The HTGR is attractive because its higher operating temperature indicates a greater thermal efficiency in operation
What will be an ideal response?
The higher the high temperature for a given low temperature, thermodynamics
says, the higher the maximum efficiency. This is a correct statement.
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Which one of the following is true for deceleration?
a. The acceleration is in the direction opposite the motion. b. The acceleration is zero. c. The acceleration is necessarily negative. d. The velocity remains constant.
Energy and Momentum: An object initially at rest suddenly explodes in two fragments of masses 2.6 kg and 3.3 kg that move in opposite directions. If the speed of the first fragment is 3.6 m/s, find the internal energy of the explosion.
A. 30 J B. 30 kJ C. 38 J D. 38 kJ
The objective and the eyepiece of a refracting astronomical telescope have focal lengths of 320 cm and 4.0 cm, respectively
The telescope is used to view Neptune and the final image is set at infinity. The diameter of Neptune is 4.96 × 107 m, and its distance from Earth at the time of observation is 4.4 × 1012 m. What is the angle (in milliradians) subtended by the final telescopic image of Neptune? A) 0.90 mrad B) 1.1 mrad C) 1.3 mrad D) 1.5 mrad E) 1.7 mrad
The inside of a house is at 20°C on an early morning when the temperature outside is 15°C. The next morning the inside temperature is the same, but the outside temperature is now 5°C. How much does the energy per unit time lost by conduction through the walls, windows, doors, etc., change for the house from the first morning to the second one
a. Since the inside temperature stays the same, the loss is the same both days. b. The loss reduces to 1/3. c. The loss triples. d. The loss increases by 5/278 since we need to use the Kelvin scale for this calculation.