Physics - June 2006

2006-06-28 20:27:55 · 29 answers · asked by dragosanti 1

So we all know no one knows what SHC is or works, but how can heat so intense it can vaporize flesh and turn bone be contained within a space so small that it somehow does not even burn up the extremeties of the body?

I've seen pics of SHC where a charred body would have vaporized while sitting on a couch, yet the couch is miracolously untouched and the limbs and head are unburned, even some clothing is intact. How can such an intense heat not spread so far that it combusts the entire room as well?

2006-06-28 19:46:56 · 2 answers · asked by Alex M 1

A small rock with a mass of 0.300 kg is released from rest at point A, which is at the top edge of a large, hemispherical bowl with a radius R = 0.560 m View Figure . Assume that the size of the rock is small compared to the radius of the bowl, so that the rock can be treated as a particle, and assume that the rock slides rather than rolling. The work done by friction on the rock when it moves from point A to point B at the bottom of the bowl is - 0.290 J.
What is the speed of the rock when it reaches point B? g = 9.81 m/s^2 for the acceleration due to gravity.

2006-06-28 19:45:21 · 6 answers · asked by Ronaldinho G 1

When its engine of power 75.0 kW is generating full power, a small single-engine airplane with mass 690 kg gains altitude at a rate of 2.10 m/s.
What fraction of the engine power is being used to make the airplane climb? (The remainder is used to overcome the effects of air resistance and of inefficiencies in the propeller and engine.)
g=9.80, express answer as a percentage

2006-06-28 19:37:17 · 8 answers · asked by Ronaldinho G 1

according to einstien's theory of relativitywhen a body travels at the speed of light,the mass becomes infinity ,but from where does it get the mass for it to become infinity

2006-06-28 19:24:17 · 13 answers · asked by madhu v.g 3

And what is an apogee? And how high can a bullet go that is shot straight up in the sky? What could happen when it comes down? The best answer will site resources.

2006-06-28 19:18:14 · 22 answers · asked by LaineeTheCat 2

Apparent Weight. A physics student weighing 600 N stands on a bathroom scale in an elevator. As the elevator starts moving, the scale reads 400 N.Find the magnitude of the acceleration of the elevator.
Take the free fall acceleration to be g = 9.80 m/s^2.

What is the magnitude of the acceleration if the scale reads 650 N? What direction is acceleration, down or up ?

2006-06-28 19:07:36 · 6 answers · asked by Raquelme 1

2006-06-28 19:06:02 · 2 answers · asked by Lisa O 2

2006-06-28 19:04:01 · 1 answers · asked by Anonymous

An adventurous archaeologist crosses between two rock cliffs by slowly going hand-over-hand along a rope stretched between the cliffs. He stops to rest at the middle of the rope . The rope will break if the tension in it exceeds 2.45×104 N, and our hero's mass is 82.2 kg. The angle of the rope bent by the person in the middle to the horizontal holding it together forms a triangle.

If the angle between the rope and the horizontal is
theta = 11.9 degrees, find the tension in the rope.
Take the free fall acceleration to be g = 9.80 m/s^2.

What is the smallest value the angle (theta) can have if the rope is not to break?
Take the free fall acceleration to be g = 9.80 m/s^2.

2006-06-28 19:03:13 · 6 answers · asked by Raquelme 1

2006-06-28 18:46:05 · 5 answers · asked by beibi anghell 1

World-class sprinters can accelerate out of the starting blocks with an acceleration that is nearly horizontal and has magnitude 15.0 m/s^2.

How much horizontal force must a sprinter of mass 61.0 kg exert on the starting blocks during a start to produce this acceleration?

Which body exerts the force that propels the sprinter, the blocks or the sprinter herself?

2006-06-28 18:38:25 · 3 answers · asked by GUVNA? 1

A box rests on a frozen pond, which serves as a frictionless horizontal surface.

If a fisherman applies a horizontal force with magnitude 54.0 N to the box and produces an acceleration of magnitude 3.40 m/s^2, what is the mass of the box?

2006-06-28 18:36:28 · 1 answers · asked by GUVNA? 1

A television picture in the United States is composed of 525 "lines" wich sweep across the face of the picture tube. These lines represent the path of an electron beam wich sweeps out these 525 lines every 1/30 of a second. If the horizontal dimension of the picture is 20 inches (50.8cm), how fast must the beam travel? (The beam must sweep back across the screen to start a new line, but assume that the time for this re sweep.) express your answer in ft/sec and miles/hr (or m/sec and km/hr).

