Auniform rod xy of weight 10.0n is freely hinged to a wall at x. it is held horizontal by a force f acting from y at an angle 30° to the horizontal, as shown.

what is the value of f?
a- 5.0 n b- 8.7cm c- 10.0cm d-20.0cm

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.