# Questions Asked onMarch 25, 2017

1. ## Chemistry

Given ∆Hºrxn = -1670 kJ/mol for 2Al(s) + (3/2)O2(g) --> Al2O3(s), determine ∆Hº for the reaction 2Al2O3(s) --> 4Al(s) + 3O2(g). I flipped Al(s) + (3/2)O2(g) --> Al2O3(s) to Al2O3(s) --> A(g) + (3/2)O2(s) and multiplied the molar values by 2. I ended

2. ## physics

A block of mass m = 3.53 kg is attached to a spring which is resting on a horizontal frictionless table. The block is pushed into the spring, compressing it by 5.00 m, and is then released from rest. The spring begins to push the block back toward the

3. ## physics

A 30 ohm resistor is connected in parallel with a variable resistance R. The parallel combination is then connected in series with a 6 ohm resistor and connected across a 120 V source. Find the minimum value of R if the power taken by R is equal to the

4. ## physics

At a playground, a 20-kg child sits on a spinning merry-go-round, as shown from above in (Figure 1) . The merry-go-round completes one revolution every 6.2 s, and the child sits at a radius of r=1.8m. a. What is the force of static friction acting on the

5. ## Maths

The 90 men that visited a restaurant take one of either pounded yam,rice and amala.10 take pounded yam and rice,19 take rice and amala and 29 take pounded yam and amala.x men take all the three menu.2x men each take only one food item.how many take all

6. ## Chemistry

Given H2(g) + (1/2)O2(g) --> H2O, ∆Hº = -286 kJ/mol, determine the standard enthalpy change for the reaction 2H2O(l) --> 2H2(g) + O2(g). Just checking... should end up with ∆Hº = 572 kJ/mol right??

7. ## Physics

A 10 kg mass is hung from 2 light, inextensible strings such that the vertical string is attached to the top of the block at an angle 60 degree and the other string is attached straight horizontally to the adjacent side of the mass. How do we solve the

8. ## Language Arts

7. In which of these sentences is the meaning of the word unethical best expressed? A: Sarah felt bad seeing the child cry, so she bought him a candy bar B: Brady didn't have time to finish his paper, so he had a friend do it for him *** C: Rachel wanted

9. ## pysics

three identical point charges each Q coulombs are placed at the vertices of an equilatwral triangle 20cm apart.calculate the force on each charge

10. ## Algebra

Helen deposited \$1200 at 5% interest compounded continuously. After 6 years, how much did she have ? I got \$2,160 but I was told it was incorrect

11. ## Maths

There are 9 counters in a bag. There is a number on each counter. 1, 1, 2, 2, 2, 3, 3, 3, 3. Joanne adds together the numbers on the 3 counters to get her total. What is the probability that he total is 6? Thank you.

12. ## Chemistry

A weather balloon is filled with helium that occupies a volume of 4.39 x 10^4 L at 0.995 atm and 32.0°C. After it is released, it rises to a location where the pressure is 0.720 atm and the temperature is -14.1°C. What is the volume of the balloon at

13. ## Math

In what proportion should you combine 2:5 soaking solution and distilled water to create 1:20 solution?

14. ## PHYSICS QUESTIONS

Two springs, with force constants k1=175N/m and k2=270N/m, are connected in series, as shown in (Figure 1) .When a mass m=0.50kg is attached to the springs, what is the amount of stretch, x?

15. ## physics

fluid of constant density = 960 kg/m3 is flowing steadily through the above tube. The radius at the sections are r1 = 0.05 m, r2 = 0.04 m. The gauge pressure at 1 is P1 = 200 000 Pa and the velocity here is v1 = 5 m/s. We want to know the gauge pressure at

16. ## History

1. "If slavery is not wrong, nothing is wrong ... And yet I have never understood that the Presidency conferred upon me an unrestricted right to act officially upon this judgment and feeling ... I claim not to have controlled events, but confess plainly

17. ## Chemistry

The enthalpy of combustion of benzoic acid (C6H5CO2H) is –3228 kJ/mol. The burning of 1.698 g of benzoic acid in a calorimeter causes the temperature to increase by 2.865 ºC. What is the heat capacity (in kJ/ºC) of the calorimeter?

