Science & Mathematics - 28 June 2006

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

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 in Physics

2006-06-28 19:00:55 · 8 answers · asked by amethyst g 1 in Biology

2006-06-28 18:54:22 · 3 answers · asked by phantomrealm 2 in Biology

why this earth only hanging in the space but not falling down

2006-06-28 18:53:43 · 14 answers · asked by tony t 1 in Earth Sciences & Geology

2006-06-28 18:52:27 · 7 answers · asked by one_kama_prod 1 in Earth Sciences & Geology

...by a shark?

2006-06-28 18:52:20 · 4 answers · asked by Bonethuggg 2 in Geography

2006-06-28 18:50:14 · 5 answers · asked by Bonethuggg 2 in Weather

2006-06-28 18:48:53 · 8 answers · asked by Anonymous in Other - Science

2006-06-28 18:48:04 · 14 answers · asked by rakeshscdc 1 in Astronomy & Space

Since Al Gore has been alive his home state's average temperature has cooled.. How is this global warming?

2006-06-28 18:46:25 · 6 answers · asked by Frank 1 in Earth Sciences & Geology

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

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 in Physics

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 in Physics

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 in Physics

The device can be manufactured with existing cars and laws can be set to make it compulsory in every vehicle. It can be low cost too.

2006-06-28 18:28:17 · 5 answers · asked by Mike Lu 2 in Other - Science

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 in Physics

2006-06-28 18:27:01 · 17 answers · asked by yellowtree1234 1 in Geography

2006-06-28 18:25:56 · 33 answers · asked by teameli 1 in Other - Science

if so do u think there are humans livin on them similar to us

2006-06-28 18:21:26 · 34 answers · asked by Anonymous in Astronomy & Space

2006-06-28 18:21:20 · 8 answers · asked by beibi anghell 1 in Other - Science

The pen? The pencil? The calculator? The binders?
or as a mathematician said... the stapler?
Assume that we exclude the computer.

2006-06-28 18:20:21 · 28 answers · asked by Theta40 7 in Mathematics

How high would you have to count before you would use the letter A in the English language spelling of a whole number.

2006-06-28 18:20:02 · 11 answers · asked by joegossum 4 in Mathematics

Isn't it 453? Hey I need this clarified.....

2006-06-28 18:19:20 · 4 answers · asked by Anonymous in Other - Science

If a furnace had previously been melting AISI304, then switched over to AISI316 and there were large deposits of 304 slag in the furnace; in what way would this affect the 316 about to be charged and if at all, why?

2006-06-28 18:16:57 · 4 answers · asked by scottgoring 1 in Other - Science

2006-06-28 18:11:09 · 9 answers · asked by jronezero 2 in Other - Science

2006-06-28 18:10:36 · 17 answers · asked by Anonymous in Engineering

2006-06-28 18:08:54 · 25 answers · asked by marcella i 1 in Mathematics

2006-06-28 18:03:46 · 13 answers · asked by crazyrickwcb 1 in Weather

from Einstien Albert to 10 great scientists of the maths- their contributions and theories- birth place-countries etc.

2006-06-28 18:00:47 · 5 answers · asked by abdul r 1 in Mathematics