PHY Mod 5- Chapters 10 & 11 Exercises & Problems

Chapter 10: Numbers 44, 52, 54, 58, 66, 76, 80, 82, 94, 96, 108 (pages 280-283)44. A nurse counts 72 heartbeats in 1 min. Show that the frequency and period of the heartbeatsare 1.2 Hz and 0.83 s, respectively.52. An oceanic depth-sounding vessel surveys the ocean bottom with ultrasonic waves that travelat 1530 m/s in seawater. Show that when the time delay of an echo to the ocean floor below is 4s,the depth of the water is 3060 m54. Susie hammers on a block of wood when she is 85 m from a large brick wall. Each time shehits the block, she hears an echo 0.5 s later. With this information, show that the speed of soundis 340 m/s.58. What beat frequencies are possible with tuning forks of frequencies 256, 259, and 261 Hz?66. A student that youre tutoring says that the two terms wave speed and wave frequency refer tothe same thing. What is your response?76. If the Moon blew up, why wouldnt we hear the sound?80. In an Olympic competition, a microphone detects the sound of the starters gun, which is sentelectronically to speakers at every runners starting block. Why?82. What two physics mistakes occur in a science-fiction movie that shows a distant explosion inouter space that you see and hear at the same time?94. How does the Doppler effect aid police in detecting speeding motorists?96. Astronomers find that light emitted by a particular element at one edge of the Sun has aslightly higher frequency than light from that element at the opposite edge. What do thesemeasurements tell us about the Suns motion?108. A rule of thumb for estimating the distance in kilometers between an observer and alightning stroke is to divide the number of seconds in the interval between the flash and thesound by 3. Discuss whether or not this rule is correct.CH. 11 Chapter 11: Numbers 38, 46, 54, 60, 68, 76, 80, 92, 96 (pages 310-312)38. Electrons on a radio broadcasting tower are forced to oscillate up and down an antenna535,000 times each second. Show that the wavelength of the radio waves that are produced is561 m.46. When you walk toward a mirror you see your image approaching you. If you walk at 2 m/s,how fast do you and your image approach each other?54. What is it, exactly, that waves in a light wave?60. What do radio waves and light have in common? What is different about them?68. Trucks often have signs on the back that say, If you cant see my mirrors, I cant see you.Explain the physics.76. During a lunar eclipse, the Moon is not completely dark, but is often deep red. Explain this interms of the refraction of all the sunsets and sunrises around the world.80. What colors of ink do color ink-jet printers use to produce a full range of colors? Do thecolors form by color addition or by color subtraction?92. A rainbow viewed from an airplane may form a complete circle. Where will the shadow ofthe airplane appear? Explain.96. In a physics study group, a friend says in a profound tone that light is the only thing we cansee. After a few laughs, your friend goes on to say that light is produced by the connectionbetween electricity and magnetism. Is your friend correct?