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2 answers:
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Given that,
Output power = 87 W
Decibel reading = 120 dB
We need to calculate the intensity of sound
Using formula of intensity of sound
Put the value into the formula
We need to calculate the distance
Using relation of power out[ut and intensity
Put the value into the formula
Hence, The distance is 2.63 m
Answer:
t = 3.52 s
Explanation:
Given that,
The deceleration of a car is, a = -1.7 m/s²
The initial velocity of the car, u = 15 m/s
Final velocity of the car, v = 9 m/s
We need to find the time that is required to slow the car from 15 m/s to 9 m/s. The definition of acceleration is :
So, it will take 3.52 seconds to slow the car from 15 m/s to 9 m/s.