For the sequence t defined by tn = 2n -1 n ≥ 1

1) Find t3
2)Find t7
3)Find t100
3
4)Find ∑ ti
i=1

3
5)Find ∏ ti
i=1

6)Find t2077

6
7)Find ∏ ti
i=3

7
8)Find ∑ ti
i=3

B. For the sequence w defined by
wn = 1/n – 1/n+1 n ≥ 1

3
9)Find ∑ wi
i=1
10
10)Find ∑ wi
i=1

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

Acompressor receives the shaft work to decrease the pressure of the fluid. a)- true b)- false