Physics - March 2007

Q.5 A train started from rest and moved with constant acceleration. At one time it was traveling at 33.0 m/s, and 160 m farther on it was traveling at 54.0 m/s. Calculate
a) the acceleration
b) the time required to travel the 160 m
c) the time required to attain the speed of 33.0 m/s
d) the distance moved from rest to the time the train had a speed of 33.0 m/s

2007-03-21 22:18:43 · 2 answers · asked by hafsa a 1

2007-03-21 22:10:56 · 6 answers · asked by KrishanRam(Jitendra k) 3

2007-03-21 22:09:16 · 5 answers · asked by Anonymous

2007-03-21 21:53:43 · 3 answers · asked by mrsjoshgroban 1

2007-03-21 21:45:52 · 3 answers · asked by nmahmoudi 1

2007-03-21 21:44:57 · 2 answers · asked by emorej d 1

2007-03-21 21:27:07 · 5 answers · asked by Lee D 1

An x-ray with a wavelength of 90nm or 2nm? Short reasoning? Im confused?

2007-03-21 20:43:09 · 3 answers · asked by El 1 1

A flashlight has 2 1.5 V D batteries arranged so that their voltages add together, with a 2-W bulb. These batteries are rated at 3.5 amp-hours each.

What is the total power that can be expeneded by the batteries? What is the total energy sotred in the flashlight batteries? How long can the flaishlight keep the bulb lit at its rated power of 2-W?

2007-03-21 20:38:49 · 1 answers · asked by El 1 1

A single electron has a charge of 1.6 x 10^-19C. How many electrons does it take to produce 1 ampere of current if they all pass a specific point in 1 second?

2007-03-21 20:35:47 · 5 answers · asked by El 1 1

for example while calculating accelaration due to gravity using simple pendulum,initially we assume that nobody knows the value of accelaration due to gravity.tat is we are the first person doing that experiment,then how we can calculate error in that experiment?

2007-03-21 20:07:03 · 4 answers · asked by joona k 1

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http://www.socratus.com
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2007-03-21 20:04:06 · 4 answers · asked by socratus 2

2007-03-21 20:02:45 · 4 answers · asked by Anonymous

2007-03-21 19:57:29 · 3 answers · asked by InsaneOrCroak 2

I need to calabrate my scales but it didn't come with any weights. Isn't there something around the house i can use?

2007-03-21 19:39:08 · 2 answers · asked by Anonymous

(a)Consider a pure ensemble of identically prepared spin 1/2 systems. Suppose the expectation values and and the sign of are known. Show how we may determine the state vector. Why is it unnecessary to know the magnitude of ?

(b) Consider a mixed ensemble of spin 1/2 systems. Suppose the ensemble averages [Sx], [Sy], and [Sz] are all known. Show how we may construct the 2x2 density matrix that characterizes the ensemble.

2007-03-21 19:36:06 · 2 answers · asked by MITIJAH 1

any reflection(moral lessons) on how light(physics) affects our life??

2007-03-21 19:32:06 · 4 answers · asked by Anonymous

Calculate the force of gravity on a spacecraft 25600 km (4 earth radii) above the Earth's surface if its mass is 1200 kg.

Answer should be in N (toward the earth).

2007-03-21 19:31:45 · 1 answers · asked by Jessie L 2

What is the maximum speed with which a 1110 kg car can round a turn of radius 65 m on a flat road if the coefficient of static friction between tires and road is 0.80?

Answer in m/s.

2007-03-21 19:29:17 · 3 answers · asked by Jessie L 2

Suppose the space shuttle is in orbit 430 km from the Earth's surface, and circles the Earth about once every 93.2 minutes. Find the centripetal acceleration of the space shuttle in its orbit. Express your answer in terms of g, the gravitational acceleration at the Earth's surface.

2007-03-21 19:28:19 · 1 answers · asked by Jessie L 2

Please don't refer me to a book. For one reason, a lot of scientific texts don't explain things very well. I think that is something that is changing with time. . . . (getting worse, have you noticed how a lot of older science books were written so much better?).

Sorry, but I doubt anyone will put it in laymans terms rather than an equation.

2007-03-21 19:27:20 · 8 answers · asked by Chris cc 1

Based on a question regarding Magnetic heating/global warming from a guy yesterday......Since the Sun is a very large Generator producing very large magnetic fields and the Earth is a very good conductor (Lenz Law: " Any conductor crossing a magnetic field will induce Eddy currents within itself heating it up" ) and it has been proven that not only the Earth is heating up (cyclic events) but the rest of the planets in the Solar system as well..(Only by a few degrees)....then Global warming is not caused by CO2 emmissions but maybe by this Phenonema .....Magnetic radiation from the Sun keeps the internal core of the planets in the Solar system going and going..( "By Induction Heating")....sorry Al !!!

2007-03-21 18:59:55 · 7 answers · asked by fuzzy 1

In the Bohr model of the hydrogen atom, the electron in the n = 10 level moves in a circular orbit of radius 5.29 x10-9 m around the proton. Assume the orbital angular momentum of the electron is equal to 10h/2.

Okay, I found in a book that h = 1.054x10^-34 kgm^2/s

I used the equation L = Iw
I = mr^2
and then plugged the values in to get w.

I don't understand what the n =10 means so my answer is wrong. Please help!!!

2007-03-21 18:34:16 · 2 answers · asked by Anonymous

2007-03-21 18:27:37 · 4 answers · asked by salwantex 1

The Parliament Building tower clock in London, has hour and minute hands with lengths of 2.70 m and 4.50 m and masses of 60.0 kg and 100 kg, respectively. Calculate the total angular momentum of these hands about the center point. Treat the hands as long, thin uniform rods.

2007-03-21 18:18:31 · 1 answers · asked by Anonymous

considering the scientific meaning of the word acceleration, how could using the term accelerator when talking about a car's gas pedal lead to confusion?

2007-03-21 18:18:10 · 2 answers · asked by John S 1

2007-03-21 17:52:30 · 7 answers · asked by kevin p 3

someone sits on a rotating stool and rotates at 30 rev/min while holding 10kg mass in each outstretched arm. The moment of inertia of the person plus the stool is 5 kg.m² and is considered constant. the two masses initially rotate at a radius of 1.0m but then the arms are folded to .15m. what is the new angular velocity of the system (in rev/min)??

2007-03-21 17:40:27 · 3 answers · asked by Anonymous

mention its advantage too,. and react well

2007-03-21 17:34:00 · 1 answers · asked by NuRz 1

Resistance problem?
the total power consumed by two resistors , connected in a parallel is 25 watts .if the voltage applied is 5 volts dc and the current in one resistor is 1.5 ampere ,what are the resistances of the two resistors?


please show how you get the two resistances,thanks

2007-03-21 17:29:57 · 5 answers · asked by harry s 1