# Questions Asked onApril 8, 2017

1. ## More Chem

Consider the combustion of propane. Delta H is -2221 kJ. Assume all heat is from combustion of propane. What mass of propane must be burned in order to furnish this amount of energy assuming the heat transfer process is 60% efficient.

2. ## Math (Help please!)

The points plotted on the coordinate plane below are three vertices of a rectangle. ht tp : //imgur dotcom /a/eix1I What are the coordinates of the fourth vertex of the rectangle? (Remove the word "Dot", and put a "." in it's place to access the link, and

3. ## math

The maturity value of a \$28,000, 6%, 60-day interest-bearing note on August 6 is

4. ## Math

A person walks on the building.He slips 1m for every 5m he climbs. If the building is 53m high and he takes 5 seconds to climb 1m. Find the total time taken by him to get on the top of the building.

5. ## Chem

A 30 g sample of water at 280 K is mixed with 50 g of water at 330 K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.

6. ## CHEMISTRY

How many liters of chlorine gas at 25C and 0.950 atm can be produced by the reaction of 24.0 g of MnO2 with hydrochloric acid? The products include manganese (II) Chloride, water, and chlorine.

7. ## Physics

A boat travels at 15 m/s in a direction 45° east of north. The boat then turns and travels at 18 m/s in a direction 5° north of east. What is the magnitude of the boat’s resultant velocity? Round your answer to the nearest whole number. What is the

8. ## Alabama

gaseous butane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water. Suppose 38.9 g of butane is mixed with 35. g of oxygen. Calculate the maximum mass of water that could be produced by the chemical reaction. Round your

9. ## physics

Two dimensions. In the figure, three point particles are fixed in place in an xy plane. Particle A has mass mA = 4 g, particle B has mass 2.00mA, and particle C has mass 3.00mA. A fourth particle D, with mass 4.00mA, is to be placed near the other three

10. ## History

Which is one way the Vietnam War differed from other United States military involvements? A. The decade following the war was economically prosperous. B. There were higher number of American military casualties C. The sole focus of the war was to contain

11. ## Algebra

solve the equation by completing the square. round to the nearest tenth. x^2+8x=10 A. 1.1, 9.1 B. 1.1, -9.1 C. -1.1, 9.1 D. -1.1,-9.1 my answer is A is that correct

12. ## science

In which temperature of water did the food coloring diffuse faster?Using your knowledge of the motion of molecules, explain the result

asked by Young Trippy Lil G
13. ## Physics

Calculate the distance between the two proton such that the electrical repulsive force between them is equal to the weight of either

14. ## Math

How do you put 0.125,0.1,and 0.12 from least to greatest?

15. ## Algebra

solve the equation by completing the square. round to the nearest tenth. x^2+8x=10 A. 1.1, 9.1 B. 1.1, -9.1 C. -1.1, 9.1 D. -1.1,-9.1 my answer is A is that correct

16. ## physics

A swimmer sets off from one bank. The velocity of the swimmer relative to the water is 1.2 m / s at 45° to the river banks, as shown in Fig. 1.1. In the space below, draw a scale diagram to determine the resultant velocity of the swimmer relative to the

17. ## Algebra 2

Given the expression 5a^2b – 13ab + 7a^3 – 4b, do the following as instructed below: Put it in decending order. I got 7a^3+5a^2b-4b-13ab. Is it correct? If not please correct me.

asked by Marcus Peerbocus
18. ## Chemistry Heat

4Fe + 3O2 ---> 2Fe2O3 Delta H -1652 kJ How much heat is released when 10 g Fe and 2 g O2 are reacted.

19. ## Physics

A boat travels at 15 m/s in a direction 45° east of north. The boat then turns and travels at 18 m/s in a direction 5° north of east. What is the magnitude of the boat’s resultant velocity? Round your answer to the nearest whole number. What is the

20. ## math

Jungle Warehouse signed a 9-month simple discount note with a face value of \$5,600. Find the proceeds if the discount rate is 13%

21. ## Science

What is the mechanical advantage of a machine that used 600N to overcome a load of 1200

22. ## Program Design and Developmen

Design a class named TextBook that is a child class of Book. Include a new data field for the grade level of the book and get and set methods for the new field. Provide the pseudocode for the TextBook class Very basic pseudo code is what we're dealing

23. ## Chemistry

The reaction Fe + Br2 ---> FeBr2 Delta H = -249.8kJ Calculate delta H when 10.0 g of FeBr2 is formed.

24. ## Chemistry

So Ag+ + Cl- ---> AgCl and delta H is -65.5 kJ. I'm supposed to calculate delta H when one mole of AgCl dissolved in water, so 1 mol AgCl *(65.5 kJ/1mol Agcl) right? But the answer is 65.5 kJ, and why is it positive, not negative, is my question.

25. ## math

Five years ago, A was three times as old as B and ten years later, A shall be twice as old as B. What are the present ages of A and B (in years).

26. ## Maths

Construct a quadrilateral ABCD such that /AB /=4cm, /BC /,=5cm, /AD /=3.5cm and CAB=30°.measure /AB/

27. ## statistics

A new process is started and the sum of the sample standard deviation for 20 subgroups, of size 8, is 750; Compute, to 3 decimal places, the process standard deviation, σ0:

28. ## Math

An atom of gold has a mass of 3.25x10^-22 grams.What is the mass of 8000atoms?Express in scientific notation.

