Physics - March 2007

A 3.9 resistor, 7.7 resistor, and a 10.5 resistor are connected in parallel to a 24 V battery.

(a) Determine the equivalent resistance for the circuit.

(b) Determine the current delivered by the battery.
A

2007-03-22 12:46:12 · 1 answers · asked by Anonymous

2007-03-22 12:45:47 · 5 answers · asked by kmm4864990 1

) What is the change in its mechanical energy?

What is the magnitude of the average force from the wall stopping it?

2007-03-22 12:35:33 · 2 answers · asked by Anonymous

Why cant scintests get 2 absolute 0????

2007-03-22 12:32:22 · 2 answers · asked by Alien Demo 2

For a very inquisitive six-year-old.

2007-03-22 12:24:06 · 12 answers · asked by Voight-Kampff 3

In a demonstration of electromagnetic induction, a square coil of 150 turns and dimensions 0.02 m by 0.02 m, is placed in a horizontal plane through a uniform vertical magnetic field of strength 20 mT.

What is the MAXIMUM flux through the coil?

2007-03-22 12:22:44 · 2 answers · asked by Anonymous

directed 60ø above the horizontal. The coefficient of kinetic friction between the box and the ceiling is 0.3. The acceleration of the block is

2007-03-22 12:22:18 · 2 answers · asked by l_walker2005 1

In the above problem the speed of the block after it has traveled 1 m is

2007-03-22 12:21:23 · 2 answers · asked by l_walker2005 1

vertical. If the motorcyclist negotiates the curve without sliding, her speed is

2007-03-22 12:20:36 · 2 answers · asked by l_walker2005 1

height of 15 m and the block has mass 2 kg. How long will it take the block to reach the bottom of the incline?

2007-03-22 12:19:08 · 2 answers · asked by l_walker2005 1

2007-03-22 12:01:04 · 5 answers · asked by demonicharmany 1

I'm having trouble with the difference between the effect of weight and volume on flotation..

1. Compared with an empty ship, would a ship loaded with a cargo of Stryrofoam sink deeper into the water or rise in the water? Defend your answer.

2. A barge filled with scrap iron is in a canal lock. If the iron i thrown overboard, does the water level at the side of the lock rise, fall, or remain unchanged? Explain

3. Suppose that you are given the choice between two life preservers that are identical in size, the first a light one filled with Styrofoam and the second a very heavy one filled with gravel. If you submerge thse life preservers in the water, upon which will the buoyant force be greater? (the one filled with gravel right?) Upon which will the buoyant force be ineffective (Styrofoam?) Why are your answers different?

2007-03-22 12:00:23 · 1 answers · asked by Anonymous

Yesterday at Disneyland my friends and i got stuck on the Roger Rabbit, ride, and I expressed that I was just glad that at wasn't at the top of the loop on the roller coaster. My friend said that that could never happen because of the reason stated above. Is that true?

2007-03-22 11:35:17 · 3 answers · asked by Sugarbaby 2

2007-03-22 11:06:55 · 2 answers · asked by Abnerbabii 1

I'm looking into building a trebuchet of my own; I'm not sure about the size or anything, so I'd like to be able to toy with equations that would show me how much stress certain parts of it could handle, best arm length, etc.

Or, failing that, does anyone know of some good sites that might help me? I could do without the equations if I could find a good explanation of how to build it. Most sites I've come across are pretty vague and not much help. Thanks in advance!

2007-03-22 10:51:15 · 1 answers · asked by Frogger 1

An expert on a talk show said there could be millions of possibilities of the laws of physics. Could somebody elaborate on what it would be like in a few other forms?

2007-03-22 10:44:09 · 2 answers · asked by Jim T 1

with F=Ma and analyzing motion according to vectors. Who came up with E=(1/2)m (v^2) and the energy idea of motion and when did he do this?

2007-03-22 10:41:47 · 1 answers · asked by kmm4864990 1

What is the orbital angular momentum of the earth? That is the angular momentum due to the earth revolving around the sun?

2007-03-22 10:31:09 · 1 answers · asked by Kimmy D 1

what torque would superman need to exert on the Earth to stop it from spinning in 1 hour?

2007-03-22 10:29:21 · 1 answers · asked by Kimmy D 1

Two men are standing on a merry-go-round which is turning at a constant angular speed. One man is standing very near the center of the merry-go-round, the oher is standing very near the edge. the man at the center is trying to throw a baseball directly to his friend at the edge but the ball always winds up far away from target. The angular speed of merry-go-round is .1 radians/second and it is 12 meters in diameter. The baseball is thrown with a velocity of 13m/s exactly horizontally...how far from the catcher does the ball wiind up.


Also-- the catcher perceives that a force is acting on the ball to skew its path. This is a "fictitious force." What size force would be needed to cause the motion observed by the catcher if it were real?

Homework problem that I have benn givent the answer but I do not understand how it is done....if anyone can explain it to me step by step...thanks

2007-03-22 10:26:42 · 4 answers · asked by Kimmy D 1

In science, we did an experiment. The set a slop of the car at 10 degrees. We rolled down the car. then we set the slope angle at 20 degrees and this time the car accelerated faster. then we further increased the slope of the car and it accelerated faster. So why does the acceleration of the car increase as the slope is increased?

2007-03-22 10:22:19 · 4 answers · asked by tondris 2

2nd question: A question about impulse. Can it be said that the more elastic two projectiles are, the longer they will remain in contact with one another when they collide?

2007-03-22 10:20:44 · 2 answers · asked by kmm4864990 1

A skater is initially spinning at a rate of 14.7 rad/s with a rotational inertia of 2.72 kg·m2 when her arms are extended. What is her angular velocity after she pulls her arms in and reduces her rotational inertia to 1.58 kg·m2?

2007-03-22 10:09:26 · 2 answers · asked by Anonymous

If it has, how can it be calculated and/or determined?

2007-03-22 09:43:43 · 2 answers · asked by mc2_is_e 2

Being given the electric field of 2.4 x 10^4 N/C, how would you determine the magnitude and direction of the electric force on a proton and an electron. Would the magnitudes be the same because they have the same charge?

2007-03-22 09:35:17 · 3 answers · asked by Question-er 2

it has been said that if the core was to go into full melt dowm it would pass clean through the planet and pass out the other side. my question is, as the core reaches the centre of the planet would gravity not slow if down and hold the molten core in the centre of the planet as the force of gravity would be equal?

2007-03-22 09:31:39 · 6 answers · asked by Anonymous

2007-03-22 09:30:54 · 4 answers · asked by ryan_lx 2

2007-03-22 09:28:32 · 5 answers · asked by rathesungod88 2

i know this is wrong since i am suppose to be figureing this out myself. but i really cant get this one.


A 1300-kg rocket has a net propulsion force of 50 kN (kiloNewtons). Over a short time period, it uniformly speeds up from an initial velocity of 35 m/s to a final velocity of 60 m/s. Assume that the mass of the rocket is constant during this time period and that the net force is along the direction of motion.


i just need to find out how much time (in sec) it would take for the rocket to go from 35 to 60 m/s???

2007-03-22 09:16:17 · 4 answers · asked by Anonymous

2007-03-22 08:59:48 · 3 answers · asked by Greg 1