Physics - February 2007

A ball is thrown vertically upward with a velocity of +10.0 m/s.
(a) How high does it rise?
___m
(b) How long does it take to reach its highest point?
___s
(c) How long does the ball take to hit the ground after it reaches its highest point?
___s
(d) What is its velocity when it returns to the level from which it started?
___m/s

2007-02-18 18:05:06 · 3 answers · asked by Anonymous

I am looking for a book about general relativity in which the topic is discussed more intuitively than math..although I know math. but I prefer to catch the idea first then go to details.....any suggestion? thanks

2007-02-18 17:51:30 · 2 answers · asked by expiton 1

2007-02-18 17:29:55 · 3 answers · asked by naga 1

2007-02-18 17:27:08 · 4 answers · asked by naga 1

2007-02-18 17:24:32 · 3 answers · asked by naga 1

A) physics first, chemistry second, biology third
B) physics first, biology second, chemistry third
C) chemistry first, physics second, biology third
D) chemistry first, biology second, physics third
E) biology first, chemistry second, physics third
F) biology first, physics second, chemistry third

2007-02-18 16:51:22 · 7 answers · asked by World Expert 1

2007-02-18 16:36:29 · 6 answers · asked by Anonymous

When you stick, let's say, a worm in the microwave, why does it blow up?

2007-02-18 16:32:15 · 6 answers · asked by Malice 1

Why do some objects have certern colours while others don't.

2007-02-18 16:11:34 · 7 answers · asked by Unazaki 4

Does a human body have gravity? Any sources will be appreciated.

2007-02-18 16:08:13 · 5 answers · asked by Anonymous

2007-02-18 15:38:15 · 8 answers · asked by Anonymous

You are traveling toward a mountain at 75 km/hr. You stop and look up to the top of a mountain. The angle of elevation from the ground to the top of the mountain is 0.026 radians. Twenty minutes later, the angle of elevation is 0.031 radians. About how tall is the mountain? Show all work! A picture may help.

2007-02-18 15:35:49 · 6 answers · asked by Anonymous

2007-02-18 15:29:50 · 5 answers · asked by narayanamurthy m 1

For the past month or so I have been getting Static Electric Shocks noticeably more often than usual. Everything I touch, whether it be a car, a metal desk, a light switch. Has anyone else been getting static electric shocks more often lately? Is there a way to prevent build up of static electricity? is there some kind of explanation for this? Any comments would really be appreciated.

2007-02-18 15:20:54 · 6 answers · asked by DJ 1

2007-02-18 15:19:51 · 11 answers · asked by jeffy 1

Gravitation is a phenomenon through which all objects attract each other. Issac Newton, myself and most of the scientific community agree that this is why things fall from the sky. If you have another theory that you think is better, please post it with your facts and observations. I am wondering what people are learning in science class.

http://en.wikipedia.org/wiki/Gravity

2007-02-18 15:05:00 · 3 answers · asked by Specialist McKay 4

2007-02-18 15:04:28 · 1 answers · asked by falcon10 1

How can i construct an automatic temperture controller that keeps the temp. of liquid constant btw 50celsius to 80.celsius. This is project i need to submit in two weeks.pls explain in details.

2007-02-18 14:31:56 · 4 answers · asked by thonjela 1

The spring of a spring gun has force constant k = 400 N/m and negligible mass. The spring is compressed 6.00 cm and a ball with mass 0.0300 kg is placed in the horizontal barrel against the compressed spring. The spring is then released, and the ball is propelled out the barrel of the gun. The barrel is 6.00 cm long, so the ball leaves the barrel at the same point that it loses contact with the spring. The gun is held so the barrel is horizontal.

Calculate the speed with which the ball leaves the barrel if you can ignore friction.

Calculate the speed of the ball as it leaves the barrel if a constant resisting force of 6.00 N acts on the ball as it moves along the barrel.

