A motion detector measures distance to the nearest object by using a speaker and a microphone....
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
A motion detector measures distance to the nearest object by using a speaker and a microphone. The speaker clicks 30 times a second. The microphone detects the sound bouncing back from the nearest object in front of it. The computer calculates the time delay between the making of the sound and receiving the echo. It knows the speed of sound (about 343 m/s at room temperature) and from that, it can calculate the distance to the object from the time delay. A. If the nearest object in front of the detector is too far away, the echo will not get back before a second click is emitted. Once that happens, the computer has no way of knowing that the echo isn't an echo from the second click and the detector doesn't give correct results anymore. Once the speaker emits a click, how much time does the echo have to return to the microphone before the next click is emitted? What's the furthest away the object can be so that the echo returns before the next click is emitted? (Give your answer to three significant figures.) m B. The speed of sound changes a little bit with temperature. Let's try to get an idea of how important this is. At room temperature (72F) the speed of sound is about 343 m/s. At 62F it about 1% smaller. is Suppose we are measuring an object that is really 1.5 meters away at 72F. What is the time delay At that the computer detects before the echo returns? Now suppose the temperature is 62F. If the computer detects a time delay of At but (because it doesn't know the temperature) calculates the distance using the speed of sound appropriate for 72F, how far away would the computer report the object is? (Give your answer to 3 significant figures.) m C. In the box below, explain your reasoning for parts A and B. A motion detector measures distance to the nearest object by using a speaker and a microphone. The speaker clicks 30 times a second. The microphone detects the sound bouncing back from the nearest object in front of it. The computer calculates the time delay between the making of the sound and receiving the echo. It knows the speed of sound (about 343 m/s at room temperature) and from that, it can calculate the distance to the object from the time delay. A. If the nearest object in front of the detector is too far away, the echo will not get back before a second click is emitted. Once that happens, the computer has no way of knowing that the echo isn't an echo from the second click and the detector doesn't give correct results anymore. Once the speaker emits a click, how much time does the echo have to return to the microphone before the next click is emitted? What's the furthest away the object can be so that the echo returns before the next click is emitted? (Give your answer to three significant figures.) m B. The speed of sound changes a little bit with temperature. Let's try to get an idea of how important this is. At room temperature (72F) the speed of sound is about 343 m/s. At 62F it about 1% smaller. is Suppose we are measuring an object that is really 1.5 meters away at 72F. What is the time delay At that the computer detects before the echo returns? Now suppose the temperature is 62F. If the computer detects a time delay of At but (because it doesn't know the temperature) calculates the distance using the speed of sound appropriate for 72F, how far away would the computer report the object is? (Give your answer to 3 significant figures.) m C. In the box below, explain your reasoning for parts A and B.
Expert Answer:
Related Book For
Posted Date:
Students also viewed these physics questions
-
Planning is one of the most important management functions in any business. A front office managers first step in planning should involve determine the departments goals. Planning also includes...
-
Managing Scope Changes Case Study Scope changes on a project can occur regardless of how well the project is planned or executed. Scope changes can be the result of something that was omitted during...
-
Upton Computers makes bulk purchases of small computers, stocks them in conveniently located warehouses, ships them to its chain of retail stores, and has a staff to advise customers and help them...
-
Show that if E is closed in R" and a E, then inf lx - all>0 XEE
-
When a steel cable supports a heavy load of weight W, its length increases by an amount L compared with its length without a load. Suppose the cable is cut into three equal pieces, and the three...
-
Using information provided in Table C.1, develop a table of speed of sound in ft/s as a function of elevation for U.S. standard atmosphere. Table C.1 Properties of the U.S. Standard Atmosphere (BG/EE...
-
The Association of Women in Government established an Educational Foundation to raise money to support scholarship and other education initiatives. The Educational Foundation is a private...
-
P = 7 kN, w = 12 KN/m and angle is 32 deg Equilibrium and support reactions for beams and frames Question 2a [25 marks] Show that the following beam is statically determinate. Determine the external...
-
Accounting 9/45 This should be prepared in a Word document with embedded Excel spreadsheets for relevant calculations and supporting schedules. You still need to post your Excel worksheet to show...
-
John Henry died on May 1, 2018. When does his final 1040 have to be filed?
-
Because John was so happy that Dana had agreed to become his fiancee, on February 2, 2018, he gave Dana's mother, Ethel, \(\$ 15,000\) in cash. a. Does this gift qualify for gift-splitting? b. Does...
-
In 2018, Mr. Colburn created a trust for the benefit of his five adult children and transferred \(\$ 300,000\) to it. The trustee may decide how much income to pay to each child each year. The trust...
-
Some stock in a calendar-year \(S\) corporation is sold to a nonresident alien on February 13, 2018. On what date is the corporation's status as an \(S\) corporation terminated?
-
During 2018, Alec Meachin earned a net profit of \(\$ 80,000\) from his sole proprietorship (as reported on Schedule C). He paid \(\$ 10,000\) self-employment taxes during the year. What is the...
-
On January 1, 2016, Pistachio purchased an asset that had an estimated residual value of $700 after an economic life of four years. Pistachio used sum-of-the-years'-digits depreciation and recorded...
-
On January 1, 2018, Khalid Ltd., which follows IAS 17, entered into an eight-year lease agreement for three dryers. Annual lease payments for the equipment are $28,500 at the beginning of each lease...
-
At December 31, 2025, the fair value of non-trading securities is 41,300 and the cost is 39,800. At January 1, 2025, there was a credit balance of 900 in the Fair Value Adjustment Non-Trading...
-
On January 1, 2025, Lennon Enterprises acquires 100% of Ono Ltd. for 220,000 in cash. The condensed statements of financial position of the two companies immediately following the acquisition are as...
-
Which of the following will not be reported in the statement of cash flows? a. The net change in plant assets during the year. b. Cash payments for plant assets during the year. c. Cash receipts from...
Study smarter with the SolutionInn App