Physics - October 2006

This is the exact wording of the question...my teacher likes to give minimum info:

A cannon is fired horizontally off a cliff that is 65 m from the plain below. Its initial velocity is 75 m/s. Find the (A) time of trip, (B) horizontal distance traveled, and (C) final resultant velocity.

Then, it says....the initial velocity is decreased to 7.5 m/s. Which of the above numbers will not change with this decrease?
A
B
C
(as above)

2006-10-11 10:02:19 · 4 answers · asked by Anonymous

2006-10-11 10:01:37 · 6 answers · asked by muffingirl 1

ok well morely my friends were having a discussion and they were all being mean the friend of mine who doesn't think you can. he was trying to prove with with some talk about kinetic and potential energy and they accused him of trying to be smarter than he was. so i want to know is it possible to fall *up* the stairs. if not, i can disprove the other people and they'll have to apologise for being mean to my other friend. =]

2006-10-11 10:00:32 · 4 answers · asked by Anonymous

In an exothermic chemical reaction, how is energy released? Usually it is simply expressed as reactants -> product + energy. But how is that energy emitted?

I understand the release of electromagnetic energy through photons, but what other vehicles are there? Do the molecules gain random kinetic energy? Is it vibrational energy (phonons)?

2006-10-11 09:45:07 · 2 answers · asked by AskBrian 4

Find:
(a)
the centripetal force
(b)
the coefficient of friction if there is no banking to the curve
(c)
the banking angle if there is no friction

2006-10-11 09:44:57 · 3 answers · asked by Anonymous

2006-10-11 09:44:45 · 2 answers · asked by hmmm 1

Find the orbital velocity of a satellite at this altitude....

any help is appreciated....

2006-10-11 09:42:04 · 1 answers · asked by Anonymous

passed over a frictionless pulley.
Find the acceleration of the system and the tension in the string if the surface is:
(a)
smooth, and
(b)
the coefficient of friction is 0.190

2006-10-11 09:38:19 · 3 answers · asked by Anonymous

Find:
(a)
The force parallel to the plane,
(b)
The acceleration if there is no friction,
(c)
The coefficient of friction if the object is just at the point of sliding,
(d)
The acceleration of the block if the coefficient of sliding friction is 0.280

2006-10-11 09:35:53 · 2 answers · asked by Anonymous

i am looking for anyone that has information or experiences on the concept of time travel, healing, energy vs matter - wherever you are - that is what i want to know about. thank you for the light.

be playful and open with your answers. can you see the dolphins?

2006-10-11 09:35:10 · 2 answers · asked by annie - rainbow goddess 4

What is the largest piece of matter that will exibit wave/partical dualality in a double slit experiment? I know a photon, electron, neutron, proton, and ion, an atom, well how bout an molecule? I heard it stated in a documentary that even mulitple atom molecules exhibit duality....so it is not just light or e.m. energy or quanta that exihibit w.p.d. as is usually taught...what are the implications of this distinction. Thanks ya'll I am a shadetree quantum mechanic and its probably a good thing particle accelerators are so hard to build!

2006-10-11 09:32:01 · 5 answers · asked by akamadscientist 1

Must be top secret; Can't find a single website that explains the process... Can you? Please?

2006-10-11 09:25:49 · 2 answers · asked by nowyermessingwithasonofabitch 4

2006-10-11 09:25:14 · 3 answers · asked by STORMY K 3

A 7.50 kg block is resting on a horizontal surface, and is connected to a 5.50 kg mass suspended from a string passed over a frictionless pulley.
Find the acceleration of the system and the tension in the string if the surface is:
(a)
smooth, and
(b)
the coefficient of friction is 0.190

2006-10-11 09:23:22 · 2 answers · asked by helpmewithphysics 1

A block weighing 80 lbs is on a 32.2 degree inclined plane.
(a)
What is the force parallel to the plane?
(b)
What is the acceleration if there is no friction?
(c)
What is the coefficient of friction if the object is just at the point of sliding?
(d)
Find the acceleration of the block if the coefficient of sliding friction is 0.280.

Any help is greatly appreciated....

