The modern first astronomer to propose a heliocentric model for the solar system was ____________________
Fill in the blank(s) with correct word
Copernicus
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Conduction: A heat-conducting rod, 0.90 m long and wrapped in insulation, is made of an aluminum section that is 0.20 m long and a copper section that is 0.70 m long. Both sections have a cross-sectional area of 0.00040 m2. The aluminum end and the copper end are maintained at temperatures of 30°C and 230°C, respectively. The thermal conductivities of aluminum and copper are 205 W/m ? K (aluminum) and 385 W/m ? K (copper). What is the temperature of the aluminum-copper junction in the rod with steady state heat flow?
A. 100°C B. 93°C C. 86°C D. 80°C E. 74°C
Graphical Analysis: The graph in the figure shows the position of a particle as it travels along the x-axis. 
At what value of t is the speed of the particle equal to 0 m/s?
A. 0 s B. 1 s C. 2 s D. 3 s E. 4 s
What is the critical angle for light traveling from crown glass (n = 1.52 ) into water (n = 1.33 )?
A) 42° B) 48° C) 53° D) 57° E) 61°
Two radio antennas are 130 m apart on a north-south line. The two antennas radiate in phase at a frequency of 3.6 MHz. All radio measurements are made far from the antennas
The smallest angle, reckoned east of north from the antennas, at which constructive interference of two radio waves occurs, is closest to: A) 50° B) 55° C) 45° D) 40° E) 35°