Write a ½- to 1-page paper (about 300 words) describing how pregnancy happens. Include how a couple could avoid pregnancy if they were having vaginal sex and did not want to become pregnant. Make
sure to use the following words from today’s lesson in your paper:
 Sperm
 Semen
 Ejaculation
 Penis
 Egg
 Ovary
 Fallopian tube
 Uterus
 Cervix
 Vagina
 Fertilization
 Implantation
 Conception

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg.how much energy e must be supplied to the device? express your answer in joules.

The mantle is made up of which structural zones?