What would happen to light if it was a mechanical type of wave? Hint: Think about what mediums electromagnetic waves can travel through.

Why are people more likely to marry individuals with social and cultural backgrounds very similar to their own? a. parents and other family members always exert pressure to marry within the group. b. people spend a great deal of time alone, and therefore can have few opportunities for meeting people. c. people develop irrational fears of out-group members and are scared to date them. d. people have greater access to individuals like themselves.

Which of the following was not a part of the armistice between germany and the allies? a. germany had to agree to the terms of the treaty of brest-litovsk. b. germany had to surrender its entire submarine fleet to the allies. c. kaiser wilhelm ii had to give his throne. d. all german troops had to be withdrawn from the western front.

An object weighs 40n in air , weighs 20n when submerged jn water and 30n submerged in a liquid of unknown density .what is the density of the liquid?