A truck weighing 200kN descends a 250m hill with brakes engaged at a constant speed. These brakes can withstand an 18 deg C increase in temperature safely. Consider that the brakes retain 22% of the energy from the descending truck. Will the brakes be expected to fail? ( mass of brakes = 200kg, specific heat of brake material = 1050 J/kgC)

1:E1 A docs.google.com/for Untitled Section Determine the force P required to lower the 40-kg cylinder at a slow steady speed. The coefficient or friction between the cord and its supporting surface is 0.30. (g-10 m/s³). 40 kg Your answer If (4, =0.4) then the o between the normal force N and the friction force F will be Your answer العربية الإنجليزية III

A 2,600 lb automobile comes to a complete stop from 65 mph. If 60% of the braking capacity is provided by the front disk brake rotors, determine their temperature rise. Each of the two cast-iron rotors weighs 15 lb and has a specific heat of 0.14 Btu/(lbm - °F). (Express your answer using three significant figures.) T- To = °F

A system of a 50 kg empty trolley and a 140 kg counterweight is shown in Figure below. After the counterweight has dropped 10 m from rest, the velocity of the trolley is 6 m/s. If all frictional resistances can be regarded as a single force F acting on the trolley parallel to the inclined plane, calculate the resistance of the force. Note that pulleys are smooth and frictionless.