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  A cross between 2 individuals analyses two different traits, and results in a ratio of 9:3:3:1. This is an example of a:

A person lifts an object of mass m from the bottom of a well at a constant speed of v for a time t. How much power P is exerted by the person on the object?

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？