Help with Oscillation - Can't Figure Out the Answer!

[cupid.callin]

Homework Statement

Hi all

The Attempt at a Solution

#1
I can't understand what exactly oscillation is. I guessed a,b,c are correct but c is not the answer ... why?

#2
No idea.

#3
a, b ?

#4
i guessed its c,d ... but again i was wrong

#5
No idea, sorry :(

 

[ideasrule]

#1
I can't understand what exactly oscillation is. I guessed a,b,c are correct but c is not the answer ... why?

Oscillatory motion simply means the mass moves back and forth from one position to another. It doesn't have to be periodic: it could complete the first cycle in 1 second and the second cycle in 4, for example, even if it moves between the same two points.

#2
No idea.

Here's a hint: in a non-inertial frame, everything feels a force of ma. This is exactly equivalent to a gravitational field of strength "a"--in fact, Einstein's equivalence principle says there's no way to differentiate the two. So think about a spring hanging downwards in Earth's gravitational field; it will behave in exactly the same way as a spring hanging downwards in a room accelerating upwards at "g".

#3
a, b ?

No, b is not correct. Imagine a spring going through one complete cycle, and see which of the quantities remain positive throughout the cycle. Remember that if the vectors are parallel, the dot product is positive; if they're antiparallel, it's negative.

#4
i guessed its c,d ... but again i was wrong

c and d are definitely correct. There's one more option that's also right.

#5
No idea, sorry :(

Have you learned about resonance?

 

[gneill]

#4 is a bit problematical if one considers the effects of the Earth's rotation on a falling mass when the tunnel is not placed along the rotational axis. Perhaps they should have specified a non-rotating Earth.

 

[cupid.callin]

hi guys
sorry for late reply

#3
it should be a,b because before this question was a question asking about negative quantities. whose answer was c,d
and v is always in direction of r ... i guess

#4
@gniell
but still it will look like shm for someone on Earth even if tunnel is not along rotation axis
it might be parabolic or someone not rotating with earth

@ideasrule
i know you mean acd but its also wrong
answer includes b

 

[rwisz]

Dear fellow scientist,

I understand that you are struggling with understanding oscillation and finding the correct answer. Oscillation refers to the repeated back and forth motion of an object or system between two points. It can be seen in various phenomena such as pendulum swings, sound waves, and even the movement of atoms in a solid.

Regarding your attempts at finding the correct answer, it is important to first understand the concept of oscillation and its properties. From there, you can apply that knowledge to the given question. It is also helpful to review any relevant equations and definitions. If you are still struggling, I recommend seeking assistance from a teacher or colleague who may be able to provide further explanation and guidance. Remember, science is all about trial and error, so don't be discouraged if your initial attempts are not successful. Keep exploring and learning, and you will eventually find the answer. Good luck!