# Questions Asked onJuly 9, 2010

1. ## Physics

On a winter day the temperature drops from -5 degree C to -15 degree C overnight. If a pan sitting outside contains 0.40kg of ice, how much heat is removed from the ice for the temperature change? (specific heat (ice) = .5kcal/kg) Is it 02.0kcal?

2. ## economics

Market research has revealed the following information about the market for chocolate bars. The demand schedule can be represented by the equation QD=1,600-300P, where QD is the quantity demanded and P is the price. The supply schedule can be represented

3. ## Physics

The motion of a piston in an automobile engine is nearly simple harmonic. If the 1-kg piston travels back and forth over a total distance of 10.0 cm, what is its maximum speed when the engine is running at 3 000 rpm? The answer is 15.7 m/s but I don't

4. ## physics

1)A toy train is initially at rest on a track fastened to a bicycle wheel, which is free to rotate. How does the wheel respond when the train moves clockwise? When the train backs up? Does the angular momentum of the wheel-train system change during these

5. ## Physics

While running, a person dissipates about 0.6 J of mechanical energy per step per kilogram of body mass. If a 60-kg person runs with a power of 70 Watts during a race, how fast is the person running? Assume a running step is 1.5 m long.

6. ## Physics

The major difference between transverse and longitudinal waves is the (a)direction of the wave motion (b)direction of the particle placement (c)direction of the particle displacement with respect to the direction of wave motion

7. ## Physics

A large calorie (Cal) is the amount of heat needed to change the temperature of one __________ of water by one degree Celsius. Is it gram or kilogram?

8. ## Physics

When a circular hole is drilled into an aluminum sheet, does the diameter of the hole become larger or smaller when the sheet is heated?

9. ## physics

find the total momentum of electrons in a straight wire of lenght 1000m carrying a current of 70A.

10. ## physics

Suppose a charge of -2.30 µC is at the origin and a charge of 2.90 µC is at the point (0, 3.00) m. (a) Find the electric potential at (4.00, 0) m, assuming the electric potential is zero at infinity. (b) Find the work necessary to bring a 4.40 µC charge

11. ## college

while a patient is having surgery,his doctor notices a small mole.The doctor doesn't think the mole is anthing to worry about,but he decides to remove it to perform a biopsy.What is the doctor guilty of?

12. ## Physics

Wave amplitude is related to what? (a) wave velocity (b) frequency (c) energy (d) wavelength

13. ## American literature

compare and contrast the characters Natty Bumppo in the prairie and john in the hospital sketches

14. ## Physics

Wave velocity is inversely proportional to what?

15. ## Physics

1) A small dense object is suspended from the rear view mirror in a car by a lightweight fiber. As the car is accelerating at 1.90 m/s 2, what angle does the string make with the vertical? 2) A patient is to be given a blood transfusion. The blood is to

16. ## Trig

Cos(21)cos(9)-sin(21)sin(9)

17. ## Physics

What is the wavelength in meters of radio waves produced by a radio station with a frequency of 1400 kHz? Is it 214.3 m?

18. ## economics

Beach front resorts have an inelastic supply and automobiles have an elastic supply. Suppose that a rise in population doubles the demand for both products(that is the quantity demanded at each price is twice what it was) a, what happens to the equilibrium

19. ## Physics

A hydrometer consists of a spherical bulb and a cylindrical stem with a cross-sectional area of 0.400 cm^2. The total volume of the bulb and stem is 13.2 cm^3. When immersed in water, the hydrometer floats with 8.00 cm of stem above the water surface. When

20. ## Trigonometry

Cos(21)cos(9)-sin(21)sin(9)

21. ## math

write the mixed number as an improper fraction 6 2/3

A bus starts from rest and accelerates uniformly for 20 seconds to a speed of 18 km/h. It then moves with a uniform velocity and it is finally brought to rest in 100 meteres with a constant retardation. If the total distance travelled is 0.5km. Find the

23. ## bus 303

why is it so important for employees to go through orientation

You have 32 coins. Some are nickels and otheres are dimes. How many coins are dimes? How many are dimes?

25. ## Maths

Hi, need a bit of help on this one. A straight line passes through the points (4,3) and (10,0), I need to write down the equation of the line in the form y=mx+c, I have tried but I cant seem to get the second coordinates to satisfy the equation. Here is

26. ## Ethics

In basketball is it ethical to keep scoring when the differential is 100 points? Why or why not?