For the situation in part (b), at what position along the barrel does the ball have the greatest speed? (In this case, the maximum speed does not occur at the end of the barrel.)

What is that greatest speed?

2007-02-18 14:29:57 · 1 answers · asked by dimachevelle 2

I believe I already know the resistance of the battery : 0.104 ohms, but the second part of the question asks" What is resistance of the starter?" I just needed help w/ the second part if possible...

2007-02-18 14:23:22 · 2 answers · asked by Jade m 1

are separated in time by the interval Dt, is which of the following quantities?

2007-02-18 14:15:38 · 2 answers · asked by sakinah_123 1

Ok i got the first part of this question but i can't figure out the second part...help!

In raising a 4600 N piano with a pulley system, the workers note that for every 2 m of rope pulled down, the piano rises 0.2 m. Ideally, how much force is required to lift the piano?
460 N(got that)

now...
(b) If the workers actually pull with 2500 N of force to lift the piano, what is the efficiency of the pulley system?

2007-02-18 14:08:32 · 2 answers · asked by Jane A 3

i am questioning the photograph
http://www.boingboing.net/200605161107.jpg

and what happens when it hits the ground

2007-02-18 14:06:27 · 1 answers · asked by macgyver 1

2007-02-18 14:02:27 · 5 answers · asked by J K 1

My Wife believes that my 5 yr old son has some sort of psychic abilities - to be able to hear things and see things that are not there, due to some of the things my son has said and done around our house.

I too have heard some of the things my son has said, but am not sure - because I do not trully believe in all this psyhic stuff, and want to find out more as in is this is real or just him being a child with an over active imagination?

My wife would like to get him tested to see if he does have this gift - and I would also, just to see if this is real or not.

Does anyone know of a Psychic that works with Children, someone who can either tell my wife yes he has a gift - and explain to me just what this gift is?

I heard of places that work with children - but am unsure who they are and how to contact them?

2007-02-18 13:06:32 · 6 answers · asked by Answer Man? 2

The earth has been warmed by the radiation from the sun for millions of years, yet its average temperature has remained steady. Why?

2007-02-18 12:53:30 · 6 answers · asked by Anonymous

On a force diagram, why do kinetic friction and static friction point different ways?

Say you have a book sliding down an incline to the right. If it is not moving yet, then static friction is up the incline to the left.

Why, if it IS moving, is kinetic friction down the incline, to the right?

2007-02-18 12:48:25 · 4 answers · asked by servinit2me 2

Does light from a distant start travel at exactly the same speed all the way from the source to a telescope at sea level on Earth?? Keep in mind that the atmosphere is densest closest to Earth's surface

2007-02-18 12:45:11 · 4 answers · asked by Anonymous

1- In raising a 4600 N piano with a pulley system, the workers note that for every 2 m of rope pulled down, the piano rises 0.2 m. Ideally, how much force is required to lift the piano?

2-Suppose an automobile has 1300 J of kinetic energy. When it moves at twice the speed, what will be its kinetic energy?

2007-02-18 12:41:07 · 3 answers · asked by Jane A 3

A plumb bob does not hang exactly along a line directed to the center of the Earth's rotation. How much does the plumb bob deviate from a radial line at 32.5° north latitude? Assume that the Earth is spherical.

answer is wanted in degrees


HAVE THIS MUCH SO FAR from someone who answered.

The acceleration from the earth's rotation at 32.5° lat is
a = Re*cos32.5°*ω² = 2.84E-5 m/s²
Combining that with g at Lat 32.5 gives a deviation of roughly 8.93E-5°. The deviation will be toward the equator.

Draw a diagram with 9.8 m/s² acting toward the center and the value of a above acting outward perpendicular to the axis of the earth. This will give you a triangle with 2 sides and one angle known.

The tilt of the earth's axis doesn't enter into the answer.....

still do not understand how the deviation he listed will help me in figuring out the last side of the triangle.

2007-02-18 12:38:59 · 3 answers · asked by sabresfan58 1