1. math

A road perpendicular to a highway leads to a farmhouse located 8 mile away.An automobile travels past the farmhouse at a speed of 80 mph. How fast is the distance between the automobile and the farmhouse increasing when the automobile is 7 miles past the

2. physics:(

The weight of a book on an inclined plane can be resolved into two vector components, one along the plane, the other perpendicular to it. At what incline angle are the components equal? I was kind of thinking 45 degress?????? At what incline angle is the

3. science

Trees are renewable resources, aren't they? Because when people cut them down, you can just plant new ones. However, is the wilderness renewable? If not, how can this be? I am reading A Sand County Almanac and Leopold says that wilderness is a resource

4. Calculus

Estimate delta(x) using the Linear Approximation and use a calculator to compute both the error and the percentage error. f(x)=cosx a=(pi/4) delta(x)=.06 delta(x)= ______ i got this part and it's -.04242 The error in Linear Approximation is: and The error

5. maths indices

Simplify: (2x+3)^3/2 + (2x+3)^-1/2 / 2x+3 Can anyone explain how to work it out please? Thanks

6. Physical science

If you do 600 Joules of work hoisting a 20 Kg bale of hay, to what height did you lift it?

7. Physical science

An elevator motor did 300,000 Joules of work lifting a freight elevator(mass=500.0kg). If this story is 5.0 m and the elevator started on the ground floor, what is the highest level it could reach?

8. Physics

Hi can someone advise whether my methodology is right on this with a potential energy of 589 kJ per tonne, 100 tonnes of water per second are delivered to a turbine. Assuming all the potential energy of this water is used to drive the turbine how much

9. American History

Elastic Clause: To make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this Constitution in the government of the United States, or in any department or officer thereof. Why is

10. english

ummm okay well we had to pick a song that was a ballad.And now we have to make a presentation on why it's a ballad and watever. The song that I pick is " runaway love by ludacris" Is that a ballad?

11. u.s. government

what are the disavantages and the advantages of the articles of confederation?

Please explain to me how to do the following problems, I don't understand them. Thanks! Find the x-intercepts (if any) for the graph of the quadratic function. 1.f(x) = (x + 2)2 - 4 Find the y-intercept for the graph of the quadratic function. 5.y + 9 = (x

13. Algebra- Maximum and minimum.

I don't understand how to find the maximum and minimum. Determine whether the given quadratic function has a minimum value or maximum value. Then find the coordinates of the minimum or maximum point. 15.f(x) = -x2 + 2x - 4 20.f(x) = 2x2 - 4x 19.f(x) = x2 -

14. microeconomics

hi i was wondering if anyone could help me out with this qn: what is the reason why firms ofter charge a lower price at higher output levels?

I was wondering could anyone help me with question 6 an page 302 of the Business Studies for households and enterprises Junior Certificate by Matt Hynes

16. math help

Vivian needs 11 1/2 yards of rope for one project and 2 9/16 yards of rope for a second project. What is the total amount of rope needed

17. Physics

Hi Can someone check and advise on this potential energy of 2 tonne of water held 120m above a flood plain by a dam. potential energy = 2032 kg (2 Tonne) x 9.81 ms x 120m pe = 2392070.4 Joules Convert to kilojoules 2392070.4 / 1000 pe = 2392 kJ (To four

18. Physics/Moons Orbit

The Moon describes an elliptical path around the Earth and a complete orbit is 29d 12h 44m 3s Approximately! At its closest during this orbit it is termed Perigee and at its farthest Apogee. However there must be 2 other points opposite Perigee & Apogee

19. grammar/sentence structure

would someone please check over my paragraphs for any grammatical errors, and more importantly, correct sentence structure? I was told I was bad at both... thank you so much in advance! The case of scientific fraud I would like to discuss extensively is

20. GRAMMAR/SENTENCE STRUCTURE

John Darsee has been one of many scientists and researchers involved with the scandal of scientific misconduct, where he deliberately falsified data and published his results to scientific journals. First, I will discuss the case of John Darsee, as well,

21. ap chem

How do you set this problem up? A laser emits at a wavelength 987 nm. all of its output energy is absorbed in a detector that measures a total energy of .52 joules over a period of 52 seconds. how many photons per second are being emitted by the laser?

22. essay edit

sorry to do this to you, gurublue, but i had to break it up into different pieces...this is the last one, i swear!! The scientific misconduct case of John Darsee is wrong and immoral, based on the moral theory of rule utilitarianism. I will argue why this

23. Math

How good are you with probablity

24. American History

Why does it take more states to ratify an amendment than to propose one?

25. history

A political scientist aruges that we have made all the constitutional changes necessary to expand sufferage. What do we need to do now is to foster the civic norm that increse citizen participation. Do you agree of disagree with that argument and WHY???

