A 10-cm focal length converging lens is used to magnify small newspaper print 2.0 mm high. Calculate the height of the image (in mm) for the maximum magnification for a normal eye
a. 3.5
b. 7.0
c. 9.2
d. 12
e. 2.5
b
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In a long, 30-cm square bar shown in the accompanying sketch, the left face is maintained at 40°C and the top face is maintained at 250°C. The right face is in contact with a fluid at 40°C through a heat transfer coefficient of 60 W/(m2 K) and the bottom face is in contact with a fluid at 250°C through a heat transfer coefficient of 100 W/(m2 K). If the thermal conductivity of the bar is 20 W/(mK), calculate the temperature at the 9 nodes shown in the sketch if the temperature distribution on the top surface of the bar varies sinusoidally from 40°C at the left edge to a maximum of 250°C in the center and back to 40°C at the right edge.
GIVEN
Square bar with one surface at fixed temperature, one surface with a specified temperature
distribution, and two surfaces with convective boundary conditions
FIND
(a) Temperature at 9 shown nodes
SKETCH
When an elevator is accelerating upward, the frequency of a pendulum inside
A) increases. B) decreases. C) doesn't change.
At what minimum speed must a roller coaster be ¬traveling when upside down at the top of a circle so that the passengers do not fall out? Assume a radius of curvature of 7.6 m
What will be an ideal response?
This photo shows the central region of a cluster of galaxies. Based on what you have learned from your text, which of the following statements about this photo is not true?
A) The oldest stars in these galaxies are much older than the oldest stars in our own Milky Way. B) Half for more of the large galaxies we see in this photo are elliptical galaxies. C) Many of the galaxies in this photo have probably suffered collisions in the past. D) These galaxies are held together by their mutual gravitational attraction.