# Questions Asked onJuly 15, 2016

1. ## chemistry

What volume of 0.10 M NaOH can be prepared from 250. mL of 0.30 M NaOH? A) 0.075 L B) 0.25 L C) 0.75 L D) 0.083 L E) 750 L

2. ## PHYSICS--

The objective and eyepiece of an astronomical telescope are double convex lenses with refractive index 1.5. When the telescope is adjusted to infinity, the separation between the two lenses is 16 cm. If the space between the lenses is now filled with water

3. ## MATH

Carl walked 4 m west and 5 m south. Calculate how far he is from his starting point?

4. ## Chemistry

How many grams of S8 are needed to produce 225 grams of sulfur hexafluoride? I know to begin with a balanced equation S8+24F2(arrow)8SF6. I've spent a couple of hours trying to figure out the next step, but I'm stuck. Thanks for any pointers!

5. ## Chemistry (DUE TONIGHT)

A possible reaction for converting methanol to ethanol is: CO(g) + 2H2(g) + CH3OH(g) -----> C2H5OH(g) + H2O(g) I completed parts A-C correctly, and found the following info: delta H = -165.6 kJ delta S = -227.4 J/K delta G = -97.9 kJ The next question is

6. ## Precalc

Rhombus ABCD, with side length 6, is rolled to form a cylinder of volume 6 by taping side AB to side DC. What is sin(angle ABC)?

7. ## Math

A tank, when one-fifth full, holds 75 litres of water. How many litres will it hold when full?

8. ## Maths

On a certain examination the student must answer 8 out of 12 questions including exactly 5 of the first six. In how many ways may he write the examination.?

9. ## Maths

A ladder leaning against a wall makes an angle of 60 degree with the horizontal If the foot of the ladder is 2.5 m away from the wall , find the length of the ladder.

10. ## science

A cricket ball of mass 0.4 kg moving with a velocity of 72 km/h is brought to rest by a player. Find the magnitude of the average force exerted by the player? we have, F= m x a to find acceleration we want either dist(s) or time(t) it is not given how to

11. ## Maths

Mr Sanderson makes some cookies for a festival day. She gave 1/4 of the cookies to her sister and 1/3 of the remainder to a neighbour. If she had 120 cookies left, how many cookies did she make in the beginning? Linda spent 1/4 of her money on books, 1/3

12. ## calc

a wrench is rotated with torque of magnitude 175 N (M). the force is applied 45 cm from the pivot point at an angle of 48 degrees. what is the magnitude of the force, to one decimal place?

13. ## physics

a 1000kg car is travelling with a speed of 33.3m/s2 when the driver saw an intersection 30m away. how much force is needed to stop the car right away?

14. ## physics

vector a has a negative x component 3 units in length and positive y component 2 units in length. What vector B when added to vector A gives a resultant vector with no x component and a negative y component 4 units in length

15. ## Geometry

An architectural drawing lists the scale as 1/4" = 1'. If a bedroom measures 6.75" by 4.5" on the drawing, how large is the bedroom?

16. ## calculus

A door is opened by pushing inward explain in terms of torque why this is most easily accomplished when pushing at right angles to the door as far as possible from the hinge side of the door?

17. ## Physics

Research on the physics of living systems.Give two examples to show how physics

18. ## Calculus1

The radius of a sector of a circle is increasing at a rate of 3 cm/sec while the area is decreasing at a rate of 1 cm2/sec. At what rate is the angle of the sector changing when the area is 20 cm2 and the radius os 5cm?

19. ## Chemistry

Hi, I've been working for nearly 2 hrs on this problem, but I'm stuck on the next step. Thanks for any pointers in the right direction. My problem is: How many grams of S8 are needed to produce 225 grams of sulfur hexafluoride? I was given this formula:

20. ## statistic

Three Children – A couple are planning to have 3 children. What is the sample space for three children? (What are all the possible outcomes for three children? Assume that boys and girls are equally likely, so that the sample events are equally likely.

21. ## math 101

assume that a set of test scores is normally distributes with a mean of 120 and a standard deviation of 25. use the 68-95-99.7 rule to find the percentage of scores greater tha 145

22. ## math

in quadrilateral kite two equal angles are 70degrees and 80 degrees each . find other two angles.

Solve the following by using the present value formula. Compound Amount- \$675 Term of Investment-15 months Nominal Rate (%)- 2.7 Interest Compounded quarterly Present Value ___________? Compound Interest _________?

Solve the following by using the present value formula. Compound Amount- \$700 Time Period(years)-8 years Nominal Rate (%)- 1.5 Interest Compounded monthly Compound Amount___________? Compound Interest _________?

