An airplane flying with a horizontal initial velocity of 80 m/s drops a package down to the ground. The plane is initially 490 meters above the ground. a) How long does it take the package to hit the ground?
b) What is the final vertical velocity of the package?
c) What is the horizontal displacement of the package?

Find the magnetic field a distance r from the center of a long wire that has radius a and carries a uniform current per unit area j in the positive z direction.

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.