the function ƒ is defined by ƒ(x) = 2x + 3, and if ƒ(a) = 11, what is the value of a? A. 4 B. 7 C. 11 D. 17 E. 25 This is the correct answer and the explanation Here's Why: If the function ƒ is defined by ƒ(x) =

    asked on June 26, 2009
  40. math

    a dog eats 3/4 of dog food for each meal. if he has 7 2/4lbs of food. how many meals can he feed his dog.

    asked on September 14, 2016
  41. math

    It takes 2/6 of a hour to run one mile. how many miles can you run in 4 hours

    asked on September 14, 2016
  42. math

    Mike and Sandra leave the seashore at the same time. Mike drives northward at a rate of 55mph, while Sandra drives west at 65mph. Find how far apart they are after 3 hours to the nearest mile.

    asked on February 13, 2016
  43. physics

    many vacuum flasks have steel walls instead of glass. how would this effect how fast some hot coffee cools?

    asked on November 22, 2011
  44. physics

    how does a dessert fox's large ears help it keep cool?

    asked on November 19, 2011
  45. maths

    what are all the mathethematical terms you need to include in your answer for a question based on circle theorums?

    asked on October 29, 2011
  46. tourism

    write 4 ways that this decline in the tourist industry could affect the country.

    asked on February 14, 2014
  47. French

    I'm having difficulty with these two sentences. There is something wrong with them and I can't figure out what it is. I'm pretty sure it have to do with pluralization but I don't know what I'm doing wrong. Ils avaient un job. Ils travaillaient dans un

    asked on June 11, 2012
  48. physics

    explain why air moving over an object can increase its rate of cooling.

    asked on November 22, 2011
  49. physics

    what temperature is bose- einstien condensate?

    asked on November 15, 2011
  50. biology

    how reliable are tests for drugs in sport?

    asked on November 1, 2011
  51. history

    who was Naqia queen of Assyria?

    asked on October 29, 2011
  52. history

    what treatments (natrual) would you find at the Asclepion?

    asked on October 28, 2011
  53. history

    what did a diet at the asclepion consist of?

    asked on October 28, 2011

    what is the equation for bose einstien condensate?

    asked on October 27, 2011
  55. math


    asked on November 9, 2008
  56. italian

    how to say 6:00am in italian

    asked on April 1, 2008
  1. Math

    Thank you! I didn't rea;;y understand it, but this helped

    posted on June 7, 2017
  2. Chemistry

    Can DrBob222 please explain why it is not a pure sample? Thank you in advance.

    posted on November 2, 2015
  3. Chemistry

    Okay, I think I have all but the last two figured out but those last two are defeating me. I just don't know what to plug in where. For instance, for the next to last one, I think that I am supposed to add the [NO2] and the [O2] together and then divide by

    posted on September 23, 2014
  4. Creating a Budget -HSM 220

    Just cant think of this or get it together right now my mind is so far off. I just need help.

    posted on October 13, 2013
  5. Social Studies

    Which of the following is true of the Industrial Workers of the World (I.W.W.)?

    posted on September 16, 2012
  6. French

    These are the instructions: Quand ils étaient à l’université, certains étudiants avaient un job et travaillaient. D’autres ne travaillaient pas. Expliquez cela. And Here are the examples: Frédéric (non) Il n’avait pas de job. Il ne travaillait

    posted on June 11, 2012
  7. science

    To find out the pressure in this kind of situation simply follow the equation Pressure = height of the column x Density of the filled liquid So, Here Pressure= 15 cmx 13.6 g/cm^3 = 204 gm/cm^2

    posted on October 28, 2011
  8. math

    1 is greater than negative 1.

    posted on October 27, 2011
  9. Geometry

    thank you reiny

    posted on September 21, 2011
  10. Math

    the fraction is just 15/43 in simplest terms

    posted on January 9, 2011
  11. Math !!!!ASAP!!!!!

    you combine all common factors so 3x-53=61. then add 53 to both sides to get 3x=114. then divide both sides by 3 to get x=38 :)

    posted on January 5, 2011
  12. math

    you have to divide 6/7 by 1/7. to divide fractions you have to flip the second fraction and then multiply them so: 6/7 times 7/1= 42/7= 6 x=6 :)

    posted on January 5, 2011
  13. physics

    could try and explain more in depth? like wat does W stand for? his weight? and i don't really get how your solving it..

    posted on December 19, 2010