Physics - December 2006

Why is the sum of the forces on colliding objects zero? (momentum is conserved)

2006-12-10 07:54:48 · 1 answers · asked by Anonymous

As a truck moves across a bridge, the downward force due to its weight
(a)acts against both supporting piers
(b)is parallel to the upward forces exerted by the piers
(c)remains equally divided between the two piers
(d)is parallel to the weight of the bridge itself
please explain how u got the answer.

2006-12-10 07:47:18 · 2 answers · asked by Fatima 1

A 2200μF capacitor is charged to a potential difference of 6.0V in 3.2s. Calculate the average charging current and the energy stored by the capacitor.

2006-12-10 07:45:13 · 1 answers · asked by dalman99uk 2

A cat is chasing a mouse. The mouse runs in a straight line at a speed of 1.5 m/s
.If the cat leaps off the floor at a 30 degree angle and a speed of 4.0 m/s, at what distance behind the mouse should the cat leap in order to land on the poor mouse?

2006-12-10 07:43:21 · 1 answers · asked by MattS 1

Two trees are 7.6m apart. Calculate the mafnitude of the force F a backpacker must exert to hold a 16kg backpack so that the rope sags at its midpoint by:

A. 1.5m

B. 0.15m

2006-12-10 07:36:11 · 1 answers · asked by Shane W 1

i'm struggling with this question for some reason..

Why is Kinetic Energy conserved in an elastic collision and not an inelastic one?

2006-12-10 07:26:52 · 1 answers · asked by twiztid642 1

2006-12-10 07:26:39 · 17 answers · asked by Anonymous

Explain why ultrasound can be used to make an image of soft tissues, while X-rays are used to make images of hard tissues.

2006-12-10 07:06:08 · 1 answers · asked by Anonymous

Or is there no question that science cannot answer? If there are limits, what are they?

2006-12-10 07:03:05 · 8 answers · asked by lostprophetslove 1

My boss asked me this the other day and it got me thinking. Everything has to go somewhere when it's taken away. So where does light go if turn a light switch off? It can't just disappear can it? Seriously, where can it go? Is it the real magic or is it just to scientific for anybody to care about? I'd like to know what everyone thinks. All answers are appreciated and will be greatly appreciated. Thanks to all who answers.

2006-12-10 06:58:07 · 5 answers · asked by matthewsisk_2001 1

I have a graph which corresponds to pulling a spring a series of distances. The slop is positive.

Why is the slop of your graph positive, while Hooke's law has a minus sign? (F= -k x) <

2006-12-10 06:27:03 · 5 answers · asked by classicrockrox 3

2006-12-10 06:25:54 · 6 answers · asked by krish s 1

2006-12-10 06:24:25 · 4 answers · asked by Anonymous

like the top speed or the angle/speed ratio.

2006-12-10 06:09:00 · 4 answers · asked by cozmo_connor 1

I do believe Big Bang itself is just a cover up theory which made up by politicans and physicians to keep working on nuclear weapon projects without getting too much negative public reaction. Einstein promised us to find the secrets of the universe with his projects years ago; but all we've ever seen was a 15kiloton blast over japan after all that banging theories we've been fooled with.
Now once again we have scientists talking about getting close to god and all this non-sense. 10 billion dollars on one underground project. After almost 50 years Nobel Physics Award went to two ''Big Bang theorists'' this year. All seems like a repeat of what has already happened before. Do you think this experiment and the results will starts just another cold war between US and the west? Do you think we can affort another proof that bangs dont create, they destroy!

2006-12-10 05:57:20 · 1 answers · asked by who_knows 2

what do we know abou it?

2006-12-10 05:38:10 · 2 answers · asked by Anonymous

2006-12-10 05:27:02 · 3 answers · asked by dominique m 1

Mismas, one of Saturn's moons, has an orbital radius of 1.87 * 10^8 meters and an orbital period of about 23.0 hours. Use Newton's version of Kepler's third law to find Saturn's mass.

Please help me with this problem.
I'm having trouble understanding it.

2006-12-10 05:24:36 · 2 answers · asked by swimmertommy 1

2006-12-10 05:14:11 · 2 answers · asked by Anonymous

How long would it take to fall to earth and hit the ground?Strange question i know but it suddenly interests me.

2006-12-10 05:13:40 · 9 answers · asked by dope 1

Can some1 explain? Thanks
A 15 gram bullet is fired horizontally into a block of wood with a mass 2.5 kg and embeded in the block. Initally the block of wood hangs vertically and the impact causes the block to swing so that its center rises 15cm . Find the velocity of the bullet just before the impact?

2006-12-10 05:03:00 · 1 answers · asked by twistoffate2099 4

a laundry basket of mass 3kg is being pulled by rope inclined at 30 degrees. tension in the rope = 8N. find the coefficient of friction when the acceleration is o.2 ms-2

2006-12-10 05:00:24 · 4 answers · asked by Leonidus 2

I doubt anyone will be able to answer this but posting just the same.
From time immemorium, my ice cubes have been nondescrpt. Sometimes clear, sometimes cloudy, depending on the temp of the water when I started. Tap water. Cubes are usually flat, extend to the edges of the tray. Pretty normal.
Since I have moved my ice cubes are deformed! They are now round on top and shrunken away from the sides, loose in the trays.

At first I assumed it was The Ice God but I am a Catholic anfd we dont do alternate God thinger. So of course I thought Ice Angels. Now I am thinking Ice Faeries.

I throw it to the physics folks: why are my ice cubes rounded and shrinking?

2006-12-10 04:59:25 · 4 answers · asked by eddie9551 5

I'll be grateful for a detailed explanation based on physics.

2006-12-10 04:52:35 · 2 answers · asked by wisdom tooth 3

2006-12-10 04:48:45 · 9 answers · asked by rosalina c 2

2006-12-10 04:34:47 · 0 answers · asked by starbucksluvrxoxo 3

why (in terms of forces)?

2006-12-10 04:20:24 · 5 answers · asked by corlears56 1

the truth answer is yellow (according to the quiz master's answer), but according to physics' theory, it's black since red light will be absorbed by green things. i didn't get to experiment it myself.

is this question related to biology and chemistry, beside physics, since it involves the 'leaf'?

please explain in detail.

i'm dying for an explaination. thanks. ^_^

2006-12-10 04:05:47 · 7 answers · asked by bluewater 2

2006-12-10 03:54:55 · 9 answers · asked by Halidha Fathima M 1

newtons 3 rd law states the forces will be equal and opposite then why the ball is going in the same direction the bat hit it ? when it has to go the reverse direction.

2006-12-10 03:48:26 · 11 answers · asked by smart g 1