Tapered beams are used in a variety of applications to save both weight and cost. indeed, we see them in bridges, churches and tree branches. despite their weight savings, the weight of the beam must be consider when designing the structure lest it will fail. consider the illustrated tapered wood beam of length l = 6 m, thickness (into the screen) t = 20 cm, and big and small end heights h b i g = 100 cm and h s m a l l = 50 cm. knowing that the mass density of wood is rho = 700 kg/m 3 , determine the resultant force f r in n and resultant moment m r in nm about the base, i. e. big end, due to the weight of the beam.

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.

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.

close lines strong magnet less close weaker