A flat rectangular coil with dimensions of 8.0 cm × 10 cm is dropped from a zero magnetic field position into a 1.4-T magnetic field in 0.10 s
The coil has 60 turns and is perpendicular to the magnetic field. What is the average induced emf in the coil as a result of this action?
A) 8.6 V
B) 2.4 V
C) 6.7 V
D) 3.6 V
E) 0 V
C
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Equilibrium: A 120-kg refrigerator that is 2.0 m tall and 85 cm wide has its center of mass at its geometrical center. You are attempting to slide it along the floor by pushing horizontally on the side of the refrigerator. The coefficient of static friction between the floor and the refrigerator is 0.30. Depending on where you push, the refrigerator may start to tip over before it starts to slide along the floor. What is the highest distance above the floor that you can push the refrigerator so that it will not tip before it begins to slide?
A. 0.71 m B. 1.0 m C. 1.2 m D. 1.4 m E. 1.6 m
Two thin lenses with 6.80-cm focal lengths at are mounted at opposite ends of a 18.8-cm long tube. An object is located 20.4 cm from one end of the tube. How far from the opposite end is the final image?
a. 8.88 cm b. 32.5 cm c. 4.54 cm d. 8.60 cm e. 20.4 cm
Which of the following observations would not be likely to provide information about the final, explosive stages of a star's life?
A) studying the light rings around Supernova 1987A in the Large Magellanic Cloud B) decades of continuous monitoring of red giants in a globular cluster C) observing the structures of planetary nebulae D) neutrino detections from nearby supernovae
Suppose that hydrogen, rather than iron, had the lowest mass per nuclear particle. Which of the following would be true?
A) Stars would be brighter. B) Stars would be less massive. C) All stars would be red giants. D) Nuclear fusion could not power stars.