Physics - December 2007

A 2.26 kg book is dropped from a height of 1.5m.
a.What is it accelaraton?
b. What is its weight in newtons?
PLEASE SHOW STEPS FOR ME TO UNDERSTAND.THANK YOU.:)

2007-12-11 16:25:53 · 3 answers · asked by name 2

(a) What is its displacement in radians in this time?
(b) What is its average rotational velocity in rad/s?

2007-12-11 16:20:59 · 3 answers · asked by shamsan_415 1

A 21.0 g marble sliding to the right at 21.1 cm/s overtakes and collides elastically with a 8.8 g marble moving in the same direction at 13.9 cm/s. After the collision, the 8.8 g marble moves to the right at 16.4 cm/s. Find the velocity of the 21.0 g marble after the collision.

2007-12-11 16:13:08 · 2 answers · asked by Kecin S 1

A 2200 kg car traveling at 11.4 m/s collides with a 2680 kg car that is initially at rest at the stoplight. The cars stick together and move 2.60 m before friction causes them to stop. Determine the coefficient of kinetic friction betwen the cars and the road, assuming that the negative acceleration is constant and that all wheels on both cars lock at the time of impact.

2007-12-11 16:12:30 · 1 answers · asked by Kecin S 1

A 5.1 g coin sliding to the right at 26.4 cm/s makes an elastic head-on collison with a 15.5 g coin that is initially at rest. After the collision, the 5.1 g coin moves to the left at 10.2 cm/s.

(a) Find the final velocity of the other coin.

(b) Find the amount of kinetic energy transferred to the 15.5 g coin.

2007-12-11 16:11:40 · 1 answers · asked by Kecin S 1

for a given omega, show that the position (or the envelope of the position) goes to zero quickest for a critically damped harmonic oscillator.

2007-12-11 16:10:32 · 2 answers · asked by Johnny 1

2007-12-11 14:59:35 · 2 answers · asked by Anonymous

I'm sorry the title is so gruesome, but I have a question, I have heard in urban legends, people talking about news and things like that, that when a person puts a dog, cat, or baby ((O_O something I would never do!)) in a microwave, the subject explodes after a while, our friends were discussing this when we heard a man killed a baby by putting it 40 seconds in the microwave, and a dog exploded after 4 min.
I have heard about these stories, but never seen it happen, when my tea cup goes in the microwave with some stranded little ant, even though I put it 1:50 seconds, nothing happens to the ant, when I put a chicken in the microwave, lets say im cooking a whole chicken for 10:00 min. or more, it doesn't explode, so why would a cat, dog, or any other animal that fits in it explode?

2007-12-11 14:29:38 · 8 answers · asked by Anonymous

Two carts with masses of 4.84 kg and 2.34 kg move toward each other on a frictionless track with speed of 4.90 m/s and 3.12 m/s respectively. The carts stick together after colliding head - on. Find the final speed.

2007-12-11 14:22:32 · 5 answers · asked by Anonymous

I saw a magnet object earlier in a scientific magazine, the magazine stated it cost 100 dollars, it looks like a lamp but it comes with a rocket, a watch, or a pircute frame, you supposively just give it a little push and it starts spinning "FOREVER" anyone know what it is called?? Or how to search for it?
It looked pretty neat!

2007-12-11 14:07:21 · 1 answers · asked by Ramiro S 1

If 'explosive' do not explode if there are no atmospheric h20. Then it would be great for engineers and scientists to invent an instrument like this one. I do not know nothing about this subject. Just recommending it.

2007-12-11 14:01:21 · 4 answers · asked by Anonymous

The radius of Earth is about 6.40 x 10^3 km. A 3.90 x 10^3-N spacecraft travels away from Earth. What is the weight of the spacecraft at 6.40 x 10^3 km away from Earth? What about 1.28 x 10^4 km?

2007-12-11 13:50:03 · 2 answers · asked by soccerlover39 1

I am having difficulty with these problems, please show how to solve these. Thank you!

1) An 80kg man is one-fourth of the way up a 10m ladder that is resting against a smooth, frictionless wall. If the ladder has a mass of 20kg and it makes an angle of 60 degrees with the ground, find the force of friction of the ground on the foot of the ladder.

2) Refer to this picture...

http://img124.imageshack.us/my.php?image=physlp7.jpg

Two identical signs, each of mass M, are held aloft in adjacent archways. Following a large gust of wind, several ropes holding the signs snap, leaving only those shown in the picture. If each sign is in translational equilibrium, find the tensions of the remaining ropes in terms of its mass and gravity, g.
T1 has a 30 degree angle, T2 is 90, T3 is 45, T4 is 60.

2007-12-11 13:47:27 · 2 answers · asked by Anonymous

Have you ever study the concepts of solenoid and their uses? A solenoid is an instrument, which contains a coil of wire, acts as magnet when current passes through the coil. Then the final result is an automatic switch that is ususally used in automotive starting system.

I just want to know if black holes have the same concept. Are things always going through the black holes? Do black holes ever stop vacuuming or is it automatic like a solenoid? For example, A tunnel must have two doors in order for it to work, right? One at the entrance and one at the exit. If there is only one entrance, how can it vacuum thing into it? There are no fluidity if only a one entrance. This is applied into the h20 question--well kind of.

