Physics - March 2007

Two resistors A and B are connected in parallel across a 6 V battery. The current throught B is found to be 2 A. When the two resistors are connected in series to the 6 V battery, a voltmeter connected across resistor A measures a voltage of 2 V. Find the resistance of A in units of ohms.

Any help is appreciated. I have a test tomorrow and this is on the review guide and I can't get it. Thank you.

2007-03-04 09:42:02 · 2 answers · asked by Anonymous

Ok, I messed up my earlier question. I know white clothing, bodily fluids, and jewelry shows up under a black light. I want to know what chemicals do the same, and I don't want a "why it works" answer.

2007-03-04 09:39:47 · 3 answers · asked by Ryan O 2

how about monoskiing, barefoot waterskiing and wakeboarding. I understand that some need to be faster than others - i.e. the greater the area, the slower the speed, but how fast do you really need to go? Can I waterski at 20 knots?

2007-03-04 09:37:47 · 3 answers · asked by CFS 2

A solid sphere of mass 4.0 kg and radius 0.12m is at rest at the top of a ramp inclined 15(degrees). It rolls to the bottom without slipping.The upper end of the ramp is 1.2 m higher than the lower end. Find the sphere's total kinetic energy when it reaches the bottom.

How do I find the linear speed in this problem?

2007-03-04 09:37:16 · 2 answers · asked by Anonymous

a.) What current passes through the body when the person accidentally is connected to 220 V?
I know the answer to this question is 0.239 A, but the next two, I do not. That's where you come in!

b.) If there is an alternative path to ground whose resistance is 46 ohms, what current passes through the person?
I don't know what happens when there is resistance in the ground...

c.) If the voltage source produces 1.5 A, how much current passes through the person in case (b)?

Please help. Thank you.

2007-03-04 09:35:11 · 2 answers · asked by abc123 1

2007-03-04 09:33:13 · 6 answers · asked by Zefram 2

If there are two objects that are magnetically attracted to one another, will glass interfere with the attraction?

- What materials will NOT interfere...?
- What materials will COMPLETELY interfere with and disrupt the attraction?

2007-03-04 09:29:35 · 3 answers · asked by Anonymous

2007-03-04 09:27:23 · 4 answers · asked by endgame1915 3

I need a list of household items that are attracted to a common household magnet (one that sticks on a refrigerator).

2007-03-04 09:26:44 · 2 answers · asked by Anonymous

how to find acceleration of a box sliding on a rough horizontal table?

in term of mu_k , mu_s , m , g

I need an expression for the acceleration of the box in those terms

2007-03-04 09:13:49 · 1 answers · asked by RelientKayers 4

2007-03-04 09:03:05 · 2 answers · asked by timotheusametheus 1

I am familiar with Einstein's theories and how as you approach the speed of light, it alters these dimensions. I am more concerned with perception of dimension by the human brain and whether time is perceived the same way as the other three dimensions (this may be subjective).

2007-03-04 08:55:01 · 5 answers · asked by misoma5 7

A space vehicle is traveling at 5900 km/h relative to the Earth when the exhausted rocket motor is disengaged and sent backward with a speed of 93 km/h relative to the command module. The mass of the motor is four times the mass of the module. What is the speed of the command module relative to Earth just after the separation?

2007-03-04 08:46:30 · 1 answers · asked by x2carlosp 2

If 4 Hydrogen nuclei fuse to form a Helium atom, there is a mass defect. I.e. the mass of the Helium atom is leass than that of the 4 Hydrogen atoms. Now, I understand that this is because some of the mass is converted into the energy needed to keep the helium nucleus together. Thus that accounts for the missing mass - if this is the case then where does the energy come from that is given off in fusion??

2007-03-04 08:10:46 · 2 answers · asked by Anonymous

2007-03-04 07:56:31 · 1 answers · asked by Jaime 2

2007-03-04 07:56:22 · 1 answers · asked by Jaime 2

It's a term I caught in my 9th grade history text. If someone could give me a brief description of what the theory of relativity is, that would be terrific.

2007-03-04 07:30:03 · 1 answers · asked by sparklycrayons 1

I need a site that simply explains Cantor's theory of diagonalization. Any ideas?

2007-03-04 07:16:29 · 1 answers · asked by platypus 2

A length of wire is cut into five equal pieces. The five pieces are then connected in parallel, with the resulting resistance being 61.0 ohms. What was the resistance of the original length of wire before it was cut up?

The answer I first arrived at was 305 but I am positive that this is not the right answer.

2007-03-04 07:04:03 · 4 answers · asked by infinitesnowboy 2

2007-03-04 07:02:29 · 5 answers · asked by coolness 2

i do not get what means "gravity exists because matter exists"
like, i understand what is gravity. It is the force or attreraction between the object and the earth because we have gravitational force which pull everything towards the centre of the earth

but when we say the attraction etween two objects, for example, a pen and a book on the same table, there is still an attraction between the two. Why and what causes this attraction ?

2007-03-04 06:49:08 · 3 answers · asked by kawaiio 1

Pulleys- some questions I can't understand?
1) How does increasing the load affect the ideal mechanical advantage and efficiency of a pulley system?


2) How does increasing the number of pulley affect the ideal mechanical advantage and efficiency of a pulley system?

2007-03-04 06:48:30 · 2 answers · asked by Jane A 3

In the South West part of the country. ( the desert ).

2007-03-04 06:38:13 · 4 answers · asked by Anonymous

2007-03-04 06:34:41 · 2 answers · asked by Cami 1

A spring-loaded toy gun is used to shoot a ball of mass m= 1.50kg straight up in the air.The spring has spring constant k=677N/m . If the spring is compressed a distance of 25.0 centimeters from its equilibrium position y=0 and then released, the ball reaches a maximum height (measured from the equilibrium position of the spring). There is no air resistance, and the ball never touches the inside of the gun. Assume that all movement occurs in a straight line up and down along the y axis.

1) Find v_m the muzzle velocity of the ball (i.e., the velocity of the ball at the spring's equilibrium position y=0 ).

2) Find the maximum height h_max of the ball.

Please help me thank you

2007-03-04 06:32:31 · 1 answers · asked by Anonymous

1. A centrifuge rotator has a moment of inertia of 0.0315 kgm^2. How much energy is required to bring it from rest to 8000 rpm?

2. A merry-go-round has a mass of 1640 kg and a radius of 8.2 m. How much net work is required to accelerate it from rest to a rotation rate of one revolution rate of one reveolution in 8.00 s?

2007-03-04 06:23:25 · 1 answers · asked by metsfan1990 2

2007-03-04 06:07:22 · 2 answers · asked by juliandbn 1

2007-03-04 06:06:34 · 2 answers · asked by juliandbn 1

2007-03-04 06:05:20 · 1 answers · asked by juliandbn 1

An electron is accelerated by a constant electric field of 300N/C. Use the equations with constant acceleration to find the electron's speed after 1.00x10^-8s, assuming it starts from rest.

2007-03-04 05:41:39 · 2 answers · asked by Anonymous