26. Physics

Driving in your car with a constant speed of v=13.0 m/s, you encounter a bump in the road that has a circular cross section. If the radius of curvature of the bump is r=33.2 m, calculate the force the car sear exerts on a 72.7 kg person as the car passes

27. science

Please can someone help me with this question? By official definition, true wilderness is a roadless area with roads only built to its edges. Name some specific wilderness areas that fit this definition. Thanks!

28. chemistry

What makes certain inks permanent and others washable? And why does "permanent" ink still dissolve in water.

29. grammar

A. Identifying Subjects and Predicates If the simple subject is in parentheses, write SS on the line. If the simple predicate is in parentheses, write SP. Write CS if the words in parentheses are the complete subject and CP if they are the complete

30. brain teaser

what does this mean? i i 0 0 0 0 0 0 0 0

31. Physics

The distance between earth and the moon can be determined from the time it takes for a laser beam to travel from earth to a reflector on the moon and back. If the round-trip time can be measured to an accuracy of 0.19 of a nanosecond (1 ns = 10-9 s), what

Does anyone know of a site with a cheap, trustworthy, adopt an animal program??? I know Defenders of Wildlife(\$25 per animal w/ stuffed animal) and WWF(\$50 per animal if you want the stuffed animal, thanks

33. chemistry

what make permanent markers permanent and washable markers washable and why does that change with alcohol?

34. science

what are the 3 basic morphological arrangements of a sensory receptor cell?

35. Physics

Consider a heavy rope with mass per unit length 2.10 kg/m; a length L=18.00 m of the rope is hanging vertically from a support, as shown. If the support and rope are placed in an elevator accerlerating downward with a=0.800 m/s^2, what is the tension in

36. American History repost for Amy

American History - Amy, Saturday, October 13, 2007 at 7:43pm Emancipation and reconstruction

37. science(chem)

[b]1.[/b]Is TLC a qualitative or quantitative analysis? Is there any way that it can be both? Explain. ~I say it can be both since it can be used to go and determine what exactly is in a sample of mixed compounds which would be qualitative analysis. It can

38. science (chem)

consider a sample that is a mixture of biphenyl, benzoic acid, and benzyl alchohol. The sample is spotted on a TLC plate and developed in a methylene chloride cyclohexane mixture. Predict the relative Rf values for the three components in the sample. For

39. pre- calculus

how do you find the root(s) of the equation x^2+3x-4=0

40. U.S. government repost for Aisha

u.s. government - aisha, Saturday, October 13, 2007 at 9:27pm who is the founder of our goverment.

41. American History

why are the presidential cabinet and political parties called part of the unwritten constitution?

42. Physics Problems

Will check my work and help me with the last two problems please? A 4 kg ball has a momentum of 12 kg m/s. What is the ball's speed? -(12 kg/m/s) / 4kg=3m/s A ball is moving at 4 m/s and has a momentum of 48 kg m/s. What is the ball's mass? -(48kg/m/s) /

43. science

What makes certain inks permanent and others washable? And why does "permanent" ink still dissolve in alcohol?

44. AP Physics

Could you please explain to me these problems, I don't understand them. Do 100 J of work in 50 s and your power output is? A bow is drawn so that it has 40 J of potential energy. When fired, the arrow will ideally have a kinetic energy of ? A diver who

45. Physics

At one time, television sets used "rabbit-ears" antennas. Such an antenna consists of a pair of metal rods. The length of each rod can be adjusted to be one-sixth of a wavelength of an electromagnetic wave whose frequency is 65.0 MHz. How long is each rod?

46. physics

Please help with these problems. Thanks! Suppose the circumference of a bicycle wheel is 2 meters. If it rotates at 1 revolution per second when you are riding the bicycle, then your speed will be? Suppose you're on a Ferris wheel at a carnival, seated 10

47. History

Was Venice, Italy always flooded by water? Was it made on-top of the ocean, or was it made, and later flooded?

48. science-physics/math

What is the largest possible displacement resulting from two displacements with magnitudes 3 m and 10 m? do you have to use a^2+b^2=c^2 What is the smallest possible resultant?

49. SCIENCE

i need a 10 letter word for "all the members of a species that live in the same space

50. science

i need a 9 letter word for "structures that have no use

51. science

does ab anthropoid still exist today????? [type of ape thing]

52. Criminal Justice

Can a police officer bring up the matter of a multi-state drug traffiking case to the federal court system?

53. Essential Mathematics 1

in a track meet four athletes scored 1 1/2, 8 3/4, 5 1/8 and 1 1/4 points for their team. what is the total number points they scored?

54. Essential Mathematics 1

which is heavier 9 5/8 or 9 3/4 pounds?

55. Mathematics

a costume designer brought 2 1/2 yards of black silk, 3 yeards 6 inches of white silk, and 6 1/3 yeards of blue silk. how many yeards of silk did she buy?