Conventional rim brakes on a bicycle apply an approximately 1-kN force at the rim of the wheel, some 60 cm in diameter. Disc brakes, which are becoming increasingly popular, apply roughly 4 kN near the outer edge of a 200-mm-diameter disc. Estimate the torques to determine which braking system exerts the greater torque and by approximately what factor?

Aria drove to the store, did some shopping, and then came home. during maria's trip, when was her displacement equal to zero?

Positrons are spontaneously emitted from the nuclei of

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.