The thermal conductivity of aluminum is twice that of brass. Two rods (one aluminum and the other brass) of the same length and cross-sectional area are joined together end to end
The free end of the brass rod is maintained at 0°C and the free end of the aluminum rod is maintained at 200°C. If no heat escapes from the sides of the rods, what is the temperature at the place where the two rods are joined together?
A) 76°C
B) 133°C
C) 148°C
D) 155°C
B
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Indicate whether the statement is true or false
A radioactive material initially is observed to have an activity of 1 600 decays/s. If six hours later it is observed to have an activity of 400 decays/s, what is its half-life?
a. six hours b. three hours c. twelve hours d. seven hours e. not enough information
If a long spring with spring constant k is cut into 3 equal lengths, what is the spring constant of each of the 3 shorter springs?
a. It is still k. c. It is k/3. b. It is 3k. d. It is k/9.
Which of the following is farthest from the Sun?
A) Pluto B) Neptune C) an asteroid in the asteroid belt D) a comet in the Kuiper belt E) a comet in the Oort cloud