Physics - February 2007

I need to understand how to categorize waves and i heard about longitudinal and transverse waves. I dont understand what it is? can you explain it? Ive seen the wikipedia article on it so i dont want you to just copy paste it cause i dont understand what the wikipedia was saying i don tget it, help1

2007-02-15 13:30:54 · 2 answers · asked by Anonymous

explain.

2007-02-15 12:41:06 · 4 answers · asked by argentina 1

Superman must stop a 100 km/h train in 150 m to keep it from hitting a stalled car on the tracks. If the train's mass is 360,000 kg, how much force must he exert? Compare to the weight of the train.

I was thinking that i would find the acceleration with the Kinematics equation...

V^2 = Vo^2 + 2a(x-xo)

The acceleration i came up with was -33.3333333 km/hr.

I then took Newtons formula to calculate the force.

F = ma

F = (360,000 kg) x (-33.3333333 km/hr)

F = -12,000,000 N

I do not understand what i am doing wrong... the answer should be -930,000 N which is %25 the weight of the train.

Thanks.

2007-02-15 12:39:31 · 3 answers · asked by mono 1

why do you airplanes bank when they turn? how would you compute the banking angle given its speed and radius of the turn?

2007-02-15 12:35:56 · 4 answers · asked by argentina 1

Hey guys! I need help with this physics problem. Hope you guys can help me!!! Thanks a lot. =)

A 9.5 kg fullback, running at 8.2m/s, collides in midair with a 128 kg defensive tackle moving in the opposite direction. Both players end up with zero speed.
a. What was the fullback's momentum before the collision?
b. What was the change in the fullback's momentum?
c. What was the change in ther tackle's momentum?
d. What was the tackle's original momentum?
e. How fast was the tackle moving originally?

Hope you guys can explain it to me once you get the answers. Thanks. I really need your help. =)

2007-02-15 12:28:42 · 3 answers · asked by Anonymous

2007-02-15 11:57:37 · 2 answers · asked by Kevin G 2

it apparently sinks in light cooking oil...but what other liquids will it sink in....

2007-02-15 11:55:16 · 5 answers · asked by kitten 3

the position of an object before time=0?

2007-02-15 11:43:48 · 3 answers · asked by bekki s 1

2007-02-15 11:34:50 · 14 answers · asked by Stef 4

isn't it possible to calculate a negative time value if you are not given time is greater than or equal to zero?

2007-02-15 11:33:48 · 2 answers · asked by bekki s 1

I have no idea how to approach the following problem. Any help is appreciated. I know the equations for elastic collisions already, but I don't know how to apply them to this problem.

A small ball of mass m is aligned above a larger ball of mass M = 0.71 kg (with a slight separation, as with the baseball and basketball of Figure 9-67a(see link below)), and the two are dropped simultaneously from height h = 1.5 m. (Assume the radius of each ball is negligible relative to h.)

http://www.webassign.net/hrw/hrw7_9-67.gif

(a) If the larger ball rebounds elastically from the floor and then the small ball rebounds elastically from the larger ball, what value of m results in the larger ball stopping when it collides with the small ball?

(b) What height does the small ball then reach (Figure 9-67b)?

2007-02-15 10:45:50 · 2 answers · asked by soccerman1990 2

...anything at all?

This is a physics question by the way.

2007-02-15 10:27:01 · 9 answers · asked by Zeek 3

I know that it has something to do with lower humidity, but I forget the scientific reason, regarding electrons etc. I learned it in school but that was 10y ago. Someone asked me and I realized that I forgot.

2007-02-15 10:25:26 · 7 answers · asked by >>-rsb--> 2

I Must Know This Quickly Pls!

2007-02-15 10:25:24 · 4 answers · asked by foxx9111 1

Plz.solve this problem showing method & full calculation.Also plz.suggest website so that i can get help from the website for solving different problems related to maths for class vith.

2007-02-15 10:08:31 · 11 answers · asked by ANJU R 1

A roller coaster is built with four "humps." The humpr from which the coaster is launced is 40 m tall, the second is 30 m, the third is 20 m and the fourth is 10 m. Assuming the coaster is launced with negligible initial speed, what is the speed at the top of each hump? What is the speed at the exit at a height of zero?

2007-02-15 10:06:48 · 1 answers · asked by Kimmy D 1

2007-02-15 10:02:33 · 4 answers · asked by MATT 1

okay so if the earth has enough gravity to hold oceans to the earth how can we walk?

2007-02-15 09:56:29 · 3 answers · asked by Anonymous

2007-02-15 09:45:35 · 1 answers · asked by kaitepie011 1

If you put a balloon that has copper wire attached to it into an electrical circuit and close the switch, what makes the balloon pop when the switch was pushed? Explain?

2007-02-15 09:07:19 · 2 answers · asked by untilyoucamealong04 3

Could it be possible to use the energy created by an earthquake in order to obtain some other kind of energy?...maybe an energy that could be used proportionaly to save buildings someway somehow? I understand the amount of energy spreaded for an eareathquake is inmense and ranmdly spread it but..we already use powerful amounts of water or wind guts to generate electricity.

2007-02-15 08:49:54 · 1 answers · asked by bajacabo 2

In daily life, what are some objects that contain fuses?

2007-02-15 08:25:05 · 13 answers · asked by untilyoucamealong04 3

Mr Sighanis reached this height in a baloon couple of years ago

2007-02-15 08:20:48 · 4 answers · asked by harirambhia 1

Answer this question: Does a tree falling over in a forest make a noise if there is no receptor (human or animal ear) to hear it?
In your answer, describe why you think it does or does not. How could I test this? :) -ry

2007-02-15 08:18:18 · 22 answers · asked by the_pink_dahlia 1

If the energy can't be destroyed only transformed in some other type of energy...where the energy contained in a human body (not the human remains) goes or in wich kind of energy is transformed when we died?

2007-02-15 08:04:36 · 3 answers · asked by bajacabo 2

2007-02-15 07:53:49 · 3 answers · asked by pattycake9000 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.

A) Calculate the speed with which the ball leaves the barrel if you can ignore friction.
B) 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.
C)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.)
D) What is that greatest speed?

Thank You

2007-02-15 07:47:20 · 2 answers · asked by matty 2

2007-02-15 07:31:42 · 7 answers · asked by pattycake9000 1

After the study on why toast always falls butter side down, we now have the formula for the "beer goggles" effect.

The formula goes like this:


β = (An)^2 x d(S + 1)

--------------------------------------------------------------------------------
√L x (Vo)^2


where:
An is the number of servings of alcohol
S is the smokiness of the area on a scale of 0 - 10
L is the lighting level of the area, measured in candelas per square meter, in which 150 is normal room lightning
Vo is Snellen visual acuity, in which 6/6 is normal and 6/12 is the lower limit at which someone is able to drive
d is the distance between the observer and the observed, measured in meters

Who in the world is funding these people, and where do I go for a job application?

2007-02-15 07:08:56 · 6 answers · asked by Anonymous

I wanna know how does the temperature affect the resistance of the wire.

2007-02-15 06:57:37 · 4 answers · asked by fatzah 1