Science & Mathematics - 29 October 2007

this is a algebra question

2007-10-29 05:18:42 · 9 answers · asked by Anonymous in Mathematics

2007-10-29 05:17:52 · 3 answers · asked by Anonymous in Geography

2007-10-29 05:15:22 · 16 answers · asked by Sunshine 1 in Chemistry

its a question to create a automatic machine

2007-10-29 05:14:24 · 1 answers · asked by LEO 1 in Engineering

A bicycle has wheels of radius 0.26 m. Each wheel has a rotational inertia of 0.095 kg·m2 about its axle. The total mass of the bicycle including the wheels and the rider is 77 kg. When coasting at constant speed, what fraction of the total kinetic energy of the bicycle (including rider) is the rotational kinetic energy of the wheels?

2007-10-29 05:11:46 · 2 answers · asked by Anonymous in Physics

2007-10-29 05:10:48 · 21 answers · asked by Anonymous in Astronomy & Space

Use the Maclaurin series for sin x to compute sin(2°) correct to five decimal places.

2007-10-29 05:10:13 · 1 answers · asked by sugardaddy8815 1 in Mathematics

2007-10-29 05:09:53 · 5 answers · asked by biskits mom 1 in Physics

I have five tokens with which I may enter into a daily competition.
As the question indicates, I may enter all five into a single draw on one day, or enter each individually into separate draws taking place every day for five days.

The temptation is to conclude that the odds are equal, but probability is rarely so obvious. =P

2007-10-29 05:09:19 · 7 answers · asked by subtext 3 in Mathematics

2007-10-29 05:05:03 · 4 answers · asked by . 2 in Astronomy & Space

The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.040 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.060 kg and is initially at rest. The collision is not head-on. After the collision, the two pucks fly apart with the angles shown in the drawing.


http://www.webassign.net/CJ/07_32.gif

2007-10-29 05:02:14 · 2 answers · asked by Jeff 4 in Physics

A tennis ball is thrown vertically upward with an initial velocity of +8.0 m/s.

What will the ball's speed be when it returns to its starting point? and how long will the ball take to reach its starting?

2007-10-29 04:59:35 · 3 answers · asked by Anonymous in Physics

2007-10-29 04:59:04 · 10 answers · asked by schming2005 1 in Zoology

integral (0,.5) cos x^2 dx (SHOW WORK) Give your answer correct to 3 decimal places.

2007-10-29 04:58:43 · 1 answers · asked by sugardaddy8815 1 in Mathematics

I am a junior in college pursuing my BS in Chemistry. I got a letter in the mail to join the American Chemical Society. I'm interested but I don't want to pay my money to join and never meet anyone in this Society. I want to meet other people already in the field. What are some sites or groups where I can do this?

2007-10-29 04:58:19 · 3 answers · asked by Anonymous in Other - Science

passes over a pulley and is then fastened to a hanging object with mass m2=10.0kg. Find the acceleration of each object and the tension in the cable.

2007-10-29 04:57:54 · 1 answers · asked by mary s 1 in Physics

Many times, when I sit in front of a mirror, I cast my shadow on top of it, but when I notice the objects that are reflected on the mirror, there is no shadow on them. How can this happen?

2007-10-29 04:51:03 · 3 answers · asked by Buzz - Darwindidit 6 in Physics

A 20.0kg- projectile is fired at an angle of 60.0 above the horizontal with a speed of 80.0 m/s. At the highest point of its trajectory, the projectile explodes into two fragments with equal mass, one of which falls vertically with zero initial speed. You can ignore air resistance.How far from the point of firing does the other fragment strike if the terrain is level?
How much energy is released during the explosion?

2007-10-29 04:49:27 · 3 answers · asked by Natiphy2007 1 in Physics

In this lab, we couldn't make a short circuit so we were instructed to measure the Vout for different load resistances (20ohm,30ohm,50ohm, etc) How does that help me find Rth. From those two values, I'm supposed to calculate Rth for each.

oh and Vth = sin(2*pi*1000t)

the only other equation i have is from using a voltage divider on the circuit and getting Vout = Vth(Rload/Rload+Rth)

2007-10-29 04:47:47 · 2 answers · asked by Anonymous in Engineering

2007-10-29 04:41:17 · 3 answers · asked by Tim M 1 in Physics

http://tinypic.com/view.php?pic=2dlvhmw&s=2

Click the link to see the picture and multiple choice

*5 stars to the person that gets this question right* :)

2007-10-29 04:36:35 · 5 answers · asked by Anonymous in Mathematics

2007-10-29 04:34:50 · 5 answers · asked by paula 1 in Mathematics

PLEASE HELP ME!!!!!!!

2007-10-29 04:31:46 · 4 answers · asked by mrjmiller21 1 in Physics

A. is conserved only if the enviroment is frictionless
B. definetly not conserved
C. definetly is conserved
D. is conserved only if the collusion is elastic

2007-10-29 04:29:58 · 5 answers · asked by MeDIGURU 1 in Physics

Here's a question on ray optics.

We say that the focal length of a lens is half times the radius of curvature, right. Now, consider any lens(say convex), made of any material(say glass). Now a beam of light parallel to the principle axis, passes through the lens. All the rays in the beam will converge at a point, which we call the focus. For now, let us assume that the focal length of this particular lens is half time the radius of curvature of the lens. Now, take another lens whose structure is identical to that of the previous lens, i.e., it has the same radius of curvature and everything, the only difference being that this time the lens is made of a material that is denser than that of the previous lens. This time, if we pass a beam of light parallel to the principle axis through the lens, all the rays in the beam will converge at a different focus, with focal length shorter than that in case of the previous lens. So, we can see that, 2F is not=R.PLEAZZZZZZ COMMENT

2007-10-29 04:24:11 · 4 answers · asked by Anonymous in Physics

5x^2+12x-9

I just need help understanding how you use the middle and the signs...

2007-10-29 04:21:53 · 7 answers · asked by It's a girl due 5/11/09 4 in Mathematics

2007-10-29 04:21:26 · 14 answers · asked by Alphonso A 1 in Astronomy & Space

How far down does a hole need to go to reach a hot molten area? (I do realize it may depend on where you start digging.)

I have previously heard that it gets very hot in the lower levels of mines. Is this due to the fact that they are approaching the bottom of the crust and the magna areas? What is the outlook on using this heat energy and a renewable energy source?

Sorry this is really four questions in one.

2007-10-29 04:21:07 · 3 answers · asked by BR 3 in Earth Sciences & Geology

to x or y, then find the area of the region.

i have no idea how to even start this problem if you could explain thatd be great! thanks!

2007-10-29 04:20:35 · 2 answers · asked by Anonymous in Mathematics

A mine car, whose mass is 510 kg, rolls at a speed of 0.5 m/s on a horizontal track, as the drawing shows. A 150 kg chunk of coal has a speed of 0.60 m/s when it leaves the chute. Determine the velocity of the car/coal system after the coal has come to rest in the car.

tried this solution, but it doesnt work, any ideas?

m1V1 + m2V2=(m1+m2)V3

V3= (m1V1 + m2V2)/(m1+m2)
V3=(510 x 0.5 + 150 x 0.60)/(510 + 150)
V3=0.52 m/s

2007-10-29 04:19:24 · 1 answers · asked by Jeff 4 in Physics