Physics - February 2007

it evaporates less than a week

2007-02-14 03:30:22 · 6 answers · asked by jaime jg 1

Asmall radio operates on 5.00 V and has a resistance of 50.0 amps. At what rate does the radio use electric energy? ____ ____

2007-02-14 03:20:39 · 2 answers · asked by Hey ;) 3

A 15 kg block slides on a level frictionless surface while attached by a light string to a 5.0 kg hanging mass where the string passes over a massless frictionless pulley. What is the tension in the connenting pulley??

So confused, if you could help/explain I would appreciate it!!

thanks!!

2007-02-14 03:19:56 · 1 answers · asked by Anonymous

A bird accelerating from the rest at a constant rate, experiences a displacement of 28 m in 11 sec. What is the final velocity after 11 s?

I think it's zero, am I right??

please help thanks!

2007-02-14 03:14:18 · 6 answers · asked by Anonymous

2007-02-14 02:27:17 · 7 answers · asked by Anshu 1

An elevator weighing 20,000 N is supposed by a steel cable. What is the tension in the cable when the elevator is being accelrated upward at a rate of 3.0 m/s^2.

Would it be: (20,000)(3.0) + (20,000)(9.8) = 26,100N?

please help, I'm confused with this one, thanks!

2007-02-14 02:07:21 · 4 answers · asked by Anonymous

2007-02-14 02:06:06 · 2 answers · asked by Anonymous

two balls with different masses but identical shapes and sizes are droped from a certain height. Which one would land first if there is no air resistance?

2007-02-14 02:04:36 · 8 answers · asked by Sabz 3

A rock is thrown horizontally at 15 m/s from the top of a cliff. If it takes the rock 4 seconds to hit the ground below, how far from the base of the cliff will the rock have traveled?

2007-02-14 02:04:10 · 3 answers · asked by Anonymous

2007-02-14 02:02:18 · 2 answers · asked by Anonymous

when a light travels from rarer medium to denser medium it moves towards the normal. why it moves towards the normal? i wud like to know the perfect answer pls!!
protons are present in a nucleus. both have the same charge. do they repel? if not why?

2007-02-14 01:59:52 · 2 answers · asked by nandhini 2

We need it for our 9th grade Science class. Please help me out. Thanks :)

2007-02-14 01:29:40 · 2 answers · asked by 6 Doors Down 2

We need it for our 9th grade Science class. Please help me out. Thanks :)

2007-02-14 01:28:42 · 3 answers · asked by 6 Doors Down 2

hi , i waana ask a question regarding physics,how can w e recognise , there is a coolision b/w a gas molecule, why the coolision takes place, why the rreal gas get diverted , than an idreal . gas

2007-02-14 01:27:12 · 3 answers · asked by raghav m 1

solar panels directly faces sun so they can receive more energy than when it is at horizontal. But in cloudy weather, the solar panels receieve more energy when it is at horizotal. why is it so?

2007-02-14 01:20:07 · 3 answers · asked by ?ټ֠? size= 1

Rearrange the ideal gas equation (PV=nRT) to give the following expressions:
Keep in mind that the formula is interpreted from left to right with operations in parentheses done first. Add parentheses if needed.
A) n = ?
Equation:
B) An equation that relates V and n when P and T are constant. Give the expression involving V and n which is equal to a constant. There are two equivalent answers, one the reciprocal of the other. Choose the answer with V in the numerator.
Equation:
C) n/V = ?
Equation:

2007-02-14 01:15:26 · 5 answers · asked by BettyBoo 1

Convert the following to torr.
[1 atm = 760. torr], [1 atm = 1.013E5 Pa].

A) 1.00 Pa
B) 125 kPa
C) 70.8 atm
D) 1.83E-10 atm

2007-02-14 01:13:51 · 3 answers · asked by BettyBoo 1

Is it possible for a compound to absorb light of a certain wavelength and emit light of a shorter wavelength? Normally compounds emit light of a longer wavelength like UV to visible. I know shorter wavelengths have more energy so perhaps it has to absorb 2 photons for every 1 it emits.

2007-02-14 01:01:52 · 3 answers · asked by AaronX 2

It is the thing that is liked by every one.

2007-02-14 00:58:46 · 3 answers · asked by Anonymous

I had passed M.sc. in physics through distance education mode.Can I apply for Ph.d. programmes?

2007-02-14 00:16:09 · 5 answers · asked by karnam r 1

My year 5 class want to know why colours fade when left in sunlight. can anyone give a simple explanation?

2007-02-13 23:58:30 · 7 answers · asked by Anonymous

We tend to look and seek to understand the universe in 2 ways: in a 3-dimensional matrix on the terrestrial world, and in a 2-dimensional matrix outside the solar system enclosing our planets, but using our ideas of space and time. It only seems correct to assume that there may be some other active dimension not available to the faculties of reason and logic to udevelop a n acceptable explanation of the totality of our conceptual knowledge. Please think positively and try to offer helpful comments and also understand that I am not seeking a mystic answer to this enquiry. Many thanks.

2007-02-13 23:48:50 · 3 answers · asked by polymath 1 3

2007-02-13 23:42:22 · 3 answers · asked by jay s 1

Why is it that when we try to get a pitcher of water from a water dispenser, the water usually makes the sound "bluugggee", and I see some bubbles going up?Why is this so?

2007-02-13 23:31:25 · 2 answers · asked by p319 1

if I couple a one HP. motor to to a magnetic brake M/C, and measure the current and temperature of the motor to prove that 746 watts are being consumed. where does the energy go! I made a 8 pole rotor attached to a motor shaft and positioned a stator with 8 poles alternating polarity " 1mm. gap accross the rotor and there was no temperature rise in the poles of the permenant magnetics in fact they were slightly cooler due to air flow. do we write this off because of "magnetic mystery" if it is because there is no friction, it is there in slip when an electric motor requires torque

2007-02-13 22:54:34 · 4 answers · asked by Anonymous

2007-02-13 22:41:36 · 18 answers · asked by sunny don 1

2007-02-13 22:37:44 · 3 answers · asked by thiru 1

How does a dichroic filter work? Specificaly how does it reflect certain wavelngths and pass other wavelengths. I think it passes wavelengths because these wavelengths do not match the energies of certain electron orbitals. could you provide a fuller explaination. thanks

2007-02-13 22:23:37 · 2 answers · asked by nikos k 1

Could someone provide a link? With diagrams, too. Thanks.
While you are at it, what on earth is a quasar and why can it be used for gravitational lensing?

2007-02-13 22:09:45 · 5 answers · asked by saffy 2

2007-02-13 22:09:41 · 2 answers · asked by Paull 2