Physics - November 2007

For intro physics level, the depth of a region of water is increased, the propagation speed of waves through this region increases. Is the frequency in this region changed? I know that frequency changes with changes in media, and that you still have the same water, but does changing depth constitute a change in the medium?

2007-11-29 04:15:48 · 4 answers · asked by CH 1

If the ring is dropped into boiling water, what will be the change in the inner diameter of the ring?

2007-11-29 04:10:12 · 1 answers · asked by Pascal 4

true or false

2007-11-29 04:01:50 · 10 answers · asked by Anonymous

I need 6 examples of Newton's 3 laws being shown in the movie

2007-11-29 03:47:47 · 2 answers · asked by S Z 2

1 moles of an ideal gas at T =313K is cooled down in an isovolumetric process and as a consequence the pressure drops for a factor of 2.1. After that the gas expands in an isobaric process till the initial temperature T is reached. Calculate the amount of heat (in kJ) absorbed by the gas during the whole process.

2007-11-29 03:47:27 · 1 answers · asked by Anonymous

One mole of an ideal gas is heated for Δ T = 74 K in an isobaric process. During the process the gas absorbed Q = 1,689 J of heat. Calculate the change of its internal energy. Enter your answer in scientific notation with 3 sig. fig.

2007-11-29 03:46:55 · 1 answers · asked by Anonymous

A m=5 kg weight is dropped from height h =1.9 m onto a cart containing sand , mass M= 29 kg, initially moving at horizontal speed v= 2.1 m/s. How much heat is released in the process ?

2007-11-29 03:46:23 · 1 answers · asked by Anonymous

Around 1660 s the thermometers in Florence, Italy, were made so that 50 oFl correspond to 44 oR (Rheomir scale) and 0 oFl = -15 oR. On the other hand , on the Rheomir scale water freezes at 0 oR and boils at 80 o R. Find the value of 74 oFl on the Celsius scale.

2007-11-29 03:45:12 · 1 answers · asked by Anonymous

Of course I know it is because there is nothing making it go back given that there is no wind and indeed the mosquito is flying relative to the cars velocity. Nevertheless when a person is travelling in a really fast car why do we tend to get sucked into the seat, I mean I know it is because of inertia, but still why doesnt the same principle apply to the mosquito and make it go to the back of the car?

2007-11-29 03:31:19 · 5 answers · asked by feelingtherain 2

Maybe u r not gonna understand the question...
but try,i didn't understand it..
i think it's something dealing with clock wise and anticlock wise!!!

2007-11-29 02:57:51 · 0 answers · asked by Princess of Death 1

An air puck of mass 0.25 kg is tied to a string and allowed to revolve in a circle of radius 1.0 m on a frictionless horizontal table. The other end of the string passes through a hole in the center of the table, and a mass of 1.0 kg is tied to it. The suspended mass remains in equilibrium while the puck on the tabletop revolves.

(a) What is the tension in the string?

(b) What is the horizontal force acting on the puck?

(c) What is the speed of the puck?

2007-11-29 02:55:58 · 1 answers · asked by Anonymous

2007-11-29 02:42:33 · 3 answers · asked by KUSH 1

2007-11-29 02:20:43 · 11 answers · asked by Anonymous

to keep the box moving across the floor at a constant velocity?

2007-11-29 01:41:46 · 2 answers · asked by lana l 1

2007-11-29 01:39:30 · 0 answers · asked by om_chessking 2

A stone is thrown at an angle of 30.0° above the horizontal from the top edge of a cliff with an initial speed of 12 m/s. A stopwatch measures the stone’s trajectory time from the top of the cliff to the bottom at 5.60 s. What is the height of the cliff? (Assume no air resistance and that a ^y= -g = -9.81 m/s^2.)

2007-11-29 01:34:00 · 1 answers · asked by Anonymous

i mean forces acting on the rock

2007-11-29 00:59:10 · 8 answers · asked by Anonymous

2007-11-29 00:53:49 · 5 answers · asked by Anonymous

A hot air balloon is 80 m above the ground and travelling vertically downards at 8.0 m/s when one of the passengers accidently drops a coin over the side. How long after the coin reaches the ground does the balloon touch down?


Ok so i assume ur supposed to find the landing times of both. So for the hot air balloon, since it's travelling at 8m/s and there's 80 metres to go, it'll take 10 seconds to reach ground. Is that right?

Then for the coin i can't figure out how to get the time. Which equation of motion do you use?
u = 8m/s
x = 80 or is it -80?
a = 9.8m/s^2

do you use x = ut + .5at^2? That's the only equation with all the values that I have but then you'd have to work out 't' as a quadratic equation.

I dunno maybe i'm getting the theory wrong and just not understanding this topic.

Any ideas on how to do it?


Thanks!!

2007-11-29 00:11:29 · 5 answers · asked by Anonymous

If the speed of light is the same if we move or not, according to Einstein, then why do we see a redshift if the light source is moving away at great speed? Or am i confusing speed with wavelength now?

2007-11-28 23:38:46 · 2 answers · asked by me c 2

2007-11-28 23:13:10 · 3 answers · asked by Adrian 1

hoe ll we modify the relation of the phase difference...

2007-11-28 21:03:38 · 1 answers · asked by zaeee 1

In a slow-pitch softball game, a 0.200 kg softball crossed the plate at 11.00 m/s at an angle of 45.0° below the horizontal. The batter hits the ball toward center field, giving it a velocity of 46.0 m/s at 30.0° above the horizontal.

(a) Determine the impulse delivered to the ball.
_____ N·s (magnitude)
_____ ° (above the horizontal)

(b) If the force on the ball increases linearly for 4.00 ms, holds constant for 20.0 ms, then decreases linearly to zero in another 4.00 ms, what is the maximum force on the ball?
_____ N (magnitude)
_____ ° (above the horizontal)

2007-11-28 19:36:28 · 1 answers · asked by shawtyy 1

The displacement of a particle at t = 0.300 s is given by the expression x = (5.00 m) cos(3.00t + 1/2), where x is in meters and t is in seconds.
(a) Determine the frequency and period of the motion.
Hz
s
(b) Determine the amplitude of the motion.
m
(c) Determine the phase constant.
rad
(d) Determine the displacement of the particle at t = 0.300 s.
m

2007-11-28 18:57:25 · 1 answers · asked by LOWDOWN 1

please explain in an easily understandable way. thanks!

2007-11-28 18:33:11 · 5 answers · asked by stop global warming!!! 1

if so how

2007-11-28 18:11:41 · 7 answers · asked by Anonymous

Velocity, mass, angle, acceleration, ect....

2007-11-28 17:33:09 · 1 answers · asked by Michaela G 1

looking for some funny and serious answers...
go on n spill ur creative answers....

2007-11-28 16:44:39 · 38 answers · asked by bunchrockers 2

14-20, please help, thanks!

2007-11-28 16:42:50 · 2 answers · asked by Kiwikahuna 2

14-17) Is the acceleration of a simple harmonic oscillator ever zero? If so, when? What about a damped harmonic oscillator?

please help, thanks!

2007-11-28 16:34:10 · 2 answers · asked by Kiwikahuna 2