Agas has an initial volume of 2.4 l at a pressure of 1.5 atm and a temperature of 273 k. the pressure of the gas increases to 4.5 atm, and the temperature of the gas increases to 313 k.

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?

How do the kidneys affect homeostasis

The radioactive isotope of lead, pb-209, decays at a rate proportional to the amount present at time t and has a half-life of 3.3 hours. if 1 gram of this isotope is present initially, how long will it take for 80% of the lead to decay? (round your answer to two decimal places.)