Very dense * powerful gravitational field * extremely compact space object * spectroscope data reveal swirling gas observations by a group of astronomers were compiled. the astronomers were describing a they had discovered. a) quasar b) black hole c) solar system d) distant galaxy

Complete the statement about memory improvement. ( )involves organizing and breaking down information into easier groups to expand capacity. rehearsal is the verbal repetition of information. these techniques are especially important for the improvement of ( ) memory.

Two 2.0-cm-diameter disks face each other, 1.0 mm apart. they are charged to ±10 nc. what is the electric field strength between the disks? a proton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?

The built in flash in a compact camera is usally capable of giving correct exsposure for distance up to how many meters?