An 18.3 kg block is dragged over a rough, hor- izontal surface by a constant force of 107 N
acting at an angle of 26.3° above the horizon-
tal. The block is displaced 6.77 m, and the
coefficient of kinetic friction is 0.208.

1. Find the work done by the 107N force. the acceleration of gravity is 9.8 m/s
Answer in J.

2. Find the magnitude of work done by the force of friction

Select the word from the list that best fits the definition classification of most stars on the h-r diagram

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.

22. the top of a cliff is located a distance h above the ground. at a distance h/2 there is a branch that juts out from the side of the cliff, and on this branch a bird's nest is located. two children throw stones at the nest with the same initial speed, one stone straight downward from the top of the cliff and the other stone straight upward from the ground. in the absence of air resistance, which stone hits the nest in the least amount of time?