Find the frequencies of the first three harmonics of a 1.0-m long string which has a mass per unit length of 2.0 × 10^-3 kg/m and a tension of 80 N when both ends are fixed in place
100 Hz, 200 Hz, 300 Hz
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Compound Microscope: A compound microscope has a 18-cm-long barrel and an objective lens with a focal length of 8.0 mm. What is the focal length of the eyepiece to give a total magnification of 240? It is adjusted for minimum eyestrain for persons with a near point of 25 cm.
A. 1.3 m B. 1.5 cm C. 1.9 cm D. 2.1 cm E. 2.3 cm
Two identical small charged spheres are a certain distance apart, and each one initially experiences an electrostatic force of magnitude F due to the other
With time, charge gradually leaks off of both spheres. When each of the spheres has lost half its initial charge, the magnitude of the electrostatic force will be A) 1/4 F. B) 1/8 F. C) 1/2 F. D) 1/16 F.
A useful instrument that makes use of the wavelike properties of electrons is the electron ______________
Fill in the blank(s) with correct word
A chunk of ice (T = -20°C) is added to a thermally insulated container of cold water (T = 0°C). What happens in the container?
A) The ice melts until thermal equilibrium is established. B) The water cools down until thermal equilibrium is established. C) Some of the water freezes and the chunk of ice gets larger. D) none of the above