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# Physics Questions and Answers

 Mechanics | Kinematics | Dynamics 4250 3440 Electric Circuits 824 536 Molecular Physics | Thermodynamics 686 513 Other 535 472 Electromagnetism 510 343 Optics 498 329 Astronomy | Astrophysics 221 127 Acoustics 188 93 Atomic Physics 167 94
 Electrodynamics 149 107 Quantum Mechanics 143 74 Nuclear Physics 107 72 Solid State Physics 51 23 Relativity 44 24 Computational Physics 11 10 Plasma Physics 11 7 Field Theory 8 4

8 403Questions:

6 268Free Answers by our Experts:

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At the low point in its swing, a pendulum bob with a mass of 0.2 kg has a velocity of 5m/s. How high will the bob swing above this low point?
 Answered!
A 0.2 kg ball is twirled at the end of a string in a horizontal circle with a radius of 0.6 m. The ball travels with a constant speed of 4.0m/s. What are the values of the horizontal and vertical components of the tension in the string?
 In Progress...
what is the best book to read to understand statistical mechanics?
thank you
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3.1​A tungsten filament is 35 mm long and has a radius of 7.5 mm. Calculate the current emitted from this filament at temperatures of 2400 °C and 2500 ºC.
 Answered!
can a compound semi-conductor be considered as extrinsic semi-conductor due to its compound form?
 Answered!
If light travels in a straight line, why a rainbow appears curved?
 Answered!
A hollow cylinder of radius 10 cm rotates about its axis which is vertical. A small body remains in contact with the inner wall if the frequency of rotation is 200 per minute but falls at lower frequencies. Find the com-efficient of friction between the body and the cylinder.
 In Progress...
how the energy is produced in a nuclear reactors?
 Answered!
A hiker sets out on a trek heading [N35degreesE] at a pace of 5.0km/h for 48.0 min. He then heads west at 4.5km/h for 40.0 min. Finally, he heads [N30degreesW] for 6.0km/h, until he reaches the camground 1.5 hours later. What is his total displacement?
 Answered!
1.Below is the description of gthe position in metres of the puck as it moves in the x plane where time is in seconds ,
X=t^3+2t^2+t
(a)How long did the puck move after 2 seconds?
(b)What is the velocity of the puck at 2 seconds?
(c)What is the acceleration of the puck at 2 seconds?

2.An object moves in a uniform circural motion with centripetal acceleration of 25 m/s^2 ,if the diameter of the circle is 70m,
(a)Find the velocity at which the object is moving.
(b)Find the revolution period of the motion.
 In Progress...
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