Compound Microscope: The focal lengths of the objective lens and the eyepiece in a microscope are 0.29 cm and 2.50 cm, respectively. An object is placed at 0.30 cm from the objective lens and the image of this object is viewed with the eyepiece adjusted for minimum eyestrain for persons with a near point of 25 cm. The magnitude of the final overall magnification of the microscope is closest to
A. 100
B. 200
C. 300
D. 410
E. 500
Answer: C
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Ocean waves with a wavelength of 120 m are coming in at a rate of 8 per minute. What is their speed?
A. 8.0 m/s B. 16 m/s C. 24 m/s D. 30 m/s E. 4.0 m/s
Velma is in a train headed north past Mort at 30 m/s. Velma has a slingshot that can shoot pebbles at 40 m/s. Velma shoots a pebble toward the rear of the train. Mort observes the pebble's velocity to be
A) 70 m/s north. B) 70 m/s south. C) 40 m/s south. D) 10 m/s south. E) 10 m/s north.
A steel piano string is attached, under tension, at each end to secure posts. When gently struck, a faint note can be detected coming from the string. The string is then cooled by blowing cold air over it and then is struck again. How does the note now detected compare to the previous one
a. It is the same since the posts don't move. b. It is at a higher frequency than the original one. c. It is at a lower frequency than the original one. d. More than one answer is correct.
Faraday's Law: A flat circular coil having 16 turns, each of diameter 20 cm, is in a uniform and steady 0.13-T magnetic field.(a) Find the total magnetic flux through the coil when the field is perpendicular to the plane of the coil.(b) If the coil is rotated in 10 ms so its plane is parallel to the field, find the average induced emf in the coil.
What will be an ideal response?