Exercice 20 : Un ballon sous l'eau. Anne s'amuse à maintenir un ballon sous l'eau pour le relâcher et le voir jaillir hors
de l'eau. On s'intéresse aux forces qui s'exercent sur le ballon juste avant qu'Anne
ne le relâche. La force d'attraction de la Terre sur le ballon est de 4,4 N et Anne
exerce une force de 52 N pour maintenir le ballon vers le bas. L'eau exerce une force
de poussée sur le ballon. Cette force, appelée poussée d'Archimède, est celle qui
permet au ballon de flotter.

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Which statement best describes the direction of the buoyant force on any object? a. opposite the force of gravity b. in the same direction as the weight c. in the direction of motion of the object d. opposite the direction of motion of the object

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 740 n/m. it is initially at rest on an inclined plane that is at an angle of theta= 26 with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is uk = 0.17. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. the block's initial mechanical energy is 9.472 j.b. if the spring pushes the block up the incline, what distance l in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.