Physics - December 2007

Calculate the period of a ball tied to a string of length 0.8 m making 3 revolutions every second.
Answer in units of s.

Calculate the speed of the ball
answer in units of m/s

2007-12-16 12:31:54 · 2 answers · asked by Anonymous

How do you do this problem? Could you please help me out?

http://img84.imageshack.us/img84/411/61849804vo8.jpg

2007-12-16 12:24:18 · 1 answers · asked by Anonymous

2007-12-16 12:04:55 · 2 answers · asked by Anonymous

Non-Newtonian Fluid?
THANKS GUYS.

2007-12-16 11:59:48 · 1 answers · asked by Anonymous

I just havea question about hooke's law of contant, what does it mean when u have a greater value for your constant, k or a smaller value?

2007-12-16 11:17:46 · 1 answers · asked by Anonymous

2007-12-16 11:00:43 · 1 answers · asked by nester w 1

2007-12-16 10:59:47 · 4 answers · asked by splintercell13@verizon.net 2

A car and driver weighing 6010 N passes a sign stating "Bridge out 33.9 m ahead." She slams on the brakes, and the car decelerates at a constant rate of 14.6 m/s/s
The acceleration of gravity is 9.8 m/s/s
What is the magnitude of the work done stopping the car if the car just stops in time to avoid diving into the water (in units of J)?

2007-12-16 10:49:06 · 1 answers · asked by Anonymous

A pulsar is a rapidly rotating neutron star that continuously emits a beam of radio waves in a searchlight manner. Each time the pulsar makes one revolution, the rotating beam sweeps across the earth, and the earth receives a pulse of radio waves. For one particular pulsar, the time between two successive pulses is 0.044 s. Determine the average angular speed (in rad/s) of this pulsar.

2007-12-16 10:38:02 · 1 answers · asked by drewman818 1

I need pictures of neon occuring freely in nature! Are the northern lights made up of neon?

2007-12-16 10:35:09 · 3 answers · asked by kitkat 2

what is its max height?
What are its kinetic and potential energies when it has traveled 3/4 of the distance to its maximun height?
What is its velocity at this point?

2007-12-16 10:18:29 · 4 answers · asked by Chris 1

i need to know the motion and force

2007-12-16 10:09:07 · 1 answers · asked by Anonymous

A student sits on a freely rotating stool holding two weights, each of mass 3.01 kg. When his arms are extended horizontally, the weights are 0.91 m from the axis of rotation and he rotates with an angular speed of 0.759 rad/s. The moment of inertia of the student plus stool is 3.01 kg·m2 and is assumed to be constant. The student pulls the weights inward horizontally to a position 0.296 m from the rotation axis. Find the new angular speed of the student. Find the kinetic energy of the rotating system before and after he pulls the weights inward.

Please explaine how you arrived at the answer.

2007-12-16 09:56:22 · 1 answers · asked by K J 1

physical science 10th grade

2007-12-16 09:51:18 · 1 answers · asked by sappapia24 1

2007-12-16 09:51:06 · 1 answers · asked by taylor 1

A fishing line of length 4 m is wrapped around the axle of a wheel. The axle's diameter is 4 cm. One end of the line is attached to a mass of 6 kg. When the mass is released, gravity pulls on it and this causes the axle to rotate. When the line has been completely unwound from the axle, the wheel is rotating at an angular speed of 3 rev/sec. Calculate the moment of inertia of the wheel and axle.

My answer comes out to 1.322 kg m^2/rad^2.

Am I correct? Thanks.

2007-12-16 09:09:01 · 1 answers · asked by labelapark 6

smaller person.

2007-12-16 09:02:55 · 9 answers · asked by Anonymous

The energy in tides is enormous, why is it not being harnessed? I know the rate of flow of water is slow, but it takes massive amounts of energy to move water - say into a bay - and then out again.

I would envision building a dam say 1km from shore - we have the technology - just. Then giant gates with turbines attached would generate almost continuous electricity.

Wind power always was a bad idea and is starting to die, as it deerves to. However tides are constant. Water is heavy. Ever built a small dam on a stream at a beach, and been amazed when you let the water out 30 minutes later? If you haven't, you should try it and see the energy.

This can hardly be an original thought, so is it being tried or is there a more fundamental problem? What am I missing?

2007-12-16 08:59:10 · 3 answers · asked by Anonymous

2007-12-16 08:56:01 · 2 answers · asked by Wattsup! 3

http://s226.photobucket.com/albums/dd11/jackphotos123/?action=view¤t=Wedge-1.jpg

2007-12-16 08:37:43 · 4 answers · asked by Anonymous

(continues question) a pulse of radio waves. For one particular pulsar, the time between two successive pulses is 0.044 s. Determine the average angular speed (in rad/s) of this pulsar.

2007-12-16 08:37:26 · 1 answers · asked by drewman818 1

When does an atom lose an electron?

2007-12-16 08:30:27 · 7 answers · asked by Anonymous

2007-12-16 08:23:52 · 1 answers · asked by *Sandra* 1

I need to know this for a physics exam.

2007-12-16 08:18:10 · 1 answers · asked by sktdiva99 1

I need to know this for a physics exam.

2007-12-16 08:15:23 · 1 answers · asked by sktdiva99 1

What is it? anyone know? Details in Khz and Db would be dandy.
Furhtermore-any ideas on replicating this sound level (other than just screaming quite shrilly) would be fab.
Ok cool...
Merci.

2007-12-16 07:43:22 · 4 answers · asked by Anonymous

Wire cutters are tools with short handles. They are used for cutting thin pieces of wire. Bolt cutters have much longer handles, and they are used for cutting through thick metal bars. Explain as fully as you can why the tools have handels of different lengths.
Thanks
xx

2007-12-16 07:32:13 · 5 answers · asked by Anonymous

# 4 a stationary .14kg ball is struck by a .23 kg ball moving east at 2 ms. After the collision, the .14kg ball has a velocity of .9m/s at a 30 degree angle. What is the velocity of the .23kg ball?

#5. A .50kg ball at rest is struck by a .30kg ball moving west at 5m/s. After the collision, the .30kg ball has a velocity of 3m/s, 200 degree angle. What is the velocity of the .50kg ball?

#6 a 2kg object moves at 4 m/s south. It strikes a 3 kg object at rest. After the collision, the 2kg object has a velocity of 2.5 m/s at a 300 degree angle. What is the velocity of the 3kg object?

please help me

2007-12-16 07:19:45 · 1 answers · asked by Anonymous

For something to be considered a wheel and axle machine, does the axle have to rotate with the wheel?

2007-12-16 07:16:49 · 2 answers · asked by orgulas1 1

2007-12-16 07:09:04 · 2 answers · asked by jim_walks 2