A beam pivoted at one end has a force of 5.0N acting vertically upwards on it as shown. the beam is in equilibrium.
what is the weight of the beam.

The weight of the beam at the given equilibrium position is 2.0 N.

The given parameters;

The weight of the beam is calculated by taking moment about the pivot of the beam as follows;

clockwise moment = anticlockwise moment

Thus, the weight of the beam at the given equilibrium position is 2.0 N.

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Option A

Explanation:

Taking moments about the pivot, we know that the sum of clockwise moments equal the sum of anticlockwise moments at equilibrium. Therefore, at the pivot point

5N*2cm=Weight of beam*5 cm

Weight of beam = 5N*2cm/5cm=2 N

Clearly, the weight of the beam is 2N for it to remain in equilibrium

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.