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Chapter 11: Q5Q (page 292)
You measure the radius of a wheel to be 4.16 cm. If you multiply it by 2 to get the diameter, should you write the result as 8 cm or as 8.32 cm? Justify your answer.
The diameter of the wheel is 8.32 cm.
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What is the ratio of (a) the intensities, and (b) the amplitudes, of an earthquake P wave passing through the Earth and detected at two points 15 km and 45 km from the source?
A standard baseball has a circumference of approximately 23 cm. If a baseball had the same mass per unit volume (see Tables in section 1鈥�5) as a neutron or a proton, about what would its mass be?
If a violin string vibrates at 440 Hz as its fundamental frequency, what are the frequencies of the first four harmonics?
A sound wave is traveling in warm air when it hits a layer of cold, dense air. If the sound wave hits the cold air interface at an angle of\(25^\circ \), what is the angle of refraction? Assume that the cold air temperature is\( - 15^\circ {\rm{C}}\)and the warm air temperature is\( + 15^\circ {\rm{C}}\). The speed of sound as a function of temperature can be approximated by\(v = \left( {331 + 0.60T} \right)\;{\rm{m/s}}\)where\(T\)is in\(^\circ {\rm{C}}\).
Two children are sending signals along a cord of total mass 0.50 kg tied between tin cans with a tension of 35 N. It takes the vibrations in the string 0.55 s to go from one child to the other. How far apart are the children?
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