On a cold day, a metal fence post feels colder to the touch than a tree. This sensation of different temperatures is explained by the fact that
A. the thermal conductivity of the wood in the tree is higher.
B. the thermal conductivity of the metal is higher.
C. the specific heat capacity of the wood in the tree is higher.
D. the specific heat capacity of the metal is higher.
E. the temperature of the tree is higher.
Answer: B
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According to their rotation curves, most spiral galaxies:
A) rotate as a solid body. B) rotate counterclockwise. C) have decreasing rotational speeds with increasing distance. D) contain dark matter. E) contain dark energy.
Based on the number of galaxies visible in the Hubble Deep Field (Figure 20.1 in your textbook), the estimated number of galaxies in our observable universe is
A) about 50,000. B) about 100 million. C) about 100 billion. D) an infinite number.
A ball thrown upwards reaches a maximum height and then comes back down to the original level. At the peak of the motion the velocity and acceleration are both zero
Indicate whether the statement is true or false
Which of the following is not a number that corresponds to the filling of a nuclear shell?
A. 8 B. 18 C. 50 D. 82 E. 126