18. ## physics homework

When a mass m=0.50kg is attached to the springs, what is the amount of stretch, x? When a mass m=0.50kg is attached to the springs, what is the amount of stretch, x?

19. ## Physics

A 30 ohm resistor is connected in parallel with a variable resistance R and the parallel combination is then connected in series with a 5 ohm resistor, and connected across 120 volt source. Find the minimum value of R if the power taken by R is equal to

20. ## Physics - Voltage across a wire of unknown length

Four copper wires of equal length L are connected to a 100V source. Their cross-sectional area are 1cm^2, 2cm^2, 3cm^2, and 4cm^2. Find the voltage across the 3cm^2 wire. Leave your answer in terms of L, it should cancel out. - So I tried using and

21. ## Math

Show that the bisector of the vertical angle of an isosceles triangle bisect the base at right angles

22. ## physics question

When you take your 1700-kg car out for a spin, you go around a corner of radius 55 m with a speed of 20 m/s. The coefficient of static friction between the car and the road is 0.88.Assuming your car doesn't skid, what is the force exerted on it by static

23. ## commercial law

Discuss the res perit domino rule in a contract of sale.

24. ## Chemistry-Urgent

A gas at 61°C occupies a volume of 0.67 L. At what Celsius temperature will the volume increase to 1.12 L? whats the answer didn't understand

25. ## English

W:Hello. May I speak to Mr. Johnson? M: Speaking. 1. Who's calling, please? -------------------------- 2. Who's talking, please? 3. Who's speaking, please? (Can we use #2 and #3 instead of #1 in telephone conversation?)

26. ## PHYSICS

When a 8.88 kg mass is placed on top of a vertical spring, the spring compresses 4.54 cm . Part A Find the force constant of the spring. 8.88kg*9.81=87.1128 divided by4.54 =19.187N/CM 0.0001918784141 KN/M IS IT RIGHT? PLS HELP

27. ## Chemistry

A fixed amount of oxygen gas is held in a .500 L tank at a pressure of 4.09 atm. The tank is connected to an empty 1.50 L tank by a tube with a valve. After this valve has been opened and the oxygen is allowed to flow freely between the two tanks at a

28. ## Statistics

LED light bulbs are manufactured with an average life span of 16 years and the bulb lifespans are known to follow an exponential distribution. a. What is the probability that a bulb will last longer than 14 years? b. What is the 50th percentile (or median)

29. ## Physics 2

α of gold is 14.3x10^-6/C°. The density of gold is 19.3 g/cm^3 at 20℃. Determine its density at 140℃.

30. ## physics

Driving in your car with a constant speed of v= 22 m/s, you encounter a bump in the road that has a circular cross-section, as indicated in the figure. If the radius of curvature of the bump is 52 m, find the apparent weight of a 66-kg person in your car

31. ## Maths

A deposit mature to 24200 after 3yeras at simple interest of7 percent per annum what is the principal amount of deposit

32. ## Macroeconimcs

2. Suppose the national debt is \$80 trillion and the government spends \$800 billion during the fiscal year on goods and services. In addition, the government collects tax revenues of \$600 billion and makes transfer payments equal to \$300 billion. Assume

33. ## Geometry

On the scale drawing of a floor, plan A room is 7 in. long on the scale drawing. Find the actual length of the room.

34. ## Math

The 6th and the 13th term of a GP are 24 and 3 by 16 respectively find the sequence

35. ## Chemistry

Air trapped in a cylinder fitted with a piston occupies 163.1 mL at 1.08 atm pressure. What is the new volume when the piston is depressed, increasing the pressure by 25%?

