Physics - January 2007

2007-01-25 16:36:37 · 11 answers · asked by niki 1

Some advertising on the front of trucks and buses is printed with the letters reversed. This makes it difficult for me to read.. Why is this done??

2007-01-25 16:33:54 · 6 answers · asked by heyheyhey 2

2007-01-25 16:31:19 · 24 answers · asked by niki 1

How high is Nuclear physics in education level? I willl be a junior next year in high school and i might take this. Is it hard?

2007-01-25 16:27:03 · 1 answers · asked by gowrifleman 2

2007-01-25 16:24:20 · 8 answers · asked by bin25 1

It's something about.. -16m or... something strange.. I forgot the word for this too...

2007-01-25 16:22:34 · 7 answers · asked by SafiMoyo 2

Hello circuit friends, I am not a electronician. I have a transistor BC 549 and a circuit diagram where its symbol is printed but I dont know which one of the three leads is collector or emitter. I have both digital and anlog multimeters. is it possible to find out which is emitter with these? Please help me !

2007-01-25 16:01:44 · 2 answers · asked by Vertiiical Axiiis 2

I mean when they tell u a spefic thing is going 2 happen at a certain day and time. has it really happened to anybody?

2007-01-25 16:00:37 · 22 answers · asked by Lisa Z 1

A hollow tube of length L, open at both ends as shown above, is held in midair. A tuning fork with a frequency fo vibrates at one end of the tube and causes the air in the tube to vibrate at its fundamental frequency. Express your answer in terms of L and fo.

(a.) Determine the wavelength of the sound.

(b.) Determine the speed of sound in the air inside the tube.

(c.) Determine the next higher frequency at which this air column would resonate.


The tube is submerged in a large, graduated cylinder filled with water. The tube is slowly raised out of the water and the same tuning fork, vibrating with frequency fo, is held a fixed distance from the top of the tube.

(d.) Determine the height, h, of the tube above the water when the air column resonates for the first time. Express your answer in terms of L.

2007-01-25 15:28:35 · 2 answers · asked by Scratch22 1

An air puck of mass 0.12 kg is tied to a string revolving in a circle of radius 1.05 m , frictionless table. The other end of the string goes through a hole in the center of the table with a mass of 1.42 kg tied to it. The suspended mass is in equilibrium when the puck revolves.

What is the tension in the string ?

What is the horizontal force acting on the puck ?

What is the speed of the puck ?

2007-01-25 15:12:55 · 1 answers · asked by Anonymous

So I thought of this a few weeks ago. If two planes leave the middle of the US at the same time, traveling in opposite directions towards the coasts, will the one flying west land first since its flying against Earth's rotaion?

2007-01-25 15:05:28 · 5 answers · asked by Warnstedt 2

A 50.0 g bridge 35 cm long is supported at each end and 15 kg are placed on top. Find F1 and F2, find the force exerted by the legs of the bridge. ( it's a triangular bridge). The bridge falls 1.5m sraight down and at max. compresses a spring 0.15.. Find the spring constant.
I know that I have to use components, but I don't know how.

2007-01-25 14:55:16 · 1 answers · asked by Kitana 2

i want to know future is prewriiten or not? if it is prewritten we can't change it but if not we have the power to change it so what are your views have uyou ever experinced any omen before a bad incident

2007-01-25 14:55:07 · 9 answers · asked by anu 1

2007-01-25 14:46:13 · 1 answers · asked by andrew 3

1. A type of mechanical energy that allows you to hear things.
2. If you increase this type of energy, an object gets warmer.
3. Kinetic energy from radios and televisions.
4. Potential energy having to do with how far off the ground an object is.
5. An object that stores and uses electrical energy.

2007-01-25 14:42:25 · 4 answers · asked by Sex Head 1

I'm really not sure how to approach this problem...

An airplane has a mass of 2.0 x 10^6 kg, and the air flows past the lower surface of the wings at 95 m/s. If the wings have a surface area of 1200 m^2, how fast must the air flow over the upper surface of the wing if the plane is to stay in the air? Consider only the Bernoulli effect.

Thanks.

2007-01-25 14:25:38 · 1 answers · asked by nazzyonenine 3

a reflected image in a mirror is inverted left to right but not top to bottom. my left hand appears on the right in a mirror reflected image. But, there is no inversion in the vertical direction...My head and feet don't get inverted...Why ?

