Which of the following is/are true regarding magnetic fields?
i. magnetic field lines separate magnetic poles.
ii. magnetic field lines are spaced farther apart at the magnetic poles.
iii. magnetic fields are strongest at the magnetic poles.
a. ii only b. i, ii, and iii
c. i only
d. iii only

The force will determine the acceleration.

Diamond will scratch quartz. true or false

You are driving directly behind a pickup truck, going at the same speed as the truck. a crate falls from the bed of the truck to the road. (a) will your car hit the crate before the crate hits the road if you neither brake nor swerve? (b) during the fall, is the horizontal speed of the crate more than, less than, or the same as that of the truck?