Physics - October 2007

The cost of producing one unit of a product is given by
c=a+bx+ky
where x is the amount of labor used (in man hours) and y is the amount of raw material used (by weight) and a and b and k are constants. What does c/x =b mean? What is the practical interpretation of b?

2007-10-02 13:40:09 · 1 answers · asked by doreen 1

A satellite in orbit is not truly traveling through a vacuum--it is moving through very thin air. does the resulting air friction cause the satellite to slow down?

2007-10-02 13:37:27 · 4 answers · asked by back2back 2

im 15 & i cant sleep @ night. i lie awake in bed every school night. im so tired @ school. i lie awake as the hours go by. i dont drink caffeine or exercise. what should i do? i have to go to school tomorrow. i dont want to be tired. what if im up until three. i get up at six. you guys have to help me. do something! i have a big day tomorrow. you guys have to do something about this. i missed so much school already due to sleep. were so poor. we cant afford doctors or sleeping pills. so what do you guys recommend?

2007-10-02 13:32:06 · 9 answers · asked by Anonymous

2007-10-02 13:27:10 · 3 answers · asked by Irene K 1

When the block is pulled out to x = +5.0 cm, we must apply a force of magnitude 370 N to hold it there. We pull the block to x = 14.0 cm and then release it. How much work does the spring do on the block when the block moves from xi=+6.0 cm to (a)x= +3.0 cm, (b)x= -3.0 cm, (c)x= -6.0 cm, and (d)x= -9.0 cm?

2007-10-02 13:25:32 · 1 answers · asked by keeptheuroalive 2

A cylindrical concrete silo is 4 m in diameter and 33 m high. It consists of a 6000 kg concrete base and 38000 kg cylindrical concrete walls. Neglect the thickness of the silo walls and base.

(a) How high off the ground is the center of mass of the silo when it is empty?

(b) How high off the ground is the center of mass of the silo when it is two-thirds full of silage whose density is 820 kg/m3?

2007-10-02 13:03:32 · 1 answers · asked by Nathan R 1

a. find expressions for the velocity and acceleration of the moving body.

b. find the body's speed each time the acceleration is zero.

c. find the total distance traveled by the body from t=0 to t=2

Thank you very much.

2007-10-02 12:54:46 · 2 answers · asked by Anonymous

a) When is the particle moving to the right, when is it moving to the left?

b) Find the total distance traveled during the first 4 seconds

c) find the acceleration time at t. When is it 0?

d) When is the particle speeding up? When is it slowing down?


I have a few problems like this and any help that can be offered on any part is appreciated.

2007-10-02 12:47:06 · 3 answers · asked by ash 2

Please Help!

g - 2/5 = g + 4/7

Thanks

2007-10-02 12:44:23 · 3 answers · asked by jhkbbuoo 1

Here is it scanned.

http://s107.photobucket.com/albums/m316/myrainien/?action=view¤t=IMAGE12.jpg

2007-10-02 12:43:08 · 1 answers · asked by Phil 2

One has the velocity components Vx=1.0 m/s , Vy= 2.0m/s
The other has the velocity comp. Vx=2.0m/s , Vy= 3.0 m/s .
If both balls started from the same point , what is the angle between their paths?

2007-10-02 12:37:01 · 2 answers · asked by salvatore g 1

What is his acceleration on earth?
What is his mass on earth?
Mass on Jupiter?
Weight on Jupiter g = 2.64 x gravity of earth?
Weight on moon gravity is 1/6 of earth?
Mass on moon?
Mass as hes floating through space?
Weight as floating through space?

2007-10-02 12:36:25 · 1 answers · asked by gullivergraveler 1

2007-10-02 12:33:00 · 2 answers · asked by salvatore g 1

I need to move empty boxes from one conveyor to another by means of forced air. The empty box activates a sensor which then releases forced air at a different location to move the box on to a different conveyor. I need to keep the box straight as it is transferred to the other conveyor.

2007-10-02 12:26:34 · 1 answers · asked by DALLAS J THE SWEED 1

2007-10-02 12:24:29 · 1 answers · asked by JAMES 4

Gravitational force: Fg= Gm1m2 / (D)^2 Fg= gravitational force. G= gravitational constant = 6.67 x (10^-11 N.m^2/kg^2) m1= mass of one object m2= mass of other object d= distance between the two masses.

Cavendish, in his experiment to determine "G" suspended a mass of 167 kg at a distance of 0.200 m from a mass of 0.800 kg. If the force of attraction as indicated on the scale of his torsion balance was 2.23 x 10^-7 N, what value did he get for "G".

Determine the distance of seperation of two 10.0 kg masses in outer space if the gravitational force of attraction between them is 5.50 x 10^-8 N.

