Science & Mathematics - 12 February 2007

1. point A moves along a unit circle at the rate of 2 units/second counterclockwise. What is the rate of change of the perimeter of the triangle whose vertices are points A, B(1,0) and C(-1,0) when A is at the point with coordinate (1/2, (sqrt3)/2).

2007-02-12 19:17:35 · 5 answers · asked by Sammy Baby 1 in Mathematics

i heard it's fake

2007-02-12 19:15:37 · 15 answers · asked by Icey Ling 2 in Astronomy & Space

Always T or can be F.

A) During the collision of a car with a large truck, the car exerts a lesser force on the truck than the truck exerts on the car.

False, equal and opposite forces.

B) The net force which acts on an object which maintains a constant velocity is zero.

True, if F=ma and (a) due to constant velocity = 0, then F=0.

C) If a net force acts on an object, the object's speed will change.

False, what if the F is downward on a still box? The speed is the same but the F is different.

D) If two objects have the same acceleration, they are under the influence of equal forces.

False, one object could have a greater mass, therefore a larger force would have to be applied to get the same accel.

E) A bicycle initially moving at a constant velocity will slow down unless a small net force is applied.

I don't know what this question is saying


F) An object's velocity will change if a net force acts on the object

False? Same reason as a still box?

2007-02-12 19:15:06 · 5 answers · asked by Anonymous in Physics

2007-02-12 19:10:05 · 5 answers · asked by nilamkura 2 in Engineering

2007-02-12 19:09:54 · 3 answers · asked by Normefoo 4 in Biology

2007-02-12 19:09:53 · 5 answers · asked by veezee1 1 in Zoology

How does this work if the earths wobble cycles every 21,000 years?
How do we get the seasonal change?

2007-02-12 19:06:10 · 6 answers · asked by Anonymous in Astronomy & Space

A 4.30 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=11.90 N at an angle theta=19.5o above the horizontal, as shown. What is the speed of the block 5.90 seconds after it starts moving?

I know you're supposed to treat x and y seperately so I found the adjacent side of the tension which was 11.9 cos 19.5 = 11.2, and the opposite side which was 4.02. 4.30kg*9.8 = 42.14 N as the Normal force/gravity.

y = 42.24 - 4.02 = 38.12 N
x = 11.12 N?

Fnet = ma so (38.12+11.12) = 4.3(a)

I don't see how this could turn into speed unless I found the acceleration from this, which is too high and multiplied it by the seconds (5.9) to get m/s. please help!

2007-02-12 19:05:53 · 3 answers · asked by Anonymous in Physics

2007-02-12 19:00:29 · 9 answers · asked by gixxer9 1 in Earth Sciences & Geology

Is there another form of power that we dont know about?

2007-02-12 18:59:33 · 2 answers · asked by decodapup 1 in Earth Sciences & Geology

2007-02-12 18:59:26 · 2 answers · asked by Anonymous in Botany

So, my prof hasn't really taught us much (as in, virtually nothing) about triangles inscribed in circles....

Triangles ABC and DEF are inscribed in a common circle, while angle A = angle D and angle B = angle E. Prove the triangles are congruent.

Any/some help would be greatly appreciated!

2007-02-12 18:56:51 · 4 answers · asked by yogastar02 2 in Mathematics

I have a factory in Indonesia and have just received a large order and have limited time to produce.I have to dry 100 cube of timber in various widths.We have to acheive an MC of between 10/12%

2007-02-12 18:55:37 · 4 answers · asked by RICHARD H 1 in Engineering

A circular logo is enlarged to fit the lid of a jar. The new diameter is 50 per cent larger than the original. By what percentage has the area of the logo increased?

A. 50
B. 80
C. 100
D. 125
E. 250

2007-02-12 18:52:20 · 7 answers · asked by becckkeeeme 1 in Mathematics

2007-02-12 18:50:29 · 3 answers · asked by gixxer9 1 in Earth Sciences & Geology

The reason I ask is because I had a shoebox full of quarters stolen by a moving company. I am trying to figure out how much it was to make a claim.

2007-02-12 18:49:54 · 3 answers · asked by Chris 2 in Other - Science

I decided to use fiberglass as the body panel of my racing car, how/why it would be the best material?

2007-02-12 18:49:38 · 3 answers · asked by noel 1 in Engineering

How can this be?

2007-02-12 18:47:51 · 4 answers · asked by icarusf1ying 5 in Physics

2007-02-12 18:45:59 · 6 answers · asked by bobbo2582 1 in Mathematics

a destitute home in kolkatta
the news name of Park street in kolkatta
the annual festival of the Missionaries of Charity
a bengal film made on the life of mother teresa

2007-02-12 18:43:24 · 1 answers · asked by surender kaswan rajasthani jat 1 in Engineering

Attempt to determine the density of the unknown from the following data:

Mass of dry pycnometer & stopper : 32.4245g
Mass of pycnometer + stopper + H2O: 58.0558g
Temp. of H2O: 23.0°C
Mass of pycnometer + stopper + unknown liquid: 52.8734g

(a) Find density of H2O @ 23.0°C.
(b) Calculate the volume of the pycnometer.
(c) Determine the density of your unknown liquid.

2007-02-12 18:39:06 · 1 answers · asked by Jay 2 in Chemistry

A box of volume 384 cubic feet having a square base and no top is to be constructed from material costing $3 per square foot for the base, and $1 per square foot for the sides. Find the dimensions that would cost the least.

2007-02-12 18:39:06 · 2 answers · asked by Christina C 1 in Mathematics

what's the limit as x approaches infinity when

x/(ln(1+2e^x))

2007-02-12 18:37:49 · 7 answers · asked by Anonymous in Mathematics

what is the wind direction along the east coast region that in pondicherry? it is from south west to northeast or southeast to northwest.

2007-02-12 18:37:36 · 3 answers · asked by sandiyar 8 1 in Weather

How do you perform/what is the equation for the sum of squares?
Example: Factor x^2+y^2

Also, factor x^2-5x+15

2x^2-8x+5

6pr^2 - pw^2 - 3rw + 2p^2rw

a^2bc - ab^2d + ac^2d - bcd^2

2007-02-12 18:31:55 · 3 answers · asked by Wha??????? 1 in Mathematics

2007-02-12 18:30:50 · 4 answers · asked by archna k 1 in Astronomy & Space

1.looking at the map of africa, what can we say about th elevation of sub sahara africa? how does this affect the coastal region?

2. consider for a moment how it might be to govern th philippines. what kinds of difficulties may you encounter?(look at thier current situation

3.looking at the ocean floor profile drawn along the equater,what can we safely deduct about the land area as compared to the ocean expanse?

4. what does location tell us about a place?descibe two ways we veiw location geographically.
A.
B.

5.what characteristics of a place do we consider?describe each
A.
B.

6.why is the study of geography so important today?

7.why is human-invirment such an important part of geography

8.what regional characteristics can we determine from a photograph of western sonoma?

9.the earth is a dynamic place. explain this state ment.

10. who was alfred wegener, and what was his important contribution to our understanding of the earths past history

2007-02-12 18:26:54 · 5 answers · asked by Anonymous in Geography

really "did all that without outside help".

Whadda you think??

2007-02-12 18:26:20 · 2 answers · asked by charly 3 in Astronomy & Space

victory margin in lok shabba election ?
sharad yadav
ram villas paswan
l.k. advani
jyotriaditya scindia

2007-02-12 18:25:28 · 1 answers · asked by surender kaswan rajasthani jat 1 in Engineering

2007-02-12 18:25:26 · 2 answers · asked by Anonymous in Zoology