Science & Mathematics - 13 November 2007

HELP

2007-11-13 13:13:48 · 5 answers · asked by volcomstone27 2 in Engineering

An 62.0 N box of clothes is pulled 5.6 m up a 30.0° ramp by a force of 95 N that points along the ramp. If the coefficient of kinetic friction between the box and the ramp is 0.22, calculate the change in the box's kinetic energy.

Can u show me what to do???



How long will it take a 1620 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above? again please

2007-11-13 13:13:29 · 1 answers · asked by Anonymous in Physics

find the angle between the pair of lines 6x(square)+13xy+6y(square)+8x+7y+2=0

2007-11-13 13:11:52 · 1 answers · asked by Anonymous in Mathematics

What are the circumstances/requirements for the nuclear chain reaction to occur?

Also... Why would there be a subcritical mass of a fissile isotope?

2007-11-13 13:10:48 · 3 answers · asked by Anonymous in Chemistry

name to of these elements

2007-11-13 13:10:37 · 4 answers · asked by mbee 3 in Chemistry

1. How can you tell whether 2 sets of data vary directly?

2. how can you tell if a line is the graph of a direct variation?

2007-11-13 13:07:51 · 4 answers · asked by Anonymous in Mathematics

I've heard from some friends of mine that physics can't understand how bees fly. That the math just says they shoudn't be able to fly. Is that true? If so how do they fly then?

2007-11-13 13:06:12 · 7 answers · asked by Eric 2 in Physics

with illustration

2007-11-13 13:04:54 · 2 answers · asked by nomad A 1 in Chemistry

2007-11-13 13:03:04 · 1 answers · asked by Anonymous in Physics

What would an equation be to show how a buffer made up of equimolar amounts of acetic acid, CH3COOH, and acetate, CH3Coo-, would behave when HCl was added and then when NaOH is added?

2007-11-13 13:00:44 · 1 answers · asked by kaj 1 in Chemistry

three particles each of mass 5g each located at a corner of equilateral triangle with side length of 30cm
what is the potential energy of the system

2007-11-13 12:59:43 · 2 answers · asked by MeNeedHelp 2 in Physics

its a quadratic:
10t^2-9t=1
what would t be?
and once again, pleas show your work.

2007-11-13 12:54:34 · 7 answers · asked by bballdud123 2 in Mathematics

2007-11-13 12:54:19 · 1 answers · asked by afchica101 1 in Zoology

Please dont guess...i will give ten points to the first good one
2. Larger wings on a plane create what?
3. Why can a steel ship float?
4.what makes an object sink?
5. Buoyant force is _______ to the weight of the water is displaces.
6. How does pressure affect the flow of fluids?
9. What affects the amount of lift on an airplane's wing?
10. Where is atmospheric pressure be the greatest?
11.How does the design of a wing enable a plane to fly?
12. What does bernoulli's state(in your own words)
13.What does pascals principle state(in your own words)
14 Why do jet pilots wear pressurized suits?
15. Why does a tire expand when you pump air into it?
17. what is a hydraulic lift? how does it work?
20. Using Bernoulli's principle, what is net force?

2007-11-13 12:52:53 · 1 answers · asked by Anonymous in Physics

Is there a time before the starting time of the universe?

2007-11-13 12:52:17 · 5 answers · asked by Anonymous in Astronomy & Space

at which tapping the auto transformer behaves like a star delta starter

2007-11-13 12:52:16 · 2 answers · asked by chandra p 1 in Engineering

A. Sugar dissolves in water
B. A person swallows a pill
C. A drug is injected with a hypodermic needle
D. Water soaks into a sponge
E. Skin lotion is rubbed onto the hands.

My guess was C but I'm not sure if that is right.

2007-11-13 12:50:27 · 3 answers · asked by painterP 1 in Biology

can you explain to me how to do this?
Sec s + Cot s Csc s = Csc^2 s Sec^2 s

2007-11-13 12:48:31 · 4 answers · asked by VHS123 2 in Mathematics

I was just wondering are they similar animals?

2007-11-13 12:48:27 · 7 answers · asked by Michell G 3 in Zoology

A small rubber wheel is used to drive a large pottery wheel, and they are mounted so that their circular edges touch. Assume that the small wheel has a radius of 2.0 cm and accelerates at the rate of 7.2 rad/s2, and it is in contact with the pottery wheel (radius 25.0 cm) without slipping.

1)Calculate the angular acceleration of the pottery wheel. (rad/s2)
2)Calculate the time it takes the pottery wheel to reach its required speed of 61 rpm.(s)

2007-11-13 12:47:56 · 1 answers · asked by Corey S 1 in Physics

2007-11-13 12:47:55 · 34 answers · asked by Anonymous in Other - Alternative

Thanks!

2007-11-13 12:47:38 · 2 answers · asked by cherryblossom32496 1 in Chemistry

Compared to some original speed, how much work must the brakes of a car supply to stop a car moving four times as fast? How will the stopping distance compare?

2007-11-13 12:46:42 · 1 answers · asked by Anonymous in Physics

If not, what are they exactly?

2007-11-13 12:46:01 · 2 answers · asked by Anonymous in Chemistry

Assume that during each pulse a mammalian heart accelerates 21 g of blood from 18 cm/s to 28 cm/s during a time interval of 0.10 s. Calculate the magnitude of the force (in newtons) exerted by the heart muscle on the blood.

2007-11-13 12:45:40 · 2 answers · asked by To-the-Stars 4 in Physics

All distinct arrangements of the letters "AAABBCCCDDDDEE" are placed in a bag and one is drawn at random.

What is the probability that it is AAABBCCCDDDDEE?

2007-11-13 12:44:13 · 2 answers · asked by Anonymous in Mathematics

2007-11-13 12:43:17 · 19 answers · asked by M M 1 in Weather

I guess my real question is "Is it possible to control the roll of a rocket using one gimballed thruster at the base of the rocket?"

2007-11-13 12:43:00 · 1 answers · asked by yatpay 1 in Physics

i need to know how to get the answers step by step. all i need is the answere, but i do not know where to begin.

1.Carbon absorbs energy at a wavelength of 150. nm. The total amount of energy emitted by a carbon sample is 5.98 × 105 J. Calculate the number of carbon atoms present in the sample, assuming that each atom emits one photon.


2. An FM radio station broadcasts at 90.2 MHz. Calculate the wavelength of the corresponding radio waves.
i got 9.01 10^7 m

thanx

2007-11-13 12:39:32 · 1 answers · asked by My point exactly 5 in Chemistry

Does Intelligent Design deserve the title of "theory"? Is it based on observation, experimentation, and reasoning? Most importantly, can it be tested? Just curious to here what you all think...

2007-11-13 12:39:07 · 8 answers · asked by lnf127 2 in Other - Science