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The Heat added to the system
The switches could be defective or worn out or the wires at the switch connections could be loose, causing arcing that is making the noises. There is probably nothing wrong with your basic wiring. ... The safest course is to replace any switch that is making unusual noises such as hissing, crackling and popping
Answer:
D
Explanation:
On an inclination of 30°, the acceleration down the inclination will be gsinФ. So the acceleration will be ⇒
g Sin30° = (0.50) g
Fnet = mass × acceleration
Fpush (force by the boys) - 40 = (30)(1.5)
Fpush - 40 = 45
Fpush = 45 + 40
Fpush = 85 N
So, the boys are exerting a force of 85 N on the bicycle.