What is the number n of the highest harmonic that could be heard by a person who is capable of hearing frequencies up to f

Ineed extreme for task 2. my student number is 571721. many to whoever solves this correctly, im in debt to you.

1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?

Why do astronauts in the space shuttle weigh less?