Physics - February 2007

F=gmm(r^-2)
F=ma
-substitution-
a=Gm(r^-2)
The problem is as the to objects get closer, this equation says there acceleration increase, thus making the time quicker then assumed constant acceleration. I have worked on the problem for weeks and come up dry with summantions after summantions. Need some serious help.

2007-02-12 10:59:22 · 1 answers · asked by mr_fusion001 1

A sled is pulled at a constant velocity. The coefficient of static friction is μs=0.230. The coefficient of kinetic friction is μk=0.170. The sled is pulled at an angle θ=31.0° above the horizontal, and the combined mass of the sled and rider is M=58.0 kg. What is the force T?

So, here's what I have:
N = mgcosΘ
fk = uk*mg*cos Θ

Are those equations correct? Thanks for any help.

2007-02-12 10:55:25 · 2 answers · asked by Defcon6 2

I'm doing a project and I need to know.

2007-02-12 10:52:32 · 1 answers · asked by doris j 3

have heard both theories

2007-02-12 10:35:02 · 5 answers · asked by luminous 7

2007-02-12 10:33:46 · 7 answers · asked by Buck BUCK 2

In clude all info you can get. Please I'm despreate

2007-02-12 10:11:03 · 2 answers · asked by ~~H~X~D~~ 1

I'm in physical science b and we're learning about all this work, force, etc. stuff and i have to do an egg drop. i did that part already, but now i have to explain why air pockets help cushion the egg from recieving the full-on force from hitting the ground...

2007-02-12 10:05:47 · 5 answers · asked by larkaloo 2

juan and kathleen bought model rocket kits. they built identical rockets with identical engines. juan however glued small pieces of a broken bicycle reflector to his rocket to make it more visible in the sky.

Part a: if everything is the same on both rockets except for the reflector pieces which rocket will travel higher when they are launched at the exact time.

part b: explain why the rocket selected in part a would travel higher

2007-02-12 10:03:39 · 7 answers · asked by Anonymous

2007-02-12 10:01:12 · 4 answers · asked by Anonymous

2007-02-12 10:01:01 · 1 answers · asked by Lucky7_7_7 1

Have there ever been any cases of people being able to see radiation out side the visible wave length!

Celluar phones emit microwave radiation yes? I belive that I have seen a desturbance in teh light around the edges of a cell phone, agaist a bright white background.

Is this possible?

2007-02-12 09:19:58 · 7 answers · asked by BobbyLZ 2

To make iced tea, you start by brewing the tea with hot water. Then you add ice. If you start with 1.0 L of 90.0º Celsius tea, what is the minimum amount of ice needed to cool it to 0º Celsius? Would it be better to let the tea cool to room temperature before adding the ice?

I don't understand this.
Please help me.

2007-02-12 09:12:19 · 1 answers · asked by swimmertommy 1

2007-02-12 09:02:47 · 1 answers · asked by azngirl62506 1

2007-02-12 08:56:37 · 3 answers · asked by Anonymous

College question

2007-02-12 08:33:05 · 4 answers · asked by nuyorricankid 1

when you compress a spring and then compress it again by the same amount, is there a difference in the amount of energy and if so is it doubled? quadrupled?

2007-02-12 08:07:57 · 3 answers · asked by Amy S 2

There is a current in a 1.39- A through a toaster connected to a 120.0-V circuit. What is the resistance of the toaster?____amps

2007-02-12 07:52:17 · 1 answers · asked by Hey ;) 3

2007-02-12 07:41:15 · 13 answers · asked by mukesh a 1

All knows what is optical illusions, but who knows how its works!?

2007-02-12 07:29:30 · 3 answers · asked by Anonymous

The magnetic field of Earth has had (3,5,7) intervals of reversed polarity during the past 4 million years.

Choose your answer from the three options in the parenthesis.

2007-02-12 07:25:27 · 2 answers · asked by Contradicted_by_All 1

2007-02-12 07:18:42 · 9 answers · asked by biff 1

2007-02-12 06:57:12 · 8 answers · asked by Anonymous

A block is given an initial speed of 3.0 m/s up the 22 degree plane. How far up the plane will it go? How much time elapses befoer it returns to starting point. Asumme Uk is 0.17

2007-02-12 06:42:03 · 1 answers · asked by chen_er_fong 1

2007-02-12 06:12:41 · 2 answers · asked by alste 2

2007-02-12 06:12:15 · 10 answers · asked by mani k 1

2007-02-12 06:08:51 · 4 answers · asked by alste 2

A boat is traveling upstream at 14 mph with respect to a river that is flowing at 6 mph (with respect to the ground). A man runs directly across the boat, from one side to the other, at 6 mph (with respect to the boat). The speed of the man with respect to the ground is:


a. 10 mph

b. 14 mph

c. 18.5 mph

d. 21 mph

e. 26 mph

2007-02-12 06:07:49 · 3 answers · asked by el tuani 1

Two objects are traveling around different circular orbits with constant speed. They both have the same acceleration but object A is traveling twice as fast as object B. The orbit radius for object A is _______ the orbit radius for object B.


a. one-fourth

b. one-half

c. the same as

d. twice

e. four times

2007-02-12 06:06:43 · 3 answers · asked by el tuani 1

Cathodes work using "reduction," right? By what mode of action is it able to take things? For example, in a battery, the anode is giving up a pair of electrons to sulfuric acid, and I suppose the cathode is doing the opposite by taking the electrons?

2007-02-12 06:03:55 · 1 answers · asked by Anonymous

2007-02-12 06:02:29 · 3 answers · asked by Anonymous