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A pendulum consists of a mass of 10 kg attached to a rigid massless rod of length 2m. If the mass is doubled to 20 kg, what happens to the period of the pendulum?  

Two coins are on a turntable spinning counterclockwise. Neither coins are slipping with respect to the turntable. How do their angular velocity and linear velocity compares?

An object of mass 1 kg that is moving along the x axis experiences a net force as indicated in the graph. When located at x = 0, the object has a kinetic energy of 1000 J and is moving in the +x direction. What is the kinetic energy of the object when it reaches x = 10 m?

A stone is tied to a string and whirled at constant speed in a horizontal circle. The speed is then doubled without changing the length of the string. Afterward the magnitude of the acceleration of the stone is:

An object is in a region such that its system’s potential energy as a function of position is as graphed below. What is the y component of the conservative force associated with the potential energy at y = 18 m?

Translate the following sentences into English.   1.  我的哥哥喜欢绿色。 wǒ de gē ge xǐ huān lǜ sè . 2.  爷爷没有狗。yé ye méi yǒu gǒu . 3.  他会说中文。tā huì shuō zhōng wén .    

Rearrange the words/phrases into sentences. 1. 什么(shén me)   2.你   3.名字？(míng zi)  4.叫(jiào)  

Rearrange the words/phrases into sentences. 1. 家 2.有   3.你  4.口  5.几  6. 人？  

Which of the following are the two models used to explain the fossil record of morphological change through time?

Acritarchs are microfossils of green microalgae thereby providing fossil evidence that eukaryotes originated by a least 2.0 Ga.