When an object is 12 cm in front of a concave mirror, the image is 3.0 cm in front of the mirror? What is the focal length of the mirror?
A) -0.25 cm
B) 15 cm
C) 4.0 cm
D) 2.4 cm
E) -1.3 cm
D
You might also like to view...
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.
What is the sum of 1.53 + 2.786 + 3.3 written with the correct number of significant figures?
A) 8 B) 7.6 C) 7.62 D) 7.616 E) 7.6160
How does Rigel, a bluish star, surface temperature compare to Betelgeuse, a reddish star.
A. Rigel's surface temperature is less than Betelgeuse's. B. Rigel's surface temperature is greater than Betelgeuse's. C. They have the same surface temperature because they are both members of the constellation Orion. D. It is impossible to say without knowledge of the sizes of the stars.
Process of Science: Think about some ways in which we might figure out how old things are that last for much longer than a human lifetime. What about for things that last longer than humans have existed?
What will be an ideal response?