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A Numerical from Kinematics
Pooja asked:
an aeroplane flies 400km due west from city A to city B,then 300km north east to city C,and finally 100km north to city D. how far is it from city A to D?in what direction must the aeroplane had to return directly to city A from city D?
Answer will be posted soon
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magnetic field
Which one we should use Bio saverts law or amperes law to find a magnetic field?
chirag
Answer
Both are used to find the magnetic field .In the case of physical magnet Biot-Savarts law can be used
In the case of a current carrying conductor Ampers circuital law is used
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Average Speed
Naman Asks:
“A car travels from A to B with a speed of 30km/h and returns back to A with a speed of 50km/h.Find distance,displacement,average speed and average velocity ifdistance between A and B is 100km.”
Answer:
Distance 200 m
Displacement 0
Average velocity 0
Average speed = = 37.5 kmph
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Matter from energy !
Agan asks:
How can we can transform energy into matter? I know x rays can collide to form leptons but how to create protons and neutrons from photons?
Answer will be posted soon. Members and visitors are always welcome to post their answers as comments.
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A Physics Problem from Projectile Motion and Laws of Motion
A fish launches himself from a 6 cm cannon straight up in the sir. When he leaves the cannon he is traveling at 6.5 m/s. assume constant acc while in the cannon.
~What acceleration did the cannon apply to the fish?
~How long was he in the cannon?
~Once the fish is flying upwards, what is his acceleration?
~once he left the cannon, how high did he travel in the air?
The fish can hold his breath for 1.2 s out of water. Assuming that while in the cannon the fish is underwater and once launched he is immediately in the air
~How long until he splashes back down into the water?
~What was the fish’s velocity when he splashed back into the water?
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Projectile motion – A problem from real life situation
Three identical stones are thrown with the same initial speed from the top of a cliff into the river below. atone 1 is launched at an angle of 20 degrees above the horizontal; stone 2 at an angle 20 degrees below the horizontal; and stone 3 directly along the horizontal. just before entering the river, which stone has the greatest speed?
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Physics Masters
Vivek Sawhney
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