Seal level is rising from global warming. The main cause is
A. expanding sea water
B. melting glaciers
C. expanding rock under the sea
D. contracting earth (while the water stays constant)
Answer: A. expanding sea water
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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
Select the correct equations that show that a freely falling rock drops a distance of 80 m when it falls from rest for 4 s .
A ballerina spins initially at 1.5 revolutions/second when her arms are extended. She then draws in her arms to her body and her moment of inertia becomes 0.88 kg- and her angular speed increases to 4.0 rev/s
Determine her initial moment of inertia.
Dimensional Analysis: The position, x, of an object is given by the equation x = A + Bt + Ct2, where t refers to time. What are the dimensions of A, B, and C?
A. distance, distance, distance B. time, time, time C. distance, time, time2 D. distance, distance/time, distance/time2 E. distance/time, distance/time2, distance/time3