Physics - April 2007

For the formula for mass (mass=density x volume), I need the density of the object, and yet, it seems there is no way to find it (it's not given on this homework sheet I have, and in order to find the density, I need the mass, which is what I'm looking for in the first place). ...HELP

2007-04-15 08:33:40 · 4 answers · asked by Anonymous

2007-04-15 08:16:48 · 6 answers · asked by loplinger12 1

Lincoln 250 D 7018 rods burn blue, instead of silver.
6011 & 6010 rods burn Blue and/or black

2007-04-15 07:59:27 · 1 answers · asked by Grumpy 1

Given: A circular shaped object with an inner radius of 15 cm and an outer radius of 29 cm. There are three forces (acting perpendicular to the axis of rotation) whose magnitudes are
12 N, 24 N, and 13 N acting on the object. The force of magnitude 24 N is 25degree below horizontal.

Find the magnitude of the net torque on the wheel about the axle through the center of the object. Answer in units of Nm.

2007-04-15 06:39:05 · 1 answers · asked by i.p 1

is it saying that stuff, anything from a brick to a fish, when broken down to the smallest degree made up of energy? so does everything in the universe share the same basic building blocks?

2007-04-15 06:23:52 · 6 answers · asked by Anonymous

Q.8 All bodies dropped together fall to the ground in the same amount of time. But if
two spheres roll down an inclined plane, one may take more time than the other.
Explain why.

Q.9 Ship designers want to keep the CG of their ships as low as possible. Why? Discuss
why there is a contradiction between this requirement, and other requirements.

2007-04-15 05:37:23 · 8 answers · asked by unbousom 1

Q.5 a) Would you rather land with your legs bending or stiff?
b) Why do cricket fielders move their hands backwards when catching a fast ball?
c) Why do railway carriages have dampers at the front and back?
Q.6 In the lecture demonstration you saw that there are 3 balls of equal mass placed in a straight line. The first strikes the second and comes to rest. The second moves and hits the third and comes to rest. The third one then moves off alone.
a) What would happen if the second one was twice the mass of the first or the third, and if the collision was elastic?
b) What would happen if the second was infinitely heavy, and the collision was elastic?
c) What would happen if the collision of the first and second resulted in these two getting stuck to each other? With what speed would they strike the third one?

2007-04-15 05:33:02 · 4 answers · asked by unbousom 1

2007-04-15 05:13:19 · 3 answers · asked by Vaingloriousz 1

. What was the net force acting on your balloon as it was released?
i know the mass is 65 N but dont know the acceleration and need to mind the mass
i cant use F=MA because i dont know the acceleration

2007-04-15 04:09:37 · 2 answers · asked by blackbeltcc4 2

If you can't bring Muhammad to the mountain then bring the mountain to Muhammad.

If, in a stream of flowing water there are two objects flowing in the stream, one object being ahead of the other by a distance X and the object ahead becomes lodged, being stationary relative to the flow of the stream, does not the following object moving unhindered with the flow close the distance X by the speed of the stream?

How fast does the Galaxcy Milky Way move in the stream?

If I was in a UFO seemingly in Earth's atmosphere maintaining a fixed position, hovering, and was being approached by U.S.A.F. interceptors, and to evade interception immediately negated the Earth's gravity freeing me of the rotational axial spin of the Earth how would that appear to the pilots in the interceptors, that the UFO was moving at a fantastic rate of speed because the interceptors are moving at approximately 17,000mpg?

2007-04-15 04:06:19 · 2 answers · asked by Anonymous

2007-04-15 03:52:59 · 4 answers · asked by Lorenzo de' Medici 1

Is mass a fundamental dimension? I did a dimension analysis on mass, which get the reason that Mass is a function of charge, magnetic field and time. So, is mass a fundamental dimension?

2007-04-15 03:00:55 · 8 answers · asked by kongkokhaw 1

What's the English word for the high-pitched sound and the phenomenon which leads to it? In Romanian it's called "microphony", but I don't know whether it's the same in English.

2007-04-15 00:57:31 · 8 answers · asked by dan_can_dance 2

Microwaves are pretty powerful, and it's intriguing that a plastic door and thin metal shell prevent those microwaves from escaping and cooking the cooker. Why don't they heat outside the box?

2007-04-14 22:48:43 · 11 answers · asked by Joshu@ 5

A radiation source delivers a dose of 10 Gy on a target of mass 3.0 g during a 14-minute interval. Every disintegration delivers on average 70 MeV to the target. Assume the activity of the source is constant during the time involved.
a) Determine the power output of the source
b) What is the activity of the source?

I don't just want the answer, please explain it too, thanks a lot.

2007-04-14 22:33:03 · 2 answers · asked by Anonymous

If it is physically possible to exceed the velocity in which the universe is expanding, can we move forward in time?

2007-04-14 21:55:11 · 7 answers · asked by Armchair Warrior 2

i read this novel..timeline where they have computers which work on quantum theory...is it possible??

2007-04-14 21:31:56 · 5 answers · asked by fakhru 2

I prefer a more scientific answer

2007-04-14 21:30:34 · 9 answers · asked by Abhijith p 1

when wood is burned,energy is released in the forms of heat and light. but remember to use the terms combustion, exothermic, and chemical energy

2007-04-14 21:17:21 · 2 answers · asked by jalirah g 1

2007-04-14 19:57:02 · 5 answers · asked by Frozzelaries 1

I looked it up but I don't understand it.

2007-04-14 18:40:47 · 6 answers · asked by Love Exists? 6

What wormwhole theories tell? If we go in past and kill our ancesters before our birth, then how we are here?

2007-04-14 17:50:53 · 10 answers · asked by .................rrc 1

thanks

2007-04-14 16:50:47 · 7 answers · asked by Anonymous

2007-04-14 16:01:46 · 15 answers · asked by Anonymous

a billion (1.0*10^9) electrons are removed from a neutral sphere and placed on a second neutral sphere 5cm away. What is the magnitude of the force the first exerts on the second? what is the magnitude of the force of the second sphere exerts on the first?

thanks!

2007-04-14 15:49:17 · 2 answers · asked by tmacfan1121 2

ambidextrious = Someone who is good with both of their hands

(just in case)

2007-04-14 15:33:32 · 2 answers · asked by Ian W 2

For example, a 160 lb. driver of a 3,000 pound car, using a 200 horsepower 4 litre engine wants to carry a 100 pound bag of cement for 1 mile. The car gets 25 mpg with only the driver. How much more gas (or fewer mpgs) will the car use to carry to additional 100 pounds for 1 mile?

2007-04-14 15:14:21 · 3 answers · asked by generousT 5

when calculating Tensile Strain or Compressive Strain, we use this equation: Strain=dL/L, where dL is the change in length, and L is the original Length, or by the the young's Modulus and the Tensile/Compressive Stress, how can I calculate the shear strain? It won't be dL/L, because the force here is applied to a tangential Area, and a deformation occurs. Please help

2007-04-14 15:05:57 · 6 answers · asked by Ahmad L 1

I thought helium is lighter than air. But helium baloon at room temperature of 30 deg.C drops to the ground 24 hours later. What has changed its density?

2007-04-14 14:42:58 · 3 answers · asked by Gomezz 2

2007-04-14 14:17:37 · 7 answers · asked by Lost. at. Sea. 7