Quiz — 18.4 - Action de l’eau sur la porte d’une écluse.pdf

Question 1 sur 10 20:00

[{"id":58546,"question":"Quelle est l'unité de mesure de la pression dans le système international ?","option_a":"Newton (N)","option_b":"Pascal (Pa)","option_c":"Joule (J)","option_d":"Watt (W)","option_e":"","option_f":"","bonne_reponse":"b","explication":"La pression s'exprime en Pascal (Pa), équivalent à 1 Newton par mètre carré (N\/m²).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Newton (N)\", \"b\": \"Pascal (Pa)\", \"c\": \"Joule (J)\", \"d\": \"Watt (W)","_debug_options_count":4},{"id":58547,"question":"La pression hydrostatique dépend-elle de la forme du récipient ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La pression hydrostatique ne dépend que de la hauteur d'eau et de la masse volumique du fluide, pas de la forme du récipient.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":58548,"question":"Quel est le principe de Pascal ?","option_a":"La pression est la même en tout point d'un fluide incompressible en équilibre.","option_b":"La pression diminue avec la profondeur.","option_c":"La pression est proportionnelle au volume du fluide.","option_d":"La pression dépend uniquement de la température.","option_e":"","option_f":"","bonne_reponse":"a","explication":"Le principe de Pascal stipule que toute variation de pression en un point d'un fluide incompressible se transmet intégralement dans tout le fluide.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"La pression est la même en tout point d'un fluide incompressible","_debug_options_count":4},{"id":58549,"question":"Pour une porte d'écluse de 2 m de large et 3 m de haut, immergée jusqu'à 2 m, quelle est la pression au fond de la porte ? (ρ_eau = 1000 kg\/m³, g = 9,81 N\/kg)","option_a":"19 620 Pa","option_b":"9 810 Pa","option_c":"29 430 Pa","option_d":"39 240 Pa","option_e":"","option_f":"","bonne_reponse":"a","explication":"La pression au fond est P = ρgh = 1000 × 9,81 × 2 = 19 620 Pa.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"19 620 Pa\", \"b\": \"9 810 Pa\", \"c\": \"29 430 Pa\", \"d\": \"39 240 Pa\"}}","_debug_options_count":4},{"id":58550,"question":"La force exercée par l'eau sur la porte d'une écluse est toujours verticale.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La force est perpendiculaire à la surface de la porte, donc horizontale si la porte est verticale.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":58551,"question":"Quelle formule permet de calculer la force résultante exercée par un fluide sur une surface plane ?","option_a":"F = P × S","option_b":"F = ρ × g × h","option_c":"F = m × a","option_d":"F = P × V","option_e":"","option_f":"","bonne_reponse":"a","explication":"La force résultante est le produit de la pression moyenne (P) par la surface (S) : F = P × S.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"F = P × S\", \"b\": \"F = ρ × g × h\", \"c\": \"F = m × a\", \"d\": \"F ","_debug_options_count":4},{"id":58552,"question":"Si la hauteur d'eau augmente, la force exercée sur la porte :","option_a":"Diminue","option_b":"Reste constante","option_c":"Augmente","option_d":"Devient nulle","option_e":"","option_f":"","bonne_reponse":"c","explication":"La force augmente car la pression hydrostatique et la surface immergée augmentent avec la hauteur d'eau.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"Diminue\", \"b\": \"Reste constante\", \"c\": \"Augmente\", \"d\": \"Devient ","_debug_options_count":4},{"id":58553,"question":"La pression atmosphérique a-t-elle un effet sur la force exercée par l'eau sur la porte ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Oui, car la pression totale inclut la pression atmosphérique (P = P_atm + ρgh).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":58554,"question":"Quel est l'ordre de grandeur de la pression exercée par l'eau à 10 m de profondeur ?","option_a":"10 000 Pa","option_b":"100 000 Pa","option_c":"1 000 000 Pa","option_d":"10 000 000 Pa","option_e":"","option_f":"","bonne_reponse":"b","explication":"P = ρgh = 1000 × 9,81 × 10 ≈ 100 000 Pa (1 bar).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"10 000 Pa\", \"b\": \"100 000 Pa\", \"c\": \"1 000 000 Pa\", \"d\": \"10 000 ","_debug_options_count":4},{"id":58555,"question":"Pour équilibrer la porte d'une écluse, la force exercée par l'eau doit être compensée par :","option_a":"Le poids de la porte","option_b":"La réaction du mécanisme d'ouverture","option_c":"La poussée d'Archimède","option_d":"La tension des câbles","option_e":"","option_f":"","bonne_reponse":"b","explication":"La porte est équilibrée lorsque la force exercée par l'eau est compensée par la réaction du mécanisme (ou des contrepoids).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Le poids de la porte\", \"b\": \"La réaction du mécanisme d'ouvertu","_debug_options_count":4}]