Une chanteuse d'opéra soprano peut atteindre la note la4 de fréquence 880 Hz, un chanteur basse peut chan-
ter la note do2 de fréquence 132 Hz.
Lequel des deux chanteurs chante la note la plus aiguë ?
Justifier votre réponse.

When a bicycle coasts uphill, it moves slower and slower as it climbs. why? a. its kinetic energy is transforming into heat energy. b. its potential energy is transforming into kinetic energy. c. its kinetic energy is transforming into potential energy and heat energy. d. its potential energy is transforming into kinetic energy and heat energy.

14. a body is projected with velocity vi from a. at the same time another body is projectedvertically upwards from point b withvelocity v2 lies vertically below the highestpoint. both the bodies collide thenv2÷v1is

Which best term to describe a chemical reaction that absorbs energy from its surroundings? a. thermal conductor b. thermal insulator c. endothermic d. exothermic