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If the weights of the three children at points A, B, and C are 375 N, 260 N, and 400 N, respectively, determine the magnitude and the point of application of the resultant of the three weights.
A river has a steady speed of 0.461 m/s. A student swims upstream a distance of 1.00 km and swims back to the starting point. How much time is required in still water for the same length swim?
If the speedboat travels 58.4 km/h, in what direction should it head? Express the direction as a compass bearing with respect to due north.
A police car traveling at 101.7 km/h is traveling west, chasing a motorist traveling at 77.0 km/h. What is the velocity of the motorist relative to the police car?
A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.20 m/s at an angle of 21.0° below the horizontal. Find the height from which the ball was th
Determine the mass of water supplied to the sprays to provide 10 m3/h of conditioned air. What is the heater power required?
Find the temperature to which the air is cooled and the thermal loading on both the cooler and heater. Assume that a fan before the cooler absorbs 0.5 kW.
Cooling water enters a cooling tower at a rate of 1000 kg/h and 70 degree C. Calculate the flow rate of the dry air in kg/h and the make-up water required per hour.
What percentage of the water flow rate must be supplied as make-up water to replace the water evaporated into the air stream?
Estimate the moisture picked up by 1 kg of dry air, and the total enthalpy change between the entering and leaving streams expressed per unit mass of dry air. Ans. 0.0864 kJ/kg air, 220 kJ/kg air.
An air-water vapor mixture at 0.1 Mpa, 30°C, 80% RH has a volume of 50 m3. Calculate the specific humidity, dew point, wet bulb temperature, mass of dry air and mass of water vapor.
During the process there is a heat transfer of 60 kJ from the ideal gas to the surroundings. Determine the volume and pressure at the end of the process.
Determined the amount of heat transferred to the air, in kJ, while increasing the temperature to 1200 K. Assume air has the constant specific heats evaluated at 300 K.
Which is rotating about its axis CD at an angular velocity of w1=200 rev/s, with respect to ground. Find the angular acceleration of the disk with respect to ground.
Determine the velocity and acceleration of point A, which is the outermost tip of one of the blades (with respect to ground) when the angle is 0,90,and 180 degrees from the tail.
Determine (a) the mass flow rate through the nozzle, (b) the exit temperature exit temperature of the air, and (c) the exit area of the nozzle.
Determine the required minimum rotor diameter if the unit is to produce 1 MW. What rotor diameter is needed if the wind energy conversion is 38%? Use an average temperature of 15 C.
The ball is in contact with the racket for 3.10 . If the tennis ball has a mass of 63.7, what is the resulting velocity of the ball, , after the ball is hit by the racket?
Determine how long it will take to vaporize all the liquid in the tank. Also, show the process on a T-v diagram with respect to saturation lines.
Determine graphically the magnitude and direction of the resultant force exerted on the bracket using (a) the parallelogram law, (b) triangle law.
A particle moves in the x-y plane such that its postion is defined by r=[(2t)i+(4t^2)j]ft, where t is in seconds. Determine the radial and transverse components of the particle's velocity and accele
The overall heat transfer coefficient is 280 W/ m2· °C. Estimate the maximum flow rate of oil that may be cooled, assuming the flow rate of water is fixed at 230 kg/h.
If its initial velocity is 6.3 m/s, what is its displacement during the time interval? What is the distance it travels during this interval?
Describe the linear, branched, crosslinked and network molecular chain formations in polymers. By comparing (i) LDPE with HDPE and (ii) elastomers with thermoset resins.
Water behind a dam enters an intake pipe at 24psia, 5 ft/s flow through a turbine and exits 200ft below at 19psia, 45 ft/s and specific volume of 0.01602 ft^3/lbm.