Aboy finds an abandoned mine shaft in the woods, and wants to know how deep the hole is. he drops in a stone, and counts 4 seconds before he hears the "plunk" of the stone hitting the bottom of the shaft. approximately how deep is the shaft? (assume a gravitational acceleration of 9.8 m/s2 and no significant air resistance.)

Which of the following is not a characteristic of s waves? a. travel slower than p waves. b. cannot be detected in locations more than 105° from an earthquake’s epicenter. c. travel through solids and liquids. d. only affect coastal regions.

The magnitude of the amount of energy released by burning a fuel source, measured in energy per unit mass, is called its fuel value. note that the fuel value is the negative of the isobaric specific heat of combustion for the fuel. if all the energy obtained from burning 1.23 pounds of butane with a fuel value of 10.85 kcal/g is used to heat 128.0 kg of water at an initial temperature of 18.3 °c, what is the final temperature? note that 1 lb = 453.6 g.

The substances that are necessary for producing of certain hormones and that store and transport vitamins