Answer: the brand of paper towel
Explanation: the independent variable is the one you control in an experiment. the dependent variable would be the amount of water in the paper towel
transformer makes use of mutual induction for its operation in which change in magnetic field in one coil due to variation of current , induces voltage in the other coil. so changing magnetic field in the primary coil is very much needed for the transformer. Alternating current is a current which varies with time , hence it is suitable to produce changing magnetic field in the primary coil. on the other hand , the direct current remains constant all the time. hence can not produce a changing magnetic field. so DC current is not useful for transformers.
Answer:
7.5 m/s²
Explanation:
Given:
v₀ = 0 m/s
v = 30 m/s
t = 4 s
Find: a
v = at + v₀
(30 m/s) = a (4 s) + (0 m/s)
a = 7.5 m/s²
Answer:
16200 J
Explanation:
t = Time the battery is on = 60 hours
I = Current = 
Average voltage
Energy is given by
The energy delivered in the given time is 16200 J
