What magnifying power is attained using a compound microscope with the following specifications: objective focal length 1.50 cm, eyepiece focal length 2.42 cm, tube length 16.0 cm? Assume a near point of 25.0 cm and that the microscope is adjusted for an image at infinity.
A. 110
B. 90.0
C. 12.0
D. 11.0
E. 8.00
A. 110
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On a warm 30.°C spring day, you are watching Richard take a buzzer and twirl it horizontally around on the end of a 2.0 meter long string. Why do you hear the buzzer tone Vary from 718. Hz to 772. Hz? What is the angular speed?
What will be an ideal response?
The gravitational red shift is caused by
A) gravitational lensing. B) rotating black holes. C) time dilation. D) Rayleigh scattering in the atmosphere.
The ideal gas model assumes that molecules have infinitesimal size. Consider one molecule bouncing around in the container. As the molecule’s size increases relative to the size of the container, how will the average pressure P that it exerts change, other things being held constant?
A. P increases. B. P does not change. C. P decreases. D. One does not have enough information to say.
A string is stretched with a tension of 100 N. The string has a length of 2.00 meters. The velocity of wave propagation along the string is 220 m/s. The mass of the string is
A. 3.75 gm. B. 4.13 gm. C. 4.66 gm. D. 5.21 gm. E. 5.74 gm.