An airplane moves 140 m/s as it travels around a vertical circular loop which has a 1.0-km radius. What is the magnitude of the resultant force on the 70-kg pilot of this plane at the bottom of this loop?
a. 2.1 kN
b. 1.4 kN
c. 0.69 kN
d. 1.5 kN
e. 1.3 kN
b
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What produces a type-I supernova?
A) the collapse of the core of a massive star B) the helium flash blows apart a giant's core C) mass transfer onto a white dwarf pushing it over 1.4 solar masses D) a nova igniting a helium flash in its red giant companion E) the radioactive decay of nickel 56 into cobalt 56 into iron 56
During the month of January, Earth goes through the point of closest approach to the Sun. Using Kepler's Second law we can conclude that Earth moves faster in January than in July.
Answer the following statement true (T) or false (F)
The experimental data shown tabulated were obtained by passing n-butyl alcohol at a bulk temperature of 15°C over a heated flat plate (0.3-m-long, 0.9-m-wide, surface temperature of 60°C). Correlate the experimental data using appropriate dimensionless numbers and compare the line which best fits the data with Equation 5.38.
GIVEN
n-butyl alcohol flowing over a heated flat plate
Bulk temperature (Tb) = 15°C
Plate surface temperature (Tp) = 60°C
Plate length (L) = 0.3 m
Plate width (w) = 0.9 m
The experimental data given above
FIND
(a) Correlate the data by appropriate dimensionless numbers
(b) Compare line which best fits the data with Equation 5.38
ASSUMPTIONS
Steady state
Alcohol flows parallel to the length of the plate
Plate temperature is uniform
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 19: For n-butyl alcohol at the average of the bulk and surface temperatures
(known as the film temperature): 37.5°C.
We would expect other planets beyond our own solar system to orbit the equators of their home stars, as our own planets orbit the Sun
Indicate whether the statement is true or false