Which of the following radionuclides has the shortest half-life?
a. Potassium-40
b. Uranium-238
c. Carbon-14
d. Uranium-235
c
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Which spacecraft gave or is giving us our best information about Mercury?
A) Pioneer 10 B) Mariner 10 C) Voyager I D) Viking 2 E) Messenger
Even if Martian meteorites contained life, the life could not possibly have survived the journey from Mars to Earth
Indicate whether the statement is true or false
An amateur astronomer grinds a double convex lens whose surfaces have radii of curvature of 40 cm and 60 cm. The glass has an index of refraction of 1.54. What is the focal length of this lens in air?
A) 42.5 cm B) 126 cm C) 88.8 cm D) 44.4 cm E) 222 cm
A 20-m long steel wire (cross-section 1.0 cm2, Young's modulus 2.0 × 10^11 N/m2), is subjected to a load of 25 000 N. How much will the wire stretch under the load?
a. 0.25 cm b. 2.5 cm c. 12.5 cm d. 25 cm e. 1.25 cm