A boiling pot of water (the water travels in a current throughout the pot), a hot air balloon (hot air rises, making the balloon rise) , and cup of a steaming, hot liquid (hot air rises, creating steam) are all situations where convection occurs.
Advantages of copper cables are that copper is an extremely powerful conductor of electricity and much more stable over time. It can withstand higher temperatures than aluminum and is more resistant to damage.
Disadvantages: Copper is more expensive and heavier and thus requires structural support.
Advantages of aluminum cables are that it is less expensive, easier to work with and light weight and so does not need structural support when strung over long distance.
Disadvantages: Aluminum is more susceptible to corrosion and requires periodic replacement. It needs much greater maintenance.
Advantages of steel cables are that steel does not rust, is fairly cheap and readily available. It has a higher tensile strength too.
Disadvantages: Steel cables are less ductile and are therefore more susceptible to fatigue.
Answer:
You can not convert from seconds to meters.
Answer: 〖4.1x10〗^(-3)
Explanation:
From the question, the parameters given are:
- Cross section (area)= 9.5mm x 13mm= 123.5 〖mm〗^2 = 0.0001235m^2 (after converting from 〖mm〗^2 to m^2 which is the standard unit for measuring length)
- Modulus of elasticity = 69 GPa = 69 x 〖10〗^9 N/m^2
We can solve this using the formula for elastic modulus ( E ) = stress/strain
making strain the subject of the formula the equation above becomes strain= stress/ elastic modulus
Where strain= change in length/ length
And
Stress= force/ area
now let’s calculate value for stress
Stress= 35600/0.0001235=288,259,109 N/m^2
substituting the value for stress into the equation strain= stress/ elastic modulus we have
Strain= 288,259,109 / 69 x 〖10〗^9 = 〖4.1x10〗^(-3)
