Because the person in back of the ambulance will hear a lower frequency of the siren. This is because the waves are stretched out. A longer wavelength results in a lower frequency.

5 0

2 years ago

Read 2 more answers

Miles is camping in Glacier National Park. In the midst of a glacier canyon,

valentina_108 [34]

Answer:

t=1.623 sec

Explanation:

The distance traveled before the echo is had is:

$distance=2d, d=280\ m\\\\=280\times 2\\\\=560 \ m$

Given the speed of sound as v=345m/s, we use the speed equation to solve for t:

$v=\frac{d}{t}\\\\345\ m/s=\frac{560m}{t}\\\\t=\frac{560}{360}\\\\=1.623 \ s$

Hence, it takes 1.623 seconds to hear the echo.

8 0

2 years ago

On a roller coaster ride at an amusement park, a car travels from 7.6 m/s to 56 m/s in 3 seconds. whats the cars acceleration?

nataly862011 [7]

Acceleration is defined as rate of change in velocity

So we can write its formula as

$a = \frac{v_f - v_i}{t}$

here we know that

$v_f$ = final velocity = 56 m/s

$v_i$ = initial velocity = 7.6 m/s

t = time interval to change the velocity = 3 s

now we will plug in all values in the above equation

$a = \frac{56 - 7.6}{3}$

$a = \frac{48.4}{3}$

$a = 16.13 m/s^2$

so here roller coaster will accelerate at rate of 16 m/s^2 and hence correct answer is "option d"

3 0

2 years ago