1) What is the kinetic energy (in Btu) associated with a 300 gm hockey puck flyi

Question

1) What is the kinetic energy (in Btu) associated with a 300 gm hockey puck flying at 120 mph? (2 pts)

2) Assuming an ideal gas , calculate the specific volume in the appropriate units for (6 pts) : a. N 2 at 500 kPa and 900 K b. Neon at 8 kPa and 250 K c. Air at 100 kPa and 298 K

3) . Calculate the specific enthalpy change (in the appropriate units) for the following ideal gas processes by first using an average c P and then by using the ideal gas tables. (12 pts) a. CO 2 at 2000 kPa goes from 500 K to 1300 K b. CO 2 at 2000 kPa goes from 500 K to 600 K c. Air at 320 kPa and 330 K goes to 80 kPa and 330 K

4) . Carefully draw the following graph using air as an ideal gas. (10 pts) a. temperature versus pressure showing lines of constant specific volume and specific enthalpy

5) . Calculate the entropy change for N 2 as it goes from 250 K and 1000 kPa to 1300 K and 60 kPa.

Explanation / Answer

1) Kinetic Energy = 0.5 * mass * velocity^2

KE = 0.5 * (0.3 kg) * (53.64 m/s)

KE = 8.046 Joules

1 BTU = 1055.05585262 J

8.046 Joules = 0.007626 Btu

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