Physics - December 2007

TABLE A g/cm^3
LIQUID:
A
B
C
D
E
DENSITY, 9m/ml
1.30
0.79
1.60
1.40
8.88

1.) where will a body sink more in fresh water or in a sea water? why?
2.) refer to table A, a solid sinks in all the liquids. which liquid exerst the greatest buoyant force on solid? why?
3.) refer to table A, a stone of density 3g/cm^3 is dropped in each liquid; in which liquid will the stone float?why?
4.)refer to table A,a solid is placed in each liquid and sank in all of them. the volume of liquid displaced is
a.) the samefor the liquids
b.) greatest in liquid E
c.) gratest in liquid B
d.) least in liquid E
e.) leastin liquid A
PROBLEM:
1.) about two third of your body mass consist of water. calculate the volume of water on a 70kg person.
2.) an object weighs 145g in air,135g in water,136.6gin gasoline and132.4g in glycerine.determine the specific gravity of a.) the object b.) gasoline c.) glycerine

-ANALYSIS OF DATA
-CONCLUSION

2007-12-15 23:09:20 · 2 answers · asked by hazz r. 1

This is a project I have in school, frankly the key leads I have are chemistry and mathematics, on where I should research on first. Can anybody expand it? What are the relation of physics with other sciences? (you could at least give me the name of the science, and I'll probe it for its relation to physics. If your feeling generous however, don't hesitate to anwer this question completely.)

2007-12-15 22:03:30 · 5 answers · asked by kaylo_otee 2

2007-12-15 21:29:04 · 13 answers · asked by mozes 2

nano tech

2007-12-15 20:40:12 · 2 answers · asked by X B 1

A wire of length 1 m. has a resistance of 0.30 ohm. It is uniformly stretched to a length of 2 m. What is its new resistance.

Answers with explanations pls, thank you, i don't know how to relate the old resistance to the new one...

2007-12-15 19:31:51 · 3 answers · asked by Sammy Baby 1

2007-12-15 18:47:13 · 1 answers · asked by kkader k 2

A sphere of radius 3 cm has an unknown amount of charge uniformly distributed over its volume. If the electric field at a distance 10 cm from the center of the sphere is 3 x10-3 N/C and points radially inward, what is the total charge on the sphere?

i'm trying to treat the sphere as a point charge, but i'm not getting a reasonable answer.

2007-12-15 18:40:25 · 4 answers · asked by Anonymous

How could it be used indirectly to power automobiles?

2007-12-15 18:34:49 · 13 answers · asked by Anonymous

If a ball is thrown up with velocity v at an angle thata,
WHY is the smallest kinetic energy .5m(vcosthata)^2 (kinetic energy at the top of trajectory) isnt it .5m(vx)? because the only v would be in the x direction ...... and vx is not vcosthata

also how do you get max height? the answer is (vsinthata^2)/2g

2007-12-15 18:34:13 · 4 answers · asked by swtgirl988 2

a 15kg ball of radius 4cm is suspended from a point 2.94m above the floor by an iron wire of unstretched length 2.85m. the diameter of a wire is 0.090cm and it's young's modulus is 1.8*10to the 11 power N/msquared. if the ball is set swinging so that its center passes through the lowest point at 5m/s by how much does the bottom of the ball clear the floor?

2007-12-15 18:22:30 · 2 answers · asked by globie 1

EXPLAIN IN TERMS OF ARCHIMEDES PRINCIPLE

2007-12-15 17:10:22 · 7 answers · asked by Handiman 3

When you roll (or slide) something through a loop-de-loop, why do you have to start the track higher than the top of the loop?

I'm not talking about something that propels itself, like a toy race car with a motor.

Imagine a track with zero friction. You have a track that leads down into a loop-de-loop. The loop reaches a height of 1 meter. The part of the track that leads down has to start HIGHER than 1 meter, even considering zero friction. I remember this fact from physics, but I don't understand why.

Can anybody explain this to me? It doesn't matter whether the object slides (like a small block) or rolls, as long as you assume zero friction.

2007-12-15 17:06:52 · 10 answers · asked by Nicholas Barry 2

At a specific engine rpm, an automobile engine provides a constant force that is applied to the automobile. If the car is traveling on a horizontal surface, does the car accelerate when this force is applied? Explain.

My answer: F = ma. Since F is constant and m is constant, then a is also constant. So, I guess the car DOES NOT accelerate? Is this right? Is the explanation right? I'm not sure... =|

Thanks!

2007-12-15 16:28:03 · 8 answers · asked by Anonymous

object 1, mass 5.0 g, moves at a speed of 20 cm/s. It collides with object 2, with mass 10.0 g, moving at 12 cm/s in the same direction. After the collision, object 1 continues with a speed of 8.0 cm/s in the same direction.

How do you find the momentum and velocity of object 2 after the collision???

thanks. :]

2007-12-15 15:58:34 · 2 answers · asked by Anonymous

2007-12-15 15:45:05 · 9 answers · asked by suhairumar 1

2007-12-15 15:20:52 · 6 answers · asked by Chad H 1

How does one determine the amount of energy is a rubber band that has been twisted numerous times. As in a rubber band propeller engine

2007-12-15 15:15:54 · 3 answers · asked by Iravan 1

2007-12-15 15:10:10 · 1 answers · asked by carlo.luna 2

2007-12-15 15:02:26 · 1 answers · asked by humble.earthling 2

I don't understand this. Anyone know?

2007-12-15 14:10:10 · 4 answers · asked by Anonymous

An airplane travels east for 1200 km in 3.25 hours. The velocity is 369.What are the units?

2007-12-15 13:36:06 · 3 answers · asked by amy 2

Scientifically speaking pls?...

2007-12-15 13:18:09 · 10 answers · asked by Jani 1

2007-12-15 12:53:33 · 3 answers · asked by mpuller44 1

A charged particle is accelerated from rest through a potential difference of 950 V and it attains a final speed of 1.80x10^7 m/s. What is particle's charge to mass ratio?

2007-12-15 12:17:44 · 1 answers · asked by kAMI kHAN 1

Does anyone know where on the net there is a stress-strain graph for some kind of plastic?

2007-12-15 11:14:40 · 3 answers · asked by Nightwing 2

without looking too deeply into it i thought i would ask this on yahoo answers.
my boss at work said that the reason we are not floating away into space is because a magnet in the middle of the earth is pulling us all towards it. I did not agree. What is the answer?

2007-12-15 10:19:40 · 7 answers · asked by Anonymous

Does that mean..that if I put water in Rocket A, and milk in Rocket B, Rocket A will go higher because water has a lower density than milk...

does that make sense^^?

2007-12-15 09:24:29 · 8 answers · asked by Anonymous

29.1 degrees above the horizontal. The block is displaced 96.5m, and the coefficient of kinetic friction is 0.169. The acceleration of gravity is 9.8m/s^2. Work= 13406.7241J.
Find the magnitude of the work done by the force of friction. Answer is Joules.

2007-12-15 08:39:59 · 1 answers · asked by Anonymous

According to the quantum mechanical model of hydrogen atom, if the orbital quantum number = 5, how many possible states will be permitted

2007-12-15 08:08:14 · 2 answers · asked by mastersource2005 5

If I had a 2D shape like a star bent from a single length of wire, how could I 'electrify' it - i.e. pass an electric current through it? I assume that I can't just join the ends straight to the 1.5v battery.
I am trying to create a magnetic field and wonder what shape it would have. Would it matter if the wire touched itself as it kept crossing over itself?

2007-12-15 08:07:11 · 4 answers · asked by Anonymous