27. ## history

the twenty fifth amendment describes the sequence of events that would install the vice president as acting president against the will of the president. outline that sequence of events

28. ## Calc 2 college

Modeling with differential equations. If a bacteria culture doubles every 10 minutes and the original culture has 300 cells determine the rate of growth.

esque vous pouvez maide

30. ## Calc 2

Differential equations. There are gophers in a very large vacant lot. The original population is 30 Gophers. After 2 months there are 38. When will there be 45 gophers? round answer to nearest tenth of a month

find the equation of the line 1.(-2,-8) and (-5,-6) 2.(-1,-1) and (2,2) 3. 6/7, (1,-8) 4.9, (9,1)

32. ## physics

1. consider a satellite with a period of 8 hours. if the radius of the satellite's orbit is doubled, what is the period for this satellite's. 2.what is the minimum amount of heat ( in joules) needed to heat 5.0kg (5 liters) of liquid water from it frezing

Write the equation of the lines.....best answer will be chosen 1. (3,-6) 7y+4y=5 2.(4,7) 7x+y=6 3.(-8,8) 5x=7y+6 4.(3,8) x+9y=2

find the equation of the line using y= 6/7, (1,-8) 9, (9,1)

35. ## riddles

is any one good at riddles? here is the clue for the treasure. a pointy thing to the north and east. And a drink that will get you high beyond.An education will help you find it.But it's still no magic wand.

36. ## Calc 2

Solve the Separable equation y=((sqrt(1-y^2)) x^2

37. ## Calc 2

Solve the following separable equation y'=e^2x/4y^3

38. ## Research

Define the terms “valid” and “reliable” as they relate to statistics. Can a test be reliable and not valid or vise versa? Why or why not?

39. ## chem 121

arrange in order of increasing vapor pressure lowest to highest Nacl, ch4 ch3ch2oh c

40. ## Chemistry

what is the molarity of a solution prepared by dissolving 222 g of sodium carbonate in enough water to make a solution volume of 3250 mL's?

what is environmental ethics and human values?

42. ## Physics

Wave amplitude is related to what?

43. ## Physics

How much heat is necessary to change 20g of ice at 0 degree C into water at 0 degree C? (Lf = 80kcal/kg) is it 1.60kcal?

44. ## math

Solve the following system of equations x + 4y=6 x= 4-4y A. The solution is an ordered pair ( , ) B. No Solution

45. ## Math

8x - (6x + 8) =6 The solution is x =

46. ## Algebra

F) Why is (3x + 5) (x - 2) + (2x - 3) (x - 2) not in factored form? What is the correct final factored form? What is this factoring method called?

47. ## Math

5/8x + 1/6x = 11/16 + x the solution is x= enter solution as integer or simplified fraction.

48. ## math elimination method

elimination method really confuses me. solve by elimination method 5r -3s = 17 3r + 5s =17 A. solution is ______ (ordered pair, integer or fraction) B. Infinitely many C. No Solution

49. ## substitution method

I am burned out on math or just confused. 3x + 7y=10 x= 2-2y A. Solution is an ordered pair B. No solution

50. ## Math last one !

I have seen examples of this but the examples are not helping me solve it or set it up as a y=mx +b The equation y= -1777x + 27,153 can be used to predict the number of gun deaths in the U.S. x years after 2000, x=0 corresponds to 2000 x=3 corresponds to

51. ## English

Which of the following is the bst example of a citation reference for a work by one author? a. Marks 1999 B. (Marks, Bill.1999) c. (Marks-1999) d. Marks et.al. 1999 e. none of the above I know that C and D are wrong I think A is wrong as it has no

52. ## grammar

Part III: Revision In this section of the final, revise the sentences provided to correct the grammar errors indicated. (In many cases there will be more than one correct alternative to the sentence provided; credit will be given for all correct answers.)

53. ## trig

Hi,how do I find both solutions of the equation cos0 = 0.35 between degrees 0 and 360? Many thanks

54. ## English

Which of the following choices is not necessary information for a works cited list? A. the publisher's name B. The number of pages in the book C. date of publication Is B correct? Juct checking, Thanks!

55. ## math

Solve for t: √(t-108) - √(t+186) = 66

56. ## math

Solve for t: √(t-108) - √(t+186) = 66

57. ## math

Solve for t: √(t-108) - √(t+186) = 66

58. ## calculus

Solve for t: √(t-108) - √(t+186) = 66

59. ## calculus

A box with a square base and no top is to be made from a square piece of carboard by cutting 7 in. squares from each corner and folding up the sides. The box is to hold 16128 in3. How big a piece of cardboard is needed? ?in by ?in

60. ## math

Show that x^2+y^2-6x+4y+2=0 and x^2+y^2+8x+2y-22=0 are orthogonal.

61. ## chemistry

Food and Drug Administration (FDA) recommends that adults ingest less than 2.4 g of sodium per day. How many liters of softened water, containing a sodium concentration of 0.050% sodium by mass, have to be consumed to exceed the FDA recommendation? (Assume

62. ## math

The perimeter of a rectangular picture is 240 inches. the length is twice the width. Find the length and the width

63. ## trig

jet stream which is flowing at a rate of 80 miles per hour. It travels with the jet stream for 5 hours and then reduces its altitude, flying out of the jet stream for 4 more hours. The plane, while out of the jet stream, covered 550 miles less than it did

64. ## accounting

Why is cost recognized as an expense at the time of a sale?