Two different nuclei emit alpha particles, the energy released in each of these decays being the same. Which of the following has the lowest resulting kinetic energy?
a. The alpha particle from the lighter nucleus.
b. The alpha particle from the heavier nucleus.
c. The heavier daughter nucleus.
d. The lighter daughter nucleus.
C
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The "father" of atomic materialism was
A) Plato. B) Ptolemy. C) Kepler. D) Democritus. E) Newton.
Refracting Telescope: A person is designing a telescope with a magnification of 10. If the telescope is limited to a length of 0.20 m, what is the approximate focal length of the objective?
A. 16 cm B. 17 cm C. 18 cm D. 19 cm
A circular loop of wire is in the plane of the paper. The south pole of a bar magnet is being moved from a position in front of the paper in a direction away from the center of the loop. The direction of the induced current in the loop
A) is clockwise. B) is north. C) is counterclockwise. D) is south. E) cannot be determined.
The temperature of a 100 m diameter cooling pond is 7°C on a winter day. If the air temperature suddenly drops to –7°C, calculate the thickness of ice formed after three hours.
GIVEN
? A round cooling pond on a winter day
? Initial temperature (Tl) = 7°C
? Air temperature (T?) drops to –7°C
? Pond diameter (D) = 100 m
FIND
? The thickness of ice (?) formed after 3 hours
ASSUMPTIONS
? The thermal capacitance of the ice layer is negligible
? Radiative heat transfer is negligible
? Bulk water temperature remains constant at 7°C
? Air temperature is constant at –7°C
? The air and water are still
SKETCH
PROPERTIES AND CONSTANTS
The ice property values given in the problem statement of Problem 9.37 is
Extrapolating from Appendix 2, Table 28, for dry air at the estimated film temperature of –3.5°C
From Appendix 2, Table 13, for water at the estimated film temperature of 3.5°C
