A device that measures absolute air pressure is called a barometer
a. True
b. False
Indicate whether the statement is true or false
True
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A newly formed planet or large asteroid becomes molten due to
a. the last infalling objects. b. decay of radioactive element isotopes. c. the last infalling objects and decay of radioactive element isotopes. d. none of the other choices as newly formed planets remain solid inside.
How much water at 20 degrees Celsius is needed to melt 500 grams of ice at 0 degree Celsius?
a. 500 grams b. 1000 grams c. 1500 grams d. 2000 grams
A horizontal disk 1 m in diameter rotates in air at 25°C. If the disk is at 100°C, estimate the number of revolutions per minute at which natural convection for a stationary disk becomes less than 10% of the heat transfer for a rotating disk.
GIVEN
? A rotating horizontal disk in air
? Diameter (D) = 1 m
? Air temperature (T?) = 25°C
? Disk temperature (Ts) = 100°C
FIND
? The rotational speed (w) at which natural convection becomes less than 10% of the thermal effects
of rotation
ASSUMPTIONS
? Steady state conditions
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 28, for dry air at the mean temperature of 62.5°C
We construct a closed Gaussian surface in the shape of a spherical balloon. Assume that a small glass bead with total charge Q is in the vicinity of the balloon. Consider the following statements:
A. If the bead is inside the balloon, the electric flux over the balloon's surface can never be 0. B. If the bead is outside the balloon, the electric flux over the balloon surface must be 0. Which of these statements is valid?
1.Only A is valid. 2.Only B is valid. 3.Both A and B are valid. 4.Neither one is valid.