Physics - October 2007

What can someone construct, to measure gravity at home?

2007-10-04 19:07:33 · 8 answers · asked by Kar Kar 1

The image in the mirror is inverted left to right and right to left as an optical phinomina but not head is shown in the botton and feet are shown in the top.

2007-10-04 19:01:05 · 6 answers · asked by dswaroop1 1

2007-10-04 17:37:38 · 2 answers · asked by afiezx 1

if gravity is the bending of space through time(simply put) then if time stops, does gravity cease to exist?

2007-10-04 17:16:06 · 10 answers · asked by Some guy on the street 1

this is the joke but i only get the separate vocabulary but not the funny part. explain because im not much of a big words person lol


Your mother is so dumb that she designed experiments exploiting quantum mechanics in an effort to determine the nonlocality inherant in the microcosmos and undermine the true nature of the uncertainty principle!

2007-10-04 16:56:38 · 3 answers · asked by Allen 2

Einselection seems to explain the outcomes of distinct states and the onset of classical reality. Unfortunately, there are other anomalies to take into consideration. What quantum theory best explains these anomalies? I think the Consciousness Causes Collapse Theory is incredibly interesting but highly unlikely. What are your thoughts on this theory, and do you think it displays a valid answer to the random outcomes or anomalies?

2007-10-04 16:47:56 · 1 answers · asked by Anonymous

You are designing a pendulum designed to wreck buildings called a "wrecking ball". When the ball is displaced from its equilibrium position by 30 degrees on a 20 meter line, you would like it to have energy equal to 35,000 Joules when it returns to its equilibrium position. What mass must the wrecking ball have to accomplish this?

2007-10-04 16:42:05 · 1 answers · asked by Abdul S 3

A simple atwood's machine uses 2 masses m1 and m2. Starting from rest, the speed of the two masses is 5.2m/s at the end of 6.7s. At that time, the kinetic energy of the system is 77J and each mass has moved a distance of 17.42 m.

The acceleration of gravity is 9.8m/s2.

a.)Find the value of the heavier mass
b.)Find the value of the lighter mass

2007-10-04 16:37:05 · 1 answers · asked by mathgeek 1

Rank the arrangements in the picture according to the magnitude of the electric field at the center of the curvature, largest first.

http://img62.imageshack.us/img62/7821/92127235fc2.png

The instructor says that all of them have the same electric potential because they all have the same distance R and the same charge Q. But then, for electric field, the magnitude would be similar, just with an R^2 on bottom instead of just R. That would mean that all four are the same for electric field as well, right?.

But it looks to me that if the charge was evenly distributed the electric field on 4 should be 0, since it is pushing evenly on P from all directions and everything would cancel. Is this because E is a vector and therefore depends on direction as well as magnitude, while V only depends on magnitude? Or am I just not thinking straight and am totally off?

So how do you rank them?

2007-10-04 15:26:05 · 5 answers · asked by nemahknatut88 2

When a car accelerates forward, it tends to rotate about its center of mass. The car will nose forward:

a) when the driving force is imposed by the rear wheels (for front-wheel drive the car would nose downward).

b) whether the driving force is imposed by the rear or the front wheels.

2007-10-04 14:59:22 · 2 answers · asked by ? 6

A satellite of mass 4900 kg orbits the Earth (mass = 6.0 1024 kg) and has a period of 6200 s

(a) Find the magnitude of the Earth's gravitational force on the satellite.
=......N
(b) Find the altitude of the satellite.
=.......m

2007-10-04 14:24:05 · 2 answers · asked by Nikita 1

(a) If it takes 0.6 seconds for it to reach the floor, what is the vertical component of the ball's velocity just before it hits the floor? (Use g = 10 m/s2.)

(b) What is the horizontal component of the ball's velocity just before it hits the floor?

2007-10-04 14:04:30 · 5 answers · asked by yea! 1

I don't understand why im not geting these right! Isn't it just F= ma???

Here is the question: The figure shows an acceleration-versus-force graph for three objects pulled by rubber bands. The mass of object 2 is 0.300 kg. What are the masses of objects 1 and 3?

Here is the figure: http://session.masteringphysics.com/problemAsset/1000350/6/knight_Figure_04_05.jpg

2007-10-04 13:59:01 · 2 answers · asked by katie m 1

a 80 kg stuntman falls of a 20m platform ,falls for 18m and lands on a 2m deep foam mat what is the minimum upward force the mat must exert to keep him from hitting the ground

2007-10-04 13:58:54 · 1 answers · asked by king of soccer 1

2007-10-04 13:55:45 · 5 answers · asked by Anonymous

2007-10-04 13:50:17 · 6 answers · asked by Pascal 4

can you answer this question Can a vector have a component greater than its magnitude?

