Qustion on physics/Biology past paper (1 Viewer)

[Lwang]

I was doing the past paper for physics. When I am solving long-response question, I notice a situation. When the question ask me on module 2 and let me explain the situation with Newton's law, I don't know answer it clearly. However, if the question asks me Module 4 especially the parallel or series circuit, I know how to answer it clearly such as using the formula and theory to explain.

Also, for biology past paper. I don't know how to answer the long-response question because I get no idea on theory (especially module2 and 3,4). Like the blood vessels, divergent evolution, Darwin's law or something. What should I do? (I think our school textbook/PPT for biology is kind useless

 

[coolcat6778]

how tf do you know circuits better than newton laws

have a look at this 4/4 sample from me which took up exactly all the lines given (nice non asshole marker):


No. This statement is ultimately false as the force between the two wires are of equal magnitude due to Newton's 3rd law of motion and the formula
where a difference in current would just result in equally less force for both wires. The rods most likely have different mass according to F = ma Newton's second law. Hence B is further since it is lighter.


Here's the shitty verbose official sample answer (that definitely doesn't fit within the amount of lines given):
Rod B does have a larger displacement from the original position than rod A. However this is not due to the current in rod A being larger. The force on rod B due to electromagnetic force from rod A is the same magnitude as the force on rod A due to electromagnetic force from rod B, according to Newton’s third law. The magnitude of electromagnetic force between µ I I F 1 2 both rods is given by 0 =  . l 2π r Since the larger displacement of Rod B cannot be explained by a larger electromagnetic force acting on it, it must be due to Rod B having a smaller mass. A smaller mass would F mean that it has a larger acceleration (a = ), causing it to have a larger displacement during m 1 time t (s =  at2).