Dexter industries purchased packaging equipment on january 8 for $72,000. the equipment was expected to have a useful life of three years, or 18,000 operating hours, and a residual value of $3,600. the equipment was used for 7,200 hours during year 1, 5,400 hours in year 2, and 5,400 hours in year 3. required: 1. determine the amount of depreciation expense for the three years ending december 31, by (a) the straight-line method, (b) the units-of-activity method, and (c) the double-declining-balance method. also determine the total depreciation expense for the three years by each method. round the final answers for each year to the nearest whole dollar.1) find the force transmitted by the coupling between the nozzle and hose. 2) indicate whether the coupling is in tension or compression. 3) find the velocity of water flowing through the hose.

In general, how do thermosetting plastics compare to thermoplastics in mechanical and physical properties?

Tom is having a problem with his washing machine. he notices that the machine vibrates violently at a frequency of 1500 rpm due to an unknown rotating unbalance. the machine is mounted on 4 springs each having a stiffness of 10 kn/m. tom wishes to add an undamped vibration absorber attached by a spring under the machine the machine working frequency ranges between 800 rpm to 2000 rpm and its total mass while loaded is assumed to be 80 kg a) what should be the mass of the absorber added to the machine so that the natural frequency falls outside the working range? b) after a first trial of an absorber using a mass of 35 kg, the amplitude of the oscillation was found to be 10 cm. what is the value of the rotating unbalance? c) using me-3.5 kg. m, find the optimal absorber (by minimizing its mass). what would be the amplitude of the oscillation of the absorber?

Ahelical coil spring has a mean diameter of 50 mm, a wire diameter of 5.5 mm and is wound with a pitch of 10 mm. the spring steel has an ultimate strength of 1250 mpa. find the force needed to compress the spring solid and the wire stress in this condition. state whether the spring will return to its initial length.