How long does it take an acorn to hit the ground after dropping from the branch of a tree 12.5 m high? remember that g=9.8 m/s^2!

1.0 s, 5.0 s, 2.6 s, or 1.6 s

**not sure about : (

If you put a helium-filled balloon in the refrigerator, what will happen?

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b. b. at twice the distance, the magnitude of the field is 2b. c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.

What is similar between metals and suspensions