2007-10-04 13:29:57 · 3 answers · asked by jack s 2

5 pulleys, 2 fixed and 3 movable, are connected by a single cord. What load can an effort of 100N move with this machine. I hope the solution would be in detail for me to analyze.
Next, we hadn't made the experiment but I hope you would directly tell me the answer. Which machine would be likely to have the greatest efficiency?why?
Last, How does the actual mech'l advantage of a simple machine change with the load?
Thank you to the person who answers this. And God Bless you.

2007-10-04 12:40:23 · 1 answers · asked by Ross 1

A woman at an airport is towing her 15.0 kg suitcase at constant speed by pulling on the strap at an angle above the horizontal (Fig. P4.40). She pulls on the strap with a 24.0 N force, and the friction force on the suitcase is 10.0 N.

(a) What angle does the strap make with the horizontal?
65.37 degrees
(b) What normal force does the ground exert on the suitcase?
___?____

I already found the angle but how do I solve the 2nd part?? Thank you!

http://books.google.com/books?id=wDKD4IggBJ4C&pg=PA112&lpg=PA112&dq=fig+%22p4+40%22+college+physics&source=web&ots=fnlu-8GTUY&sig=mKHKkKuaFVoOM2kBNN8XHj_VY0k

This link has fig P4.40 on it.

2007-10-04 12:37:57 · 1 answers · asked by redblitz528 1

1. a car accelerates constantly. it started at 10 m with a velocity of 15 m/s and ended at 40 m with velocity of 60 m/s, what was the acceleration?
2. a person falls out of a hot air balloon. eyewitnesses reported that it took the person 5 secs. to hit the ground. what was the person's velocity just before they hit the ground?
3. a car with an intitial velocity of 30 m/s slammed on the brakes and skidded to a stop. if the skid marks created by the tires were 15 m long, and the car experienced constant acceleration, what was the car's acceleration while the brakes were applied.
4. if the driver of a car applied the brakes so that the car had an acceleration of -3m/s^2, and the car started out with a velocity of 50 m/s, what was the distance required for the car to come to a stop?

use one of the following equations:
1. V=Vo+at 2. X=Xo+Vo t+1/2at^2
3. v^2=Vo^2+2a(X-Xo)

thank you if you do help......

2007-10-04 12:36:48 · 1 answers · asked by anynomous 1

2007-10-04 12:35:46 · 14 answers · asked by Anonymous

The helicopter in the drawing is moving horizontally to the right at a constant velocity. The weight of the helicopter is W = 54600 N. The lift force generated by the rotating blade makes an angle of 21.0° with respect to the vertical.


(a) What is the magnitude of the lift force?


(b) Determine the magnitude of the air resistance that opposes the motion.

2007-10-04 12:33:04 · 1 answers · asked by J.Mo 1

2007-10-04 12:28:19 · 11 answers · asked by Anonymous

this is the second time im asking, i dont think i made the last one clear enough. so there's 2 circuits, parallel and series each with 4 bulbs (the 2 batteries are not in parallel in the parallel circuit, in both circuits the batteries are side-by-side). in the series circuit, the bulbs are lines up. in the parallel, the bulbs are in parallel, each with their own path. if it is series, is it because when energy goes through the filament (the resistor in this case) it's converted into light and heat, but when it goes past the resistor, the energy is transferred back into it's original power? what if it doesnt? does the first bulb closest to the positive ( i think energy goes positive to negative terminal) terminal appear brighter than the rest? and the fourth bulb the dimmest? what about parallel. lets say the total voltage is 12V. does each bubl get 3V ea then? please explain.

2007-10-04 12:13:25 · 4 answers · asked by Anonymous

what is 26668.83777

to the one tenth of a millisecond???

2007-10-04 11:48:35 · 2 answers · asked by rickyricardoiscool 1

I want to take heat Solar, Candle, water, heat and light a lightbuld with it what would i need to make this happen?

2007-10-04 11:46:51 · 3 answers · asked by Anonymous

2007-10-04 11:35:29 · 4 answers · asked by THEM 2

THe Top of Mt. Everest is 29,028ft above sea level

2007-10-04 11:22:18 · 6 answers · asked by eugennwhite 1

-2x+5y-2z=-5

2007-10-04 11:20:38 · 2 answers · asked by garrett m 1

Determine the equivalent resistance between the points A and B for the group of resistors in the drawing. Use R1 = 3 , R2 = 13 , and R3 = 8 . Req = ?????

please SEE THE PIC!
THANK YOU SO MUCH, i really appreciate it....

http://i240.photobucket.com/albums/ff216/jy8686/physics7.jpg

2007-10-04 10:57:03 · 1 answers · asked by Anonymous