Should rare earth metals continue to be used in magnets? how come?

How does an observation about an object differ from an inference about that object

12. ritu obtained a distinct image of a distant tree on the screen with the of a concave mirror.to find the focal length of the mirror she has to measure the distance between: (a) mirror and the tree. (b) screen and the tree.(c) mirror and the screen. (d) mirror and tree as well as between screen and the tree.

The & support center can provide online tutoring, answers to frequently asked questions (faqs), and information about how to contact your instructors.using the topics below, create an example of reinforcement for each