Map sapling learning Trance music often relies on a DJ playing two records at th
ID: 1367259 • Letter: M
Question
Map sapling learning Trance music often relies on a DJ playing two records at the same time. The basic time signatures of the two records must match, however, otherwise the two records will play "out of synch." Turntable A Turntable B A DJ is playing an Armin van Buuren record on Turntable A at a typical 33.3 rpm, while a Blank & Jones record rests motionless on Turntable B. At a given time, he turns on one record and turns off the other. Tt 33.3 rpm 0 rpm If the Armin van Buuren record rotationally decelerates at one-sixth the rate of rotational acceleration of the Blank & Jones record, at what rotational speed will the two turntables match when they finally "synch? Number 28.54 rpm If this process took 3.55 seconds, how many revolutions would the Armin van Buuren record sweep? Number 80.451 rev Incorrect Exit O Previous Give Up & View Solution # Try Again O Next Explanation
Explanation / Answer
a)
Since acceleration is 6 times the decelaration.so A decelerates at a rate of 1/7.angular velocity of B at which both turntables sync is
WB=(1-1/7)*33.3
WB=28.54 rpm
b)
1 rpm = (1/60) rev/s
angular displacement
x=Wt =(28.54/60)*3.55
X=1.69 rev