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A 17-tooth 20 normal pressure-angle helical pinion with a right-hand helix angle of 30 rotates at 1800 rev/min when transmitting 4 hp to a 52-tooth helical gear. The normal diametrical pitch is 10 teeth/in, the face width is 1.5 in, and the set has a quality number of 6. The gears are straddle-mounted with bearings immediately adjacent. The pinion and gear are made from through-hardened steel with surface and core hardness of 240 Brinell on the pinion and surface and core hardness of 200 Brinell on the gear. The transmission is smooth, connecting an electric motor and a centrifugal pump. Assume a pinion life of 10^8 cycles and rim thickness factor (KB) is equal to 1.00 and a reliability factor (KR) is equal to 0.85 for both pinion and gear. Perform stress analysis (bending and contact) for both pinion and gear and determine factor of safety of gears in bending.
Mud is stopped using a wall made from 1.2 m high x 0.25 m wide rectangular concrete blocks as shown in figure below. Blocks density is 2700 kg/m3, mud density is 1800 kg/m3, and friction coefficient between ground and concrete blocks is f = 0.3 . The..
a tennis ball is initially at a height of 4 m above a solid marble floor. the tennis ball is traveling 15 msec at an
The lattice constant for BCC tantalum at 20oC is 0.33026 nm and its density is 16.6 g/cm3. Calculate a value for its atomic mass.
a cylinder made of astm a242 steel is 50cm in diameter and 250mm long and has a wall thickness of 24mm. a round bar of
12 lbm of carbon c reacts with 24 lbm of oxygen o2 to form 22 lbm of carbon dioxide co2 plus an unknown amount of
an air conditioner operating at steady-state takes in moist air at 27 oc 1 bar and 70 relative humidity. the moist air
a pump accepts liquid water at 60 acircdegf and 14 psia and compresses it to a pressure of 100 psia. the pump has a
atank of 0.1-m3volume contains air at 298.15k 25degc and 101.33kpa.the tank is connected to a compressed-air line which
a cylinderpiston contains carbon dioxide at 1 mpa 300oc with a volume of 200 l. the total external force acting on the
A 30-cm-long, 1-cm-diameter aluminium fin (k=237 W/m·K) is exposed to an environment at 22oC. The base temperature of the fin is maintained at 80 oC. The heat transfer coefficient between the rod and the surrounding air is 11 W/m2·K.
a refrigerator uses 134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle. the
hot water at 60 c enters a thin copper tube with an inside dia of 6mm and a length of 20m. the copper tube is exposed
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