Consider the sun and its largest planet Jupiter. On the line joining them, how far from the center of the sun is their center mass?
Is it within or outside the sun? (Jupiter-sun distance is 778 × 106 km, diameter of the sun is 1.4 × 106 km, the sun is 1000 times as massive as Jupiter)
0.78 × 106 km from the center of the sun, just outside the solar surface
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In _________fracture, the fracture surface follows the grain boundaries.
Fill in the blank(s) with the appropriate word(s).
A batter applies an average force of 8000 N to a baseball for 1.1 ms. What is the magnitude of the impulse delivered to the baseball by the bat?
What will be an ideal response?
LR Circuits: A resistor and an inductor are connected in series to a battery. The time constant for the circuit represents the time required for the current to reach
A. 25% of the maximum current. B. 37% of the maximum current. C. 63% of the maximum current. D. 75% of the maximum current. E. 100% of the maximum current.
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
