Physics - March 2007

2007-03-05 13:36:37 · 14 answers · asked by greenbergfour 2

The front and rear sprockets on a bicycle have radii of 9.00 and 5.10 cm, respectively. The angular speed of the front sprocket is 6.40 rad/s. Determine the following.
The linear speed of the chain as it moves between the sprockets.
(b) The centripetal acceleration of the chain as it passes around the rear sprocket.

2007-03-05 13:23:08 · 1 answers · asked by dawgs1918 1

pls. help me to answer that question... tnx,,, god bless all

2007-03-05 13:21:36 · 4 answers · asked by erna 1

The earth orbits the sun once a year (3.16 107 s) in a nearly circular orbit radius 1.50 1011 m. With respect to the sun, determine the following.
(a) the angular speed of the earth
b) the tangential speed of the earth
the magnitude and direction of the earth's centripetal acceleration
magnitude

2007-03-05 13:19:39 · 2 answers · asked by dawgs1918 1

2007-03-05 13:12:17 · 5 answers · asked by Anonymous

Heres a crappy diagram of what the problem looks like:
<----[12kg]----[20kg]----[16kg...

Three boxes are tied together and are pulled forward on a frictionless surface by a rope with a tension of Ft=12N.

a) Write Newtons 2nd law equation for the horizontal forces on each box individually. (No numbers allowed)

b) Solve your three Newton's law equations for the acceleration of each box and the tension in each string. (Find numerical answers (with proper units.)

Any help? Im not sure what to do
Additional Details

The last box is 16kg since it cut the end of it off

2007-03-05 13:09:51 · 3 answers · asked by farxfromxlonelyx 1

The capacitance of a portion of a circuit is to be reduced from 4800 pF to 3000 pF. What capacitance can be added to the circuit to produce this effect without removing existing circuit elements?

2007-03-05 13:07:22 · 1 answers · asked by Anonymous

#1) A child holds a sled on a frictionless, snow-covered hill,
inclined at an angle of 30 degree.
If the sled weighs 74N.find the force exerted on the rope by the child. in units of N
What force is exerted on the sled by the hill? units N

#2)There is friction between the block and the table.
The suspended 3kg mass on the left is moving
up, the 3kg mass slides to the right on the table,
and the suspended mass 6 kg on the right is
moving down.
The acceleration of gravity is 9.8m/s^2
What is the magnitude of the acceleration of the system?
in units m/s^2

2007-03-05 13:04:42 · 2 answers · asked by elquida25 1

are the walls actually deformed as they act as a membrane ?
Similarly, puzzling, if you hear a cicadee chirp outside a glass window, it is generating enough energy to vibrate your window glass, right ? I'm asking bec. I dropped out of h.school prior to acoustics, and it seems puzzling that such heavy objects act as membranes w. so little energy input.

2007-03-05 13:00:21 · 1 answers · asked by kim j 1

#1) A force is applied to a 1.6 kg mass and produces 2.8 m/s^2 acceleration.
What acceleration would be produced by the same force
applied to a 14.5 kg mass? in units of m/s^2.
#2)A dragster and driver together have mass 892.3kg .The dragster, starting from rest, attains a speed of 25.9 m/s in 0.6s.
Find the average acceleration of the dragster during this
time interval. in units of m/s^2 .
What is the size of the average force on the dragster
during this time interval? in units of N
The driver has a mass of 77.8 kg. What horizontal force does the seat exert on the driver? in units of N
#3)A person of mass 72.3 kg escapes from a burning building by
jumping from a window situated 38.9 m above a catching net. The acceleration of gravity is 9.8m/s^2. If air resistance exerts a force of 85.3 N on him as he falls, determine his speed just before he hits the net. in units of m/s.

2007-03-05 12:58:05 · 3 answers · asked by elquida25 1

1) What are two types of electricity? 2) What causes electricity?

2007-03-05 12:55:36 · 2 answers · asked by athlete473 2

A. How many joules of energy does a 100-watt light bulb use per hour?
i got the answer to be 3.60*10^5J

but i need help with part B

B.How fast would a 67.0kg person have to run to have that amount of energy?

2007-03-05 12:54:34 · 3 answers · asked by ♡♥EM♡♥ 4

If you drop a hot rock into a pail of water, the temperature of the rock and the water will change until both are equal. The rock will cool and the water will warm. Does the same principle hold true if the rock is dropped into a large lake? Explain.

