Question

-A Carnot engine operates between a 1500 C reservoir and a -20 C reservoir. What is the efficiency of the engine?
Optional Answers:

83%

- a-A fluid with viscosity 1.2 Pa s moves through a 200-m-long pipe with a 20 cm diameter. What is the resistance to laminar flow, R, in the pipe?
Optional Answers:

1. 6.1x10^6 Pa s/m^3 2. 3.8x10^5 Pa s/m^3 3. 3.8x10^-3 Pa s/m^3 4. 6.1x10^-2 Pa s/m^3

1. b- A fluid with viscosity 1.2 Pa s moves through a 200-m-long pipe with a 20 cm diameter. What difference in pressure between the ends of the pipe is needed for a flow of 0.1 m^3/s?
   Optional Answers:

1. 611 kPa 2. 380 kPa 3. 38 mPa 4. 0.61 Pa

- Aluminum has a coefficient of linear expansion of 2.4x10^-5 C^-1. An aluminum wire at 20 degrees C has length 10 m. It is then heated to 100 degrees C. What is its new length? Optional Answers:

1. 9.981 m 2. 10 m
3. 1.9 cm
4. 10.019 m

PLS ANSWER THESE I WILL RATE

Answer 1