evans

Most popular questions and responses by evans
  1. physics

    A staging that weighs Wstaging supports a painter weighing 620 N. The reading on the left scale is 660 N and the reading on the right scale is 410 N. What is the weight of the staging? Answer in units of N

    asked on September 1, 2013
  2. Physics

    An object at 100 m/s accelerates at a rate of 120 m/s 2 . What will the velocity of this object be after 100 seconds?

    asked on June 5, 2019
  3. Physics

    Using the expression of pressure(p) of a gas=1/3pc^-2.where p=density and c^-2=mean square velocity, derive the relation of the kinetic energy of the gas to its temperature

    asked on April 2, 2018
  4. Chemistry

    a typical simple Infrared spectrophotometer which covers a wavelength range from 3 to 15um. Express it's range in (1). Wave number (2). Hertz

    asked on June 4, 2019
  5. Chemistry

    A 4g sugar cube(sucrose: C12H12O11) is dissolved in a 350ml teacup of 80 degree water. what will be the molality of the sugar solution.

    asked on May 10, 2018
  6. Physics

    A 2kg block rests at the edge of a platform that is 10m above ground level.The block launched horizontally from the edge of the platform with an initial speed of 3m/s. Air resistance is negligible.what is the time taken for the block to reach the ground?

    asked on January 30, 2019
  7. Math

    A platform and a building are on thesame plane. The angle of depression of the bottom(c) of the building from is 39degree. The angle of elevation of the top(o) of the building From the top of the platform is 56. Given that the distance between the foot of

    asked on February 20, 2016
  8. Physics

    A man starts with a velocity of 15m/s and moves with an acceleration of 2m/s^2.what distance does he cover in the fifth second? What distance does he cover in 10s

    asked on January 28, 2019
  9. Physics

    what is the critical angle for light passing from(n=1.54) to (n=1.33)

    asked on August 15, 2018
  10. Maths

    A platform and building are on thesame plane. The of angle of depression of the bottom(c) of the building from the top(a) of the platform is 39degree. The angle of elevation of the top(o)of the building from the top of the platform is 56. Given that the

    asked on February 20, 2016
  11. English

    English is the language of opportunity why bother to teach indigenous language

    asked on May 8, 2019
  12. Physics

    calculate the electric potential at a point P, a distance of 1m from either two charges of +10uC and -5uC which are 10cm apart. Calculate also the potential energy of a +2uC charge placed at a point,P

    asked on September 3, 2018
  13. Chemistry

    C2H5 O | || CH3--CH2--C--CH2--CH2--C--NH2 | CH3 What's the name of this organic structure

    asked on January 25, 2019
  14. Maths

    Base number

    asked on October 26, 2018
  15. Physics

    A camera with a telephoto lens of focal length 125mm takes a picture of a 1.8m tall woman standing 5.0m away. (1). What must be the distance between the film and the lens to get a properly focused picture? (2). What is the magnification of the image (3).

    asked on August 16, 2018
  16. Chemistry

    50 liters cylinder is filled with Ar gas to a pressure of 10130KPa at 30C. How many moles of At gas are in the cylinder

    asked on July 26, 2017
  17. Physics

    Determine the resolving power of a telescope,if the objective of a telescope has a diameter of 300mm.The mean wavelength of the light from Stars is 6*10^-7m.

    asked on August 16, 2018
  18. Physics

    A 5kg object travelling at 0.1m/s collides head on with 10kg object initially at rest. Determine the velocity of each object after the impact if the collision is elastic

    asked on April 22, 2018
  19. phy

    A very thin hollow conducting sphere has a radius of R=0.12 m. The center of the sphere is at S. A charge of q=7×10−6 C is present at point P which is located d=0.09 m from S. Assume that this charge stays at this position (thus it cannot move). We draw

    asked on March 25, 2013
  20. SCI/256 PEOPLE, SCIENCE, AND THE ENVIRONMENT

    What are some social, economic, aesthetic, and ethical issues involved in a current environmental controversy? Explain.

    asked on June 12, 2012
  21. Physics

    as observer travelling with a constant velocity of 20m/s passes close to a stationary source of sound and noticed that there is a change of frequency of 50Hz as he passes the source. What is the frequency of the source? (speed of sound in air=340m/s)

    asked on August 15, 2018
  22. Digital electronics and logic

    Determine the base/radix of the numbers in each case for the following operations to be correct: (i) 29 + 17 = 40 (ii) 7 + 6 = 15 (iii) 67 + 24 = 113

    asked on April 24, 2018
  23. math

    In the first quarter of a year, a company’s records showed that 68% of its sales employees missed no work and 76% of its sales employees made their sales quota for the quarter. Of the sales employees who missed no work, 87% made their sales quota for the

    asked on May 4, 2018
  24. Physics

    Pdf of a camera with telephoto lens of focal length 125 mm takes a picture of 1.8m tall woman standing 5.0m away. what must be the distance between the film and the lens to get a properly focused picture

    asked on October 14, 2018
  25. Physics

    An isotropic point source has an intensity of 300Cd. Calculate the amount of luminous flux emitted by the source.

