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A mass of 20 kg is suspended from a spring of stiffness 10,000 N/m. The vertical motion of the mass is subject to Coulomb friction of magnitude 50 N. If the spring is initially displaced downward by 5 cm from its static equilibrium position, determine
(a) the number of half cycles elapsed before the mass comes to rest,
(b) the time elapsed before the mass comes to rest, and
(c) the final extension of the spring.
the total pressure of air entering a single-stage centrifugal compressor is 1.013 bar and the total t is 288 k. the
a 12 ft by 12 ft square room has one exterior wall with a surface temperature of 58f and three interior wall surface
A barrel contains a 0.120-m layer of oil floating on water that is 0.250 m deep. The density of the oil is 600 kg/m.
nitrogen gas is contained in a rigid 1-m tank initially at 10 bar 300k. heat transfer to the contents of the tank
a gate is 0.5 m wide and 0.6 m tall and is hinged at the bottom. on one side the gate holds back a 0.5 m deep body of
a 0.12m3 rigid tank contains saturated refrigerant r134a at 800kpa. initially 25 percent of the volume is occupied by
The length of the cable between points A and B is 87 m, and the effective cable mass is 2 kg /m when the buoyancy of the cable is accounted for. Determine the tensions at both A and B.
How much energy storage capacity would Scotland need to satisfy all its electricity needs with renewable generation and provide a stable grid
10 kg of water in a piston cylinder exists as a saturated mixture at 120 kpa with quality 40. the water is now heated
a residential heat pump with a coefficient of performance of 2.4 delivers energy to the dwelling at a rate of 20 kw.
water vapor enters a turbine operating at steady state at 30 mpa 600 oc and expands adiabatically to 6 mpa. if the
Calculate the molar absorptivity of A at this wavelength.
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