Ask question

Ask question

All categories

nataly862011 [7]

2 years ago

14

A boy drops a 0.10 kg stone down a 150 m well and listens for the echo. The air temperature is 20°C. How long after the stone is

dropped will the boy hear the echo? The speed of sound through air at 20°C is v = 343 m/s.

1 answer:

S_A_V [24]2 years ago

4 0

Use formula for Echo which is Velocity=2(Distance)/time so 343=2(150)/T 343T=300..T=300/343=0.9 seconds

You might be interested in

The heater element of a 120 V toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. The resistivity of nichrome

Ksenya-84 [330]

Answer:

The power drawn by the toaster is closest to:

(A) 370 W

Explanation:

First we calculate the resistance of the nichrome wire (R).

$R=\frac{pL}{A} =\frac{pL}{\pi r^{2} } \\$

Where radious (r), resistance coefficient (p), and Length (L)

$r=\frac{0.48}{2} 10^{-3} m\\\\L=5.4 m\\p=1.3*10^{-3}\varOmega \\\\\\Replacing:\\\\R=\frac{1.3(10)^{-6} *5.4}{\pi* 0.24^{2} (10)^{-6}} =38.7940$

After replace the value in the ohm law power formula to obtain the power consumed:

$P=\frac{V^2}{R} =\frac{120^2}{38.7940} =371.191 Watts$

7 0

2 years ago

puteri [66]

Answer:

The answer is proteins

4 0

2 years ago

Help fast!!! I thought I understood but I don’t

cricket20 [7]

The awnswer is c give me brainlest!!!

8 0

2 years ago

Uncle Harry weighs 750 N. What is his mass in kg?

Elenna [48]

Answer:

W = MG

750 = M * 10

M = 750/10

M = 75 kg

8 0

2 years ago

Read 2 more answers

What is different about the colors of the spectrum?

ankoles [38]

The human eye is not capable of seeing radiation wavelengths outside the visible Spectrum, i hope this answers your question :)

7 0

2 years ago