36. ## Statistics

The weight of a randomly selected shipping container follows an unknown distribution with mean 12 tons and standard deviation 2 tons. Your cargo ship always carries a load of 100 randomly selected shipping containers. a. What is the probability the load

37. ## Statistics

The admissions counselors at rainy University believe that the freshman class they have just recruited is the brightest yet. If they want to test this belief (that the freshmen are brighter than the other classes), what are the null and alternative

38. ## Maths

The hcf of 140 and x is 20. The lowest common multiple of 140 and x is 20. What is the value of x? Thank you.

39. ## Physics

A ray of light with wavelength 589 nm passes through an unknown material with a velocity of 1.94 x 10^8 m/s. What is the material? I think this problem has something to do with Snell's law, but there is no given angle of refraction so I don't know how to

40. ## Statistics

Consider the population (1,3). Suppose you take all possible samples of size n=3 with replacement. What is the sampling distribution of the sample total?

41. ## Chemistry

If the thermometer reads 22 c and this corresponds to 19.8mmhg of water pressure , what is the pressure of a pure gas collected over water if the total pressure is 760 mmhg?next calculate the pressure of the gas and lets assume its hydrogen gas in atm.

42. ## Chemistry

The pressure of a sample of helium in a 3.40 L container is 0.988 atm. What is the new pressure if the sample is placed in a 2.15 L container?

43. ## rida

50 meter cloth is purchased for rs 3725 how much cloth is purchased for rs 1788

44. ## Science

A car starts from a stopped position at a red light. At the end of 60 seconds, it's speed is 30 meters per second. What is the acceleration of the car?

45. ## Physics

Ten cars at an intersection are blowing their horns simultaneously, creating a 100 decibel sound in the middle of the intersection. What is the average sound level for each car? 10/100= 10db per car?? Idk

46. ## chem

Air trapped in a cylinder fitted with a piston occupies 162.2 mL at 1.08 atm pressure. What is the new volume when the piston is depressed, increasing the pressure by 25%? what is the answer? didnt understand?

47. ## Algebra

Helen deposited \$1200 at 5% interest compounded continuously. After 6 years, how much did she have ? I got \$2,160 but I was told it was incorrect

48. ## English

Jaywalking is a minor_____ of the law. choices: transgress or transgression answer: transgression

49. ## math

Compound Interest formula solution P[1+r/100]t?

50. ## physics

the Ferris wheel has a diameter of 150m and takes 30min to make a full circle. Determine the speed of ride in m/s

51. ## Math fp1

I have a general question For example we have matrix M1 and mattix M2, 2x2 both I wanna do the product m2m1m1m2m2m1m1m2 Is there a shortcut like factorising? Can you give me some basic rules about these please? Thank you

52. ## physics

A water main with a radius of 0.15 m contains water with an average velocity of 3 m/s .What is the flow rate in the water main?

53. ## algebra

Find the lengths of each side of this triangle. Show calculations. Short arm=X; Long arm=1/2X+11; Hypotenuse=2X+1. Thanks a lot for your help.

54. ## math

the distance between two towns A and B is 150 kilometers. This distance is represented on a map by a length of 300 millimeters. If the scale of this map is in the form of 1:a, find the value of a

55. ## Macroeconomics

Suppose the national debt is \$80 trillion and the government spends \$800 billion during the fiscal year on goods and services. In addition, the government collects tax revenues of \$600 billion and makes transfer payment equal to \$300 billion. Assume the

split level for 200,000 put down 30% assuming rate of 11 1/2% on 30-year mortgage, determine monthly payment.

57. ## english

what verb tense is "having spent"

58. ## History

Who was alvars and nayanars

60. ## chem

A gas at 61°C occupies a volume of 0.67 L. At what Celsius temperature will the volume increase to 1.12 L?

61. ## Mathematics

X+6 _________ | \ | \ |x-1 \ | \ |____________\ 3x-4 The area of the trapezium is 119cm. What is the value of x? Thank you.

62. ## Mathematics

X+6 _________ | \ | \ |x-1 \ | \ |_____________\ 3x-4 The area of the trapezium is 119cm. What is the value of x? Thank you.

63. ## Math

How to get 44 using the digits in 2017. You can use +,-,×,÷,√,!,!!,exponents. Double digit numbers are allowed