In a transformer, the relationship between the primary and secondary currents depends on all of the following quantities except:
A. the number of turns the primary and secondary windings have
B. the resistance of the windings
C. the voltage in the primary winding
D. the properties of the core material
C. the voltage in the primary winding
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A long solenoid (n = 1 500 turns/m) has a cross-sectional area of 0.40 m2 and a current given by I = (4.0 + 3.0t2) A, where t is in seconds. A flat circular coil (N = 300 turns) with a cross-sectional area of 0.15 m2 is inside and coaxial with the solenoid. What is the magnitude of the emf induced in the coil at t = 2.0 s?
a. 2.7 V b. 1.0 V c. 6.8 V d. 0.68 V e. 1.4 V
Ultraluminous radio sources associated with small visible-light objects are called _______________
Fill in the blank(s) with correct word
How many arc seconds are in a degree?
A) 60 B) 3600 C) 600 D) 86400 E) None; seconds measure time and degrees measure temperature.
What would be the gravitational force that a planet with the same density as Earth and having twice Earth's radius exerts on a 59.1-kg astronaut?
A) 580 N B) 290 N C) 1160 N D) 2320 N E) 1200 N