Module 5 physics questions (1 Viewer)

[kractus]

The answer is A but I'm confused. Isnt velocity always changing? And if A is right wouldn't that make C right aswell?

Also, does the angular velocity change or is it constant at these two points and why?

Where x is at a higher altitude than y

 

[Average Boreduser]

Just the look of physics questions makes me wanna

 

[011235]

The particle has uniform speed, but not uniform velocity, since direction is constantly changing (and velocity is the vector, speed is the scalar).

Kinetic energy is a scalar. Momentum is a vector. (Physics isn't very rigorous about the following) Technically, in the kinetic energy formula, we are using the scalar speed, not velocity. In the momentum formula, we are using the vector velocity (multiplying it by a scalar, mass).

Effectively momentum retains direction, so since direction changes, momentum changes but kinetic energy does not.


Regarding your second question, what is rotating and around what?

 

[yanujw]

Also, does the angular velocity change or is it constant at these two points and why?
View attachment 37341
Where x is at a higher altitude than y
[/QUOTE]

Angular velocity is the same. They rotate at the same rate around Earth regardless of differences in their distance to Earth's centre.