If the temperature of an iron sphere is increased
A) its mass will decrease.
B) its volume will decrease.
C) its density will decrease.
D) its density will remain unchanged.
E) its density will increase.
C
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_____ says that the amount of energy flowing out of the top of a layer in the star must be equal to the amount of energy coming in at the bottom, plus whatever energy is generated within the layer
A) The law of energy equilibrium B) The law of conservation of energy C) Mass-energy equivalence D) Newton's law of energy transfer
Uniform Circular Motion: A 20-g bead is attached to a light 120 cm-long string as shown in the figure. If the angle ? is measured to be 18°, what is the speed of the mass?
A. 0.55 m/s B. 2.0 m/s C. 3.8 m/s D. 1.3 m/s E. 1.1 m/s
Identify the FALSE statement. Stellar nucleosynthesis:
is the term for the process by which stars create the heavier elements. means stars use their small atoms to produce larger atoms. is a normal process that happens during the life cycle of stars. reactions vary and are dependent on the mass of the star. produces elements up to atomic number 26 (iron) in low-mass stars like our Sun.
A certain material is in a room at 27°C. If the absolute temperature (K) of the material is tripled, its resistance quadruples. (Water freezes at 273 K.) What is the value for a, the temperature coefficient of resistivity?
a. 0.0050 (°C)-1 c. 1 (°C)-1 b. 0.0025 (°C)-1 d. 3 (°C)-1