2006-10-11 09:20:32 · 1 answers · asked by helpmewithphysics 1

Ok.....they give you an initial velocity that a cannon ball is fired out of a cannon from and they give you a height for a cliff. They make you solve for time, horizontal distance, and final resultant velocity. They then ask, which of the following will be UNAFFECTED by a decrease in initial velocity.

Atime
Bhorizontal distance
Cfinal resultant velocity


I wasn't sure. I thought it was B, my friend said it's A and then I changed my mind but I'm still not completely sure...some people also said it's C, but for some reason I don't think it's C....any thoughts?

2006-10-11 09:17:31 · 8 answers · asked by Anonymous

I heard that nothing could practically travel at the speed same as light. But it is theoritically proved that even if someone/something could actually travel that fast, Time wouldn't have any effect on it/him.

Interestingly, if someone travels at more speed than light, Time would go backwards for him. So the speed of light is a constant speed, a zero point, and related to time.

My question is, is all this true? or partly true? Anyone shed some light on it if know about it?

2006-10-11 09:04:15 · 11 answers · asked by Legend 3

How much does it cost per hour to run an 11W energy saving bulb? How does this compare to a normal 100W light bulb.

2006-10-11 08:59:33 · 10 answers · asked by the demon 1

The National Transportation Safety Board is testing the crash-worthiness of a new car. The 2300 kg vehicle, moving at 15 m/s, is allowed to collide with a bridge abutment, which stops it in 0.56 s. What is the magnitude of the average force that acts on the car during the impact? Can you explain your answers?

2006-10-11 08:52:02 · 2 answers · asked by Anonymous

Suppose that your mass is 80 kg. How fast would you have to run to have the same translational momentum as a 1600 kg car moving at 1.2 km/hr? Can you explain what would be the steps to solve this problem?

2006-10-11 08:48:55 · 1 answers · asked by Anonymous

i need help creating a paper plane for a project.if you have any ideas or tips how to build a paper plane please tell how to fold each fold. thank you!

2006-10-11 08:48:35 · 3 answers · asked by iana0895 3

Electricity is the flow of free electrons in a closed circuit. The circuit starts at the electricity company and I (basically) get charged for the number of electrons that enter my property through the meter, But if the electricity company is getting their electrons back (because of the closed circuit) then why do we get charged for the electricity that we 'use' ?

2006-10-11 08:28:05 · 14 answers · asked by Anonymous

2006-10-11 08:14:30 · 3 answers · asked by hmmm 1

Studied all week and then he gives a 4 problem equation; 3 problems and 1 multiple choice??? THE MULTIPLE CHOICE IS WORTH AS MUCH AS THE PROBLEM EQUATIONS?!??!

Oh, and no values, which shouldnt make it any harder but too used to working with numbers.

Answers were given in h, g, theta, d, a, v, x, y. Damn kinematics......?

2006-10-11 08:13:59 · 5 answers · asked by leikevy 5

always huge amount of water heads towards sea or water pond. defenitely we can convert this energy into power. anybody got idea ?. What I feel is running water ( it is not necessary fall from high elevation) ................ all type of sugestions are requested.

2006-10-11 08:09:24 · 2 answers · asked by svs power 2

i don't want a very scientifical answer. i need a definition that a 13-year-old could understand.

2006-10-11 08:04:05 · 8 answers · asked by jomama1234 2

To produce electricity to suppy power to part of the club? apparently there are certain alloys that can produce electriciy when they are squeezed.

2006-10-11 07:38:55 · 7 answers · asked by Anonymous

When a voltage of 4.5V is applied across a lightbulb,a current of 120mA passes thru its filament. What is the resistnace of the bulb and the power disappated in it?

I have no thoughts on where to begin on this one.

I WILL chose a BEST ANSWER....

2006-10-11 07:28:52 · 5 answers · asked by BugGurl 3

2006-10-11 07:27:45 · 25 answers · asked by Wing commander 3

A sphere rolls on a smooth plane with angular velocity omega. What is the angular momentum of the point of contact of the sphere with the surface

2006-10-11 07:21:44 · 1 answers · asked by Anonymous