1/5单选题
难度：
1.
用弹簧测力计测出一个物体重为4N，然后将该物体浸没在水中，这时弹簧测力计的示数变为3N，则该物体在水中受到的浮力是（ ）
| A | 7N |
| B | 4N |
| C | 3N |
| D | 1N |
- 提示1：
- PHA+54mp5L2T5Y+X5Yiw55qE5rWu5Yqb562J5LqO6YeN5Yqb5YeP5Y675ZCR5LiK55qE5ouJ5YqbPC9wPg==
正确答案：RA==
PHA+5bey55+lRz00Tu+8jEbigLI9M07vvIzliJk8YnI+6K+l54mp5L2T5Zyo5rC05Lit5Y+X5Yiw55qE5rWu5YqbRjxzdWI+5rWuPC9zdWI+PUctRuKAsj00Ti0zTj0xTi48YnI+5pWF6YCJRC48L3A+
2/5单选题
难度：
2.铁块在弹簧测力计上，当铁块全部浸没在水中时，弹簧测力计的示数是表示（ ）
| A | 铁块的质量 |
| B | 铁块所受的浮力 |
| C | 铁块所受的重力与浮力之差 |
| D | 铁块所受的重力 |
- 提示1：
- IOa1uOayoeWcqOawtOS4reeahOaXtuWAmeeJqeS9k+WPl+WIsOS4ieS4quWKmw==
- 提示2：
- IOmHjeWKm+aWueWQkeerluebtOWQkeS4iw==
- 提示3：
- IOa1ruWKm+WSjOaLieWKm+aWueWQkeerluebtOWQkeS4ig==
正确答案：Qw==
5rW45rKh5Zyo5rC05Lit55qE6ZOB5Z2X5Y+X5Yiw56uW55u05ZCR5LiL55qE6YeN5Yqb44CB56uW55u05ZCR5LiK55qE5rWu5Yqb5Lul5Y+K56uW55u05ZCR5LiK55qE5by557Cn5rWL5Yqb6K6h55qE5ouJ5Yqb77yM5qC55o2u5Yqb55qE5ZCI5oiQ55qE55+l6K+G5Y+v55+l77ya6YeN5YqbPea1ruWKmyvmi4nlipvvvIzlm6DmraTlvLnnsKfmtYvlipvorqHnmoTnpLrmlbDnrYnkuo7pk4HlnZfmiYDlj5fnmoTph43lipvkuI7mta7lipvkuYvlt64uIDxicj7mlYXpgIlDLiA=
3/5单选题
难度：
3.弹簧测力计下挂一个重为29.4N的物体，把它浸没在水中时，测力计示数为19.6N，物体受到的浮力是（ ）
| A | 29.4N |
| B | 19.6N |
| C | 9.8N |
| D | 49N |
- 提示1：
- IOeJqeS9k+WPl+WIsOeahOa1ruWKm+etieS6jumHjeWKm+WHj+WOu+WQkeS4iueahOaLieWKmw==
正确答案：Qw==
54mp5L2T5Y+X5Yiw55qE5rWu5Yqb77yaRjxzdWI+5rWuPC9zdWI+PTI5LjROLTE5LjZOPTkuOE7vvJs8YnI+5pWF6YCJQy4g
4/5单选题
难度：
4.如图所示，金属块挂在弹簧测力计下，将金属块慢慢放入水中，弹簧测力计的示数逐渐减小，如图是弹簧测力计示数与金属块下降距离的图象. 当金属块完全浸没在水中时受到的浮力为（ ）
| A | 5N |
| B | 3N |
| C | 2N |
| D | 1N |
- 提示1：
- IOW8ueewp+a1i+WKm+iuoeekuuaVsOacgOWwj+eahOaXtuWAmea1ruWKm+acgOWkpw==
- 提示2：
- IOa1uOayoeS7peWQjuW8ueewp+a1i+WKm+iuoeekuuaVsOS4jeWPmA==
- 提示3：
- IOa1ruWKm+etieS6jumHjeWKm+WHj+WOu+a1uOayoeWQjueahOaLieWKmw==
正确答案：Qw==
55Sx5Zu+5Y+v55+l77yM6YeR5bGe5Z2X6YeNRz01Tu+8jOWFqOa1uOWFpeawtOS4reW8ueewp+a1i+WKm+iuoeeahOekuuaVsEY8c3ViPuekujwvc3ViPj0zTu+8jDxicj7lvZPph5HlsZ7lnZflhajmtbjlhaXml7bvvJo8YnI+RjxzdWI+5rWuPC9zdWI+PUctRjxzdWI+56S6PC9zdWI+PTVOLTNOPTJOLiA8YnI+5pWF6YCJQy4g
5/5单选题
难度：
5.
