Physics (Science & Mathematics) - September 2006

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can the train be stopped in time?

A train of mass 55,200 kg is traveling along a straight level track at 26.8 m/s (60.0 mi/h). Suddenly the engineer sees a truck stalled on the tracks 184 m ahead. If the maximum possible braking force has magnitude 84.0 kN, can the train be stopped in time?

No; it takes 236 m for the train to stop.
Yes; it takes 52 m for the train to stop.
No; it takes 1180 m for the train to stop.
No; it takes 184 m for the train to stop.

2006-09-13 06:09:11 · 3 answers · asked by Anonymous

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What is the tension in the rope and the horizontal force exerted on the ground?

In a tug-of-war between two athletes, each pulls on the rope with a force of 999 N. What is the tension in the rope? What is the absolute value of the horizontal force that each athlete exert against the ground?

2006-09-13 06:06:07 · 4 answers · asked by Anonymous

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John is chucking pebbles gently up to Juliet's window, and he wants the pebbles to hit the window?

with only a horizontal component of velocity. He is standing 4.5 m below her window and 5.0 m from the base of the house. How fast are the pebbles going when they hit the window???

2006-09-13 05:55:49 · 3 answers · asked by bulldawg771 1

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Why don't Scuba Divers get crushed by all of that water above them?

If that same volume of water was ice, they'd surely be dead as they wouldn't be able to cope with the weight, but why is this not the case when totally submerged in water.

2006-09-13 05:55:07 · 21 answers · asked by Anonymous

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why is your shadow always black ?

i just wondering; no matter what color you wear, your shadow is always in black?

2006-09-13 05:14:47 · 11 answers · asked by btribuwono 1

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how many experiments did Edison perform before inventing the electric bulb?

2006-09-13 05:06:35 · 8 answers · asked by sabi 2

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why dont birds get electricuted when they sit on electric cables?

2006-09-13 04:58:54 · 34 answers · asked by Floyd1970 1

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How does a boomerang work?

2006-09-13 04:57:40 · 22 answers · asked by Ian F 1

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What is Ultra Violet light?

2006-09-13 04:56:49 · 7 answers · asked by Ian F 1

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Why can't you fold a piece of paper, no matter how big, more than 8 times. try it for you're self?

2006-09-13 04:48:33 · 10 answers · asked by Floyd1970 1

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draw acceleration-mass graph keeping the force constant?

2006-09-13 04:48:27 · 7 answers · asked by kanishk y 1

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a man while drawing water from a well,falls backward when the rope breaks .why?

2006-09-13 04:42:06 · 21 answers · asked by ARSHAD K 1

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physics lovers?

A train is traveling up a 4.6° incline at a speed of 3.00 m/s when the last car breaks free and begins to coast without friction.

How long does it take for the last car to come to rest momentarily?

How far did the last car travel before momentarily coming to rest?

2006-09-13 04:21:28 · 3 answers · asked by otsatsa3 2

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Why do hot drinks get cold when you blow on them?

I can't see how it would be conduction, convection or radiation.

I've tested it and the drop in temperature is significant over tea not blown over.

2006-09-13 04:06:22 · 16 answers · asked by Anonymous

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Is Light Heavy?

I remember being told at school that light was a wave ( a form or energy) and so does not have mass like particles do.

I know that light can be bent by gravity but gravity can only effect anything that has a mass. So does that mean that light too has an associated mass, however minuscule?

2006-09-13 03:54:15 · 18 answers · asked by MoJo JoJo 1

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