A pressure of 10.0 mm Hg is measured using a constant-volume gas thermometer at a temperature of 50.0°C. What is the pressure (in mm Hg) at the zero-point temperature?
a. 31.8
b. 11.8
c. 8.45
d. 54.6
e. 68.3
c
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Graphical Addition: The sum of two vectors of fixed magnitudes has the greatest magnitude when the angle between these two vectors is
A. 90°. B. 180°. C. 60°. D. 0°. E. 270°.
A 2.00 kg mass is connected to a spring with a spring constant of 6.00 N/m. The displacement is given by the expression x(t) = 12.0 cm sin
What is the maximum velocity the simple harmonic motion?
A. 34.8 cm/s B. 30.7 cm/s C. 25.6 cm/s D. 20.8 cm/s E. 17.5 cm/s
A sphere 0.1-m-diameter is rotating at 20 rpm in a large container of CO2 at atmospheric pressure. If the sphere is at 60°C and the CO2 at 20°C, estimate the rate of heat transfer.
GIVEN
? A rotating sphere in carbon dioxide at atmospheric pressure
? Diameter (D) = 0.1 m
? Speed of rotation (?) = 20 rev/min
? Sphere temperature (Ts) = 60°C
? CO2 temperature (T?) = 20°C
FIND
? The rate of heat transfer
ASSUMPTIONS
? Steady state conditions
? The carbon dioxide is still
? Radiation is negligible
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 28, for CO2 at the mean temperature of 40°C
A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope. The count rate 24 minutes later is 1,000 counts per minute. The half-life of the radioisotope is 8 minutes
a. True b. False Indicate whether the statement is true or false