Science & Mathematics - 15 October 2007

A 30.5 g sample of an alloy at 93.2°C is placed into 47.0 g water at 21.6°C in an insulated coffee cup with a heat capacity of 9.2 J/K. If the final temperature of the system is 31.1°C, what is the specific heat capacity of the alloy?

2007-10-15 14:34:44 · 1 answers · asked by divastr186 2 in Chemistry

Honestly, I just need suggestions on sites to visit that help me with understanding buoyancy; calculating the weight of an object in a liquid if given the weight in air, calculating the weight of an object in a vacuum, etc.

Help is appreciated! Please and thank you.

2007-10-15 14:34:09 · 1 answers · asked by Anonymous in Chemistry

im having a blonde moment

2007-10-15 14:33:33 · 13 answers · asked by Anonymous in Mathematics

The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.039 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 0.059 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.

Find the final speed of puck A.


Find the final speed of puck B.

Here is the drawing

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

2007-10-15 14:32:54 · 1 answers · asked by yefimthegreat 1 in Physics

A 600 g steel block rotates on a steel table (μk = 0.6) while attached to a 1.0 m long hollow tube. Compressed air fed through the tube and ejected from a nozzle on the back of the block exerts a thrust force of 4.2 N perpendicular to the tube. The maximum tension the tube can withstand without breaking is 50 N. If the block starts from rest, how many revolutions does it make before the tube breaks?

2007-10-15 14:31:55 · 2 answers · asked by Anonymous in Physics

A 110 g ball on a 60 cm long string is swung in a vertical circle about a point 200 cm above the floor. The tension in the string when the ball is at the very bottom of the circle is 3.5 N. A very sharp knife is suddenly inserted, as shown in Figure P7.51, to cut the string directly below the point of support. Where does the ball hit the floor? (Measure from the point where the string was cut and consider right to be the positive direction.)

2007-10-15 14:31:21 · 2 answers · asked by Anonymous in Physics

What part of the earth is covered with water?1/4,1/2 or 3/4.

2007-10-15 14:31:01 · 9 answers · asked by Anonymous in Earth Sciences & Geology

A 28 g ball rolls around a 44 cm diameter L-shaped track, shown in Figure Ex7.16, at 60 rpm. What is the magnitude of the net force that the track exerts on the ball? Rolling friction can be neglected.

2007-10-15 14:30:23 · 2 answers · asked by Anonymous in Physics

Thank you...

2007-10-15 14:28:25 · 3 answers · asked by Anonymous in Mathematics

2007-10-15 14:25:51 · 2 answers · asked by blue_star 2 in Earth Sciences & Geology

2007-10-15 14:24:43 · 3 answers · asked by esha26 1 in Other - Science

2007-10-15 14:23:54 · 8 answers · asked by Tracy Y 1 in Mathematics

2007-10-15 14:23:45 · 5 answers · asked by sss_xxx300 1 in Mathematics

determine the elpased time?
the half-life of sodium-24 is 14.9 hours. a hospital buys 40mg of it. how long will it take for 2.5 mg to remain

so far i got up to this point in half-life equation

2.5=40(1/2)^t/14.9 or 2.5=40(1r2)^tr14.9

2007-10-15 14:21:10 · 1 answers · asked by inderjitvirk2001 2 in Chemistry

2007-10-15 14:20:44 · 13 answers · asked by Rob 2 in Zoology

What quantity did Millikan's oil drop experiment determine

2007-10-15 14:17:30 · 3 answers · asked by jeet x 2 in Chemistry

2007-10-15 14:16:48 · 3 answers · asked by deannahndrsn 2 in Physics

2007-10-15 14:15:14 · 2 answers · asked by Anoshe k 2 in Earth Sciences & Geology

2007-10-15 14:14:52 · 3 answers · asked by lil 1 in Geography

Two vectors have magnitudes V1 = 2.0 km and V2 = 4.5 km. What are the maximum and minimum magnitudes of their vector sum?
Maximum

Minimum

2007-10-15 14:14:44 · 2 answers · asked by Shawn Carter 1 in Physics

1. Where is the species from?
2. Where AND when was it introduced?
3. Was it introduced on purpose (explain why) or by accident?
4. Where can it be found today?

2007-10-15 14:14:09 · 3 answers · asked by Shayde Dracul 4 in Botany

2007-10-15 14:14:01 · 13 answers · asked by JOHN B 4 in Weather

2007-10-15 14:12:59 · 4 answers · asked by mary j 1 in Geography

I'm going in for this procedure, but the area will be numbed with a local anesthesia. I'll be in and out in about a hour. Is this considered a surgery?

2007-10-15 14:12:38 · 5 answers · asked by Abiku 6 in Medicine

how many degrees r there between the equator and the southern tip of greenland

2007-10-15 14:12:03 · 3 answers · asked by Anonymous in Weather

the graph of x^2 + xy + y^2 = 3 intersects the graph of x + xy + y + 1 = 0 in k distinct points. The value of k is .

2007-10-15 14:11:32 · 2 answers · asked by Anonymous in Mathematics

2007-10-15 14:11:29 · 23 answers · asked by asexymix 1 in Astronomy & Space

Determine d^2 y/dx^2 when 5x^2 + y^2 = 2

Anyone have the steps to this one?

Here are the choices
1. 10/y^2
2.- 10/y^3
3. -5/y^3
4.10/y^3
5. -10/y^2

2007-10-15 14:10:08 · 3 answers · asked by michelle 1 in Mathematics

2007-10-15 14:07:43 · 1 answers · asked by Anonymous in Mathematics

2007-10-15 14:06:35 · 7 answers · asked by Onika D 1 in Mathematics