Which of the following best characterizes electrical conductors?
a. high tensile strength
c. electric charges move freely
b. poor heat conductors
d. low mass density
C
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Gravity obeys the inverse square law, which implies that the gravitational force of one body on another will be ____ times stronger at two meters than at six meters apart
a. 2 b. 3 c. 4 d. 9 e. 10
The Mars Rovers found undisputed microfossils, proving life once existed on Mars
Indicate whether the statement is true or false
Which of the following statements about various stages of core nuclear burning (hydrogen, helium, carbon, and so on) in a high-mass star is not true?
A) Each successive stage creates an element with a higher atomic number and atomic mass number. B) As each stage ends, the reactions that occurred in previous stages continue in shells around the core. C) Each successive stage lasts for approximately the same amount of time. D) As each stage ends, the core shrinks and heats further.
A camera lens has a focal length of 50.0 mm and an aperture setting of f/4.00. What is the aperture diameter of this lens?
A) 14.2 mm B) 13.6 mm C) 10.1 mm D) 12.5 mm E) 15.0 mm