A compound microscope has an objective with a focal length of 3.00 mm and an eyepiece of focal length 6.00 cm. It is adjusted for minimum eyestrain for persons with a near point of 25 cm
If the two lenses are separated by 40.0 cm, what is the total overall magnification?
A) 550 B) 2200 C) 28 D) 56 E) 470
E
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When a spinning ice skater pulls in his arms, he spins faster because
A) his angular momentum must be conserved, so reducing his radius must increase his speed of rotation. B) there is less friction with the air. C) there is less friction with the ice. D) there exists an unbalanced reaction force.
A Carnot engine has an efficiency of 83.0% and performs 4500 J of work every cycle. How much energy is discharged to the lower temperature reservoir every cycle?
A) 922 J B) 833 J C) 744 J D) 3735 J E) 5422 J
Cloud chambers have been replaced by bubble chambers because
A) the radioactive clouds were too dangerous to work with. B) the density of fluids is greater than the density of vapors. C) bubble chambers tend to be larger and more expensive. D) gamma rays are visible in bubble chambers, but not in cloud chambers.
Which of the following is another term for widget?
A. thingamabob B. gidget C. gadget D. sandbox