这个要用到曲线积分吧.
曲线为x=acost,y=asint,z=kt
S=∫ds 积分区间0到θ,
再化成对t的积分
S=√(a^2+k^2)*θ
猜你喜欢
- 1操场太小了,不能踢足球.(改为夸张句)
- 2普通花生榨油率38%,国家研制了“太空一号”花生,比普通花生的榨油率还高约20%,请大家告诉我太空一号花生榨油率多少
- 3“它是爸爸妈妈给我的生日礼物”用英语翻译
- 4某储户存入银行甲,乙两种利息的存款共5万元,甲种存款的年利率为2.8%,乙种存款的年利率为1.6%
- 5烧开水冒出的白气是水蒸气吗?为什么?
- 6-(26.54)+(-6.4)-18.54+6.4
- 7有趣的英语,快乐的童年.用英语咋么写
- 8An indirect object refers to a person or a group of people that the action of the verb is done to or for.
- 9珠穆朗玛峰的英文怎么说?
- 10There are only five boys here.We need _____ for a 3-on-3(三对三的)basketball match.