A sample contains 24 g of a radioactive isotope. How much radioactive isotope remains in the sample after 2 half-lives?

A. 3 g

B. 6 g

C. 12 g

D. 1.5 g

A rectangular tank contains water to a dept of 2m. If the base is 4m * 3m, calculate the force on the base (Density of water = 10³kgm³ g = 10m/s/s)

Estimate the number of atoms in 1 cm^3 of a solid

Two identical cows fell into a muddy hole. One fell on its side and the other on its feet. Which one sunk furthest into the mud and explain your answer

A particle travels 15 times around a 10-cm radius circle in 42 seconds. what is the average speed (in m/s) of the particle?

If an element has 4 valence electrons, how many dots will be in the elements dot diagram?

Which of the following is an example of a research topic that is too broad? A. All about hip-hop music B. Hip-hop and the voice of outrage C. Rhyme and meter in hip-hop music D. Block parties and the origins of hip-hop

What's is the power output of an engine that does 60000 J of work in 10 seconds

Which of the following correctly identifies a voltage source and its method of developing electric potential? a. primary cell-heat action on a device b. thermocouple-chemical action c. dry cell-chemical action d. generator-genetic action

A car travels from boston

What number is between 2000 and 2500