本课配套习题挑战模式1/5
中考体育跳绳项目测试中,李明同学在1min内跳了120次,则他跳绳时的功率大约是
()
A: 0.5W |
B: 5W |
C: 50W |
D: 500W |
- 提示1:PHA+6aaW5YWI6KaB5Lyw566X5LiA5LiL5bCP5piO55qE6YeN5YqbPC9wPg==
- 提示2:PHA+6L+Y6KaB5Lyw566X6Lez57uz55qE6auY5bqmPC9wPg==
- 答案:Qw==
PHA+5p2O5piO5ZCM5a2m5ZyoMW1pbuWGhei3s+S6hjEyMOasoe+8jOWImeS7lui3s+e7s+aXtueahOWKn+eOh+Wkp+e6plA9Vy90PTUwME54MC4xbXgxMjAvNjBzPTEwMFcs5omA5Lul6YCJQ+OAgjwvcD4=
本课配套习题挑战模式2/5
下列物理量中,以科学家瓦特的名字作为单位的物理量是()
A: 质量 |
B: 密度 |
C: 压强 |
D: 功率 |
- 提示1:PHA+5Yqf546H55qE5Y2V5L2N5piv55Om54m5566A56ew55OmPGJyPjwvcD4=
- 答案:RA==
PHA+5Zyo5Zu96ZmF5Y2V5L2N5Yi25Lit77ya6LSo6YeP55qE5Y2V5L2N5piva2fvvJvlr4bluqbnmoTljZXkvY3mmK9rZy9tM++8m+WOi+W8uueahOWNleS9jeaYr1Bh77yb5Yqf546H55qE5Y2V5L2N5pivV++8juaJgOS7pemAiUTvvI48YnI+PC9wPg==
本课配套习题挑战模式3/5
要测出小明同学做“引体向上”时的功率。下面所列的物理量中,不需要测量的是( )
A: 他的质量 |
B: 单杠的高度 |
C: 每次身体上升的高度 |
D: 做“引体向上”的时间 |
- 提示1:PHA+cD13L3Q9bWdoL3Q8YnI+PC9wPg==
- 提示2:PHA+5qC55o2u5YWs5byP6ZyA6KaB5rWL5Ye66LSo6YeP77yM6auY5bqm5ZKM5pe26Ze0PGJyPjwvcD4=
- 答案:Qg==
PHA+cD13L3Q9bWdoL3TvvIzlgZrlvJXkvZPlkJHkuIrnmoTlip/njofpnIDopoHmtYvph4/nmoTniannkIbph4/mmK/lsI/mmI7nmoTotKjph4/jgIHouqvkvZPkuIrljYfnmoTpq5jluqbjgIHlsI/mmI7lgZrlvJXkvZPlkJHkuIrnmoTml7bpl7TvvI7mlYXpgIlC77yOPGJyPjwvcD4=
本课配套习题挑战模式4/5
下列说法中正确的是 ()
A: 做功快的机械,其功率不一定大 |
B: 做匀速直线运动的物体的机械能不一定保持不变 |
C: 踢出去的足球还能在水平地面上继续运动,此时足球重力对足球做功 |
D: 质量相同的物体,放得高度越高,其具有的重力势能越大 |
- 提示1:PHA+5Yqf546H5piv6KGo56S65YGa5Yqf5b+r5oWi55qE54mp55CG6YePPC9wPg==
- 答案:QixE
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
本课配套习题挑战模式5/5
如图所示,是甲乙两物体做功和所需时间的关系图象,由图可知()
A: P甲>P乙 |
B: P甲<P乙 |
C: P甲=P乙 |
D: 无法确定 |
- 提示1:PHA+5q+U6L6D5Yqf546H55qE5aSn5bCP77yM5Y+v5Lul6YCJ5oup5Yqf55u4562J77yM5q+U6L6D5pe26Ze077yb5Lmf5Y+v5Lul5Zyo5pe26Ze055u45ZCM55qE5oOF5Ya15LiL5q+U6L6D5YGa5Yqf55qE5aSa5bCRPC9wPg==
- 答案:QQ==
PHA+5aaC5Zu+5omA56S677yM5Y+W55u45ZCM5pe26Ze05q+U6L6D55Sy44CB5LmZ5Lik54mp5L2T5YGa5Yqf55qE5aSa5bCR77yM5LuO5Zu+5Lit5Y+v5Lul55yL5Ye677yM55Sy5YGa55qE5Yqf5q+U5LmZ5aSa77yM5Y2z55Sy55qE5Yqf546H5q+U5LmZ55qE5Yqf546H5aSn77yM5omA5LulUOeUsu+8nlDkuZnvvI7mlYXpgIlB44CCPC9wPg==