Physics - October 2006

(smooth & vertical). A person who weighs 356 N stands 3.1 m up the ladder. The foot of the ladder rests on the floor 8.47 m from the wall.

Calculate the force exerted by the wall (in N)?

Calculate the normal force exerted by the floor on the ladder (in N)?

2006-10-31 07:27:45 · 1 answers · asked by Dee 4

A horizontal force of 840 N is needed to drag a crate across a horizontal floor with a constant speed. You drag the crate using a rope held at an angle of 28°.

What force do you exert on the rope?

How much work do you do on the crate when moving it 22 m?

If you complete the job in 8 s, what power is developed (in kW)?

How would you solve these problems? With what formulas?

2006-10-31 07:16:13 · 4 answers · asked by Isabel G 1

2006-10-31 07:13:24 · 7 answers · asked by goring 6

2006-10-31 07:11:07 · 1 answers · asked by goring 6

On his 30th birthday, a man who wishes to build a time machine is visited by a future version of himself. This future self explains to him that he should not worry about designing the time machine, as he has done it in the future. The man receives the schematics from his future self and starts building the time machine. Time passes until he finally completes the time machine. He then uses it to travel back in time to his 30th birthday, where he gives the schematics to his past self, closing the loop.

My real question is what happens if he never tells his old self ?

also- A professor travels forward in time, and reads in a physics journal about a new equation that was recently derived. He travels back to his own time, and relates it to one of his students who writes it up, and the article is published in the same journal which the professor reads in the future.

What happens if he keeps it to himself?

2006-10-31 07:09:31 · 6 answers · asked by cory c 1

2006-10-31 07:08:00 · 6 answers · asked by maddogs 1

2006-10-31 07:03:06 · 5 answers · asked by goring 6

2006-10-31 07:00:47 · 3 answers · asked by goring 6

In traveling to the Moon, astronauts aboard the Apollo spacecraft put themselves into a slow rotation to distribute the sun's energy evenly. At the start of their trip they accelerated from no rotation to 1revolution every minute during a 12 min time interval. THe spacecrafy can be thought of as a cylindar with a diameter of 8.5m. Determin the angular acceleration and the radial and tengential components of the linear acceleration of a point on the skin of the ship 5 min after it started this acceleration.

2006-10-31 06:55:49 · 5 answers · asked by Anonymous

Calculate the angular velocity of the Earth in its orbit around the Sun and about its axis.

2006-10-31 06:53:23 · 5 answers · asked by Anonymous

Mammals that depend on being able to run fast have slender lower legs with flesh and muscle concentrated high, close to the body. On the basis of rotational dynamics, explain why this distribution of mass is advantageous.

2006-10-31 06:51:24 · 4 answers · asked by Anonymous

torque produced by a 4.0 N force applied to a door at a perpendicular distance of 0.46 m from the hinge (in units of N . m)

2006-10-31 06:42:14 · 4 answers · asked by Dee 4

20 0ver 10, divided into 20 0ver ten?

2006-10-31 06:41:35 · 4 answers · asked by BOT22 1

2006-10-31 06:33:18 · 6 answers · asked by hany s 2

2006-10-31 06:24:06 · 6 answers · asked by goring 6

2006-10-31 06:21:06 · 5 answers · asked by goring 6

(A) The distance between repeating points of a wave pattern?
(B) The distance between peak and trough?
(C) The distance between points of the wave crossing the line of zero disturbance?
(D) The physical length of a sine wave if measured in a straight line?

2006-10-31 06:17:32 · 7 answers · asked by Anonymous

2006-10-31 06:01:04 · 1 answers · asked by goring 6

2006-10-31 05:56:46 · 1 answers · asked by goring 6

2006-10-31 05:54:07 · 1 answers · asked by goring 6

2006-10-31 05:48:29 · 3 answers · asked by goring 6

2006-10-31 05:38:52 · 4 answers · asked by Boben 1

Thes stars would be burned out so what we see no longer exist?

















































so what we observe is an imaginary Universe which has already burned out?

2006-10-31 05:31:17 · 7 answers · asked by goring 6

2006-10-31 05:30:57 · 2 answers · asked by nizzlator 1

What is a good definition of "discharged"?

2006-10-31 05:28:39 · 1 answers · asked by mbchelsea 1

2006-10-31 05:25:21 · 4 answers · asked by melanie m 1

especially related to electrical for class-XII

2006-10-31 05:01:29 · 3 answers · asked by angel 2

Am studying spectroscopy but am not getting the concepts..

2006-10-31 04:52:51 · 2 answers · asked by Sreek n 1

An ray of light is incident on a block of transparent material with an angle of incidence of 42. The angle of refraction is 25 degrees. Use Snell's Law and remember that the index of refraction of air may be taken to be 1.00. (What equation do you use too?)(If it's possible, can you list the steps you took to get the answer?)THANKS!

2006-10-31 04:47:11 · 3 answers · asked by Anonymous

I have an assignment to hand in later this week!!!

Could somebody please explain "The construction of a simple parallel plate capacitor"

And briefly explain how a variable capacitor works?

2006-10-31 04:43:14 · 2 answers · asked by Anonymous