    asked on August 16, 2018
  26. Physics

    A small omni directional source of noisy sound emits uniformly with a power of 40W.Determine the distance from the source for which the sound level is 90dB. Calculate also the intensity level at a point 100m from the source. (if there is no absorption)

    asked on August 15, 2018
  27. Physics

    Derive the coefficient of surface tension for water

    asked on May 6, 2018
  28. Physics

    A wire-wound resistor with a resistance of250ohm Will overheat if the power dissipated exceeds 10W.What is the maximum constant voltage V that can be applied across the terminals of this resistor?

    asked on October 24, 2017
  29. Physics

    Calculate the kinetic energy of a car of mass 1200kg moving at 1.8m/s The car engine is Switched Off calculate the height the could rise up a hill before coming to rest if there is no energy loss due to friction assume g= 10N/kg Into what form has the

    asked on April 20, 2016
  30. Maths

    324x=70 find x as a base mumber

    asked on October 26, 2018
  31. Maths

    342x=70 find x

    asked on October 26, 2018
  32. Physics

    A camera with a telephoto lens of focal length 125mm takes a picture of a 1.8m tall woman standing 5.0m away. (1). What must be the distance between the film and the lens to get a properly focused picture? (2). What is the magnification of the image (3).

    asked on August 22, 2018
  33. Chemistry

    The osmotic pressure of solution containing 4 g of the solute per litre of the solution is 0.41 atm at 27. What is the molecular weight of the solute?

    asked on August 13, 2018
  34. Chemistry

    What will be the osmotic pressure of a solution containing 3.42 g sugar in one litre of solution at 27 [ Mol. Wt of sugar =342 ], R= 0.082 litre-atm/mol.deg].

    asked on August 13, 2018
  35. Physics

    Please who can help me out. Derive the coefficient of surface tension for water

    asked on May 6, 2018
  36. Physics

    Derive the coefficient of surface tension of mercury

    asked on May 6, 2018
  37. Physics

    What is viscosity

    asked on March 18, 2018
  38. physics

    crude oil is contained in an iron cylindrical tank whose height is 6m and diameter of the base is 5m. at 0c, the level of crude oil is 20cm below the brim. at what temp will the oil start to over flow from the tank

    asked on June 19, 2016
  39. Math

    It was observed that the shadow of a vertical pole of 6 meters longer when the angle of elevation of the sun was 30° than when it was 60°.By means of a sketched diagram,calculate,correct to two decimal places,the height of the pole.

    asked on May 25, 2016
  40. English

    British: American ll : l l : l gramme:gram please help me i need three examples of the word listed above that is spelt in the British way and also in the American way

    asked on February 20, 2016
  41. physics

    Calulate the amount of substance in 120g of trioxocarbonate (iv)ion,co2

    asked on February 3, 2013
  42. Financial information for management

    ACCA Paper 1.2 Financial information for management Question 1 Preliminaries -Generating data (unit cost) for your version of the question -Using a scientific calculator,generate two 3-digit random numbers (hit the random number button twice {shift then

    asked on October 25, 2006
  43. Physics

    Someone please.... Derive the coefficient of surface tension for mercury

    asked on May 6, 2018
  44. English

    What figure of speech is "Emmanuel writes fast"

    asked on May 5, 2018
  45. Physics

    A uniform sphere of radius R=30cm is made of a material of density 5000kg/m3.find the moment of inertia about an axis through the center of the sphere.

    asked on April 23, 2018
  46. Physics

    Calculate the kinetic energy stored in a helicopter rotor consisting of four blades each 8m long and with a mass of 50kg if the tips of the blade are moving at 200m/s.

    asked on April 23, 2018
  47. Maths

    2x+4y=16 Xy=0

    asked on April 20, 2018
  48. Maths

    solve y^2-4y=13 using completing the square method

    asked on April 17, 2018
  49. Literature

    What are the various definitions of literature?

    asked on September 14, 2017
  50. maths

    what are real numbers

    asked on September 8, 2014
  51. Life orientation

    5 ways in which the human or enviromental problem impacts on the community

    asked on April 25, 2013
  52. physics

    Calulate the amount of substance io 120g of trioxocarbonate (iv)ion,co2

    asked on February 3, 2013
  53. chemistry

    Properties of light energy

    asked on December 30, 2010
  54. physical

    violence in sports

    asked on December 30, 2010
  1. Physics

    Thanks sir... I will stil try it out but what's ur own final answer to this?

    posted on June 5, 2019
  2. Physics

    Thanks sir... got ans=121 But my text is saying ans=112

    posted on June 5, 2019
  3. Analytical chemistry

    That is : 3×10^8/2.2×10^-3 = 1.36×10^11 Hope am correct

    posted on June 4, 2019
  4. Maths

    You are finding 'x as a base number

    posted on October 26, 2018
  5. Physics

    Any one pls

    posted on August 15, 2018
  6. Maths

    58-47

    posted on June 4, 2018
  7. riddle

    Air

    posted on April 19, 2017
  8. life orientation

    It will result to the haters of another country

    posted on April 29, 2016
  9. Microeconomics

    i wish to have any script/book covering microeconomics

    posted on July 31, 2008