A whistle you use to call your hunting dog has a frequency of 21 kHz, but your dog is ignoring it. You suspect the whistle may n
ot be working, but you can't hear sounds above 20 kHz. To test it, you ask a friend to blow the whistle, then you hop on your bicycle.
1 answer:
Answer:
minimum speed to know if the whistle is working = 16.33m/s
Explanation:
Speed of sound, v= 343m/s
Hearing frequency of dog, f= 21kHz
Hearing Frequency of man, fₐ= 20kHz
Minimum travel speed, vₐ=?
Using the formula;
fₐ=(1-vₐ/v)f
20=(1-vₐ/343)21
(1-vₐ/343)=20/21
vₐ/343=1-0.9524
vₐ=0.0476*343
vₐ=16.33m/s
You might be interested in
Answer:
¿Se comprometió Roberto con Susana?
O Sí, desean casarse en verano. <-----
O Roberto le trajo una botella de vino.
The answer is I'm going fishing in the lake. How it will be?
Answer:
1. instales
2.Acerquen
3. esten
4. Tradusca
5. coloques
6.cargues
7.diga
8. conozca
9. practiques
10. des
Explanation:
Answer and Explanation:
- 1. La mochila tiene <u>un bolígrafo.</u>
- 2. El salón de clase no hay <u>un café.</u>
- 3. La estudiante no quiere <u>el libro.</u>
- 4. En la clase el profesor no dice: <u>¡Escuchen la radio!</u>
- 5. En el salón de clase no hay <u>un día.</u>
Translation:
- 1. The backpack has <u>a pen.</u>
- 2. The classroom doesn't have <u>a cafe.</u>
- 3. The student doesn't want <u>the book.</u>
- 4. In class the teacher doesn't say: <u>Listen to the radio!</u>
- 5. In the classroom there isn't <u>a day.</u>
Greetings.
Answer:
yo vivo
el vive
tu vives
nosotros vivimos
ellos viven
