Two fun-loving otters are sliding toward each other on a muddy (and hence frictionless) horizontal surface. One of them, of mass 8.00 kg , is sliding to the left at 5.50 m/s , while the other, of mass 5.65 kg , is slipping to the right at 5.50 m/s . They hold fast to each other after they collide. Part A Find the magnitude of the velocity of these free-spirited otters right after they collide.

Explanation:

Applying the law of collision:

Sum of momentum before collision = sum of momentum after collision

Both object move with the same velocity after collision

Momentum = mass × velocity

Sum of momentum before collision;

= 5.65(5.4)+(8)(-5.5)

= 30.51-44

= -13.49kgm/s

Sum of momentum after collision

= (8.0+5.65)v

= 13.65v

Equate;

-13.49 = 13.65v

v = -13.49/13.65

v = -0.988m/s

Hence the velocity of the otter after collision is 0.988m/s ( both moving towards the left)

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.