Physics - April 2007

2007-04-29 11:20:49 · 8 answers · asked by Anonymous

Mars is a strange little planet. Its gravitational acceleration at its surface is exactly 10.0 metres per second per second, and its diameter is exactly 2100 kilometres.

Also, a completely unrelated fact, dragons are able to consume about 0.4 kg of pretty much anything they want to eat, every minute, nonstop.

Assuming that the density of the planet is uniform, and that orbiting bodies don't significantly affect the planet's gravity, how many years will it take one million dragons to consume one cubic kilometre of Mars? Please round up to the nearest year.

2007-04-29 08:56:13 · 4 answers · asked by culture_killer 3

a. if the gas is heated at constant volume until the pressure triples, what is the final temp.

b. if the gas is heated so that both the pressure and volume are doubled, what is the final temp

2007-04-29 08:24:41 · 3 answers · asked by lifeisgood20 2

This has been bothering me for some time.

2007-04-29 07:46:26 · 3 answers · asked by Anonymous

2007-04-29 07:04:49 · 2 answers · asked by bigjoe711 1

2007-04-29 06:58:09 · 4 answers · asked by 007dragoon 1

Exercise about pressure with the Eiffel tower.?
I have to do an exercise about pression with the Eiffel tower.
The information they give:

Weight: 73000 Tonnes
Height: 324 metres
Pressure at the ground: 4500 000 Pa

The question: What is the contact at the surface of the ground?

Please help me.
It would be so helpful!

2007-04-29 06:41:19 · 2 answers · asked by soccerkid89 2

2007-04-29 06:36:24 · 3 answers · asked by Braniac 1

2007-04-29 06:15:11 · 2 answers · asked by K_K 1

If they are both electormagnetic waves whats the apparent difference ?

2007-04-29 05:28:11 · 7 answers · asked by K_K 1

2007-04-29 05:26:17 · 4 answers · asked by Anonymous

light illuminates two closely spaced thin slits and produces an interference pattern on a screen behind. how will the distance between fringes of the pattern differ for red light and blue light?

2007-04-29 05:02:29 · 4 answers · asked by Vienna 3

2007-04-29 04:57:40 · 29 answers · asked by purva m 1

an 80kg man jumps from a height of 2.50meters onto a platform down a mounted on springs. As the springs compress,. he pushes the platform down a maximum distance of .240m below its initial position, and then it rebounds. the platform and springs have neglible mass.
a) what is the man's speed at the instant he depresses the platform .120m?
b) if the man steps gently onto the platform, what maximum distance would he push it down?

2007-04-29 04:47:14 · 2 answers · asked by smiley25 2

2007-04-29 04:46:41 · 3 answers · asked by Anonymous

What is the formula for calculating the instantaneous speed and velocity of an object? Preferably an example with an explanation that even a precalculus student would understand?

2007-04-29 04:16:47 · 5 answers · asked by Harry K 1

in my physics book and according to my teacher the answer is that the weight of both types of water displaced will be the same but can anybody explain to me why is it so.

2007-04-29 01:02:34 · 8 answers · asked by rohit_gupta322 2

A Earth-like planet is 20 light yrs away. People in the news media say it would take 800,000 years to get there, but I took Physics in High school, and learned about special relativity (relativity in inertial reference frames). If a spaceship could accelerate at the rate of 1g (9.8 m/s2) it could reach near light speed in one year. (2.998 x 10^8 m/s / 9.8 m/s2) = 354 days, plus give "artificial gravity" for growing plants. If it increased speed half the trip, and decreased speed 2nd half. (1g for both incr and decr) how much would the time dilation be for passengers? I know how to calculate time dilation for constant speed, but not constant acceleration. Another issue is the max speed. More force is needed to accelerate a mass at greater speeds due to mass increase F=m*a. However, "work" is W=f*d (and distance decreases with increased speed), so shouldn't the increase in mass be offset with the decrease in distance? Hence the same "work/energy". More "Power" if faster.

2007-04-28 22:46:09 · 2 answers · asked by Anonymous

quantum entanglement and what it means in reality

actualy if you can say one partical is spining in synce with another by touching it ...

all the particals even the light in the universe was in contact with all other points in the big bang so quantum effects are trans dimentional not just a single atom

and every day particals with spin from the sun come into contact with spin from the earth

this means even as we speek the sun can and does know all we know.
infact this quantum link means that for all entents and perposes the entire cosmose is one unity

2007-04-28 20:16:39 · 6 answers · asked by Anonymous

s=average velocity *time
average velocity =x2-x1/t2-t1
but to derive the above formula why do we use average velocity as u+v/2 and not delta x/delta t?

2007-04-28 20:07:19 · 2 answers · asked by sneha r 2

2007-04-28 18:42:11 · 1 answers · asked by bluedynasty82000 1

what happens to the friction as 'a box on 4 wheels' gradually slows down and comes to a stop? does the friction increase/decrease or remain the same? why? what about the net force?

2007-04-28 18:21:06 · 4 answers · asked by sensitivelyambiguous 1

electrons move at certain rate produces circular magnetic field. where wire conducting current. produces magnetic field. How about a spinning charge? Does a spinning charge produces magnetic field? If it does, what would be the pattern of the magnetic field? Can we relate this phenomenon to a wire loop conducting current? where the magnetic field produced by a current loop is an inner merged toriod shape.

2007-04-28 18:20:18 · 7 answers · asked by kongkokhaw 1

2007-04-28 16:37:22 · 1 answers · asked by Danielle 2

The force on a particle is described by 9x^3 +5 at a point x along the -axis. Find the work done in moving the particle from the origin to x=5?

2007-04-28 16:28:37 · 2 answers · asked by toye7690 1

2007-04-28 15:44:00 · 10 answers · asked by Bhrigu S 2

4) A cylindrical steel rod 0.50 m long and 1.0 cm in radius
is subjected to a tensile force of 1.0 × 104 N.
a What is the tensile stress?
b What is the tensile strain?
c By what amount does the rod stretch?

5) A cylindrical rod of cast iron has a diameter of 8.0 cm.
What weight can it support if it is not to exceed 40% of
the compressive strength?

6) A uniform concrete beam has a mass of 1.0 × 104 kg
and a length of 24 m. It is supported at the ends by two
vertical steel cables each of 3.0 cm in radius, as shown
in Figure 7.54. An additional load of 1.2 × 104 kg is
placed 2.5 m from one of the cables. What is the strain
in each cable?

2007-04-28 15:32:57 · 1 answers · asked by NFLS121a 1

prove that a gun will shoot three times as high when its angle of elevation is 60 degrees as when it is 30 degrees, but will carry the same horizontal distance in each case.

2007-04-28 15:23:27 · 5 answers · asked by rohandon c 1

a daring ski jumper landed with a velocity of 100m/s, 60 degrees below horizontal to the west. when she landed , she was 550 m horizontally west of the end of the ramp.the horizontal deceleration due to air friction was 1 m/s^2.what is the height of the ramp above the ground? with what speed and at what angle did she leave the ramp?

2007-04-28 15:21:38 · 1 answers · asked by rohandon c 1

i think we can see the effects taking shape as we speak but is it real or fiction?

2007-04-28 14:35:29 · 7 answers · asked by Anonymous