1) Two crates of mass 20.0 kg and 35.0 kg are pushed up along an incline of 33.0 degrees by a force of 550 N. Coefficients of kinetic friction are 0.25 and 0.37 respectively for the two crates. (a) Draw force diagrams for each of the crates. (b) Calculate the acceleration of the two crates. (c) Calculate the contact force between the two crates. (d) What would be the contact force if the two crates are reversed?

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.