Physics - March 2007

I mean since air is a gas and dust is a solid, albeit it a low-mass solid, it's got to be denser than the comparable volume it displaces in the surrounding air.

2007-03-18 05:52:37 · 4 answers · asked by Anonymous

2007-03-18 05:51:00 · 2 answers · asked by Anonymous

2007-03-18 05:49:50 · 1 answers · asked by Anonymous

A tennis ball of mass 0.0614 kg is served. It strikes the ground with a velocity of 52.3 m/s (117 mi/h) at an angle of 23.5° below the horizontal. Just after the bounce it is moving at 48.3 m/s at an angle of 17.6° above the horizontal. If the interaction with the ground lasts 0.0731 s, what average force did the ground exert on the ball?

2007-03-18 05:23:31 · 2 answers · asked by bud 1

A student wants to compare the luminous flux of a lightbulb with that of a 1750 lumen lamp. The lightbulb and the lamp illuminate a sheet of paper equally. The 1750 lumen lamp is 1.25 meters away from the sheet of paper; the lightbulb is 1.08 meters away. What is the lightbulb's luminous flux?

Please help me with this problem.
I don't understand it.

2007-03-18 05:00:19 · 1 answers · asked by swimmertommy 1

2007-03-18 04:51:25 · 7 answers · asked by driver25538 2

I need to know this since I have to answer the question "Should tailgating be considered as dangerous driving?" I am aware that these numbers are dependent on other factors so I only ask if someone is able to retrieve an average force or acceleration.

2007-03-18 04:44:27 · 2 answers · asked by DAVID P 1

2007-03-18 04:34:39 · 7 answers · asked by STORMY K 3

2007-03-18 04:06:09 · 9 answers · asked by John M 1

if by chance (1 in a billion), 2 people were to fire a bullet each from the same gun and same type bullet, at the same exact time, each 100 feet away facing eachother, what would happen if the bullets were to collide point on point?

2007-03-18 03:48:32 · 10 answers · asked by cbr600rr 3

A pole-vaulter of mass 63.7 kg vaults to a height of 6.01 m before dropping to thick padding placed below to cushion her fall. Find the speed with which she lands.

If the padding brings her to a stop in a time of 0.480 s, what is the average force on her body due to the padding during that time interval?

2007-03-18 03:44:31 · 3 answers · asked by Anonymous

We are doing a physics project on the ferris wheel. We have all of the needed calculations, but we need some kind of a visual for our presentation tomorrow. We were hoping for something that could be made out of household items and is very simple to make and understand.

2007-03-18 03:28:16 · 2 answers · asked by irishswthrt24 1

Find the angular acceleration ε of the wheel, if 2 seconds after the start of the move, the vector of the acceleration of the particle, creates the angle α =60^o with the vector of the linear speed. (Instruction: We know that the centripetal acceleration is v^2/R and the tangential acceleration is εR.)

2007-03-18 03:28:01 · 2 answers · asked by Crystal 3

I don't understand. No homework.

2007-03-18 03:25:42 · 7 answers · asked by Dovey 7

a boy is oscillating in a swing in sitting position.
what happens to his frequency if he stands (and still oscillates) ?

2007-03-18 03:24:43 · 5 answers · asked by Anonymous

(This is related to Quantum Theory. Please, only informed answers?)

Thanks!

2007-03-18 03:19:46 · 1 answers · asked by Jean Low 2

I have a test tomorrow and I am wondering how to do a practice problem I was assigned.
Any help?

The electronic flash attachment for a camera contains a capacitor for storing the energy used to produce the flash. In one such unit, the potential difference between the plates of a 770 µF capacitor is 325 V.
(a) Determine the energy that is used to produce the flash in this unit(Joule).

(b) Assuming that the flash lasts for 5.0 10-3 s, find the effective power or "wattage" of the flash(Watt).

2007-03-18 02:21:54 · 1 answers · asked by neverconsiderlifeonascale 1

2007-03-18 01:49:30 · 1 answers · asked by Anonymous

Why/ why not?

2007-03-18 01:33:00 · 10 answers · asked by Chocolate Strawberries. 4

how to convert lux unit to other currently used unit?

2007-03-18 00:47:52 · 3 answers · asked by nico robin 1

2007-03-18 00:06:59 · 6 answers · asked by Anonymous

2007-03-18 00:02:50 · 14 answers · asked by anamika 1

I do have a passion for exotic parts in science whatever it may be and this is one of the questions that kinda bother me. I think it will take more than a few years till physicists meet with the end of the theory. Salutations :D.

2007-03-17 23:54:05 · 4 answers · asked by Mihai M 2

2007-03-17 23:37:48 · 5 answers · asked by fAtiN hAsEgAwA 1

2007-03-17 23:20:45 · 3 answers · asked by Anonymous

2007-03-17 23:19:50 · 3 answers · asked by Sinnath G 2

resulting movement of the block of ice due to impact of the bullet is negligible. If the bulllet is made up of copper initially at 25(superscript)oC and all its kinetic energy is imparted on melting parts of the block of ice initially at 0.00(superscript)oC, find the amount of water that will result due to the bullet. (specific heat capacity of copper is 390 J/kg-K, heat of fusion of water is 3.34 x 10^3 J/kg).

2007-03-17 23:19:30 · 2 answers · asked by bonjette 2

I've got 3 polystyrene circles about 20 cm in diameter a silk cushion and some aluminium foil, can anyone help me make a good spark

2007-03-17 23:15:35 · 1 answers · asked by Anonymous

2007-03-17 23:02:01 · 6 answers · asked by Sinnath G 2

2007-03-17 22:50:07 · 7 answers · asked by Malfoy vs Potter 5