Physics - February 2007

for example when a charged comb attract paper confetti, some confetti remains attracted to the comb. while others are initially attracted but are then repelled upon contact

2007-02-13 22:09:11 · 2 answers · asked by Anonymous

A golf ball is launched from the ground with a velocity of 30 m/s at an angle of 45 degrees with respect to horizontal.

a) what is the balls max height?
b) what is the velocity at the maximum height?

2007-02-13 22:02:33 · 2 answers · asked by xbootylicious86x 1

Could you look back to see yourself taking off.

2007-02-13 21:10:37 · 10 answers · asked by pozitive thinking 2

a particle is projected at angle x with horizontal whose inclination to horizontalis y show that it will strike the plane at right angle if cotY =2 tan(x-y)

2007-02-13 21:08:23 · 1 answers · asked by Anonymous

we know solid,liquid and gas states.But what is plasma.

2007-02-13 21:07:47 · 4 answers · asked by salem 1

2007-02-13 20:00:21 · 3 answers · asked by Anonymous

Force of a Baseball Swing. A baseball has mass 0.145 kg.

(a) If the velocity of a pitched ball has a magnitude of 45.0 m/s and the batted ball's velocity is 55.0 m/s in the opposite direction, find the magnitude of the change in momentum of the ball.

(b) Find the magnitude of the impulse applied to it by the bat.

(c) If the ball remains in contact with the bat for 2.00 ms, find the magnitude of the average force applied by the bat.

2007-02-13 19:46:03 · 4 answers · asked by M 1

2007-02-13 19:42:07 · 2 answers · asked by Anonymous

A skier of mass 60.0 kg starts from rest at the top of a ski slope of height 63.0 m.

(a) If frictional forces do −1.04×10^4 J of work on her as she descends, how fast is she going at the bottom of the slope?
Take free fall acceleration to be g= 9.80 m/s^2 .

(b) Now moving horizontally, the skier crosses a patch of soft snow, where the coefficient of friction is Mu_k= 0.150 . If the patch is of width 60.0 m and the average force of air resistance on the skier is 170N , how fast is she going after crossing the patch?

(c) After crossing the patch of soft snow, the skier hits a snowdrift and penetrates a distance 2.50 into it before coming to a stop. What is the average force exerted on her by the snowdrift as it stops her?

2007-02-13 19:38:34 · 1 answers · asked by M 1

Tarzan, in one tree, sights Jane in another tree. He grabs the end of a vine with length 20 m that makes an angle of 45 with the vertical, steps off his tree limb, and swings down and then up to Jane's open arms. When he arrives, his vine makes an angle of 30 with the vertical.

Calculate Tarzan's speed just before he reaches Jane. You can ignore air resistance and the mass of the vine.

2007-02-13 19:35:41 · 1 answers · asked by M 1

a 90kg car is speeding at 97km/h on a level road.determine the horizontal breaking force applied to stop it in 67m.

2007-02-13 19:18:48 · 3 answers · asked by april joy n 1

2007-02-13 19:15:00 · 1 answers · asked by navid 2

2007-02-13 19:13:50 · 6 answers · asked by delhiet 1

A 10kg object is rest a point A. The object accelerates uniformly from point A to point B in 4 seconds, attaining a maximum speed of 10 meters per second at point B.

What distance did the object travel in moving from point A to point B?

(1) 2.5 m
(2) 10m
(3) 20m
(4) 100m

Please use the common formulas and explain it!

2007-02-13 19:05:12 · 4 answers · asked by Kala J 3

Can an atom be made or programmed to work according to our purpose or wishes?

2007-02-13 19:00:05 · 6 answers · asked by rajesh bhowmick 2

How does refraction cause the emission spectrum through a prism?
Is it right to say that: the different light wavelengths bend different amounts in the prism, which we see as different colours?

2007-02-13 18:39:44 · 3 answers · asked by Anonymous

2007-02-13 17:57:02 · 7 answers · asked by Bobby 1

If a 5 N force were applied to the person on a car, but no movement resulted, how would you explain this phenomenon?

2007-02-13 17:55:06 · 4 answers · asked by Johnnyboy 2

How do you know? What difference does it make?

2007-02-13 17:35:21 · 7 answers · asked by Anonymous

2007-02-13 16:11:56 · 14 answers · asked by Odin 1

We are studying equal potential lines in my high school physics class, and I have this question.

If lightning strikes a tree 20 meters away, would it be better to stand facing the tree, your back to the tree, or your side to the tree? Assume that your feet are a comfortable shoulder width apart.

I really don't get equal potential lines, is there any generalization you can say about them? Any help or websites about equal potential lines would be much appreciated.

2007-02-13 15:46:49 · 4 answers · asked by Ace 5

In respect to field lines and potential.

2007-02-13 15:11:19 · 1 answers · asked by Sir Guitarist 2

2007-02-13 14:59:26 · 3 answers · asked by adrian2chavez@sbcglobal.net 1

2007-02-13 14:36:51 · 5 answers · asked by chocolateT 2

An example would help also, maybe use it in a sentence so I could understand it better pls?

2007-02-13 14:26:20 · 7 answers · asked by Anonymous

suggest any links

2007-02-13 14:21:23 · 3 answers · asked by ktfree123 1

Okay there are two questions that I do not understand about vibrations and waves. Here they are:

4. Suppose that a pendulum has a period of 1.5 seconds. How long does it take to make a complete back-and-forth vibration? Is this 1.5-second period pendulum longer or shorter in length than a 1-second period pendulum?

8. Does the medium in which a wave travels move along the wave itself ? Defend your answer.


Please give a thorugh, yet simply understandable answer. Best one will be rewarded 10 points.

2007-02-13 14:20:56 · 4 answers · asked by Alexis's Love Potion #9 4

Suppose that sunlight falls both on pair of reading glasses and on a pair of dark sunglasses. Which pair would be warmer? Why

2007-02-13 14:06:49 · 3 answers · asked by Melissa 2

Can you please help me with this.~ List three ways that each of the five main forms of energy (mechanical, heat, chemical, electromagnetic, nuclear) impact your life daily.

2007-02-13 14:03:54 · 2 answers · asked by Mandy 1

What happens to the magnetic field and force of an electromagnet if no current is passing through the solenoid/wire? Will the iron core itself still produce a magnetic force? My resources tell me that the charged solenoid causes the domains in the iron core to line up (which makes it magnetic). Does that mean that if the solenoid is no longer charged, the iron core isn't as well? Help me out here, and I will appreciate it.

2007-02-13 13:52:16 · 4 answers · asked by Stupid Flanders 4