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dem82 [27]
3 years ago
8

Juan is standing on the street. An ambulance moves toward him and then passes by. What best describes the pitch that Juan heats?

(A )the pitch remains constant as the ambulance moves toward and then away from Juan. (B) the pitch increases and decreases in a repeated pattern as the ambulance passes Juan. (C) the pitch drops to a lower pitch once the ambulance passes by Juan. (D) the pitch increases to a higher pitch once the ambulance passes by Juan.
Physics
1 answer:
Artemon [7]3 years ago
7 0

(C) The pitch will drop once the ambulance passes by Juan. The reason for this is because of the doppler effect.

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Answer:

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Phoenix [80]

Answer:

a. t_1=12.5\ s

b. a_2=-13.61\ m.s^{-2}  must be the minimum magnitude of deceleration to avoid hitting the leading car before stopping

c. t_2=2.5714\ s is the time taken to stop after braking

Explanation:

Given:

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  • speed of lagging car, u_{2}=35\ m.s^{-1}
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a.

Time taken by the car to stop:

v_1=u_1+a_1.t_1

where:

v_1=0 , final velocity after braking

t_1= time taken

0=25-2\times t_1

t_1=12.5\ s

b.

using the eq. of motion for the given condition:

v_2^2=u_2^2+2.a_2.\Delta s

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v_2= final velocity of the chasing car after braking = 0

a_2= acceleration of the chasing car after braking

0^2=35^2+2\times a_2\times 45

a_2=-13.61\ m.s^{-2} must be the minimum magnitude of deceleration to avoid hitting the leading car before stopping

c.

time taken by the chasing car to stop:

v_2=u_2+a_2.t_2

0=35-13.61\times t_2

t_2=2.5714\ s  is the time taken to stop after braking

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