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

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?

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

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

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.

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?

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

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

9. Physics

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

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

11. English

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

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

13. Chemistry

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

Base number

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).

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

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.

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

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

20. SCI/256 PEOPLE, SCIENCE, AND THE ENVIRONMENT

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

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)

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

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

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

25. Physics

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

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)

27. Physics

Derive the coefficient of surface tension for water

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?

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

30. Maths

324x=70 find x as a base mumber

31. Maths

342x=70 find x

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).

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?

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].

35. Physics

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

36. Physics

Derive the coefficient of surface tension of mercury

37. Physics

What is viscosity

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

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.

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

41. physics

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

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

43. Physics

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

44. English

What figure of speech is "Emmanuel writes fast"

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.

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.

47. Maths

2x+4y=16 Xy=0

48. Maths

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

49. Literature

What are the various definitions of literature?

50. maths

what are real numbers

51. Life orientation

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

52. physics

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

53. chemistry

Properties of light energy

54. physical

violence in sports

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