2007-01-25 14:20:41 · 14 answers · asked by vg 1

One end of a uniform 4.0-m long rod of weight
w is supported by a cable. The other end rests against the wall, where it is held by friction. The co-efficient of static friction between the walla nd the rod is .50. Determine the minimum distance,x,from point A at which an additional weight w(same as the weight of the rod) can be hung without causing the rod to slip at point A.

i cant find a picture but i hope that someone can truly help me on this problem..i have been working on this for a few days now and its really pissing me off T___T please help

2007-01-25 14:07:49 · 1 answers · asked by Becky 2

2007-01-25 13:38:19 · 6 answers · asked by Anonymous

2007-01-25 13:37:02 · 4 answers · asked by michael r 1

Please help me with these questions and please explain how you got your answers!!! Thanks

1. A honda moving at 100 km/h is 80 km behind a Ford moving in the same direction at 60 km/h. How far does the Honda have to travel before it catches up to the Ford?

2.A spacecraft takes 200 km after being launched to reach the escape speed fro the earth of 11.2 km/s. Find its average accleration in terms of g.

3. A car that is leaking oil at a constant rate is uniformly accelerated from rest starting out just when a drop falls. The frist drop down the road is 0.80 m from the cars starting point. how far from the starting point is the fourth drop?

4. A bus travels 400 m between two stops. It starts from rest and accelerates at 1.5 m/s until is reaches a velocity of 9.0 m/s. The bus continues at this velocity and the decelerates at 2.0 m/s until it comes to a hault. Find the toal time required for the journey.

2007-01-25 13:34:13 · 3 answers · asked by Anonymous

A piece of metal is at the temperature of melting ice, 0C. What is the temperature of a second identical piece of metal that is twice as hot?

2007-01-25 13:32:49 · 4 answers · asked by jonoco 1

What if the universe has always been why does "everything" have to have a beginning they are just a human they will never no that big bang is true. weak theory

2007-01-25 13:15:20 · 5 answers · asked by Doss 2

How much solar energy (kJ) would have to be transferred to a 178.0 foot length of asphalt highway that is 44.5 feet wide and 21.5 centimeters deep in order to raise the temperature 3.50 oC ?


The average density of asphalt is 721 kg/m3


The specific heat of asphalt is 0.920 kJ/kg-oC

2007-01-25 13:10:50 · 3 answers · asked by suraiya a 2

66.7 ml of milk at 19.4oC are added to 458.5 ml of coffee at 94.8oC . What is the final centigrade temperature of this liquid mixture when thermal equilibrium is reached ?


Assume coffee has the same properties as pure water.


The average density of milk is 1032 kg/m3


The specific heat of milk is 1.97 J/g-oC

Enter a numerical answer only, do not inc

2007-01-25 13:09:36 · 1 answers · asked by suraiya a 2

A speedy tortoise can run at .08 m/s, and a hare can run 18 times as fast. In a race, they start at the same time, but the hare stops to rest for 2.7 min, so the tortoise wins by 20 cm. How long does the race take? Answer in units of s.

2007-01-25 13:04:39 · 2 answers · asked by Anonymous

One end of a uniform 4.0-m long rod of weight
w is supported by a cable. The other end rests against the wall, where it is held by friction. The co-efficient of static friction between the walla nd the rod is .50. Determine the minimum distance,x,from point A at which an additional weight w(same as the weight of the rod) can be hung without causing the rod to slip at point A.

i cant find a picture but i hope that someone can truly help me on this problem..i have been working on this for a few days now and its really pissing me off T___T please help

thanks

2007-01-25 13:02:36 · 1 answers · asked by Becky 2

what is the radius of an automobile tire that turns with a frequency of 11Hz and has a linear speed of 20.0 m/s?

2007-01-25 13:00:57 · 3 answers · asked by globesk8er999 1

rad/s about a fixed vertical axis through its center. A 0.349 kg piece of putty is dropped vertically at a point 0.810 m from the cylinder's center of rotation and sticks to the cylinder. What is the final angular speed of the system? Answer in units of rad/s.

2007-01-25 12:56:08 · 2 answers · asked by drdagher89 2

I was able to solve the first part of this problem pretty easily, but I have no idea how to approach part B. Can anyone assist with some guidance? (I'm not looking for an answer as I want to do that myself so I can learn the material). Thanks in advance.

Suppose that the resistance between the walls of a biological cell is 6.00 x 10^9 ohms.

A.) What is the current when the potential difference between the walls is 25 mV?

The answer to this 4.166x10^-12 Amperes.

B.) If the current is composed of Na+ ions (q = +e), how many such ions flow in 0.5 s?

I thought that maybe it had to do with the equation delta q= I(time), but I was apparently wrong.

2007-01-25 12:43:06 · 1 answers · asked by larkinfan11 3