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A construction crew lifts approximately 560 lb of material several times during a day from a flatbed truck to a 32 ft rooftop. A block and tackle system with 50 lb of effort force is designed to lift
A rectactangular surface is placed in a vertical position in fresh water with its top and bottom edges horizontal.
A venturi meter is inserted in a pipe whose diameter is 12 in. The diameter of the meter at its throat is 6 in. and the factor C1 for the meter is .980.
A 2 L bottle of a carbonated beverage (Coke) at 20 °C is placed in a cooler with 10 L of saturated liquid water and 30 kg of ice (both at 0.01 °C).
Assume that a seismically excited system is accurately modeled by a mass attached to the ground by a spring and a damper in parallel. You need to determine whether the weld connecting the spring to th
If an ice cube, one inch on a side, is placed in the box and the box placed in an ambient medium at 90F with an external heat transfer coefficient of h=10W/m^2K, how long is required for half the ice
A commercial heat pump has energy in to the system at a rate of 60 kW from a thermal reservoir. If the power input from an electric motor is 15 kW.
A spherical copper shell, of inside radius 5cm and wall thickness 1cm, loses heat to the surrounding air, which is maintained at 25C. The inside surface of the shell is maintained at Ti=100C.
Determine the values of Q that minimizes unit sales cost UC = TC/Q; and compute the annual profit earned by the plant at this quantity.
The vessel volume is 1.5m^3 and a standard six-blade open turbine with blades at 45C is to be used with Da/W=8 and Da/Dt=0.35.
Design a process for the manufacture of 10^6 kg per year of mayonnaise. the shelf life of the product is expected to be 1 year.
An air-hockey puck has a mass of 50 g and is 9 cm in diameter. It is placed on an air hockey table at 20 C, and the film of air under the puck is 0.12mm thick.
The elastic modulus of diamond is measured by applying a force parallel to the body diagonal of the unit cell and measuring the displacement.
The robot’s control memory has a 10 bit capacity. It is assumed that the mechanical errors associated with the arm are normally distributed with the mean at the given taught point
A truck is traveling at v0 = 60mph when the driver applies the brakes to come to a stop. The deceleration of the truck is constant and the truck comes to a complete stop after braking for a distance o
In a tempering process, glass plate, which is initially at a uniform temperature Ti, is cooled by suddenly reducing the temperature of both surfaces to Ts.
A vehicle is stuck on the railroad tracks as a 30*10^6 lb train is approaching with a speed of 75mph. As soon as the problem is detected, the train's emergency brakes are activated, locking the wheels
A closed, rigid tank whose volume is 1.5 m3 contains refrigerant 134a, initially a two phase lipuid-vapor mixture at 10C. the refrigerant is heated to a final state where temperature is 50C and qualit
A house has a composite wall of plaster board (Lp = 10mm, k=0.72 W/m.K), fibre glass insulation (Lb=100mm, k=1.4 W/m.K), and plywood (Lp = 20mm, k=0.12 W/m.K), as indicated in the sketch.
Water flows through a pipe at an average temperature of T=70°C. The inner and outer radii of the pipe are r1=6cm and r2=6.5cm, respectively.
A 0.2-cm-thick, 10-cm-high, and 15-cm-long circuit board houses electronic components on one side that dissipate a total of 15 W of heat uniformly.
This is a solid mechanics question involving a rigid bar pinned at one end and held up by steel cables with a load acting downward on the rigid bar.
An open feedwater heater operates steadily with 30 kg/hr of liquid water entering one inlet at 40 °C and 700 kPa. Water vapor enters a second inlet at 200 °C and 700 kPa.
A 10 kW electric heater is used to heat 2 kg of air contained in an insulated rigid tank from 400 kPa and 50 °C to 200 °C.
An open belt drive connects two pulleys 1.2 and 0.5m diameter on parallel shafts 3.6m apart. The belt has a mass of 0.9kg/m length and maximum tension in it is not to exeed 2kn.