Need help with some modern physics and mechanics questions

[Kd Hashim]

Ok, so am going to post 20+ modern physics and mechanics questions, and am hoping you guys can help me with them. I study in university, and was surprised during my vacation by being told that I have a calculus and physics examination in a week. I took care of the calculus part, but I really need help with the physics, so I'll be posting each question, and once a question is answered and explained to me, I'll post the next one.

Shall we? All I need is a yes.

 

[tiny-tim]

Welcome to PF!

Hi Kd Hashim! Welcome to PF!

Yes.

But please start a new thread for each question.

And post them in the homework section, using the template (ie showing the work you've already done).

(btw, it might be many hours before you get a reply, so you may prefer to ask several questions at once, but again please put them in separate threads)