8 revolutions every minute
1.) Power, P = V²/R = 800²/45 = 4.5 W (A).
2.) Six Resistors in Series.
R = R1 + R2 + R3 + R4 + R5 + R6, Since R is the same, R = 20
R total = 6*20 = 120 (D)
3.) It is the current. Series connection is to evaluate current. (B)
Answer: 10m/s^2
Explanation:
Force acting on couch = 200N
Mass of couch = 20 kg
Acceleration of the couch = ?
Recall that force is the product of the mass of an object by the acceleration by which it moves.
i.e Force = Mass x Acceleration
200N = 20kg x Acceleration
Acceleration = 200N/20kg
Acceleration = 10m/s^2
Thus, the acceleration of the couch is 10m/s^2
Answer: 2.4 watts
Explanation:
Work done by horse = 910J
Time = 380 seconds
Power output of the horse = ?
Recall that power is the rate of doing work. Thus, power is workdone divided by time taken.
i.e Power = (work/time)
Power = 910J/380seconds
Power = 2.395 watts (rounded to two significant figures as 2.4 watts)
Thus, the power output of the horse is 2.4 watts
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