Will sound travel faster in salt water or fresh water? think carefully about what is different between the two A. sound will travel the same sped in both
B. salt
C. fresh

Which changes of state do the labels represent? a: b: c:

Diamond will scratch quartz. true or false

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?