3) A 80Kg sled is being pulled with a force of 150N. The kinetic friction coefficient between the sled and the snow is.125. What is the magnitude of Acceleration of the sled?

Explanation:

Net Force

There are four forces acting on the sled:

Its weight W directed down

The normal force N directed up

The applied force F directed left

The friction force, opposite to the motion, directed right.

The forces are shown in the free-body diagram of the figure below.

The body is in equilibrium in the vertical direction, thus:

N = W = m.g

N = 80 Kg . 9.8

N = 784 Nw

In the horizontal direction, the sum of the force vectors is the net force:

Fn = F-Fr

It's assumed the left as positive.

The friction force is calculated as:

Fr =0.125*784 Nw

Fr = 98 Nw

According to Newton's second law, the net force is equal to the mass by the acceleration:

F-Fr=m.a

The acceleration can be calculated by solving for a:

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.

cell differentiation  is how generic embryonic  cells  become specialized  cells. this occurs  through a process called gene expression. gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a  cell  functions.

explanation: