HS Physics HW help

High School Physics Area

Moderators: Zyrell, TchTerri, Message Board Admins

HS Physics HW help

Postby cmsevero » Wed Mar 26, 2014 1:17 pm

Hello,
I need some assistance with energy and collision formulas and problems.

Thank you
cmsevero
 
Posts: 1
Joined: Wed Mar 26, 2014 1:11 pm
Location: PA, USA

Re: HS Physics HW help

Postby the_hill1962 » Wed Mar 26, 2014 2:55 pm

Yes, some of those problems can get confusing. When you add in there are various types of collisions such as elastic and non-elastic, I don't blame you for needing help.
Could you give us a specific formula or problem that you are having a difficult time with? Let us know what it is about the formula or problem that you don't understand as we don't just "do homework" for you.
the_hill1962
PATH Tutor
 
Posts: 102
Joined: Tue Feb 19, 2008 1:23 pm
Location: Texas, USA

Re: HS Physics HW help

Postby DrPhil » Wed Mar 26, 2014 5:12 pm

Conservation of momentum is more fundamental than conservation of energy - since inelastic interactions may convert some of the energy to heat.
Objects that bounce off each other (if not too fast) are generally elastic, and both momentum and energy are conserved.
Objects that stick together after the collision are Inelastic, and only conservation of momentum applies.

Yes, we would like to see examples WITH YOUR WORK so we can see where you are getting stuck.

DrPhil (not the TV guy)
DrPhil
PATH Room Leader
 
Posts: 89
Joined: Sat Mar 26, 2005 12:50 pm
Location: New Mexico

Re: HS Physics HW help

Postby mohammed123 » Sun May 04, 2014 7:32 pm

As a result of his observations, R¨omer concluded
that the time interval between eclipses
of Io by Jupiter increased by 17.2 min during
a 6.6 month period as the Earth moved
from a point in its orbit where its motion
is toward Jupiter to a diametrically opposite
point where it moves away from Jupiter. The
presently accepted value of the speed of light
in vacuum is 2.998 × 108 m/s.
Find an average value for the distance between
the Earth and the Sun.
Answer in units of km
mohammed123
 
Posts: 2
Joined: Sun May 04, 2014 7:29 pm

Re: HS Physics HW help

Postby mohammed123 » Sun May 04, 2014 7:33 pm

i cannot figure out the answer, please help me
mohammed123
 
Posts: 2
Joined: Sun May 04, 2014 7:29 pm

Re: HS Physics HW help

Postby DrPhil » Sun May 04, 2014 10:21 pm

This may be easier than it seems.

Consider the two points on the Earth's orbit, as described.
The difference of light travel time to the two points is 17.2 minutes.
The speed of light is 2.998x10^8 m/s.
How far apart are the two points?
How are the two points related to the distance of each from the Sun?
DrPhil
PATH Room Leader
 
Posts: 89
Joined: Sat Mar 26, 2005 12:50 pm
Location: New Mexico


Return to High School Physics

Who is online

Users browsing this forum: No registered users and 1 guest