Question

Pg4 10. A solid disk is rotating around its central axis at an angular velocity of 10.6 rad/s. If the disk speeds up to a rate to 18.2 rad/s in 2 seconds a) What is the angular acceleration? b) Through what angle did it rotate? [2 points] Tla). Calculate the absolute pressure at an ocean depth of 1.050m. Assume the density of seawater is 1,024 kg/m^3 and the air above exerts a pressure of 101.3 kPa. [1 point 11b). A horizontal pipe has a smooth reduction from an inlet radius of 0.05m at one end to an outlet radius of 0.025m at the other end. If the inlet speed is 7.2 m/s, a) what is the speed of the water at the other end? b) What is the flow rate?. [2 point) latm = 1x1OʻN / m² 12. 0.20kg of hot tea at 98 degrees Celsius is poured into a 0.150 kg glass cup initially at 27 degrees Celsius. What will be the common final temperature T of the tea and cup when equilibrium is reached? Assume no heat is lost (neglect the heat absorbed by the Calorimeter). [1 point]

Answer 1

10 c(a) Motion . wing १vahion शु wo taf, ७ = 18.2 rad (s = 10.Grad(s +x•2 x = 3.8 rad/s? (5) w²= wo? +2xo (18-2- (10.८)+ 2x3-86- ৮ = 2৪.৪ raolons हे)

P= Po t egh 1024x9.8 x 10SO 101- 3 xIổ Pa + P = 10 536-96x10 Pa 10 1- 3 x10° Pa t P = 10638.26 X10 Pa 10638·26 K %3D (6) by continuily, A,v = AzVy = flowrak . x2-2m|s = a (0-025mv, V - 28-8 m|s { low rak A,VI A, V2 0.O5652m²/s

12) heal gain by up = heat loss by 0:201g x4186 J/e;"C x (98-7) O •I S Olx 8401|/19°ex(T-27)= O•IS 126 T. 3402 - 8204 S. 6 -837.2T 963-2T 8 S447.6 T: 88.71´c