Arock is dropped from a bridge. what happens
to the magnitude of the acceleration and the
speed of the rock as it falls? [neglect friction.]
(1) both acceleration and speed increase.
(2) both acceleration and speed remain the
same.
(3) acceleration increases and speed decreases.
(4) acceleration remains the same and speed
increases.

In a system, when potential energy decreases, then entropy also decreases. true false

The discovery of the electron as a subatomic particle was a result of

Along wire carrying a 4.2 a current perpendicular to the xy-plane intersects the x-axis at x=−1.7cm. a second, parallel wire carrying a 3.0 a current intersects the x-axis at x=+1.7cm. part a at what point on the x-axis is the magnetic field zero if the two currents are in the same direction? express your answer to two significant figures and include the appropriate units.