Physics, 12.11.2020 01:50 stinematesa
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.
Answers: 3
Physics, 21.06.2019 23:30
A175 g lump of molten lead at its melting point (327 c) is placed into 55.0 g of water at 20.0 c. the specific heat of lead is 130.j/kg c and the hf of lead is 20,400 j/kg. when the lead and the water have reached equilibrium, what is the temperature of the mixture?
Answers: 3
Physics, 22.06.2019 04:50
Unpolarized light whose intensity is 1.19 w/ is incident on a polarizer. (a) what is the intensity of the light leaving the polarizer? (b) if the analyzer is set at an angle of = 41.0∘ with respect to the polarizer, what is the intensity of the light that reaches the photocell?
Answers: 1
Physics, 22.06.2019 06:00
Juan created a chart to him study for a test. which headings best complete the chart? x: transparent objects y: opaque objects x: opaque objects y: transparent objects x: high frequency waves y: low frequency waves x: low frequency waves y: high frequency waves
Answers: 3
Physics, 22.06.2019 07:00
Which statement is best supported by the information in the chart? wave y is moving the fastest. wave x is moving the fastest. all of the waves are moving at the same speed. all of the waves have the same value of wavelengths per second.
Answers: 3
Exercice 20 : Un ballon sous l'eau.
Anne s'amuse à maintenir un ballon sous l'eau pour le relâcher...
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