HSC Physics Question (1 Viewer)

[hklion101]

How do u do this?

 

[jazz519]

Find Potential energy of the magnet before the fall E=mgh=0.1*9.8*1=0.98 joules. All of this should be converted to kinetic energy so initially u have 0.98 joules of kinetic energy and some of this will be converted to electrical energy which is then converted into light, heat etc. so final kinetic energy is ek=1/2mv^2=0.722 joules. The difference between the 0.98 and 0.722 is the electrical energy so 0.26 is the answer

 

[hklion101]

I got the same answer but the solutions say B, so is it safe to assume the solutions are wrong???

 

[jazz519]

I got the same answer but the solutions say B, so is it safe to assume the solutions are wrong???

Yeah not sure how u can have 3.7 joules when the highest value in the other values is less than 1

 

[jathu123]

Yes its D
http://community.boredofstudies.org...rsions-calculations-question.html#post7184556