An object of mass 25 kg acted upon by a net force of 10 N will experience an acceleration of?
1 answer:
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Answer:
t = 25.5 min
Explanation:
To know how many minutes does Richard save, you first calculate the time that Richard takes with both velocities v1 = 65mph and v2 = 80mph.
Next, you calculate the difference between both times t1 and t2:
This is the time that Richard saves when he drives with a speed of 80mph. Finally, you convert the result to minutes:
hence, Richard saves 25.5 min (25 min and 30 s) when he drives with a speed of 80mph
Answer:
631.7 Hz
Explanation:
The Doppler effect is a phenomenon that occurs when there is relative motion between an observer and a source of a wave. When this occurs, the is a change in the apparent frequency of the wave, as observed by the observer.
In particular, the new apparent frequency can be calculated as:
where
f is the real frequency
f' is the apparent frequency
v is the speed of the wave
is the velocity of the observer (positive if the observer is moving towards the source, negative if moving away)
is the velocity of the source (negative if the source is moving towards the observer, positive if moving away)
In this problem:
v = 340.6 m/s is the speed of the sound wave
f = 600 Hz is the real frequency of the sound
is the velocity of the person
is the velocity of the source
Substituting, we find: