# Questions Asked onFebruary 23, 2007

1. ## Physics

A person is making homemade ice cream. She exerts a force of magnitude 17 N on the free end of the crank handle, and this end moves in a circular path of radius 0.28 m. The force is always applied parallel to the motion of the handle. If the handle is

2. ## winterWx

What is the average translational kinetic energy of nitrogen molecules at 1500 K, in the following units? (a) J (b) eV I already provided the formula for average KE in Joules, in an answer to a separate question of yours. average KE = (3/2) k T 1 eV =

3. ## Math

1) Which of the following ingegers can not represent the lengths of the sides of a triangle? (9,10,11) (4.7,9) (4,8,12) & (6,6,11) Try drawing the 4,8,12 triangle. Have fun. any two sides must be longer than the third. Example with set 1. 9+10>11 10+11>9

4. ## winterWx

A soccer player kicks a soccer ball of mass 0.45 kg that is initially at rest. The force of the kick is given by F(t) = [(5×106)t - (2.5×109)t2] N for 0 ≤ t ≤ 2.0×10-3 s, where t is in seconds. (The player's foot is in contact with the ball for

5. ## winterWx

Compute the rms speed of a nitrogen molecule at 31.0°C. At what temperature will the rms speed be half that value? At what temperature will the rms speed be twice that value? T = 31 C = 304 K Mass M = 28 g/(6.02*10^23) = 4.65*10^-23 g = 4.65*10^-26 kg The

6. ## Math

If the measures of the angles in a triangle are in the ration 3:4:5, the measure of the exterior angle of the triangle can not be a) 120D b)165D c)105D d)135D b 165 With the triangle ratio of 3:4:5 the equation can be made: 3x + 4x + 5x = 180 x = 15 The

7. ## winterWx

A 0.30-kg softball has a velocity of 12 m/s at an angle of 30° below the horizontal just before making contact with the bat. What is the magnitude of the change in momentum of the ball while it is in contact with the bat if the ball leaves the bat with a

8. ## exponential eq: how to solve

4-x^2 = e^-2x please. This is a transidental equation. Numeric methods, such as iteration, or expanding functions to series and computing, or graphical methods can be used. I recommend graphical.

9. ## math, algebra,correction & help

directions are: write each fraction in simplest form: (-15x^3y^3)/(-20x^1y^4) My answeris: (3x^2)/(4y) THESE TWO NEXT ONES ARE THE ONES THAT I DON'T UNDERSTAND: pROBLEM #1 DIRECTIONS: Write each expression in simplest form. (4x-28)/(5x-35) Problem #2

10. ## Biology

how many pints of blood is in an average adults body? 9 to 12 I believe 56 Facts About Blood and Blood Donation One for each day between your blood donation! 4.5 million Americans would die each year without life saving blood transfusions. Approximately

11. ## Stats

2 samples were collected to determine whether there was a difference between two weight loss methods targeting men. The average weight loss method is provided for the 2 samples along with the respective standard deviations. Is the second method - with an

asked by Jason L
12. ## Physiology

DESCRIBE THE HUMAN CELLS AND HOW THEY HARVEST ENERGY (HOW WE DEAL WITH CARBS, LIPIDS AND PROTEINS.) Thanks!

13. ## I don't know the subject maybe writing

what is a working bibliography and how do you write one http://writing.colostate.edu/guides/trad_research/intro/pop2e.cfm

14. ## Geometry- how to write proof

ABC is a right triangle. Angle C is 90 degree. Altitude CD is drawn to hypotenuse AB. Prove AB/BC = BC/BD and AB/AC = AC/AD This is a theorem. How do I prove it? Thanks. Dont you have similar triangles? You can show this by looking at the angles

15. ## Math

(1) Which of the following ingegers can not represent the lengths of the sides of a triangle? (9,10,11) (4.7,9) (4,8,12) & (6,6,11) (2) The measures of two supplementary angles are in the ratio 5:1. What is the measure of the smaller triangle?

