Physics - February 2007

where the fuel is burned and a sink temerature of 720k.

2007-02-25 13:31:53 · 1 answers · asked by Eric 1

(a) Six 5.4 µF capacitors are connected in parallel. What is the equivalent capacitance?
answer should be in µF
(b) What is their equivalent capacitance if connected in series?
answer should be in µF

2007-02-25 13:29:45 · 3 answers · asked by ZG786 1

A 220 pF capacitor is connected in series with an unknown capacitance, and as a series combination they are connected to a battery with an emf of 28.0 V. If the 220 pF capacitor stores 125 pC of charge on its plates, what is the unknown capacitance?
answer should be in pF

2007-02-25 13:28:04 · 1 answers · asked by ZG786 1

2007-02-25 13:24:30 · 1 answers · asked by Anonymous

The passengers in a roller coaster car feel 50% heavier than their true weight as the car goes through a dip with a 30.0 m radius of curvature.
What is the car's speed at the bottom of the dip?

2007-02-25 13:19:10 · 1 answers · asked by Craig P 2

Three equal charges 4.3 uC are located in the xy-plane, one at (0 m, 31 m), another at (69 m, 0 m), and the third at (60 m, -62 m).

2007-02-25 13:18:34 · 2 answers · asked by fires 1

Question: a piece of copper wire is formed into a single circular loop of radius 12 cm. a magnetic field is oriented parallel to the normal to the loop, and it increases from 0 to 0.60 T in time of 0.45 s. the wire has a resistance per unit length of 3.3 x 10^-2 ohms/m. what is the avg. electrical energy dissipated in the resistance of the wire?

My Approach: I found the area using the radius...A = .0144 m^2 and then found L using the radius....L = .75 m

Then, I used this equation to determine emf... Emf = (BA - initial BA)/ change(time)

Emf = (.60)(.0144) - 0/ 0.45 = .0192 V

Next, I found resistance by multiplying the L to ohms/L value:

R = 3.3 x 10-2 ohms/m (.75m) = .025 ohms

Then I found current using V = IR:

I = .0192V/.025 ohm = .768A

Then I plugged to P = IV (to find power):

P = IV = (.768)(.0192) = .0147 J/s

Then I multipilied by time to get the energy:

.0147 J/s (.45 s) = .0066J ---- THAT'S THE ANSWER!

Again, just rectify my approach and correct what is wrong!

2007-02-25 13:16:37 · 2 answers · asked by Jimmy 3

I heard that it is in March

2007-02-25 13:12:58 · 1 answers · asked by Malik 4

2007-02-25 13:09:40 · 4 answers · asked by Tim H 1

ok if time is relative and thinking takes time then thinking is relative?

then thinking in a higher dimension is not necessary so that immediately makes you all knowing?

2007-02-25 13:06:40 · 3 answers · asked by stronger_than_satan1 2

In terms of substances, why is evaporation of water a physical change and not a chemical change?

2007-02-25 12:58:39 · 7 answers · asked by HELLO123 3

.. then how large a solar cell is needed if there is sunlight only 12 hours a day?

2007-02-25 12:53:34 · 4 answers · asked by PhysicsHelp 1

Don't just search it. Use physics techniques if possible.

2007-02-25 12:53:08 · 4 answers · asked by Craig P 2

The water is not frozen, it is not in zero gravity (space) and it is not spun fast enough to keep the water in the bucket. How is this possible?

2007-02-25 12:49:50 · 11 answers · asked by Nothing rhymes with orange 1

If a man has an average useful power output of 40.0 W, what minimum time would it take him to lift thirty 14-kg boxes to a height of 1.2 m? The value of g is 9.80 m/s^2.

2007-02-25 12:49:27 · 1 answers · asked by Anonymous

A submarine of mass 2.1 *10^6 kg and initially at rest fires a torpedo of mass 260 kg. The torpedo has an initial speed of 100.9 m/s. What is the initial recoil speed of the submarine? Neglect the drag force of the water.

2007-02-25 12:48:40 · 2 answers · asked by Anonymous

A 1000-kg car moving at 10 m/s brakes to a stop in 5 s. The average braking force is...

How do I solve this?

2007-02-25 12:39:02 · 3 answers · asked by angelgirl 2

does the photoelectric effect prove that light is made of particles? do inference experiments prove that light is composed of waves?(is there a distinction between what something is and how it behaves)

2007-02-25 12:34:43 · 4 answers · asked by Anonymous

How ca you calculate the mass of a planet?

2007-02-25 12:29:40 · 2 answers · asked by Anonymous

I know that magnets are stronger when they are colder and become weaker as they increase in temperature. Can anyone explain to me why this happens? THX!

2007-02-25 12:28:10 · 2 answers · asked by Anonymous

A stone of mass m is attached to a stong string and whirled in a vertical circle of radius R. At the exact top of the path, the tenstion in the string is three times the stone's weight.
At this point the stone's speed is...A.) 2Sqrt(gR) B.) Sqrt(2gR) C. 3Sqrt(gR) or D. Sqrt(3gR)
I thought the answer was B but the answer is A. How is this so?

2007-02-25 12:21:11 · 2 answers · asked by megwiz12 2

How do you make gold? Yes, I'm talking about alchemy, also known as nuclear physics.

2007-02-25 12:13:09 · 8 answers · asked by Anonymous

this is a cooling problem: A thermometer is removed from a room where the air temperature is 70 degree fahrenheit to the outside where the temperature is 10 degrees fahrenheit. After 1/2 minute the thermometer reads 50 degrees fahrenheit. What is the reading at t=1 minute? How long will it take for the thermometer to reach 15 degrees fahrenheit?

2007-02-25 12:04:22 · 1 answers · asked by biscuits 2

2007-02-25 12:01:33 · 12 answers · asked by Anonymous

You testify as an "expert witness" in a case involving an accident in which car A slid into the rear of car B, which was stopped at a red light along a road headed down a hill (Fig. 6-27). You find that the slope of the hill is = 12.0°, that the cars were separated by distance d = 26.0 m when the driver of car A put the car into a slide (it lacked any automatic anti-brake-lock system), and that the speed of car A at the onset of braking was v0 = 17.5 m/s.

im getting all kinds of answers w/ v^2= vo^2 + 2a(x), all wrong

2007-02-25 11:52:48 · 3 answers · asked by Anonymous

Two small spheres, each with a mass m=5.0 g and charge q, are suspended from a point by threads of length L=0.30 m. What is the charge on each spere if the treads make an angle theta = 20 degrees with the vertical?

2007-02-25 11:52:11 · 1 answers · asked by Anonymous

2007-02-25 11:49:53 · 6 answers · asked by callaway1010 2

how far away is the other ship if the speed of sound in seawater is 1,530.0m/s?

2007-02-25 11:49:37 · 1 answers · asked by Connie L 1

what is the wave velocity?

2007-02-25 11:45:36 · 2 answers · asked by Connie L 1

temperature is 20.0 C, how many meters are you from the ship?

2007-02-25 11:42:00 · 1 answers · asked by Connie L 1