25. ## chemisrty

Which one of the following compounds will NOT be soluble in water? A) NaOH B) Na2S C) K2SO4 D) LiNO3 E) PbO

26. ## Data Analysis with spreadsheets with Lab

Using the IF function. You have a list of contracts and due dates for annual maintenance fees. You wish to determine when you have a contract due in the next 45 days and provide a note that warns you that the payment is due".

27. ## chemistry

Calculate the no. Of moles of co2 is liberated gives50gm of caco3 reacts with 7.3gm of dil.hcl

29. ## science

a satellite is moving in 36000km if it takes 24 hour what will be the speed?

30. ## Math linear equations

5(2x-3)-3(3x-7)=5

31. ## maths

from a point P on a level ground and directly west of a pole,the angle of elevation from the top of the pole is 045 and from point Q east of the pole the angle of elevation of the pole the angle of elevation of the top of the pole is 068 if /PQ/ is

32. ## Math

Hello, can I please have help on how to find the area of a hexagon by knowing the apothem is 4 and the square root of 3? Thank you!

33. ## physics

33. A rope of mass M and length L is being rotated about one end in a gravity free space. A pulse is being created at one of the ends. The angle through which rope will be rotated in the time when pulse reaches the opposite end of rope for first time and

34. ## Physics

A bullet is fired horizontally from the top of a cliff with a speed of 30m/s.assuming that there is no air resistance, what will be its speed 3sec later?

35. ## Math

In Mary class 9 children own cats, 7 children own dogs and own birds.What is the ratio of bird owners and cat owners in Marry class?

36. ## physics

A rope of mass M and length L is being rotated about one end in a gravity free space. A pulse is being created at one of the ends. The angle through which rope will be rotated in the time when pulse reaches the opposite end of rope for first time and for

37. ## Physics

Research on the physics of living systems.Give two examples to show how physics helps to understand the concepts of evolution, biological systems of living organisms.

39. ## science

which physical quantity is given under the area of velocity time graph?

40. ## Maths

how many words consisting of 5 consonants and 3 vowels be formed out of 7 consonants and 5 vowels

41. ## chemistry practical

Why? alkaline solution didn't puppet out.

42. ## Math

A big can contains some milk pots of 2 liters, 4 liters, 5 liters capacity are to be filled whole number of time from each. What can be the least capacity of the big can.

43. ## precalc

Points A, B, and C are on the circumference of a circle with radius 2 such that angle BAC = 45 degrees and angle ACB = 60 degrees. Find the area of triangle ABC.

44. ## Chemistry

What volume of nitric dioxied at s.t.p from the below equestion N2+O2=2NO

45. ## calc

a parallelogram has an area of 150 cm^2. the side lengths are 80 cm and 40 cm what are the measures of the angles

46. ## General Physics

A 2.3 kg block is initially at rest on a horizontal frictionless surface when a horizontal force in the positive direction of an x axis is applied to the block. The force is given by F with arrow(x) = (2.6 − x^2) N, where x is in meters and the initial

47. ## Algebra 2

how can u tell if a equation is liner?

48. ## Math

There are 7girls in front of amarda and 3girls after her

49. ## Math

There are 7girls in front of amarda and 3girls after her

50. ## Johnson

A man throws an object down an elevator shaft towards a downward moving elevator, which is 22m below the man when he throws the object with an initial speed of 6.50 m/s. how long after the object is thrown does it hit the target if the elevator is moving

51. ## chemistry

Discuss the structure of bonding in copper acetate?????

52. ## Physics

Two bodies begin to fall freely from the same height but 2nd one falls T seconds ater 1st.The time(after which the 1st body begin to fall) when the diatance between them is L is: Options 1.T/2 2.T/2+L/gT 3.L/gT 4.T+2L/gT I am not understanding how to find

53. ## science

what is the equation for velocity?

54. ## Health

examples of situations displaing positive stress.

55. ## Physics

Capacitor X is charged to a potential difference 68 V by a battery. It is disconnected from the battery and then connected in parallel to an uncharged 12 µF capacitor. A voltage of 20 V is measured across the parallel combination. Calculate the

56. ## Math

Given that x and y are integers, then for the equation x+y= 2xy how many solutions are there?

57. ## calc

Would k(a-b) x (a x c) -a +( b x c) be a scaler, vector or meaningless? (these are all vectors besides k)?

58. ## math ratios

mark is growing tomatoes in his greenhouse and needs to fill them with fertiliser. The ratio of concentrated fertiliser to water is 1:6. If mark needs 21 litres of diluted fertiliser, how much concentrated fertiliser and water will he need?

59. ## maths

A(–4, 3), B(3, 7), C(0, –1) and D(–7, –5) are the vertices of a parallelogram on the Cartesian plane. Determine the coordinates of the point where the diagonals of ABCD intersect.

60. ## Physics

Determine the magnitude of current I3. Let the voltage of the bottom battery VB =13.0 volts and r= 1.0 Ω.