16. ## Math

Greg needs 234 feet of baseboard to finish trimming the floors in his house. He has 145 3/4 feet of baseboard. How much baseboard does he need to buy? 233 4/4 - 145 3/4 _________ 88 1/4 Am I working this correct? Yes. That is right! :-) Yes..... I have

17. ## physics

A 17.0 kg child travels down a playground slide 3.50 m high and reaches the bottom with a speed of 2.50 m/s. How much heat was generated due to friction as a result of this process? my teacher hadn't taught anything about heat..but he did give us this

18. ## SPANISH

HOW DO i WRITE A SENTENCE IN SPANISH ABOUT MY FAMILY Do this: Start with a sentence about your family in English. Then translate it to spanish. Get your dictionary out. We will be happy to check it for you. mi famila es grande, el amar y bueno Thank you

19. ## Math

Two Congruent angles are supplementary. The measure of each angle is? If A+ A= 180, then... 90

20. ## chemistry:energy level of element

each element has a different has a different set of energy level use this fact to explain why colour of light emited by an element in gaseous state is the characteristics of the element The light emitted is characteristic of a specific set of allowed

21. ## Accounting

Is unearned revenue included in the income statement? No, only the balance sheet.

22. ## logarithmic eq:

3logx = 6-2x Thanks This is a problem that is best solved by iteration, or graphing. I recommend graphing. There is no closed-form solution. You need to solve it by graphical or iteration (trial and error) methods. The answer is approximately 2.43, if the

23. ## chemistry

Why is the molecular formula of a gas not necessarily the same as its empirical formula? At higher temperatures, those that produce a gas, say, from a liquid, the kinetic energy of the molecule is large enough to break those bonds holding more than one

24. ## Statistics

In a study that was highly published doctors discovered that aspirin helps prevent heart attacks. The research project which was scheduled to last 5 years employed 22,000 american physicians (all male). Half took an aspirin tablet 3 times a week while the

asked by Jason L
25. ## What is so amazing about Shakespeare's plays?

Why do we have to learn Shakespeare in English? Most of his plays aren't even original. IMHO -- He was an ordinary man who managed to put together an amazing array of plays and other writings intended for the ordinary people during his time, not just for

26. ## Business law

The Supreme Court threw out a \$79.5 million punitive-damages award against cigarette maker Philip Morris. The high court voted 5-4 to overturn the jury verdict in the Oregon case, ruling it violated earlier high court decisions on limits to punitive

27. ## Calc easy

Having trouble getting the correct solution. The integral of “x squared” in the numerator and “x squared plus x minus 6” in the denominator. S X2 / (X2 + x – 6) dx Thanks! That's a messy one. According to my table of integrals. The answer is -x/6

28. ## maths complex numbers

Can abs(28-7w)=7abs(w) be written as abs(w-4)=abs(w) and if so why surely it should be abs(4-w)=abs(w) can any one explain why I can just chane the signs Yes, it can be written that way. I don't see that you have changed any signs, you factored a postive

29. ## maths

For the transformation w=z^2, find the locus of w when z lies on the imaginary axis. I thought the locus would be a line along the real axis as I thought w= r^2 or -r^2 but the book says it has argument pi which would mean only on the negative real axis ie

30. ## Physics

A basketball player makes a jump shot. The 0.700 kg ball is released at a height of 2.10 m above the floor with a speed of 7.30 m/s. The ball goes through the net 3.10 m above the floor at a speed of 3.10 m/s. What is the work done on the ball by air

31. ## Stats

the director of an insurance companies computing center estimates that the companies computer has a 20% chance of catching a computer virus. However they feel that there is only a 6% chance of the computers catching a virus that will completely disable the

asked by Jason L
32. ## Math

Solve for X: 4x - 2 +7 = 17 collect like terms on left hand side 4x + 5 = 17 subtract 5 from each side 4x = 12 divide by 4 on each side x = 3

33. ## algebra PLZ HELP!!!

y= 9/11x-17 9x-10y=179 You need to use parentheses to tell us what the problem is. Is equation 1, y = 9/(11x-17) or is it y = (9/11)x - 17? y= 9/11x-17 9x-10y=179 Rewrite them as 11 y - 9 x = -187 and -10 y + 9x = 179 Add the last two and you get y = -8

34. ## Writing

I am writing an introduction for a history fair project, my thesis is approved all I need to know is hoe my form of my introduction should go. You know where to put the thesis and where to start off and how to be a,b, and c where it needs to be. A good

35. ## maths

Hi, could someone please tell me how I would go about working these out: (the answer must be in the form a(sqroot)b where a and b are integers and b is as small as possible.) 1) Simplify (sqroot)500 2) Simplify (sqroot)50 x (sqroot)60 Also.. Simplify the

36. ## Math

The expression (3x+4) (2x-6) is equavalent to? 3x(2x-6)+4(2x-6) multipy out brackets to give: 6x^2 - 18x + 8x - 24 collect like terms to get: 6x^2 - 10x - 24

37. ## geography

what would be some simple sanitation uses in australia? and you were usin tools made by yourself. the location of australia is in the area of west and south Gippsland. also including Wilsons Promontory, Victoria I'm not sure what you mean by "sanitation

38. ## chemistry

Why is the molecular formula of a gas not necessarily the same as its empirical formula? answered above.

