A bimetallic strip is formed from two materials that have different heat capacities
Indicate whether the statement is true or false
F
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What positive effect have supernovae had on the development of life on Earth? a. Supernovae are the main source of background radiation needed for mutations. b. Chemical elements necessary for life can only be formed in supernovae
c. The formation of the Sun was triggered by a supernova event. d. Planets form by accretion of material in the expanding remnant of a supernova. e. Neutrino bombardment was necessary to form the first simple proteins.
Which of the following statements about the sunspot cycle is not true?
A) The number of solar flares peaks about every 11 years. B) The rate of nuclear fusion in the Sun peaks about every 11 years. C) The number of sunspots peaks approximately every 11 years. D) The magnetic polarity of the Sun reverses approximately every 11 years. E) At solar minimum, the first sunspots form at mid-latitudes on the Sun.
Is the mass of iron greater than, less than, or equal to the mass of aluminum?
A) The mass of iron is equal to the mass of aluminum. B) The mass of iron is greater than the mass of aluminum. C) The answer depends on temperature. D) This is an incorrectly stated question. Iron and aluminum are types of material, mass is the property of an object. E) The mass of iron is less than the mass of aluminum.
Figure 2-70 shows a section of a large surface plate used for precision measurements. A person touches the surface and thereby induces heat transfer through the plate. Neglecting radiation involved, write the node equations for nodes 1, 5, and 12.
