Physics - May 2007

What exactly does this mean? Does this mean that the velocity of an object falling to the earth increases exponentially, or is the second "per second" just an obnoxiously correct way of saying that an object falls to the earth at 9.8 meters a second, EVERY second--like me saying "The car is averaging 50 miles per hour, per hour."

Another way of asking this is, would it be just as accurate to say that an object falls towards the earth at 9.8 meters per second per hour? per month? per year?

(yeah honaye I know, nothing is going to fall for a year without meeting some resistance first.)

2007-05-06 07:18:15 · 13 answers · asked by Jared C 2

A ball was thrown up into the air. The ball traveled a total distance of 125m. The time taken was 11s. What is the average speed of the ball? What is the actual speed of the ball, assuming that g (accelaration due to gravity is present)? What is the value of this acceleration?

2007-05-06 04:37:19 · 9 answers · asked by netwiyan 1

I'm having a brain fart today, so please don't criticize my stupid question:

A person hears the sound of a distant firing cannon 6 seconds after he sees the flash. How far is he from the cannon?

Thanks!

2007-05-06 04:30:15 · 4 answers · asked by millie 3

Like if you are watching a video and you submerge your limb in ice water, would you be able to recall the video better?

2007-05-06 04:23:56 · 7 answers · asked by ME!!! 1

2007-05-06 04:13:20 · 2 answers · asked by Anonymous

2007-05-06 04:09:07 · 3 answers · asked by Happy 3

moving charges/current creates a magnetic field around the conductor. so why doesn’t an electron? if it does why aren’t all objects magnetic?

2007-05-06 04:02:25 · 7 answers · asked by Max 1

2007-05-06 03:57:34 · 11 answers · asked by Piyaaa 1

2007-05-06 03:38:19 · 1 answers · asked by AlexTan 3

I couldn't find the formula for this. THe only thing i could find (both in the book and from the internet) is their ranges.

So for Alpha, its range is approximately 5.6 * 10^(-3) (m) in air

Beta's range is briefly 1 - 2 m in air

How to calculate the velocities? Isn't it equal distance/ time traveled?

I am not given the time, but given the energy. How to find out the time from the energy?

E= hc/ lambda [h and c are constants, thus lambda can be worked out, in this case lambda is wavelength]

But i'm stuck here. Please help!

2007-05-06 02:15:55 · 5 answers · asked by sunny 4

1.it absorbs only black colors and reflects other colours
2. It appears only black color
3. It reflects only black color and absorbs all other colors
4. It absorbs all the colors

2007-05-06 00:41:03 · 5 answers · asked by Anonymous

I understand energy conservation/transfer etc but I'm not sure I understand the concept of Entropy.. Can someone explain in laymens terms?

2007-05-05 23:10:33 · 10 answers · asked by Anonymous

Suppose the temperature of the atmosphere decreased from a surface virtual temperature of 15.8°C with a lapse rate of 7.4 K/km. Find the average virtual temperature of a layer extending from the surface to 7250 m.
ii. Find the scale height of an atmosphere with an average virtual temperature of −11°C.
iii. Using your result from (ii), find the pressure at a height of 7250 m above MSL in air with the above mean virtual temperature and a MSL pressure of 1025 hPa.

I don't expect you to solve them for me. If you could just show me the process for working them out then I would be very grateful. Particularly where I use the (1+0.6078) for the virtual temp and where I convert to kelvin.

2007-05-05 22:46:26 · 3 answers · asked by Anonymous

2007-05-05 22:14:52 · 6 answers · asked by batman 2

The bad effects on people, animals, the earth and anything else?

2007-05-05 22:10:40 · 5 answers · asked by blah,blah,blah 3

I was asked to describe the detrimental effects of excessive exposure of certain components of the electromagnetic spectrum.

How do I do this?Are there any good websites for this?Do you know the answer...

2007-05-05 21:13:54 · 7 answers · asked by blah,blah,blah 3

What is the formula for tensile strength?

How do u calculate tensile strength from a Stress vs Strain graph?

Thanks heaps for your help.

2007-05-05 21:13:45 · 1 answers · asked by !!!!!! 1

I worked out the density of dry air by using the pressure of 994 hectapascals and the temperature of 30 degrees celcius to get the following
Rho=994×100 / (287.0×303.13) = 1.1426 kg/cubic metre.

Now I need to work out the mass of a pocket of air with the above conditions using the volume of 90×106 m3. You don't have to calculate it, just show me the equation I would use. Please, you're my only hope.

2007-05-05 21:10:25 · 3 answers · asked by Anonymous

I worked out the density of dry air by using the pressure of 994 hectapascals and the temperature of 30 degrees celcius to get the following
Rho=994×100/(287.0×303.13)=1.1426 kg/cubic metre.

Now I need to work out the mass of a pocket of air with the above conditions using the volume of 90×106 m3. You don't have to calculate it, just show me the equation I would use. Please, you're my only hope.

2007-05-05 21:08:40 · 1 answers · asked by Anonymous

2007-05-05 20:29:08 · 1 answers · asked by amir 1

2007-05-05 17:22:17 · 9 answers · asked by cora1 1

I know it is used to create electricity but with what and how?
please don't use complex words

2007-05-05 17:14:27 · 5 answers · asked by Anonymous

Need to know for science test tomorrow....
I would appreciate it if no extremely complex words are used.

2007-05-05 17:11:56 · 3 answers · asked by Anonymous

by measuring out to be 3v i mean the potential differences between the terminals is 3v. this is a question for a test. does internal resistance. the voltmeter factor in here?

2007-05-05 16:47:31 · 4 answers · asked by Dante 2

Air is made up of about 80% nitrogen and 20% oxygen by volume. The densities of air and oxygen are 1.29 kg/m^3 and 1.43 kg/m^3 respectively. What is the density of nitrogen?

Workings appreciated

2007-05-05 16:06:33 · 1 answers · asked by Stormy Knight 1

Explan why a piece of expanded polystyrene feels much lighter than an equal volume of lead.
(should be related to density)
HELP NEEDED ASAP

2007-05-05 16:05:50 · 3 answers · asked by Stormy Knight 1

2007-05-05 15:57:11 · 4 answers · asked by sasalover_1112 2

Steam at 1 atm and 100°C enters a radiator and leaves as water (at 1 atm and 80°C). Take the heat of vaporization to be 2260 J/g. Of the total energy given off as heat, what percent arises from the cooling of the water?

a) 100
b) 54
c) 26
d) 14
e) 3.6

2007-05-05 15:40:38 · 1 answers · asked by evie2274 1

2007-05-05 14:33:32 · 4 answers · asked by James 1

2007-05-05 13:46:08 · 3 answers · asked by Anonymous