6. factoring in the effect of friction, what must be true about the work output?
1. it must be less than 60 j.
2. it equals 60 j.
3. it must be greater than 60 j.

Explain how plate tectonics have changed earth’s surface over time. include the role of plate tectonics in the creation of landforms.

Acup of coffee sits on the dashboard of an automobile. the car goes around a sharp curve. even though you hold the cup still, coffee still splashes out. this can best be explained due to a) density. b) friction. c) gravity. d) inertia.

An atom that has gained or lost electrons is called an _