On a very cold day, a child puts his tongue against a fence post. It is much more likely that his tongue will stick to a steel post than to a wooden post. This is because:
A. steel has a higher specific heat
B. steel is a better radiator of heat
C. steel has a higher specific gravity
D. steel is a better heat conductor
E. steel is a highly magnetic material
Answer: D. steel is a better heat conductor
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The rms speed of the molecules of a gas is 200 m/s at a temperature 300 K. What is the mass of the individual molecules?
A) 2.13 × 10-25 kg B) 2.45 × 10-25 kg C) 5.66 × 10-25 kg D) 1.78 × 10-25 kg E) 3.11 × 10-25 kg
The isotope 64Zn has a nuclear radius of 4.8 × 10^-15 m. Approximately what is the nuclear radius of the isotope 125Te?
a. 2.0 × 10^-15 m c. 2.7 × 10^-15 m b. 3.6 × 10^-15 m d. 6.0 × 10^-15 m
The electric field in the region defined by the y-z plane and the negative x axis is given by E = ?ax, where a is a constant. (There is no field for positive values of x.) As ?x increases in magnitude, relative to V = 0 at the origin, the electric potential in the region defined above is
a. a decreasing function proportional to ?|x2|. b. a decreasing function proportional to ?|x|. c. constant. d. an increasing function proportional to +|x|. e. an increasing function proportional to +|x2|.
A set of twins, Andrea and Courtney, are initially 10 years old. While Courtney remains on Earth, Andrea rides on a spaceship that travels away from Earth at a speed of 0.60c for 10 years (as measured by Courtney)
At the end of the trip, Courtney is 20 years old. How old is Andrea? A) 10 years B) 12 years C) 18 years D) 20 years