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16A small stepladder has vertical rails and horizontal steps formed from a C-section aluminum channel (Figure P5.28). Two rivets, one in front and one in back, secure the ends of each step. The rivets attach the steps to the left- and right-hand rails. A 200-lb person stands in the center of a step. If the rivets are formed of 6061-T6 aluminum, what should be the diameter dof the rivets? Use a factor of safety of 6, and round your answer to the nearest 1of an in.
Determine the steady-state temperature of the workpiece. Estimate the time required for the workpiece to come within 5°C of the steady-state temperature if it is at an initial, uniform temperature of 25°C.
Direct Stress and Strain, A steel rod having a cross-sectional area of 0.005m2 and length 3m is attached to supports.
closing a value suddenly in a pipe with flowing water can generate water hammer where the momentum of the water column
the cooling coil of a small air-conditioning system is to be designed for a heat-transfer rate of 48000 btuhr from air
a poly-dispersed aerosol consists of spherical particles within the size range 1.0-10.0 micrometers. the particles are
Air at atmospheric pressure and a temperature of 25°C is in parallel flow at a velocity of 5 m/s over a 1m long flat plate that is heated with a uniform heat flux of 1250 W/m2. Assume the flow is fully turbulent over the length of the plate.
the bell-crank mechanism consists of a bent rod and an attached 5-kg weight. the rod has negligible weight and the mass
bullet b weighs 0.5oz and blocks a and c both weigh 3 lb. the coefficient of friction between the blocks and the plane
the velocity of a particle moving in the x-y plane is given by 6.12i 3.24j ms at time t3.65s. its average acceleration
a piston cylinder arrangement has two compartments a and b filled with water as shown in the figurebelow. compartment a
a heat pump uses a 100000 gallon swimming pool as a heat source in the winter. when the heat pump is running at full
the 800-lb load is being hoisted at a constant speed using the motor m which has a weight of 90 lb. determine the
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