When two adjacent lights blink on and off in quick succession, we perceive a single light moving back and forth between them. th
1 answer:
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Answer:
Explanation:
Let the velocity of observer the driver be V₀ and the velocity of police car the source be. Let V be the velocity of sound in air.
The apparent frequency f is given by the following relation
F is real frequency.
Now F = 2600,
Putting these values in the equation
f = 3146 Hz.
b ) After the police passes , the sign of velocity of observer and source get reversed.
f = 2175 Hz
c ) When the police car is also going northward and trying to overtaking the driver the frequency is calculated as follows .
f = 2799 Hz
When the policy car already crosses the drives the frequency will be as follows
f = 2445 Hz
Answer:
(c)Tension = 162 N
(d) Increase
Explanation:
(c)
In order for the cable to lift the plate at uniform velocity, the tension in the cable must be equal to the weight of the plate.
<u>Tension = 162 N</u>
(d)
The tension with upward acceleration will become:
<u>Hence, the tension will increase by an amount equal to "ma".</u>