Electrons are very emotional and compulsive things. They feel

an intense desire to get away from negatively charged things or

places, and an equally strong desire to get closer to positively

charged ones, as if according to some law of nature.

By means of chemical things inside batteries that I don't understand,

one end of the battery is kept positively charged and the other one

negatively charged. So if there's anything between the terminals that

an electron can easily flow through, they'll do it !

**Answer:**

A) A circle starting at time t=0 on the positive x axis
.

B) .

C) **v**(t)=Rω[-sin(ωt)i^+cos(ωt)j^]

D) v(t)=Rω

E) **a**(t)=-R[cos(ωt)i^+sin(ωt)j^]

F) **a**(t)=-**r**(t)

G) (There is no Part G)

H) a=/R

**Explanation:**

The particle's motion is a circle starting at t=0 on the positive x axis since **r**(0)=R[cos(0)i^+sin(0)j^]=R[i^]. The particle first cross the negative x axis when **r**(t)=-R[i^], which means cos(ωt)=-1, or , so we have . The particle's velocity is the derivative of its position, so **v**(t)=Rω[-sin(ωt)i^+cos(ωt)j^], while its speed is the magnitude of that vector, v(t)=Rω (since the magnitude of the vector -sin(ωt)i^+cos(ωt)j^ is 1). The particle's acceleration is the derivative of its velocity, so **a**(t)=-R[cos(ωt)i^+sin(ωt)j^], or in terms of its position **a**(t)=-**r**(t), and its magnitude using the expression obtained for the speed of the particle, a=R=R/=/R.

Her potential energy is 11.25 kj

**Answer: Streptococcus. **

**Explanation:**

**The Bacteria and Archaea domains are prokaryotes, they contain no nuclues or organelles, only a circular chromosome. They cannot form multicells organisms. Archaea can be found in extreme evironments, such as hot springs and deep sea vents.**