Physics - September 2007

2007-09-25 07:37:52 · 7 answers · asked by Anonymous

2007-09-25 07:27:20 · 6 answers · asked by Zinchik 1

A hole is drilled through the center of Earth and elevator car is installed inside?
The car departs from the surface (1km above sea level), and after quick initial acceleration continues to move towards the center of the earth at constant velocity 100 m/s.

Few seconds into constant velocity phase of the trip, when elevator just crosses sea level, a passneger drops elactic ball on the floor, which continues to bounce elastically from the floor with initial period 1s.

As the car approaches the center of the earth, period of bouncing gradually increases.

What is the period of bouncing half-way towards the center of earth?
[in assumption of uniformly dense planet, gravity at this point is g/2]

2007-09-25 06:53:04 · 4 answers · asked by Alexander 6

i saw a tv show the other day about this woman who had a robot copy of herself made, but when she finds out, she says that's impossible because it violates quantum mechanics, i thought that quantum mechanics dealt with extremely small particles! can someone explain this to me?

2007-09-25 06:51:04 · 8 answers · asked by Loki 1

Please answer as if you were talking to a layperson (which you are). I'd like your answer to be understandable by anybody with a VERY basic understanding of physics.

2007-09-25 06:50:33 · 3 answers · asked by Anonymous

http://www.usoc.org/omega-lowres.jpg

2007-09-25 06:48:36 · 4 answers · asked by Anonymous

2007-09-25 06:42:21 · 8 answers · asked by okrusoup 2

pls help.

2007-09-25 06:19:42 · 6 answers · asked by oge 4

Planet X has two times the diameter and eight times the mass of the earth.

What is the ratio gx : ge of gravitational acceleration at the surface of planet X to the gravitational acceleration at the surface of the Earth?

2007-09-25 05:45:31 · 4 answers · asked by Jaweida S 1

Find the magnitude of the gravitational force
a 62.6 kg person would experience while
standing on the surface of Earth with a
mass of 5.98 *10^24kg and a radius of
6:37 *10^6 m. The universal gravitational
constant is 6.673 * 10^ -11 N * m2/kg2. Answer
in units of N.

Find the magnitude of the gravitational force on Mars, with a a mass of 6.34x10^23 kg and a radius of 3.43x10^6m. answer in units of N.

Find the magnitude of the gravitational force on pluto with a mass of 1.32x10^22 kg and a radius of 1.15x10^6m. Answer in units of N.

2007-09-25 05:43:19 · 2 answers · asked by Jaweida S 1

Describe how careful measurments of the variation in gravity in the vicinity of an ore deposit might be used to estimate the amount of ore present?

2007-09-25 05:34:01 · 1 answers · asked by Anonymous

some spcial vehicles have spinning disks to store energy whil they roll downhill. they use that stored energy to lift themselves uphill late on. their flywheels have relatively small rotational masses but spin at enormous angular sppes. how would a flywheel's kinetic energy change if its rational mass were FIVE times larger bit its angular speed were FIVE times smaller?

2007-09-25 05:19:53 · 2 answers · asked by sippy85 1

Find its average acceleration in term of g

2007-09-25 05:19:30 · 2 answers · asked by salvatore g 1

Please answer my question! :p...thank you

2007-09-25 05:12:13 · 3 answers · asked by mathewL 3

u dont have to answer all of these, but please explain how you figured it out.

1. At what angle should a slingshot be oriented for maximum altitude? for maximum horizontal range?

2. neglecting air resistance, if u throw a ball straight up with a speed of 20m/s, how fast will it be moving wen u catch it?

3. A projectile must be moving 8km/s in order for it to match the curve of the Earth. Question: why is it important that such a satellite be above the earth's atmosphere?

2007-09-25 05:11:53 · 1 answers · asked by Anonymous

an electric saw uses a circular spinning blade to slice through wood. when you start the saw, the motor needs 2 secs of constant angular acceleration to bring the blade to its full angular velocity. of you change the blade so that the rotational mass, how long will the motor need to bring the blade to its full angular velocity?

2007-09-25 05:08:04 · 1 answers · asked by goofy 2

2007-09-25 04:45:02 · 9 answers · asked by surlygurl 6

what can you tell me about distance and displacment and do u know any websites about it?

2007-09-25 03:40:52 · 3 answers · asked by Sara *Life is so unlike theory* 5

Please and thank you (: (: xx

2007-09-25 03:25:51 · 5 answers · asked by Anonymous

2007-09-25 03:25:13 · 1 answers · asked by jjacob 1

Class XI Physics...

2007-09-25 03:14:26 · 2 answers · asked by invincible_perfectionist 1

2007-09-25 03:03:24 · 4 answers · asked by daineyjinh 1

hi guys, if a cell phone battery with 957mAh and 3.7V.

957mAh is the battery capacity, isnt it?

So, is it mean that the power require to fully charge the battery is (957 X 3.7)/1000000 = 0.0035 kWh ? (assume the battery is completely empty)

If it is true (need 0.0035kWh power to charge), is that also mean this is the power needed with regardless of the charging time? for example, 2 same capacity batteries may need different time to fully charge the battery, but the power it require is the same, is it truth? Because I am not sure the relationship between charging and the capacity.

Thank you very much!

2007-09-25 03:00:02 · 4 answers · asked by marco824xu 1

I have an extra credit problem for my physics class. The situation involves an electron sitting between two grounded infinite conducting planes. You need to find the E-field and the potential everywhere etc. It goes on to ask: "Why can't a similar construction be done for gravity? What would it mean to have a 'grounded' object in this case? What would you have to do to set the gravitational potential to zero in some region?" I am unable to make the connection. Help is appreciated.

2007-09-25 02:38:01 · 4 answers · asked by dave r 2

2 children are playing on 2 trampolines. 1st child can bounce up 1/2 times higher than 2nd child. initial speed up of 2nd child is 5.0 m/s.

2007-09-25 02:33:48 · 1 answers · asked by T W 1

A force of 17N is applied to a 6KG block which is at rest. Find:
A] Acceleration
B] Velocity
C] Distance After 9 seconds.

I solved A with the formula Force divided by Mass. [a=F/m]
17/6=2.83 m/s2

Solved B with the formula: Initial Velocity plus Acceleration times Time [Vf=Vi+a(t)]
0 + 2.83(9) = 25.47m/s

Now, for the distance (c) i have two formulas. the first one is:
Distance = Velocity * Time
and
Distance = Initial Velocity (time) + 1/2 a (time)2


Which formula is the right one to use?

2007-09-25 02:08:47 · 6 answers · asked by Ojcc 3

The 5,000 kg final stage of spaceship ejects the 10,000 kg second stage. Before ejection, the two stages together travel with a velocity of 200 m/s. If after ejection, the second stage travels 80 m/s opposite the direction of its initial motion, what is the velocity of the final stage?; please show the formula that u used. thanks

2007-09-25 01:09:45 · 1 answers · asked by JEV# 2

2007-09-24 23:52:39 · 3 answers · asked by redhunter 1

Also if you know Neutrons and protons too

2007-09-24 17:54:58 · 8 answers · asked by Anonymous

2007-09-24 17:53:51 · 2 answers · asked by Anonymous