29. ## Math

A person walks on the building. He slips 1m for every 5m he climbs. If the building is 53m high and he takes 5 seconds to climb 1m . Find the total time taken by him to get on the top of the building . Please- solve this problem using integers.

30. ## math

For each of the following examples: i) Express the negation of the statement using propositional notation, simplifying as much as possible, and ii) Express the statement (and its negation) in words, for the provided propositional functions. (a) ∀x, (p(x)

31. ## Math

A person walks on the building.He slips 1m for every 5m he climbs. If the building is 53m high and he takes 5 seconds to climb 1m. Find the total time taken by him to get on the top of the building.

32. ## Chemistry

An electron initially in the n = 2 energy level in a hydrogen atom absorbs a photon of light with a frequency of 6.167 x 1014 s-1. Calculate the new energy level the electron will occupy. I am not sure how to being.

33. ## Math

A person walks on the building.He slips 1m for every 5m he climbs. If the building is 53m high and he takes 5 seconds to climb 1m. Find the total time taken by him to get on the top of the building.

34. ## Physics

A river is flowing at 3mps.A man can swim in still water at a speed of 6mps.The angle at which the bank at which the swimmer should start ,so that he may cross the river along the shortest distance is?

35. ## Maths

Find the length of an arc of a circle of radius 5.6cm which subtends an angle of 60°at the centre of the circle of the circle take pie 22 divided by 7

36. ## Math

In the year 1997, the surface elevation of Lake Powell was 3887 feet above sea level. In the year 2001, the surface elevation of Lake Powell was 3577.4 feet above sea level. The surface elevation of Lake Powell is at a rate of

37. ## Science

Since no one answered, and I really need help: So I am doing this science experiment about light. I chose to do one where you put a pencil in a glass of water and the light makes it look like it's bending. There is a chart of measurements that you need to

38. ## Social Studies

what religious, economic, and political events led to the development of western Europe?

39. ## ORGANIC CHEM QUESTION

I can't figure out how to draw the structure of beta-valerolactone. Since it's beta I thought it would have a four mem-ring but when I do this I keep getting it wrong. It says the 5 carbons are supposed to be arranged in a linear chain, help please!

40. ## basic mathematic

if Mr Dhaka earn N\$ x in a week and spend N\$ y, what part of his weekly salary did he save?

41. ## Maths

Find the length of an arc of a circle of radius 5.6cm which subtends an angle of 60°at the centre of the circle take pie 22 \7

42. ## Maths

Factorize completely 16y³+16y² +4y

43. ## Science

Since no one answered, and I really need help: So I am doing this science experiment about light. I chose to do one where you put a pencil in a glass of water and the light makes it look like it's bending. There is a chart of measurements that you need to

44. ## Math

If 1/6 cup of icing covers 2/3 of a cake, how much icing is needed to cover the entire cake? A. 1/9 B. 1/6 C. 1/4 D. 1/18

45. ## Chrmistry

What is the percentage recovery if 0.98g of copper is left when reacting 0.5g of copper sulphate with excess zinc?

46. ## math

Let f(x) be a twice differentiable function (i.e. f(x), f′(x) and f′′(x) are defined for all x), and let a ∈ R (a is a real number). If f′(a) = 0 and f′′(a) > 0, then a is a strict local minimum of f. (a) Express the second sentence in

47. ## Math

Adeline and Mandy had some money in the ratio 3:7. After Adeline receive \$92 and Mandy receive \$40, both girls had an equal amount money. How much money did they have at first?

48. ## Deduction

Hello, Struggling to get my head around this. So we have this statement. ----------------------------------- If it rains on Monday then mark will carry an umbrella on Monday. It does not rain on Monday. You deduce: Mark does not carry an umbrella on

49. ## ENGLISH

In about (500 words)write a composition ending with "when i woke up i realised that it was only a dream"

50. ## Proof by contradiction

Prove that there exists no positive real number such that: 4x^2+1/4x

51. ## physic

the sunlight rae about 46 degree in a tree if the hight of trre is 8 what is length of the shadow

52. ## physics

from newton's second law of motion derive the formulae F=ma

53. ## chemistry

It takes 445.76 J of heat to increase the temperature of a 50.0 g piece of metal from 20.0 °C to 65.0 °C. What is the specific heat capacity of the metal (assuming the phase doesn\'t change)? Also please show work

54. ## Program Design and Development

Design a class called SimpleCalculator using psudoecode that contains public methods named add(), subtract(). Each of the methods accepts two numeric arguments and returns a number that represents the result of the appropriate arithmetic operation. Design

55. ## chemistry

what is 1.79 x 10^-20 in kJ/mol?

56. ## trigonometry

If cos x = 4/5, 0° x 90°, find the value of (1 + tan x)/(1 - tan x)

57. ## Algebra 2

Let f(x) = 3x^2 – x + 2 and g(x) = 5x^2 – 1. Find f(g(x)). Show each step of your work. I got 75x^4 -35x +6 If that is wrong can you correct me. Thank you!