Class XI

Two moles of an ideal gas (γ=1.4γ=1.4) expands slowly and adiabatically from a pressure of 5.00 atm and a volume of 12.0 L to a final volume of 30.0 L. Find Q, W, and ΔEintΔEint.
  1. 100 J, 4.88 kJ, -4.88 kJ
  2. 1 J, 4.22 kJ, -4.22 kJ
  3. 0, 4.66 kJ, -4.66 kJ
  4. 10 J, 4.44 kJ, -4.44 kJ
A .car starts from city A and it travels 50 km in a straight line to city B. Immediately it turns around, and returns to city A. It took 2 hours for this round trip. The average speed of the car for this round trip is
  1. 0 km/h
  2. 25 km/h
  3. 50 km/h
  4. 100 km/h
A 14.5 kg mass, fastened to the end of a steel wire of unstretched length 1.0 m, is whirled in a vertical circle with an angular velocity of 2 rev/s at the bottom of the circle. The cross-sectional area of the wire is 0.065 cm2cm2. Calculate the elongation of the wire when the mass is at the lowest point of its path.
  1. 1.539 ×× 10−410−4 m
  2. 1.339 ×× 10−410−4 m
  3. 1.239 ×× 10−410−4 m
  4. 1.439 ×× 10−410−4 m
A house has well-insulated walls. It contains a volume of 100 m3m3 of air at 300 K. Calculate the energy required to increase the temperature of this air by 1.00∘∘ C. (CP=72R)
  1. 131 kJ
  2. 101 kJ
  3. 139 kJ
  4. 118 kJ
What is the average kinetic energy of the helium atoms in a balloon of diameter 30.0 cm at 20.0∘∘C and 1.00 atm?
  1. 5.79 ×× 10−2110−21 J
  2. 6.07 ×× 10−2110−21 J
  3. 6.57 ×× 10−2110−21 J
  4. 7.13 ×× 10−2110−21 J
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