While picking up moon rocks on the moon, the Berenstain Bears wanted to determine the mass of a particular rock, but they had no equipment for weighing objects. They did know however that the mass of the moon is 7.34 x 10^22 kg and the radius of the moon is 1.74 x 10^6m and using their Newton sprint scale, they found the weight to be 77.6 N. What is the mass of this particular rock.

2007-10-02 12:24:03 · 3 answers · asked by Anonymous

By how much does a speed of a vehicle moving in a straight line change when it is accelerating at 6km/h-s ?

2007-10-02 12:07:25 · 2 answers · asked by missybitsy 1

You push a 34.4 kg crate at a constant speed of 1.66 m/s across a horizontal floor with coefficient of kinetic friction 0.34. The acceleration of gravity is 9.8 m/s^2.
a) At what rate is work being done on the crate by you?
b) At what rate is energy being dissipated by the frictional force?

I found the answer to a) which was 190.23 W. But I don't know what to do for part b. Please help!!

2007-10-02 12:06:35 · 1 answers · asked by Ron108 1

can attain a centripetal acceleration 1.5 times the free-fall acceleration. If the falcon is flying at 20 m/s, what is the radius of the turn?

Can anyone help me with this physics problem? Please don't just tell me the answer, I want to see how it's done!

2007-10-02 12:03:40 · 1 answers · asked by Anonymous

how would you find the volume of a liquid? of an regularly shaped object (like a cube)? of an irregularly shaped object (like a pen)? be descriptive please.

2007-10-02 12:02:54 · 1 answers · asked by Sarah S 3

As in: A car is capable of accelerating at a uniform rate of .85m/s2. What is the magnitude of the car's displacement as it accelerates uniformly from a speed of 83km/h to one of 94 km/h?

Please correct wrong steps in my chain of thought: I started by changing .85m/s2 to km/h by multiplying the entire thing by 1000/3600. Then I got stuck as I didn't know what magnitude of displacement was. Is it a measurement in m/s. Or seconds? Or metres?

2007-10-02 11:55:58 · 1 answers · asked by Anonymous

My teacher thought I was smart, but I made a lot of dumb mistakes.... I feel horrible.... It makes me not want to do my work eventhough I know I will......

2007-10-02 11:44:44 · 2 answers · asked by Anonymous

three ballot boxes are connected by cords, one of which wraps over a pulley having negligible friction on its axle and negligible mass. the three masses are mA= 30kg, mB=40 kg and mC=10kg. when the assembly is released from rest:
a. what is the tension in the cord connecting B and C
b. how far does A move in the first 0.250 s
could you help me figure out the right equations to use?
thanks.

2007-10-02 11:36:41 · 2 answers · asked by britpop1887 1

why is it that when you say A-bomb or H-bomb people tend to think of those impressive big bright balls of fire, or those big mushroom clouds. similar to these:
http://clintjcl.files.wordpress.com/2006/06/delme-h-bomb.jpg
http://www.astro.virginia.edu/class/oconnell/astr121/im/castle-romeo2-ex.jpg

but they never think of pictures like these?
http://students.umf.maine.edu/~donoghtp/hiroshima2.gif
http://pegasus.phys.saga-u.ac.jp/imagesMac-PC/ForPEACE/HiroshimaHosp.jpg
http://img53.imageshack.us/img53/572/nagasaki2if7.jpg

2007-10-02 11:11:37 · 7 answers · asked by mrzwink 7

A block of mass 0.600 kg is suspended using a spring and a string as shown in the diagram. In this situation, the spring is stretched and its length is 12 cm. The relaxed length of the spring is 7 cm.

a.)Find the tension in the string. Start from a fundamental principle and show all work.

b.)What is the spring constant ks of the spring. Show all work.

Please show how you did it too...I'm studying.

2007-10-02 11:08:31 · 1 answers · asked by Anonymous

10 points to the best reponse... Good luck!

2007-10-02 10:55:52 · 7 answers · asked by Anonymous

travels through the particles, attracting as it approaches, and repelling as it leaves from the other side?

2007-10-02 10:48:48 · 6 answers · asked by vEngful.Gibb0n 3

A driver traveling at 58 km/h sees a chicken dash out onto the road and slams on the brakes. Accelerating at -7 m/s2, the car stops just in time 23.8 m down the road. What was the driver's reaction time (i.e., the time that elapsed before he engaged the brake)?

If u don't know for sure, please don't try. Thanks!

2007-10-02 10:33:39 · 3 answers · asked by Bollywood Masti 4

Dynamics

2007-10-02 10:28:20 · 5 answers · asked by Jupiter 1

I need to describe a Hydrogen bomb to a 3rd grader in a report I'm doing, but saying, "A nuclear weapon that derives its destructive force from nuclear reactions of fusion or fission," would not be understandable by the average 3rd grader.

2007-10-02 10:28:18 · 5 answers · asked by minicruzer911 3