本课配套习题挑战模式1/5
如图所示,是我国生产的“歼10”战斗机的雄姿,战斗机在减速下降的过程中( )
A: 动能减小,重力势能增大 |
B: 动能减小,重力势能减小 |
C: 动能增大,重力势能增大 |
D: 动能不变,重力势能不变 |
- 提示1:PHA+5Yqo6IO955qE5aSn5bCP5LiO54mp5L2T55qE6LSo6YeP5ZKM6YCf5bqm5pyJ5YWz77yM6LSo6YeP6LaK5aSn77yM6YCf5bqm6LaK5aSn77yM5Yqo6IO96LaK5aSn77yMPC9wPg==
- 答案:Qg==
PHA+5oiY5paX5py66LSo6YeP5LiN5Y+Y77yM5YeP6YCf6aOe6KGM5pe277yM5Yqo6IO95YeP5bCP77yb6YeN5Yqb5Yq/6IO95LiO54mp5L2T55qE6LSo6YeP5ZKM6auY5bqm5pyJ5YWz77yM6LSo6YeP6LaK5aSn77yM5L2N572u6LaK6auY77yM6YeN5Yqb5Yq/6IO96LaK5aSn77yM5oiY5paX5py66auY5bqm5LiL6ZmN77yM5omA5Lul6YeN5Yqb5Yq/6IO95YeP5bCP44CCPC9wPg==
本课配套习题挑战模式2/5
如图,“套圈”出手后,从a点到c点的过程中(不计空气阻力),下列说法正确的是
A: “套圈”由a到b过程中,动能逐渐增大 |
B: “套圈”在b点的机械能大于a点的机械能 |
C: “套圈”由b到c过程中,机械能逐渐变小 |
D: “套圈”由a到b再到c过程中,重力势能先变大后变小 |
- 提示1:PHA+4oCc5aWX5ZyI4oCd5Zyo5LuOYeeCueWIsGPngrnnmoTov4fnqIvmmK/liqjog73lkozlir/og73nmoTovazljJbov4fnqIvvvIzlpoLmnpzkuI3orqHnqbrmsJTpmLvlipvvvIzmnLrmorDog73nmoTmgLvph4/lsIbkv53mjIHkuI3lj5jjgII8L3A+
- 答案:RA==
PHA+5LuOYeWIsGLov4fnqIvkuK3vvIzlpZflnIjlkJHkuIrljYfvvIzph43lipvlir/og73lop7lpKfvvIzliqjog73lh4/lsI/vvIzliqjog73ovazljJbkuLrph43lipvlir/og73vvJvku45i5YiwY+i/h+eoi+S4re+8jOS9jee9ruS4i+mZje+8jOmHjeWKm+WKv+iDveWHj+Wwj++8jOaKiumHjeWKm+WKv+iDvei9rOWMluS4uuWKqOiDveOAguS7jmHliLBj6L+H56iL5Lit77yM4oCc5aWX5ZyI4oCd5L2N572u5YWI5LiK5Y2H5ZCO5LiL6ZmN77yM6YeN5Yqb5Yq/6IO95YWI5Y+Y5aSn5ZCO5Y+Y5bCP44CC5omA5Lul6YCJRO+8jjwvcD4=
本课配套习题挑战模式3/5
下列说法中正确的是( )
A: 汽车匀速下坡,机械能不变 |
B: 人造地球卫星在大气层外绕地球运转时,机械能不变 |
C: 物体的温度越高,所含热量越多 |
D: 一块0℃的冰块化成0℃的水,内能不变 |
- 提示1:PHA+5rG96L2m5YyA6YCf5LiL5Z2h55qE6L+H56iL5Lit6LSo6YeP5LiN5Y+Y77yM5L2G5piv6auY5bqm6ZmN5L2O77yM5omA5Lul5Yqo6IO95LiN5Y+Y77yM6YeN5Yqb5Yq/6IO95YeP5bCR77yM5py65qKw6IO9PemHjeWKm+WKv+iDvSvliqjog73vvIzmlYXmnLrmorDog73nmoTmgLvph4/mmK/lh4/lsJHnmoTjgII8L3A+
- 答案:Qg==
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
本课配套习题挑战模式4/5
“5•12”汶川大地震发生后,直升飞机满载着各种救灾物资飞临灾区上空,投下物资后,飞机仍以原来的高度和速度匀速飞行.则与投下物资之前相比,飞机的( )
A: 动能增加,机械能不变 |
B: 动能减少,机械能减少 |
C: 动能不变,机械能不变 |
D: 动能不变,机械能增加 |
- 提示1:PHA+55u05Y2H6aOe5py65ruh6L29552A5ZCE56eN5pWR54G+54mp6LWE6aOe5Li054G+5Yy65LiK56m677yM5oqV5LiL54mp6LWE5ZCO77yM6aOe5py65LuN5Lul5Y6f5p2l55qE6auY5bqm5ZKM6YCf5bqm5YyA6YCf6aOe6KGM77yM6aOe5py655qE6LSo6YeP5YeP5bCP77yM6YCf5bqm5LiN5Y+Y77yM5Yqo6IO95YeP5bCP44CCPC9wPg==
- 答案:Qg==
PHA+6LSo6YeP5YeP5bCP77yM6auY5bqm5LiN5Y+Y77yM6YeN5Yqb5Yq/6IO95YeP5bCP77yb6aOe5py66aOe6KGM5pe25rKh5pyJ5Y+R55Sf5by55oCn5b2i5Y+Y77yM5LiN5YW35pyJ5by55oCn5Yq/6IO977yb5py65qKw6IO9PeWKqOiDvSvph43lipvlir/og73vvIzliqjog73lh4/lsI/vvIzph43lipvlir/og73lh4/lsI/vvIzmnLrmorDog73lh4/lsI/vvI48L3A+
本课配套习题挑战模式5/5
2014年1月25日,中国网球选手李娜以7战7胜的战绩夺得澳网女单冠军。比赛过程中,当网球离开球拍斜向上飞时,网球的()
A: 动能转化为重力势能,机械能减小 |
B: 重力势能转化为动能,机械能减小 |
C: 动能转化为重力势能,机械能不变 |
D: 重力势能转化为动能,机械能不变 |
- 提示1:PHA+55CD5pac5ZCR5LiK6aOe5pe277yM6YCf5bqm5YeP5bCP77yM5omA5Lul5Yqo6IO95YeP5bCPPC9wPg==
- 答案:QQ==
PHA+55CD5pac5ZCR5LiK6aOe5pe277yM6auY5bqm5aKe5Yqg77yM5omA5Lul6YeN5Yqb5Yq/6IO95aKe5aSn77yM5YiZ5Yqo6IO96L2s5YyW5oiQ6YeN5Yqb5Yq/6IO977yM55Sx5LqO55CD5Y+X5Yiw56m65rCU6Zi75Yqb77yM5omA5Lul5py65qKw6IO95YeP5bCP44CCPC9wPg==