挑战习题
1/5单选题
难度:

1.

一物体的质量是2kg,用手按在水中浸没时受到的浮力是40N,则物体密度是(  )


A

0.5×103千克/米3

B

0.75×103千克/米3

C

2×103千克/米3

D

1.5×103千克/米3

提示1:
PHA+5qC55o2uPGltZyBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwL0ZELzgzL3JCQUNGRk1KN0l6VEU1bHZBQUFEQWdOSlRQQTc4Ny5wbmciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvRkQvODMvckJBQ0ZGTUo3SXpURTVsdkFBQURBZ05KVFBBNzg3LnBuZyIgaGVpZ2h0PSI0MiIgd2lkdGg9IjUxIj7mib7liLDniankvZPph43lipvvvIzniankvZPmta7lipvlkozmtrLkvZPlr4bluqbjgII8L3A+
提示2:
PHA+6YeN5Yqb5pivMjBO77yM5rWu5Yqb5pivNDBO77yM5ray5L2T5piv5rC044CCPC9wPg==
提示3:
PHA+5Luj5YWl5YWs5byP5rGC6Kej44CCPC9wPg==
正确答案:QQ==
PGRpdj7moLnmja48c3BhbiBjbGFzcz0ibWF0aHF1aWxsLXJlbmRlcmVkLW1hdGgiIHN0eWxlPSJmb250LXNpemU6MjBweDsiPjxzcGFuIGNsYXNzPSJ0ZXh0YXJlYSI+PHRleHRhcmVhIGRhdGEtY2tlLWVkaXRhYmxlPSIxIiBjb250ZW50ZWRpdGFibGU9ImZhbHNlIj48L3RleHRhcmVhPjwvc3Bhbj48c3BhbiBjbGFzcz0iZnJhY3Rpb24gbm9uLWxlYWYiIG1hdGhxdWlsbC1jb21tYW5kLWlkPSI0Ij48c3BhbiBjbGFzcz0ibnVtZXJhdG9yIiBtYXRocXVpbGwtYmxvY2staWQ9IjUiPjx2YXIgbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjEzIj5GPC92YXI+PHN1YiBjbGFzcz0ibm9uLWxlYWYiIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIxMCIgbWF0aHF1aWxsLWJsb2NrLWlkPSIxMSI+PHNwYW4gbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjE2Ij7mta48L3NwYW4+PC9zdWI+PC9zcGFuPjxzcGFuIGNsYXNzPSJkZW5vbWluYXRvciIgbWF0aHF1aWxsLWJsb2NrLWlkPSI2Ij48dmFyIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIyNCI+RzwvdmFyPjxzdWIgY2xhc3M9Im5vbi1sZWFmIiBtYXRocXVpbGwtY29tbWFuZC1pZD0iMTkiIG1hdGhxdWlsbC1ibG9jay1pZD0iMjAiPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIyMyI+54mpPC9zcGFuPjwvc3ViPjwvc3Bhbj48c3BhbiBzdHlsZT0iZGlzcGxheTppbmxpbmUtYmxvY2s7d2lkdGg6MCI+Jm5ic3A7PC9zcGFuPjwvc3Bhbj48c3BhbiBjbGFzcz0iYmluYXJ5LW9wZXJhdG9yIiBtYXRocXVpbGwtY29tbWFuZC1pZD0iMjUiPj08L3NwYW4+PHNwYW4gY2xhc3M9ImZyYWN0aW9uIG5vbi1sZWFmIiBtYXRocXVpbGwtY29tbWFuZC1pZD0iMjYiPjxzcGFuIGNsYXNzPSJudW1lcmF0b3IiIG1hdGhxdWlsbC1ibG9jay1pZD0iMjciPjx2YXIgbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjM1Ij7PgTwvdmFyPjxzdWIgY2xhc3M9Im5vbi1sZWFmIiBtYXRocXVpbGwtY29tbWFuZC1pZD0iMzIiIG1hdGhxdWlsbC1ibG9jay1pZD0iMzMiPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIzOSI+5rayPC9zcGFuPjwvc3ViPjwvc3Bhbj48c3BhbiBjbGFzcz0iZGVub21pbmF0b3IiIG1hdGhxdWlsbC1ibG9jay1pZD0iMjgiPjx2YXIgbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjQ2Ij7PgTwvdmFyPjxzdWIgY2xhc3M9Im5vbi1sZWFmIiBtYXRocXVpbGwtY29tbWFuZC1pZD0iNDIiIG1hdGhxdWlsbC1ibG9jay1pZD0iNDMiPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSI0NSI+54mpPC9zcGFuPjwvc3ViPjwvc3Bhbj48c3BhbiBzdHlsZT0iZGlzcGxheTppbmxpbmUtYmxvY2s7d2lkdGg6MCI+Jm5ic3A7PC9zcGFuPjwvc3Bhbj48L3NwYW4+PHNwYW4+IDwvc3Bhbj7vvIzmta7lipvnrYnkuo40ME7vvIzniankvZPph43lipvnrYnkuo4yME7vvIzmiYDku6U8c3BhbiBjbGFzcz0ibWF0aHF1aWxsLXJlbmRlcmVkLW1hdGgiIHN0eWxlPSJmb250LXNpemU6MjBweDsiPjxzcGFuIGNsYXNzPSJ0ZXh0YXJlYSI+PHRleHRhcmVhIGRhdGEtY2tlLWVkaXRhYmxlPSIxIiBjb250ZW50ZWRpdGFibGU9ImZhbHNlIj48L3RleHRhcmVhPjwvc3Bhbj48c3BhbiBjbGFzcz0iZnJhY3Rpb24gbm9uLWxlYWYiIG1hdGhxdWlsbC1jb21tYW5kLWlkPSI0Ij48c3BhbiBjbGFzcz0ibnVtZXJhdG9yIiBtYXRocXVpbGwtYmxvY2staWQ9IjUiPjx2YXIgbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjEzIj5GPC92YXI+PHN1YiBjbGFzcz0ibm9uLWxlYWYiIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIxMCIgbWF0aHF1aWxsLWJsb2NrLWlkPSIxMSI+PHNwYW4gbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjE2Ij7mta48L3NwYW4+PC9zdWI+PC9zcGFuPjxzcGFuIGNsYXNzPSJkZW5vbWluYXRvciIgbWF0aHF1aWxsLWJsb2NrLWlkPSI2Ij48dmFyIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIyNCI+RzwvdmFyPjxzdWIgY2xhc3M9Im5vbi1sZWFmIiBtYXRocXVpbGwtY29tbWFuZC1pZD0iMTkiIG1hdGhxdWlsbC1ibG9jay1pZD0iMjAiPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIyMyI+54mpPC9zcGFuPjwvc3ViPjwvc3Bhbj48c3BhbiBzdHlsZT0iZGlzcGxheTppbmxpbmUtYmxvY2s7d2lkdGg6MCI+Jm5ic3A7PC9zcGFuPjwvc3Bhbj48c3BhbiBjbGFzcz0iYmluYXJ5LW9wZXJhdG9yIiBtYXRocXVpbGwtY29tbWFuZC1pZD0iMjUiPj08L3NwYW4+PHNwYW4gY2xhc3M9ImZyYWN0aW9uIG5vbi1sZWFmIiBtYXRocXVpbGwtY29tbWFuZC1pZD0iMjYiPjxzcGFuIGNsYXNzPSJudW1lcmF0b3IiIG1hdGhxdWlsbC1ibG9jay1pZD0iMjciPjx2YXIgbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjM1Ij7PgTwvdmFyPjxzdWIgY2xhc3M9Im5vbi1sZWFmIiBtYXRocXVpbGwtY29tbWFuZC1pZD0iMzIiIG1hdGhxdWlsbC1ibG9jay1pZD0iMzMiPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIzOSI+5rayPC9zcGFuPjwvc3ViPjwvc3Bhbj48c3BhbiBjbGFzcz0iZGVub21pbmF0b3IiIG1hdGhxdWlsbC1ibG9jay1pZD0iMjgiPjx2YXIgbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjQ2Ij7PgTwvdmFyPjxzdWIgY2xhc3M9Im5vbi1sZWFmIiBtYXRocXVpbGwtY29tbWFuZC1pZD0iNDIiIG1hdGhxdWlsbC1ibG9jay1pZD0iNDMiPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSI0NSI+54mpPC9zcGFuPjwvc3ViPjwvc3Bhbj48c3BhbiBzdHlsZT0iZGlzcGxheTppbmxpbmUtYmxvY2s7d2lkdGg6MCI+Jm5ic3A7PC9zcGFuPjwvc3Bhbj48c3BhbiBjbGFzcz0iYmluYXJ5LW9wZXJhdG9yIiBtYXRocXVpbGwtY29tbWFuZC1pZD0iNDgiPj08L3NwYW4+PHNwYW4gY2xhc3M9ImZyYWN0aW9uIG5vbi1sZWFmIiBtYXRocXVpbGwtY29tbWFuZC1pZD0iNDkiPjxzcGFuIGNsYXNzPSJudW1lcmF0b3IiIG1hdGhxdWlsbC1ibG9jay1pZD0iNTAiPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSI1MyI+NDwvc3Bhbj48c3BhbiBtYXRocXVpbGwtY29tbWFuZC1pZD0iNTQiPjA8L3NwYW4+PHZhciBtYXRocXVpbGwtY29tbWFuZC1pZD0iNTUiPk48L3Zhcj48L3NwYW4+PHNwYW4gY2xhc3M9ImRlbm9taW5hdG9yIiBtYXRocXVpbGwtYmxvY2staWQ9IjUxIj48c3BhbiBtYXRocXVpbGwtY29tbWFuZC1pZD0iNTYiPjI8L3NwYW4+PHNwYW4gbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjU3Ij4wPC9zcGFuPjx2YXIgbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjU4Ij5OPC92YXI+PC9zcGFuPjxzcGFuIHN0eWxlPSJkaXNwbGF5OmlubGluZS1ibG9jazt3aWR0aDowIj4mbmJzcDs8L3NwYW4+PC9zcGFuPjxzcGFuIGNsYXNzPSJiaW5hcnktb3BlcmF0b3IiIG1hdGhxdWlsbC1jb21tYW5kLWlkPSI1OSI+PTwvc3Bhbj48c3BhbiBtYXRocXVpbGwtY29tbWFuZC1pZD0iNjAiPjI8L3NwYW4+PC9zcGFuPjxzcGFuPiA8L3NwYW4+77yM5ray5L2T5a+G5bqm5piv54mp5L2T5a+G5bqm55qE5Lik5YCN77yM5omA5Lul54mp5L2T5a+G5bqm5pivPHNwYW4gY2xhc3M9Im1hdGhxdWlsbC1yZW5kZXJlZC1tYXRoIiBzdHlsZT0iZm9udC1zaXplOjIwcHg7Ij48c3BhbiBjbGFzcz0idGV4dGFyZWEiPjx0ZXh0YXJlYSBkYXRhLWNrZS1lZGl0YWJsZT0iMSIgY29udGVudGVkaXRhYmxlPSJmYWxzZSI+PC90ZXh0YXJlYT48L3NwYW4+PHNwYW4gbWF0aHF1aWxsLWNvbW1hbmQtaWQ9Ijc0Ij4wPC9zcGFuPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSI3NSI+Ljwvc3Bhbj48c3BhbiBtYXRocXVpbGwtY29tbWFuZC1pZD0iNzYiPjU8L3NwYW4+PHNwYW4gY2xhc3M9ImJpbmFyeS1vcGVyYXRvciIgbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjgyIj7Dlzwvc3Bhbj48c3BhbiBtYXRocXVpbGwtY29tbWFuZC1pZD0iOTIiPjE8L3NwYW4+PHNwYW4gbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjkzIj4wPC9zcGFuPjxzdXAgY2xhc3M9Im5vbi1sZWFmIiBtYXRocXVpbGwtY29tbWFuZC1pZD0iODkiIG1hdGhxdWlsbC1ibG9jay1pZD0iOTAiPjxzcGFuIG1hdGhxdWlsbC1jb21tYW5kLWlkPSI5NCI+Mzwvc3Bhbj48L3N1cD48dmFyIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIxMDUiPms8L3Zhcj48dmFyIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIxMDYiPmc8L3Zhcj48c3BhbiBtYXRocXVpbGwtY29tbWFuZC1pZD0iMTE4Ij4vPC9zcGFuPjxzdWIgY2xhc3M9Im5vbi1sZWFmIiBtYXRocXVpbGwtY29tbWFuZC1pZD0iMTIwIiBtYXRocXVpbGwtYmxvY2staWQ9IjEyMSI+PHZhciBtYXRocXVpbGwtY29tbWFuZC1pZD0iMTI4Ij5tPC92YXI+PHN1cCBjbGFzcz0ibm9uLWxlYWYiIG1hdGhxdWlsbC1jb21tYW5kLWlkPSIxMjUiIG1hdGhxdWlsbC1ibG9jay1pZD0iMTI2Ij48c3BhbiBtYXRocXVpbGwtY29tbWFuZC1pZD0iMTI5Ij4zPC9zcGFuPjwvc3VwPjwvc3ViPjwvc3Bhbj48c3Bhbj4gPC9zcGFuPi48L2Rpdj4=