Physics - November 2006

2006-11-21 15:26:24 · 7 answers · asked by praveenplp 2

A 22.5 kg block is at rest on the incline. The coefficients of static and kinetic are .6 and .4 respectively. The angle is 25 degrees. What is the frictional force acting on the 22.5 kg mass ?

2006-11-21 15:16:42 · 5 answers · asked by Maria M 1

When there is a bee in a moving car ,we find that it can move from the back to the front of the car.May be if literally seen we can say that it moves at a speed higher than the car,,,,,,,,,,,,why?

2006-11-21 14:54:15 · 6 answers · asked by erico 2

A raliroad diesel engine weighs four times as much as a greight car. If the diesel engine coasts at 5 km/h into a greight car that is at rest how fast do the two coast after they couple?


A 5kg fish swiming at 1 m/s swallows an absent minded 1-kg fish at rest. What is the speed of the large fish immediatly after lunch? what would its speed be if the small fish were swimming towart it at 4 m/s?

2006-11-21 14:40:01 · 3 answers · asked by Anonymous

Will a thick lens have a longer or shorter focal length than a thinner lens or the other way round?

2006-11-21 14:31:33 · 3 answers · asked by George O 1

2006-11-21 14:28:07 · 12 answers · asked by john w 1

Like, if the total magnification is "40x"
What does the "x" stand for?

2006-11-21 14:22:22 · 4 answers · asked by Roxy 1

If you could dig a straight shallow tunnel through the earth, say from NY to LA, and then evacuate it and put in a zero friction track, you could roll a train from one end to the other with no propulsion system other than gravity. As the train left NY it would roll very slowly, gain speed until it got half way to LA, then start to slow down, pull very gently into the LA station, then stop.

I need mainly the time it takes for the train to go from NY to LA.
I need to know the calculations needed and how to do them.
Thanx!

2006-11-21 14:06:46 · 3 answers · asked by Anonymous

2006-11-21 13:49:16 · 7 answers · asked by hhskd922 2

it has to be kind of funhouse that you usually see at the fair and i have to inckude all these mirrors if any 1 has any ideas that'd bee goodd

thx

2006-11-21 13:26:14 · 1 answers · asked by marinarafat 3

A 500 kg sack of coal is dropped vertically onto a 2000 kg railroad flatcar which was initially moving at 3 m/s toward the right. Just after the sack comes to rest on the flatcar what is the speed of the flatcar ?

2006-11-21 13:19:01 · 4 answers · asked by Maria M 1

V=600m/s
Weight of bullet=5gf
No. of bulletes per min.=250.
Find the POWER

2006-11-21 12:46:19 · 1 answers · asked by SdM 4

{a}wood
{b}copper
{c}aluminium foil
{d}iron

2006-11-21 12:05:54 · 5 answers · asked by `Avenging~ghetto~bird` 3

Isnt a mass equal to the density of an entity times its volume?

2006-11-21 11:36:28 · 5 answers · asked by goring 6

Don't know where to start on this question, thanks in advance

Contestant throwing a 7kg bowling ball straight up in the air. The force exerted in 810N on the ball, the distance of the force exerted is 2m. How high did the ball go from the point of release?

i know to use F=ma as F=(7kg)(9.8) on the ball but don't know which equation to use for the rest of the problem

2006-11-21 11:34:33 · 2 answers · asked by Kevin C 1

Arent the frames of references the real dimensions?

2006-11-21 11:31:57 · 7 answers · asked by goring 6

a free response question i don't understand

How much power is developed by a motor that moves 45kg load a distance of 200m in 1.5min?

I got stuck on how to do that question, please help me

thanks in advance

2006-11-21 11:00:42 · 5 answers · asked by Kevin C 1

It's amazing as it's cold by the time it gets to your mouth! Brilliant science experiment! Let me know if anyone else has any other fun/weird things they do such as this one!!!

2006-11-21 10:44:36 · 14 answers · asked by Anonymous

Car on road:
pairs of action reaction:
- Car on road
- Road on car

WHAT IF
We built a "rocket" : we had a string from 1 place 2 another then we put a straw in the string and attached the balloon to the straw w/ rope... and let it go
we titled the rope so it could come back, later on...


what are the acction - reaction pairs for the rocket???


HELP

2006-11-21 10:43:49 · 3 answers · asked by BeatyIsInTheEyesOfTheBeholder 1

2006-11-21 10:40:36 · 5 answers · asked by killsyche 3

can anyone help me with this,E=MC2,okay so that means energy=mass to the speed of light by the power of two (or times by itself), its the last bit that confuses me,how can you times the speed of light by itself (speed of light x speed of light),as nothing can go faster than the speed of light then surly the last part of the equasion would work out faster than the speed of light, do you understand what I mean,also one last thought WHY cant anything go faster than the speed of light anyway, please try to answer this in plain english as I won't understand you if you start getting deep,see ya !

2006-11-21 10:35:59 · 9 answers · asked by Anonymous

We have just had a loft conversion and the building inspector now needs to know if the steel beam put in our through lounge some 15 years ago is the measurement as given above, but I can't understand what this is. Can it be converted to feet and inches or not

2006-11-21 10:12:12 · 5 answers · asked by Anonymous

We're talking about the 11th dimension's unit self.

2006-11-21 09:54:54 · 1 answers · asked by merviedz trespassers 3

2006-11-21 09:30:51 · 5 answers · asked by azera221 4

i'm a high school student in the Phils. we have this investigatory project due in three weeks and unfortunately, our first topic which we have been studying for 5 months now cannot be tested because the equipment is not available here in our country. so our group thought of a new topic and that is to find out a coating which can be applied to cellphones which can lessen the persons exposure to UV coming from cellphones.can anyone suggest and give me background on this matter. i was thinking if it would be possible if you guys give a possible liquid UV curable substance for our study( maybe a substance which is not used for this purpose but has potential to be used as such. or any other liquid substance which has potential. the substance must by the way be UV curable in the first place)

2006-11-21 09:08:45 · 3 answers · asked by three_sixty 2

2006-11-21 08:50:30 · 3 answers · asked by leeanne 1

A bubble of gas (0.115 cm^3) formed at the bottom of a 12.7 cm deep container of mercury. The temperature is 33 degrees C at the bottom and 33.6 degrees C at the surface, so what is the volume of the bubble just beneath the surface of the mercury in units of cm^3?.

Acceleration of gravity is 9.8 m/s^2. Assume that the surface is at atmospheric pressure 101300 Pa. Use 13600 kg/m^3 as the density of the mercury.

2006-11-21 08:46:51 · 2 answers · asked by Anonymous

That is, could it answer a question before it has been asked? I know that quantum physics includes "negative energy"....

2006-11-21 08:28:54 · 10 answers · asked by Aaron W 3

A one-liter container completely filled with mercury has a mass of 13.6 kg and weighs 133.3 N. What is the buoyant force on the container if the container is placed in water?

Thank You

2006-11-21 08:20:24 · 1 answers · asked by rippa q. 1

2006-11-21 08:15:10 · 3 answers · asked by brianhaisch 1