Physics - May 2007

A 110 g ball is thrown horizontally at a 1011g box with a hole in it. The coefficient of friction between the box and the surface it is on is 0.24. When the ball enters the box, it does not bounce out and the whole unit moves 17cm. When was the initial velocity that the ball was thrown at?

2007-05-07 14:37:23 · 1 answers · asked by Anonymous

Son's science question--we have covered the entire chapter and did not find the answer to this question

2007-05-07 14:20:34 · 9 answers · asked by chan m 1

2007-05-07 13:54:45 · 1 answers · asked by BuRrito 1

2007-05-07 13:42:47 · 6 answers · asked by erc 1

In order for the Earth to maintain something resembling a stable temperature over time, a certain amount of heat must escape the planet every day. Where does it go? How can heat travel through outer space, when space is very nearly a perfect vacuum and therefore has almost no matter for heat to travel through? It seems to me that even if heat can travel through outer space, it must be very very inefficient at pulling the heat out of the atmosphere, since it is so low in density.

2007-05-07 13:20:30 · 1 answers · asked by Zac79 2

For science class, I need to make some sort of rig that will throw a playing card. Anyone know how a really simple way to do this would be?

2007-05-07 13:07:58 · 3 answers · asked by Anonymous

2007-05-07 13:05:55 · 3 answers · asked by allieomalliee 1

does it take to stop? Please help me!

2007-05-07 12:25:46 · 2 answers · asked by .·´¯`·-> вавіі-ѕнаz <-·´¯` 2

a small block ofmass M is realeased from rest at the top of the curved frictionless ramp. The block slides down the ramp and is moving with a speed of 3.5vnaught when it collides with a larger block of mass 1.5M at rest at the bottom of teh incline. the larger block moves to the right at a speed of 2v naught immediately after the collision express answers in terms of the given quantities and fundamental constants
(A) determine height h of the ramp from which the small block isreleased
(b) determine the speed of the small block after the collision
(C) the larger block slides a distance D before coming to rest. Determine the value of teh coefficient of kinetic friction mew between the larger block and the surface on which it slides
(d) indicate if it is a elastic or inelastic collision.

so i tried it out and here are my answers if they are right let me know if not please help me
(A)h=.5v^2/g
(b) deltap=fdeltaT
(c) mew(ma)=friction
(D) inelastic

2007-05-07 11:46:39 · 4 answers · asked by bwaystar123 2

I am doing a project for school and I need to know but I can't find the answer.

2007-05-07 10:45:27 · 8 answers · asked by sunfire1226 1

are you willing to have a prosthetic placed on or within your body that would "enhance" you.
For example:
a chip for calculations and/or exteneded memory,
or a cell phone chip in your ear,
or infared vision in your retina,
or even legs that would allow you to jump and run better than ever?

what kind of social implications could this have on us?

2007-05-07 10:32:37 · 4 answers · asked by Mercury 2010 7

2007-05-07 10:26:54 · 7 answers · asked by Anonymous

2007-05-07 09:57:51 · 5 answers · asked by Anonymous

If Resistance=VoltageXCurrent, what does Voltage equal?

2007-05-07 09:52:01 · 7 answers · asked by Anonymous

2007-05-07 09:25:18 · 10 answers · asked by Cody C 1

2007-05-07 07:22:19 · 3 answers · asked by Tyin K 2

Help I am so lost :(

2007-05-07 07:07:52 · 3 answers · asked by Eric 1

Help please
I am lost :(

2007-05-07 06:50:46 · 5 answers · asked by Anonymous

help please I am totally lost :(

2007-05-07 06:44:45 · 7 answers · asked by Anonymous

We are a trainings center and as part of a course we are working on a project. We would like to build a stone heater.
The usually offered stone heaters are coming in the shape of a panel/slab and is aprox 1.2 x 0.5 x 0.03m and equipped and heated with by 1000 - 1200 Watt. The granit/marble panel/slab weights aprox 45 kgs.
The manufacturer is saying that this size(mass) - surface relation is the most efficient. aprox 0.5M2 to 1000 Watt.
As we ve got in our workshop only 5 blocks of granit, we would like to know is we also get a good result with our blocks.
Instead a granit panel, we thought to heat our block of granit (dimensions are 0.7m x 0.65m x 0.35m )aprox weight is 80kg and is equipped with 3 heating elements of each 800Watt.

Is a corrolation between the mass/surface/watt and heating efficiency???
Can we heat our blocks and get the same or an even better result ?
Are there other shapes which would be even better for this purpose.
Does more mass means more consumption?

2007-05-07 06:36:41 · 2 answers · asked by depepe 1

Could someone please help me with this I am really lost :(


a) what is the resistance of the toaster
b) How much current will flow when the toaster is on
c) What is the power of the toaster?
d) If it takes 3 minutes to properly make toast, and the cost per kilowatt-hour is 10 cents, how much does it cost to make one slice of toast?

2007-05-07 06:08:13 · 4 answers · asked by Anonymous

A ping pong ball has a diameter of 4.78 cm and average density of .046 g/cm^2. The volume of a ball is 4/3(pie)R^3, where R is the radius of the ball. what force would be required to hold it completely submerged under water ? answer in units of N.

2007-05-07 05:50:50 · 2 answers · asked by Anonymous

Particular attention needs to be paid to:
a-the procedure to be followed
b-how the wavelength falling on the LDR is determined
c-how a measure of light intensity can be obtained from the LDR
d- the range & precision of any instruments that would be used
e- the factors that would need to be controlled to ensure a valid test
f-any safety precautions you would take when carrying out the investigation
g-particular features of the design that would ensure accuracy & reliability of results

2007-05-07 05:29:32 · 2 answers · asked by Selly 3

HI, I have a pond filter that uses UV light to kill bacteria but since UV light is invisible, I cant tell if it is on or now. Does anyone know of something that I could use to be able to see the UV light?

2007-05-07 04:22:13 · 1 answers · asked by Johnny 3

A container is filled with water to a depth of 20.0 cm. On top of the water floats a 30.0cm thick layer of oil with a density of .70 X 10^3 kb/m^3.

a. what is the pressure at the surface of the water?

b. what is the absolute pressure at the bottom of the container

If anyone could show me how to get the answers to this question i would greatly appreciate it. Thanks.

2007-05-07 03:55:46 · 3 answers · asked by strawberrylollipop12345 1

please help,8 year old sons homework,

2007-05-07 03:47:54 · 15 answers · asked by DEAN 2

go back in time,is it possible theoretically?

2007-05-07 03:02:15 · 9 answers · asked by eddy1234 1

2007-05-07 02:44:24 · 1 answers · asked by ramil e 1

which one would be the best in terms of delivering power to the ball?

I've always wondered why players who cork their bats don't just use a shorter bat in the first place, since the end of the end bat essentially becomes useless. Also, holding the bat higher up on the handle effectively is the same thing as using a shorter bat.

2007-05-07 02:28:40 · 1 answers · asked by Don't Fear the Reaper 3

2007-05-07 02:15:19 · 15 answers · asked by montpelier42 2