How do we know the Sun within our solar system is not a first generation star born right after the Big Bang?
a. There are observations of stars in the place of our Sun that predate the Sun.
b. There are elements present in our solar system that are only formed by stars that lived and died long ago.
c. The solar system is in a specific region within the Milky Way Galaxy where many stars are known to have been present earlier.
Ans: b. There are elements present in our solar system that are only formed by stars that lived and died long ago.
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A copper cable needs to carry a current of 160 A with a power loss of only 2.0 W/m. What is the required radius of the copper cable? (The resistivity of copper is 1.7 × 10^?8 ??m)
a. 0.43 cm b. 0.83 cm c. 1.7 cm d. 2.6 cm e. 0.33 cm
A typical atom has a size of about
A) 1 nanometer (10-9 meters). B) 1 millimeter (10-3 meters). C) 1 picometer (10-12 meters). D) 1 Angstrom (10-10 meters).
The type of EM wave having the highest frequency is
a. ultraviolet. b. infrared. c. x-rays. d. microwave. e. gamma rays.
In the conventional scenario, during phase of planet formation caused the jovian planets to form?
A) core-accretion B) fragmentation C) differentiation D) collision E) condensation