2007-03-05 12:38:49 · 1 answers · asked by hintzruby 1

I know this may sound wierd and not possible but I think that the Bermuda Triangle is a secret government facility that they do testing in. I mean come on how could water pressure bring a plane down. I want to hear your theorys and what you think of mine. Also an underwater facility is possible they already have one known as Area 19.

2007-03-05 12:28:21 · 5 answers · asked by Poster 2

Heres a crappy diagram of what the problem looks like:
<----[12kg]----[20kg]----[16kg...

Three boxes are tied together and are pulled forward on a frictionless surface by a rope with a tension of Ft=12N.

a) Write Newetons 2nd law equation for the horizontal forces on each box individually. (No numbers allowed)

b) Solve your three Newton's law equations for the acceleration of each box and the tension in each string. (Find numerical answers (with proper units.)

Any help? Im not sure what to do
Additional Details

41 minutes ago
The last box is 16kg since it cut the end of it off

2007-03-05 12:22:55 · 1 answers · asked by farxfromxlonelyx 1

2007-03-05 12:16:34 · 1 answers · asked by turtlesoup331 1

Please help me!

2007-03-05 12:15:17 · 1 answers · asked by Tim B 1

This wave consists only of an electric field, with no magnetic field accompanying it. You are certain that the engineer is mistaken because????

2007-03-05 12:09:03 · 2 answers · asked by Anonymous

In the air over a particular region, at an altitude of 500 m above the ground, the electric field is 150 N/C directed downward. At 600 m above the ground, the electric field is 80 N/C downward. What is the average volume charge density in the layer of air between these two elevations?

2007-03-05 11:58:30 · 1 answers · asked by Victoroza 1

I was wondering if there is a heavy crate that accidently falls from a high-flying airplane just as it flies directly above a red car parked in a car lot, relative to the car, where will the crate crash?

2007-03-05 11:46:10 · 3 answers · asked by questionhere 2

Does anyone out there hold the position that string theroy is background independent? This has never been made clear to me, although i have seen some very convincing arguments that it is background-dependent, and because of this ST does not deserve all the money and man power it has received in the last 20 years.

2007-03-05 11:44:18 · 1 answers · asked by showtime 1

If you lay a steel needle horizontally on water, it will float. If you place the needle vertically into the water, it will sink. Why is thsi?

2007-03-05 11:42:59 · 2 answers · asked by kangball15 2

2007-03-05 11:35:52 · 1 answers · asked by Anonymous

Heres a crappy diagram of what the problem looks like:
<----[12kg]----[20kg]----[16kg]

Three boxes are tied together and are pulled forward on a frictionless surface by a rope with a tension of Ft=12N.

a) What are all the forces in this problem?

b) which of the boxes will have the greatest acceleartion?

c) Which of the ropes between the boxes will have the largest tension?

2007-03-05 11:35:12 · 1 answers · asked by farxfromxlonelyx 1

2007-03-05 11:31:56 · 2 answers · asked by osinamunatum 2

He jumps off a cliff 27m above the water and has a mass of 80kg.

2007-03-05 11:31:52 · 2 answers · asked by damigurl05 1

Is it a good idea to double major in math and physics? I am most interested in applied physics. Is it worth it to get a double major, or is it just something that is "nice" to have when applying for grad school?

I am a sophmore, and am ready to dig in to my major.

Thanks.

2007-03-05 11:30:01 · 5 answers · asked by Anonymous

2007-03-05 11:23:58 · 1 answers · asked by clara 1

A fish rests on the bottom of a bucket of water while the bucket is being weighed. When the fish begins to swim around does the reading on the scale change?

2007-03-05 11:20:53 · 3 answers · asked by kangball15 2

To profile a flux of a reactor, we irradiated a copper wire. However, the wire was put in the reactor offline. I have a chart of the powering up to a constant flux. Problem is the powering up term.. I know the basic equation, but flux*Exp[ omega * t], but I am not sure how to determine the constant. I was thinking of treating the time it took to power up as a stable period b/c the omega is equal to the inverse of the period. It was suggested to use a straight line from the constant flux extrapolated to zero, but the omega would depend on flux and makes the resulting activtion equation by a the flux insolvable. Would my assumption of treating the power up time as a stable period valid. That would make omgea indepent of flux.

2007-03-05 11:18:35 · 1 answers · asked by Anonymous