Zone d’entraide

AdorableApatosaurus7671

Hello, I have a few questions before tomorrow’s exam. I saw these three examples in the guide provided by the government. I’m not sure if I can get an answer for them. First when we calculate electrical power, are we gonna use this 60Hz? For the second question, is the answer ‘D’ cuz that’s the only system who will mesh together… For the third question, I actually don’t really understand how can this be reversible.

Ce contenu est protégé par le droit d'auteur. Toute reproduction à l'extérieur des forums Alloprof est interdite et pourra être considérée comme une violation du droit d'auteur.

Ce contenu est protégé par le droit d'auteur. Toute reproduction à l'extérieur des forums Alloprof est interdite et pourra être considérée comme une violation du droit d'auteur.

Ce contenu est protégé par le droit d'auteur. Toute reproduction à l'extérieur des forums Alloprof est interdite et pourra être considérée comme une violation du droit d'auteur.

Ariane P

Hi there!

Thanks for checking in :)

For the first number, as you said, you wouldn't have to use 60Hz, because the formula is:

P = U x I

For your second number, as you said, D wouldn't be able to slip, but B would also be a good choice, since the chain and gear would be pretty much locked together if the chain is tense enough.

For the third number, since the crank would have to be activated by a human force, as you can see, you could turn one way or another; that's why it could be reversible!

To have some more information on basic and complex mechanical functions, follow the link:

https://www.alloprof.qc.ca/en/students/vl/sciences/basic-and-complex-mechanical-functions-s1448

Hope that helped!

Have a great day :)

Ariane