Physics - June 2007

2007-06-14 00:31:08 · 17 answers · asked by leslie w 1

2007-06-14 00:11:38 · 5 answers · asked by godsadvocate 5

I belong to a paranormal site and was wondering what some thought about ghosts, paranormals or apparitions and such forming shadows?

2007-06-14 00:00:56 · 8 answers · asked by Anonymous

can you please give me an answer or a link where i can get the answer of that question.. i'm really desperate.. it's my first semester taking Physics and now i'm stuck with this homework that i can't finish.. any answer will be appreciated..

2007-06-13 23:53:13 · 7 answers · asked by trish010 3

2007-06-13 21:57:51 · 6 answers · asked by vinson_30 1

2007-06-13 21:55:43 · 4 answers · asked by lorlipop 2

Please tell in brief.

2007-06-13 21:43:04 · 4 answers · asked by Anonymous

A cylindrical brass rod (cross-sectional area = 1.20 x 10-5 m2) hangs vertically straight down from a ceiling. When a 790-N block is hung from the lower end of the rod, the rod stretches. The rod is then cooled such that it contracts to its original length. By how many degrees must the temperature be lowered?

2007-06-13 20:56:56 · 1 answers · asked by Rajiv L 1

A certain automobile can decelerate at |a1| = 1.8 m/s2. Traveling at a constant v1 = 31 m/s, this car comes up behind a car traveling at a constant v2 = 10 m/s.

1) How close to the slower car can the driver of the faster car come before applying his brakes and still avoid a collision?

2) Unfortunately, the driver of the faster car does not apply his brakes until he is just 30 m behind the slower car! Call the instant at which he applies the brakes t = 0.
-------At what time does the inevitable collision of the two cars occur?

3) How far beyond its position at t = 0 does the slower car get before it is hit?

2007-06-13 19:28:25 · 1 answers · asked by stillpoker 1

2007-06-13 18:16:43 · 5 answers · asked by phuket8166 1

"Vector A has x and y components of -8.70 cm and 15.0 cm, respectively; vector B has x and y components of 13.2 cm and -6.60 cm, respectively. If A-B+3C=0, what are the components of C."

Am I doing this correctly??? I know that one normally groups the x and y components of each vector into i hat and j hat to add them...so, if it were just asking what A+B is equal to , I would (-8.70+13.2)i hat+(15.0+(-6.60))j hat to get 4.5i hat+8.9 j hat. Since there is now this 3C component, do I just set 3C=-4.5 to get -1.5 & 3C=-8.9 to get -2.97, or this just totally wrong??? Would my final answer be for Vector C that x=-1.5 and y=-2.97???

Thanks!!

2007-06-13 16:30:03 · 2 answers · asked by Anonymous

2007-06-13 16:16:38 · 16 answers · asked by kenneth j 1

A circus performer is shot out of a cannon and flies over a net that is placed horizontally 5.3 m from the cannon. When the cannon is aimed at an angle of 30° above the horizontal, the performer is moving in the horizontal direction and just barely clears the net as he passes over it.

2007-06-13 15:59:46 · 3 answers · asked by terra_flare_aqua_ciel 1

Im dealing with this question..

What speed would a clock have to be moving so time dilation would cause it to run slower by 50%?

Im kind of confused on how to take the approach to this question, Im not sure how to take the speeds of them. Any help of this would be greatly appreciated.

2007-06-13 15:53:15 · 7 answers · asked by Anonymous

2007-06-13 15:17:26 · 6 answers · asked by Anonymous

using the law of falling bodies,gravity,mass,surface area, and air, resistnace. Would an elephant fall faster than a mouse?

2007-06-13 15:07:52 · 6 answers · asked by greenlane 2

a.wavelength
b.temperature
c.pressure.
d.frequency.

2007-06-13 14:55:14 · 3 answers · asked by GraceFace 1

2007-06-13 14:46:21 · 3 answers · asked by hopebob13 1

If a plane was shot down from 35,000 feet, how long will it take to hit the ground?

2007-06-13 14:39:37 · 3 answers · asked by Jill knows best 4

what affect does mass, surface area, and air resistance have on the rate at which an object falls?

2007-06-13 14:33:38 · 10 answers · asked by greenlane 2

a. they will reflect off each other and reverse their direction
b.they will cancel out, leaving no pulses in the rope
c.they will combine to porm a pulse of twice the amplitude
d.they will pass through each other.
e.they will combine to form a standing wave

2007-06-13 14:23:55 · 5 answers · asked by GraceFace 1

2007-06-13 14:04:21 · 2 answers · asked by Anonymous

2007-06-13 13:55:11 · 6 answers · asked by Anonymous

2007-06-13 13:49:51 · 3 answers · asked by Anonymous

A cue ball (mass = 0.165 kg) is at rest on a frictionless pool table. the ball is hit dead center by a pool stick, which applies an impulse of 1.50 N.s to the ball. the ball then slides along the table and makes an elastic head on collision with a second ball of equal mass that is intially at rest. find the velocity of the second ball just after it is struck.

2007-06-13 12:57:51 · 2 answers · asked by Anonymous

On a frozen pond, a 10kg sled is given a kick that imparts an initial speed of 2m/s, the coefficient of kinetic friction between sled and ice is .10.
a. find the distance the sled moves before coming to rest.
b. the mechanical energy lost due to friction

2007-06-13 12:26:20 · 2 answers · asked by john l 1

I would like to make a variable resistor that I can adjust from about 100 ohms to 1 million ohms.

Can someone draw up a circuit diagram for this?

2007-06-13 11:18:29 · 3 answers · asked by John Java Smith 2

2007-06-13 10:44:13 · 5 answers · asked by John K 1

The gravitational constant is 6.67300 × 10-11 m3 kg-1 s-2.
What if it was instead 6.0 or 7.0 × 10-11 m3 kg-1 s-2... how would life on Earth be any different? Would life as we know it even be sustainable?

2007-06-13 10:24:50 · 9 answers · asked by Anonymous

I'm using 2 circuits, one with 3 LEDs and one with 4 LED's. Led's are rated at 2.6v, 70ma. LED's will be wired in series. Power source is ~13.8v.

Circuit 1
3LEDs in series connected to a 82ohm 1w resistor and a 6.8ohm 1w resistor (resistors in series).

Circuit 2
4LEDs in series connected to a 51ohm 1/2w resistor and a 1.3ohm 1/2w resistor (resistors in series).

Will these give me nominal voltage and current?

2007-06-13 10:16:38 · 4 answers · asked by slickwilly 2