21st Century Astronomy (fifth Edition)
5th Edition
ISBN: 9780393603330
Author: Laura Kay, Stacy Palen, George Blumenthal
Publisher: W. W. Norton & Company
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Chapter 5.3, Problem 5.4CYU
To determine
The fastest approaching object in the given values of Doppler shift.
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Page 22 of 24
Question 22 (
If the Mach number is 2.2 and the speed of an airplane measured by radar is 2115 km/h, what is the local speed of
sound and the temperature of air?
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On December 26, 2004, a great earthquake occurred off the coast of Sumatra and triggered immense waves (tsunami) that killed some 200000 people. Satellites observing these waves from space measured 800 km from one wave crest to the next and a period between waves of 1.0 hour. The speed of the waves were 800 km/h. How does the speed of the wave help you understand why the waves caused such devastation?
1. A person holds a rifle horizontally and fires at a target. The bullet has a
muzzle speed of 180 m/s, and the person hears the bullet strike the target
1.20 s after firing it. The air temperature is 81°F. What is the distance to
the target?
m
Chapter 5 Solutions
21st Century Astronomy (fifth Edition)
Ch. 5.1 - Prob. 5.1CYUCh. 5.1 - Prob. 5.2CYUCh. 5.2 - Prob. 5.3CYUCh. 5.3 - Prob. 5.4CYUCh. 5.4 - Prob. 5.5CYUCh. 5.5 - Prob. 5.6CYUCh. 5 - Prob. 1QPCh. 5 - Prob. 2QPCh. 5 - Prob. 3QPCh. 5 - Prob. 4QP
Ch. 5 - Prob. 5QPCh. 5 - Prob. 6QPCh. 5 - Prob. 7QPCh. 5 - Prob. 8QPCh. 5 - Prob. 9QPCh. 5 - Prob. 10QPCh. 5 - Prob. 11QPCh. 5 - Prob. 12QPCh. 5 - Prob. 13QPCh. 5 - Prob. 14QPCh. 5 - Prob. 15QPCh. 5 - Prob. 16QPCh. 5 - Prob. 17QPCh. 5 - Prob. 18QPCh. 5 - Prob. 19QPCh. 5 - Prob. 20QPCh. 5 - Prob. 21QPCh. 5 - Prob. 22QPCh. 5 - Prob. 23QPCh. 5 - Prob. 24QPCh. 5 - Prob. 25QPCh. 5 - Prob. 26QPCh. 5 - Prob. 27QPCh. 5 - Prob. 28QPCh. 5 - Prob. 29QPCh. 5 - Prob. 30QPCh. 5 - Prob. 31QPCh. 5 - Prob. 32QPCh. 5 - Prob. 33QPCh. 5 - Prob. 34QPCh. 5 - Prob. 35QPCh. 5 - Prob. 36QPCh. 5 - Prob. 37QPCh. 5 - Prob. 38QPCh. 5 - Prob. 39QPCh. 5 - Prob. 40QPCh. 5 - Prob. 41QPCh. 5 - Prob. 42QPCh. 5 - Prob. 43QPCh. 5 - Prob. 44QPCh. 5 - Prob. 45QP
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- During a thunderstorm, a frightened child is soothed by learning to estimate the distance to a lightning strike by counting the time between seeing the lightning and hearing the thunder (Fig. P2.25). The speed vs of sound in air depends on the air temperature, but assume the value is 343 m/s. The speed of light c is 3.00 108 m/s. a. A child sees the lightning and then counts to eight slowly before hearing the thunder. Assume the light travel time is negligible. Estimate the distance to the lightning strike. b. Using your estimate in part (a), find the light travel time. Is it fair to neglect the light travel time? c. Think about how time was measured in this problem. Is it fair to neglect the difference between the speed of sound in cold air (vs at 0C = 331.4 m/s) and the speed of sound in very warm air (vs at 40C = 355.4 m/s)?arrow_forwardWind gusts create ripples on the ocean that have a wavelength at 5.00 cm and propagate at 2.00m/s. What is their frequency?arrow_forwardGiven that x = A cos (t) is a sinusoidal function of time, show that v (velocity) and a (acceleration) are also sinusoidal functions of time. Hint: Use Equations 13.6 and 13.2.arrow_forward
- = 424 m away. How long (in s) until the dolphin hears an echo? Assume the water temperature is 25°C, and While floating in the ocean, a dolphin emits a sound wave directed toward the hull of an ocean liner d the speed of sound in the water is 1,533 m/s. Sarrow_forwardMy heart beats 124 times in two minutes. Determine the frequency of my heartbeat. O 2.0 Hz O 0.48 Hz O 1.03 Hz O None of the abovearrow_forward30. A man drops a rock into a well and he hears the splash 3.00 seconds later. If the air temperature is 27°C, how far below the top of the well is the surface of the water? Assume that the speed of sound is constant, and you may ignore the effects of air resistance.arrow_forward
- Question 2 If the speed of sound in air at 0 °C is 331 m/s. What will be the speed of sound in air at 50 °C? 299 m/s 142 m/s 331 m/s 360 m/s None of these. A Moving to another question will ave this response. ch 45arrow_forwardA stone is dropped in to a well 44.1 m deep. After how much time the sound will be heard if the velocity of sound is 330 m/s 83. (a) 6 sec (b) 3.13 sec (c) 6.26 sec (d) 1.56 secarrow_forwardThe speed (v) at which sound travels through air is dependent upon the temperature of the air and seems to follow the equation v = 331 m/s + 0.6 m/s/°C * T where T is the Celsius temperature of the air. Determine the speed of sound …a. … on a cold day when the outdoor temperature is 4°C.b. … inside the school where the temperature is 24°C.c. … on a warm day when the outdoor temperature is 38°C.arrow_forward
- You are on a boat in a fog and know there are cliffs ahead of you somewhere, but you cannot see them. You use your fog horn to send out a blast of sound (temperature of air is 32 oC) and the time it takes for the sound to return to you is 20.0 s. How far away are the cliffs?arrow_forwardAn entrant enters a model car into a race. The car accelerates from rest at a constant rate of 2m/s^2 down a slope. When it crosses the finishing line a firework is set off at the end of the course. The sound travels at 340m/s. The time between the entrant starting and the firework being heard at the start of the course is 12s. a) Find the length of the course. b) find the actual time it took for the model car to complete the course.arrow_forwarda bat can detect small objects such as an insect whose size is approximately equal to one wavelength of the sound the bat makes. if bats emit a chirp at a frequency of 20.2 kHz and the speed of sound in air is 323 m/s, what is the smallest insect a bat can detect? answer in units of mmarrow_forward
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