Assume you have a string 2 m long, with a diameter of 1.8 mm. You have a linear mass density, lambda, of 0.1 g/m. What is the mass of the string? You can assume your string is a cylinder. Be careful with units!
If 15 g of liquid nitrogen boil, how much heat is absorbed from the atmosphere (or your hand if you touch it)? Include the unit for heat (1 letter).