2006-06-28 18:36:26 · 2 answers · asked by best 1

A car of weight 1×104 N car comes to a bridge during a storm and finds the bridge washed out. The driver of weight 650 N must get to the other side, so he decides to try leaping it with his car. The side the car is on is 20.9 m above the river, while the opposite side is a mere 1.90 m above the river. The river itself is a raging torrent 52.0 m wide.

How fast should the car be traveling just as it leaves the cliff in order just to clear the river and land safely on the opposite side?
Take the free fall acceleration to be g = 9.80 m/s^2.

What is the speed of the car just before it lands safely on the other side?
Take the free fall acceleration to be g = 9.80 m/s^2.

2006-06-28 18:27:06 · 7 answers · asked by GUVNA? 1

2006-06-28 17:53:24 · 11 answers · asked by michael B 1

I read some research recently stating that the interior temperature between a white vehicle, and black vehicle, aren't that different.

2006-06-28 17:34:39 · 14 answers · asked by A A 3

2006-06-28 17:08:22 · 10 answers · asked by Anonymous

1) Under what conditions would acceleration be different from the "rate of change of speed"?
2)Under what conditions could an object continue to travel at a constant speed and yet be accelerated?
3)A ball is thrown straight up and is observered to come straight down. How does the acceleration of the falling ball compare to its acceleration on the way up? What is the acceleration at the very peak of the motion when its velocity is zero?
4)What would happen to the height, acceleration, return velocity, and time of flight of a vertically thrown ball if its initial upward velocity was doubled?

2006-06-28 16:58:30 · 9 answers · asked by Anonymous

2006-06-28 16:44:07 · 5 answers · asked by just_curious 1

I seem to be interested in physics, but I am not sure about employment and demand for physicists. I am still a high schooler and am not sure of what career to pursue. What kinds of employers look for physicists? Do they also get good pay?Bachelor, Masters, or P.h.d.?

2006-06-28 16:28:20 · 5 answers · asked by Anonymous

2006-06-28 16:00:36 · 4 answers · asked by withallthesethings 4

You push your physics book a distance 1.41 m along a horizontal tabletop with a horizontal force of 2.34 N. The opposing force of friction is 0.550 N.

How much work does your force 2.34 N do on the book?

What is the work done on the book by the friction force?

What is the total work done on the book?

.

2006-06-28 15:35:29 · 3 answers · asked by Anonymous

At the surface of Jupiter's moon Io, the acceleration due to gravity is 1.81 m/s^2. A watermelon has a weight of 57.0 N at the surface of the earth. In this problem, use 9.81 m/s^2 for the acceleration due to gravity on earth.

what is its mass on the earth's surface?

What is its mass on the surface of Io?
\
What is its weight on the surface of Io?

2006-06-28 15:29:21 · 3 answers · asked by Anonymous

in terms of physics

2006-06-28 15:22:49 · 7 answers · asked by Anonymous

This is in relation to the question on how much hydroelectricity can be generated. so basically if I can generate 1 hp, what should that be in VoltAmpere?

Thanks

2006-06-28 15:11:02 · 3 answers · asked by hydroelectricity 1

I am looking to see if there is a mathematical equation to tell how high a baseball travels into the air when hit. I am sure that it depends on the angle of the ball (where is lands) in relation to home plate and obviously how long it is in the air. What about an equation for a ball that goes straight up in the air? If someone throws a ball straight up in the air? Any insight would be appreciated from. Thank you.

2006-06-28 15:02:13 · 3 answers · asked by Eric 1

What are they and how would they work???
What would they be in order of cheapest to most expensive???
Also, please explain each of them. :)

And what type of energy source could we be using in the future to run our cars, trucks, aircraft etc etc???

2006-06-28 14:32:41 · 15 answers · asked by Zorro 3

Three identical masses of 390 kg each are placed on the x-axis. One mass is at x_1 = −11.0 cm, one is at the origin, and one is at x_2 = 39.0 cm.
What is the magnitude of the net gravitational force on the mass at the origin, due to the other two masses???
Take the gravitational constant to be G = 6.67×10^−11 N*m^2/kg^2.

best answer is the most explanatory one

2006-06-28 13:42:20 · 5 answers · asked by Anonymous

The typical adult human has a mass of about 70.0 kg.

What force does a full moon exert on such a human when it is directly overhead with its center a distance 3.86×10^5 km away?
Take the gravitational constant to be G = 6.67×10^−11 N*m^2/kg^2, and the mass of the Moon to be 7.35×10^22 kg.

thanks

2006-06-28 13:31:59 · 10 answers · asked by Conscious 1