1ghisticant c) What is the density of the cube in kg/m? Show your work. How many significant figures you should have in your answer?

A ship moves at a constant speed between Earth and Alpha Centauri, 4.2 light years away. According to the ship's passengers, the journey lasts 3 years. What is the speed of the ship? Use the formula for gamma γ and express the answer in c.

Carbon-14 is radioactive while Carbon-12 is stable.  In your body, the ratio of C-14 to C-12 is for every 10,000 C-14 atoms, there are 1 trillion (1,000,000,000,000) C-12 atoms.  This is the normal ratio for livings things.  In a piece of a sabre-tooth tiger bone, a scientist finds there are only 625 C-14 atoms for every 1 trillion C-12 atoms.How old is the sabre-tooth tiger bone? The half-life for Carbon-14 is 5730 years.

Carbon-14 (14C) is a radioactive isotope of carbon with a half-life of 5730 years—meaning that half of the 14C in a sample decays into 14N during that time. Suppose a scientist analyzes a sample of ancient plant material from a bog and finds that it contains 1/8th as much 14C as when it formed. Roughly how old is the sample? _____ years