2007-12-11 13:41:44 · 1 answers · asked by Anonymous

In the figure below, block 1 of mass m1 slides from rest along a frictionless ramp from height h = 2.50 m and then collides with stationary block 2, which has mass m2 = 2.00m1. After the collision, block 2 slides into a region where the coefficient of kinetic friction k is 0.600 and comes to a stop in distance d within that region.

(a) What is the value of distance d if the collision is elastic?
(b) What is the value of distance d if the collision is completely inelastic?

http://i175.photobucket.com/albums/w138/kacortez/9-66.gif

2007-12-11 13:40:39 · 3 answers · asked by Anonymous

A gas expands from I to F along the three paths indicated in http://www.webassign.net/sercp/p12-5.gif

Calculate the work done on the gas along each path
(a) IAF
I know this one is -810.4

(b) IF
I dont know how to find this one!

(c) IBF
I know this one is -202.6

2007-12-11 13:39:03 · 1 answers · asked by Brittany F 2

In Figure 9-22, projectile particle 1 is an alpha particle and target particle 2 is an oxygen nucleus. The alpha particle is scattered at angle 1 = 64.0° and the oxygen nucleus recoils with speed 1.10 105 m/s at angle 2 = 47.0°. In atomic mass units, the mass of an alpha particle is 4.00 u and the mass of an oxygen nucleus is 16.0 u.

(a) Find the final speed of the alpha particle.
(b) Find the initial speed of the alpha particle.

http://i175.photobucket.com/albums/w138/kacortez/hrw7_9-22.gif

2007-12-11 13:36:09 · 2 answers · asked by Anonymous

I was asked this question and had no answer. I would like if someone could please answer.

2007-12-11 13:34:45 · 2 answers · asked by Canon 1

2007-12-11 13:30:13 · 2 answers · asked by Kalia 4

An object attached to the end of a string
swings in a vertical circle of radius 2.6 m as
shown. At an instant when theta=31 degrees, the speed
of the object is 13 m/s and the tension in the
string is 60 N.
The acceleration of gravity is 9.8 m/s^2 :

What is the mass m of the object? Answer
in units of kg.

2007-12-11 13:23:44 · 1 answers · asked by Anonymous

Consider the sinusoidal wave function:
y= 15cous (.157x-50.3t)

At a certain instant let point A be at the origin snf point B be the first point along the x axis where the wave is 60.0 out of hase with A. What is the coordinate of B?

Please help me with this question, by showing the steps to find the answer.

Thanks in advance.

2007-12-11 12:51:08 · 1 answers · asked by Anonymous

science test tmr and i dont get thissss .....help??

2007-12-11 12:38:14 · 2 answers · asked by Anonymous

When the same block of ice is raised the same vertical distance by pushing it up a 6.67 m long inclined plane, only 45 N of force is required. Calculate the work done to push the block up the plane.
J

2007-12-11 11:55:21 · 1 answers · asked by Anonymous

10 steps...
The final step much be inflating a balloon. It can pop, it just has to go past 6 inchs in diameter.
THANKS.

2007-12-11 11:46:15 · 4 answers · asked by summahhh! 4

Thanks.

2007-12-11 11:35:07 · 1 answers · asked by werdsoccer11 2

a 95 kg fullback, running at 8.2 m/s, collides in midair with a 128 kg defensive tackle moving the opposite direction. both players end up with zero speed.

[a] what is the change in the fullback's momentum?
[b] what is the change in the tackle's momentum?
[c] what was the tackle's original momentum?
[d] how fast was the tackle moving originally?


please show steps. @__@

2007-12-11 11:30:47 · 1 answers · asked by Anonymous

2007-12-11 11:29:40 · 1 answers · asked by wackyvorlon 3

Hey everyone I need your help. I was assigned a physics ISU and am wanting to build a guitar. I currently own an accoustic so I know the principles. I am wishing to build another accoustic for the project but I also want to play it (so no rubber band guitars). Where can I find plans (besides google) to build it (Im on a budget so I can't spend a lot)?

2007-12-11 10:38:16 · 1 answers · asked by raptorm79 1

One end of a uniform 4.0 m long rod of weight w is supported by a cable. The other end rests against the wall, where it is held by friction (see Fig. P8.24). The coefficient of static friction between the wall and the rod is µs = 0.50. (The wire makes an angle of 37° with the rod.) Determine the minimum distance, x, from point A at which an additional weight w (same as the weight of the rod) can be hung without causing the rod to slip at point A.

The figure can be found at http://www.webassign.net/sf5/p8_24.gif.

Looking at the figure first makes it easier i think. I'm kinda stuck. I have no idea what to do at all. Any help would be great. I feel like I have too many variables and not enough equations or something. help? Please? Thanks to anyone who takes the time to help me out. :)

2007-12-11 09:32:38 · 1 answers · asked by Anonymous

A mass sitting on a horizontal, frictionless surface is attached to one end of a spring; the other end is fixed to a wall. 6.0 J of work is required to compress the spring by 0.12 m. If the mass is released from rest with the spring compressed, it experiences a maximum acceleration of 20 m/s2.

1. Find the value of the spring constant.

2. Find the value of the mass.

All work would be greatly appreciated. Thank you =).

2007-12-11 09:19:45 · 3 answers · asked by Anonymous