The laws of thermodynamics can be related to the following: (i) the measurement of temperature, (ii) the lowest temperature possible, (iii) conservation of energy, and (iv) only part of heat energy available may be turned into work. Which of these involve the first and second law?
a. (i) and (ii) b. (ii) and (iv)
c. (i) and (iii) d. (iii) and (iv)
d
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How long a tuning fork vibrates when its handle is held against a table is most related to
A) its frequency. B) resonance. C) the conservation of energy. D) the length of its prongs.
In nuclear fusion,
a. light nuclei combine to form a heavier nucleus. b. a large nucleus splits into two smaller ones. c. an initial reaction triggers a chain reaction. d. protons are converted into neutrons and energy.
A DC motor of internal resistance 6.0 ? is connected to a 24-V power supply. The operating current is 1.0 A
(a) What is the start-up current? (b) What is the back emf when the motor is running at full speed? (c) What is the back emf when the motor is running at half speed?
What is the major rock-forming mineral group? Give examples of minerals in this group
What will be an ideal response?