A concave mirror forms a real image at 25.0 cm from the mirror surface along the principal axis. If the corresponding object is at a 20.0-cm distance, what is the mirror's focal length?
a. 1.43 cm
c. 7.14 cm
b. 16.7 cm
d. 11.1 cm
D
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The current-versus-voltage behavior of a certain electrical device is shown in Figure OQ27.3. When the potential difference across the device is 2 V, what is its resistance?
In a Hertzsprung-Russell (H-R) diagram, a star is represented by a _____ on the graph that tells you its luminosity and temperature
A) cross B) broken line C) point D) dotted line
What is the Trapezium?
A. Four massive stars at the heart of the Orion Nebula B. Three massive stars on the outskirts of the Orion Nebula C. A few hot stars whose ultraviolet light is affecting the formation of other stars D. Both A and C E. Both B and C
Consider a uniform horizontal electric field of 50 N/C directed toward the east. If the electric potential at a given point in the field is 80 V, what is the potential at a point 1.0 m directly east of the point?
A) 30 V B) 90 V C) 15 V D) 130 V