39. ## math

The measures of two supplementary angles are in the ratio 5:1. What is the measure of the smaller triangle? A/B = 5 A + B = 180 Solve those 2 equations in two unknowns. B is the smaller angle. Hint: substitute 5B for A in the second equation. Then only B

40. ## phone charges project

Okay I need to know something about cell phones and land lines. My parents can't answer this because we don't have a land line anymore. We just have cells phones. Okay my question is if someone with a cell phone calls a land line person long distance will

41. ## spanish

mi familia es grande, el amar y bueno. Is the ok? Don't say the bueno because that means and.... Here's what your saying: my family is great, good loving and. Get me??? Thank you for using the Jiskha Homework Help Forum. Please supply exactly what you wish

42. ## Math

In two inequalities below,both a and b are integers.how many values do a and b have in common? 4< a < 21 12< b < 24 - a can be 5, 6, .. 19 or 20 b can be 13, 14, ...22 or 23. Both a or b can be integers 13 through 20. Those are the "values in common" to

43. ## Physics

A 50g mass (M1) will be attached to the trolley M2) and will cause it to accelerate a distance of between .5 to .6m. You also catch the trolley immediately after it has passed through the photogate. The time for the trip will be noted and recorded. The

44. ## Survey

What first comes to mind when you see or hear the word blood? red, then death, then if i kept thinking, it wouldn't be a first thought sang -- as in the latin base

A local bank reports that 70% of its customers maintain a chequing acct, 50% have a savings acct and 40% have both.If a customer was chosen at random a) what is the probability customer has a chequing or saving acct b)probability the selected customer has

46. ## math

wat is dilation in math during moving or changing a figure

47. ## Math-- Fractions-- I Desperately Need Help!!

I need help with this problem. Estimate 16 20/21 times 28 3/7 minus 4 13/25 plus 8 2/47 as a whole number or as a mixed number where the fractional part is 1/2 (Possible answers) One is the correct answer. A. 452 B. 480 C. 488 D. 492 1/2 I have tried to

48. ## To Jiskha

I have one question: Whatever happened to the Instant Messaging thing which helped me alot when I was doing my homework? I wish that you could put it back on. My friends and I which I recommended to the site loves the message boards but they are not fast

49. ## Where are the teachers?

I really need help and no offense but I would prefer Dr.Bob or Writeacher or somebody that knows what they're doing. Where are they? okay well i'm not a teacher but i will try to help if i can. i'm a tutor if that gives you any confidence Okay, how do you

50. ## bobpursley,math

about this problem , I figured it out and i did get the answer right except that i had forgotten to make it a negative like this: directions: subtract 4x-2x^2+4x^3 from 4x^3+x-3x^2 -------------------------------- 4x^3-3x^2+x -(4x^3-2x^2+4x)

51. ## math

rewrite each equation as afunction of x.-3y+4y=11 Where are the equations? rewrite this equation as a function of x.-3y+4y=11 y=x

52. ## math

Substitute -1 for x. Simplify. If f(x) = 4x-3, find the following. f(-1)

0.2

54. ## Math

Evaluate: (-1)^25 (-2)^3 well, the negative one to an odd power is negative one. -2 cubed is -8. What is negative one times negative eight>?

55. ## math

Whatwould be the answer 3+9+6+52x963+??? The answer depends upon where you put the parentheses. The order of operation makes a big differnece The answer depends upon where you put the parentheses. The order of operation makes a big differnece I agree with

56. ## Math-- Please Check

1 2/5 divided by 21 Which example is correct 7/5 * 1/21 = 7/105 = 1/15 or is it? 5/7 * 21/1 = 105/7 =15 You asked this question yesterday. The answer is still the same.

57. ## Bacteria

What structural features of bacteria do you think help them to survive? Name four characteristics of bacteria that aid them in producting disease. http://en.wikipedia.org/wiki/Bacteria please read the link and then think about these statements: fast

58. ## Math

What is the product of 5x^2 and 3x^5? exponents add, so 15x7