Answer:
Explanation:
The former is the case of constructive interference and the later case relates to destructive interference.
For listener, path difference is the separation of loudspeaker as listener is not standing in between the speaker.
If λ be the wave length
For constructive interference
19 = n λ
For destructive interference
29 = (2n+1) λ / 2
= n λ + λ / 2
= 19 + λ / 2
10 = λ / 2
λ = 20 cm
= 0. 20 m
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Time = (displacement) / (magnitude of average velocity) .
The uncertainty of the measurement is 0.001 gm.
The uncertainty in the measurement of a physical quantity is given as how precisely we can measure that, in this case as we can see that the mass of the sodium chloride is precisely given as 29.732 gm, this means the electronic scale is precise to 0.001 gm and round of the values after that which means there is a uncertainty of 0.001 gm.
Answer: He must drive at 58.8mi/hr
{3 significant figure}
Explanation: The original speed of the car to complete the journey normally is = 550mile/10hr
= 55mi/hr
The normal time to cover 120 mile with that speed is
t = distance/speed
= 120/55
=2hr, 0.18*60=11mins
= 2hr11mins.
But the driver found out he was 30mins behind at this distance, so he spent
2hr 11min +30min= 2hr41mins
For him to meet up the original schedule time 10hrs, he has
(10-2.41)hrs = 7hr19mins to cover the remaining distance of
{550-120}=430mile.
First, 7hr19mins= {7*(19/60)}hr
= {439/60}hr
Now let's find the speed at which the driver must move for him to cover for his initial delay
Speed= distance/time
= 430/{439/60}
This is same as writing
Speed = 430/439/60
Using the law of reciprocal,
Speed = (430*60)/439
= 25800/439
= 58.7699mi/hr
But we were asked to leave our answer in 3 significant figure. Therefore,
Speed = 58.8mi/hr
Answer: The focus is the place inside Earth's crust where an earthquake originates. The point on the Earth's surface directly above the focus is the epicenter. The epicenter is the point on the surface above the focus, the place on the surface that would receive the most intense vibrations.
Explanation: Hope it helps <3