A turbine blade rotates with angular velocity ?(t) = 2.00 rad/s- 2.1.00 rad/s3 t2. What is the angular acceleration of the blade at t = 9.10 s?
A) -38.2 rad/s2
B) -19.1 rad/s2
C) -86.0 rad/s2
D) -36.2 rad/s2
E) -172 rad/s2
A
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First Law of Thermodynamics: A compression, at a constant pressure of 140 kPa, is performed on 4.0 moles of an ideal monatomic gas for which CV = 3/2 R. The compression reduces the volume of the gas from 0.26 m3 to 0.12 m3. What is the change in the internal (thermal) energy of the gas during this process? (R = 8.31 J/mol ? K)
A. -29 kJ B. -49 kJ C. 29 kJ D. 49 kJ E. 0 kJ
The following images were all taken by spacecraft. Which one shows a comet?
An explosion occurs 34 km away. The time it takes for its sound to reach your ears, traveling at 340 m/s, is
A) 0.1 s. B) 1 s. C) 10 s. D) 20 s. E) more than 20 s.
During an isothermal process, 5.0 J of thermal energy via the process of heating is removed from an ideal gas. What is the work done on the gas in the process?
A) 0 J B) 5.0 J C) -5.0 J D) -10 J