Physics - March 2007

A. It depends only on its intake temperature.
B. It equals the difference between its heat intake and heat exhaust.
C. It depends only on its exhaust temperature.
D. It equals its heat intake.

2007-03-10 08:04:25 · 1 answers · asked by Anonymous

A. melting point
B. heat of vaporization
C. boiling point
D. heat of fusion

2007-03-10 08:02:07 · 8 answers · asked by Anonymous

I have some data. I have theorized that it should be close to the linear trend Applied Force predicted [N] = 0.225 [KG] * Acceleration [m/s/s].

I take the acceleration data I have collected and put it through this predictive function. I plot the resulting theoretical data as Forve vs. Acceleration.

Should I instruct MS excel to add a linear trend(along with the y=mx+b output the linear fit produces) to this predictive data?

why or why not??

2007-03-10 07:36:46 · 3 answers · asked by Anonymous

With 50.000 volts not kill you

2007-03-10 07:32:57 · 3 answers · asked by colin050659 6

2007-03-10 07:30:15 · 14 answers · asked by colin050659 6

surface tention of water =72dyne/cm

2007-03-10 07:07:09 · 2 answers · asked by miinii 3

he drawing shows a lower leg being exercised. It has a F = 48 N weight attached to the foot and is extended at an angle with respect to the vertical. Consider a rotational axis at the knee.
At what angle does the magnitude of the torque equal 13 Nm?

2007-03-10 06:54:59 · 1 answers · asked by dawgs1918 1

I was reading "Relativity: An Introduction for Younger Readers." One of the chapters was about the twin paradox. Some dude named Al went on a spaceship and traveled 10 lightyears. It only felt like 36 days had passed for him and 10 years had passed for his twin Ike . I don't understand why it only felt like 36 days,for Al, which means I don't understand relativity. Can someone explain this to me?

2007-03-10 06:47:55 · 7 answers · asked by lsupergeorgel 1

so I saw this thing on the discovery channel where they used soundwaves to melt plastic.

how in the world does that work? I didn't know sound could do that. could soundwaves melt my ears off?

2007-03-10 06:41:38 · 2 answers · asked by hobo 6

What are main chemical properties of resistors usually used in introductory labs? Thank you!

2007-03-10 06:35:22 · 3 answers · asked by Anonymous

I would also be interested in knowing how much incline is needed for a typical car to coast along at 60 mph. Or a single loaded train car. Or a long loaded train.

Interestingly a good glider only needs a 60 to 1 (1.66 percent) incline to coast along at 60 mph, and thus only requiring 1 lb of steady pull for every 60 lbs it is carrying and at 60 mph). Thus it appears it is difficult for wheel supported machines on a solid surface to carry weight at 60 mph with as little drag as the machine that somehow carries it weight on the squishy air. Very amazing to me. The less drag any transportation machine encounters for every pound it is carrying, the less slope it needs to coast on.

I have learned a good bicycle with a good bicyclist, needs a 13 percent slope to coast along at 60 mph, thus needing 8 times as much slope as the glider needs to coast at that speed. Yet I realize a loaded and streamlined truck does not need near that much incline.

God Bless

2007-03-10 06:24:34 · 1 answers · asked by truthseeker 1

Well, I know that the egg drop is a fairly common project among physics classes, but while we were supposed to research possible designs, I found very few to suit this criteria.
-The mass of the device (w/o egg) cannot exceed 100g.
-Materials are limited to:
2 sheets of paper, 2 paper towel tubes, half of a 2-liter soda bottle, string, rubber bands, straw, and tape
Any suggestions?

2007-03-10 06:23:25 · 3 answers · asked by polishmonkey266 1

It appears that mass is not an intrinsic property of a thing, but rather, depends on all other matter in the universe. I would like further explanation. Here is a quote from Mendal Sach in an article in Physics Today (Feb, 1969) entitled "Space, Time and Elementary Interaction in Relativity"…

"The derived mass field depends upon the curvature of space-time. The latter geometrical property is, in turn, a manifestation of the mutual coupling of all the matter within the closed system. Thus, if the rest of the universe should be depleted of all matter, the mass of the remaining electron, say, should correspondingly go to zero. The derived field relationship is then a quantitative expression of the Mach principle because here the inertial mass of any amount of matter is indeed a well defined function of its dynamic coupling with all of the other matter within the entire closed system."

2007-03-10 06:22:37 · 5 answers · asked by eroticohio 5

Plz explain clearly and in detail

2007-03-10 05:47:09 · 2 answers · asked by Devil 4

What was the first man made object to break the sound barrier?

