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A synthetic belt of density 994kg/m3 is used in an open-belt drive. The belt is wrapped around a pulley of diameter 900mm running at 324rpm. If the angle of contact with the small pulley is 2∙π/3 radians and the maximum stress on the tight side is limited to 2000kPa. The coefficient of friction between the belt and the pulley is 0.35 and the belt width and thickness are 250mm and 10mm, respectively. . Calculate:
The power transmitted by the belt in Watts (W)
Suppose you are a requirement engineer, according to your point of view which requirement elicitation technique will remain better to gather the requirements for this system? Explain in 5 to 7 lines.
what seed spacing is required when planting maize in rows 102cm apart if the desired plant population is 6000 plants per hectare with an average emergence of 85% expected
An R-410a heat pump cycle shown in the figure below has an R-410a flow rate of 0.05 kg/s with 5 kW into the compressor. The following data are given:
State 1 2 3 4 5 6
P, kPa 3100 3050 3000 420 400 390
T, oC 120 110 45 -10 -5
h, kJ/kg 377 367 134 280 284
Calculate the heat transfer
a) from the compressor
b) from the R-410a in the condenser
c) to the R-410a in the evaporator
Consider an ordinary shower where hot water at 60 oC is mixed with cold water at 10 oC. If it is desired that a steady stream of water at 45 oC be supplied, determine the ratio of the mass flow rates of the hot to cold water. Assume the heat losses from the mixing chamber to be negligible and the mixing to take place at a pressure of 150 kPa.
A Certain rocket, initially at rest, is shot straight up with an acceleration of 6t m/s2 during the first seconds after blast-off, after which the engine cuts out and is subject
only to gravitational acceleration. How high will the rocket go? Use g=10 m/s2
A full-adder has Cin = 1. What are the sum (©) and the output carry (Cout) when A = 1 and B = 1?
A vertical face ogee 1.5m is operating at a design head of 3m. Calculate the depth of flow immediately dowmstream from the weir
A solid cylinder, 0 ≤ r ≤ b, is initially at zero temperature. For times t > 0, the boundary condition at r = b is subjected to a time-dependent prescribed temperature f (t) defined by
First plot (i.e., sketch) the boundary condition f (t). Using Duhamel’s theorem, develop an expression for the temperature distribution T(r,t) in the cylinder for times (i) τ1 3.
Steam at 3.5 MPa and with a 75.38C superheat rejects 1973.36 kJ per kg of steam heat at a
constant pressure, determine
a. Properties of steam at state 1
b. Properties of steam at state 2
c. Final Temperature
d. Change in specific entropy