一个体积为V重为G的金属圆柱体挂在弹簧测力计上（圆柱体底面与水面平行），手提弹簧测力计使圆柱体浸入水中处于静止状态，如图所示. 圆柱体上底面受到水向下的压力为F1，圆柱体下底面受到水向上的压力为F2，圆柱体受到的浮力为F浮，测力计的示数为T，则下列表达式正确的是（ ）
| A | T+F2=G+F1 |
| B | F1-F2=ρ水gV |
| C | F2+F1=ρ水gV |
| D | F2=G+F1 |
- 提示1：
- PHA+5YWI55So5Y6L5Yqb5beu5rOV5rGC5Ye654mp5L2T5rWu5YqbPC9wPg==
- 提示2：
- PHA+6YCa6L+H56ew6YeN5rOV6KGo56S65Ye65ZCE5Liq5Yqb5LmL6Ze055qE5YWz57O7PC9wPg==
- 提示3：
- PHA+55SoRjxzdWI+5rWuPC9zdWI+Pc+BPHN1Yj7msLQ8L3N1Yj5nVjxzdWI+5o6SPC9zdWI+5Luj5YWl5byP5a2QPC9wPg==
正确答案：Qw==
PHA+6YeR5bGe5ZyG5p+x5L2T5Y+X5Yqb5aaC5Zu+5LiA5omA56S677yM5Zyo6YeN5YqbR++8jOaLieWKm1TvvIzmta7liptGPHN1Yj7mta48L3N1Yj7kvZznlKjkuIvph5HlsZ7lnIbmn7HkvZPlpITkuo7lubPooaHnirbmgIHvvIw8YnI+55Sx5bmz6KGh5p2h5Lu25b6X77yaVCtGPHN1Yj7mta48L3N1Yj49R+KRoDxicj7ph5HlsZ7lnIbmn7HkvZPlj5fliLDnmoTmta7liptGPHN1Yj7mta48L3N1Yj49z4E8c3ViPuawtDwvc3ViPmdWPGJyPuiuvumHkeWxnuWchuafseS9k+W6lemdouenr+S4ulPvvIzpq5jkuLpo77yM5LiK5LiL5bqV6Z2i6Led5rC06Z2i55qE6Led56a75YiG5Yir5Li6aDxzdWI+MTwvc3ViPuOAgWg8c3ViPjI8L3N1Yj7vvIzlpoLlm77kuozmiYDnpLouPGJyPuWchuafseS9k+S4iuW6lemdouWPl+WIsOawtOWQkeS4i+eahOWOi+WKm0Y8c3ViPjE8L3N1Yj49UDxzdWI+MTwvc3ViPlM9z4E8c3ViPuawtDwvc3ViPmdoPHN1Yj4xPC9zdWI+U++8jDxicj7kuIvlupXpnaLlj5fliLDmsLTlkJHkuIrnmoTljovliptGPHN1Yj4yPC9zdWI+PVA8c3ViPjI8L3N1Yj5TPc+BPHN1Yj7msLQ8L3N1Yj5naDxzdWI+Mjwvc3ViPlPvvIw8YnI+RjxzdWI+Mjwvc3ViPi1GPHN1Yj4xPC9zdWI+Pc+BPHN1Yj7msLQ8L3N1Yj5naDxzdWI+Mjwvc3ViPlMtz4E8c3ViPuawtDwvc3ViPmdoPHN1Yj4yPC9zdWI+Uz3PgTxzdWI+5rC0PC9zdWI+Z2hTPc+BPHN1Yj7msLQ8L3N1Yj5nVj1GPHN1Yj7mta48L3N1Yj4uPGJyPuWNs0Y8c3ViPjI8L3N1Yj4tRjxzdWI+MTwvc3ViPj1GPHN1Yj7mta48L3N1Yj49z4E8c3ViPuawtDwvc3ViPmdWIOKRoTxicj7miorikaHku6PlhaXikaDlvpdUK0Y8c3ViPjI8L3N1Yj4tRjxzdWI+MTwvc3ViPj1H77yMVCtGPHN1Yj4yPC9zdWI+PUcrRjxzdWI+MTwvc3ViPiDikaI8YnI+55Sx4pGg4pGh4pGi55+lQUPmraPnoa4uPGJyPuaVhemAiUEuIDxpbWcgZGF0YS1ja2Utc2F2ZWQtc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8xMC8yOC9yQkFDRkZOMXMxdXpNalk0QUFBMEc1T3plRU02ODEucG5nIiBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzEwLzI4L3JCQUNGRk4xczF1ek1qWTRBQUEwRzVPemVFTTY4MS5wbmciIHdpZHRoPSIyNTYiIGhlaWdodD0iMjQ2Ij48YnI+PC9wPg==