10) Bob is pushing horizontally on a 19 kg crate on a flat surface with kinetic friction coefficient µk = 0.65, maintaining a constant speed of 1.2 m/s. a) Do a free-body diagram for the crate, and use Newton’s First Law to find the force Bob is doing on the crate. b) Find Bob’s power output. c) Find the total work he did over a distance of 130 m. d) One gummy bear provides approximately 7.5 Calories of energy (1 Calorie = 4184 joule). Approximately how many gummy bears does Bob need to eat to push the crate for 130 m, assuming their energy is converted with perfect efficiency into mechanical work?
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10) Bob is pushing horizontally on a 19 kg crate on a flat surface with kinetic...
7) A crate is being pushed horizontally on a flat surface with kinetic friction coefficient µk = 0.28. The push force is 36 N and its acceleration is 1.2 m/s2 , a) Draw a free-body diagram and write both components of Newton’s Second Law. b) Replace into one equation from the other one and solve it to find the crate’s mass.