向心力

wàn yǒu yǐn lì hé xiàng xīn lì zài xíng xīng gōng zhuàn hé zì zhuàn zhōng de zuò yòng jī zhì

万有引力和向心力在行星公转和自转中的作用机制

action mechanism of gravitation and centripetal force on revolution and rotation of planets

rú guǒ bàn jìng bù biàn sù dù zēng dà yī bèi zé xiàng xīn lì zēng dà wéi yuán lái de sì bèi

如果半径不变，速度增大一倍，则向心力增大为原来的四倍。

If the speed is doubled, keeping the radius constant, the centripetal force becomes four times as great.

shēng de mù biāo shì níng jù xiàng xīn lì bì bèi de tiáo jiàn

“生的目标”是凝聚向心力必备的条件。

Prerequisite of cohesive force is the goal of life.