2007-03-10 05:40:04 · 4 answers · asked by Kevin M 3

resistance of a wire work. if the voltmeter is put in parrallel of the resistance wire, what is the voltage recognising/reading?

2007-03-10 05:34:23 · 4 answers · asked by LoVE LiFE 3

A 3.0 kg mass is located at x=2.0 cm and y=4.0 cm.

A 3.0 kg mass is located at x= - 5.0 cm and y = 2.0 cm.

A 4.0 kg mass is located at x=3.0 cm and y= - 3.0 cm.

Where is the location of the center of mass??

please help thanks!

2007-03-10 05:21:50 · 4 answers · asked by Anonymous

I have some data. I have theorized that it should be close to the linear trend Applied Force predicted [N] = 0.225 [KG] * Acceleration [m/s/s].

I take the acceleration data I have collected and put it through this predictive function. I plot the resulting theoretical data as Forve vs. Acceleration.

Should I instruct MS excel to add a linear trend(along with the y=mx+b output the linear fit produces) to this predictive data?

why or why not??


please help!!! thanks!!

2007-03-10 05:18:30 · 3 answers · asked by Anonymous

Anyone with good answer send me an e-Mail at:

eel-man-sec-9@hotmail.com

2007-03-10 05:11:28 · 2 answers · asked by WRDSB 1

has to be in between 5 and 3

2007-03-10 05:05:40 · 5 answers · asked by boboboboboboboboo 2

A CD has a diameter of 12.0 cm, if the CD is rotating at constant freq of 4.0 cyles per second, then the period of the rotational motion is??


Also, a CD has a diameter of 12.0 cm. If the CD is rotating at a constant angular speed of 200 revolutions per minute, then the tangential velocity of a point on the circumference is???


2 different questions, if you can help that would be great, best answer will get 10 points!! thanks!!

2007-03-10 04:25:33 · 4 answers · asked by Anonymous

An astronaut in a space suit is motionless in outer space. The propulsion unit strapped to her back ejects some gas with a velocity of 50 m/s. The astronaut and space suit after the gas is ejected is 120 kg, the mass of the gas ejected is???

please help thanks!! best answer gets 10 points!

2007-03-10 04:20:01 · 3 answers · asked by Anonymous

A person whose eyes are 1.70 m above the floor stands in front of a plane mirror. The top of her head is 0.13 m above her eyes.

(a) What is the height of the shortest mirror in which she can see her entire image?

(b) How far above the floor should the bottom edge of the mirror be placed?

2007-03-10 04:13:25 · 3 answers · asked by layc_510 2

A 10.0 cm high object is situated 28.0 cm in front of a convex mirror that has a radius of curvature of 50.0 cm.

(a) Find the image distance (include the sign).

(b) Find the height of the image.

2007-03-10 04:12:27 · 2 answers · asked by layc_510 2

A 5.0 cm high object is situated 23.0 cm in front of a concave mirror that has a radius of curvature of 12.0 cm.

(a) the image distance (include the sign)

(b) the height of the image

2007-03-10 04:11:27 · 2 answers · asked by layc_510 2

Would the plane weigh heavier if the birds were on their perches or flying about their cages?

2007-03-10 04:06:33 · 12 answers · asked by Andrew H 2

An 1800 kg car traveling at 5 m/s strikes a wall. If the car comes to rest in 0.5 sec then the average force of the wall on the car is??

little confused on how to do this, please help, thanks

2007-03-10 04:03:48 · 3 answers · asked by Anonymous

A 5.0 kg ball is moving at 4.0 m/s to the right and 6.0 kg ball is moving at 3.0 m/s to the left. The total momentum of the system is??

please help, thanks!

2007-03-10 03:59:08 · 1 answers · asked by Anonymous

If the momentum of a ball is doubled, then the kinetic energy is??

please help, thanks!

2007-03-10 03:57:56 · 2 answers · asked by Anonymous

A ball of mass 0.25 kg is thrown 3 metres vertically into the air and is caught
by an athlete 1 metre from the ground as it falls. The acceleration of the ball
due to gravity is 9.81 m s-1 and the ball is in contact with the athlete’s hand
for 0.2 s before it has stopped moving. Calculate:
(i) the force exerted by the ball on the athlete’s hand
(ii) the impulse produced by the ball on the athlete’s hand
(iii) the velocity of the ball immediately before impacting on the athlete’s
hand.

2007-03-10 03:44:03 · 6 answers · asked by Steven B 1