Direct current is the unidirectional flow of an electric charge.
The term 'unidirectional' in the statement means that direct current only moves in one direction. Direct current usually produced by things such as batteries, dynamos, and power supplies
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Answer:
a) v = 5.88 m/s
b) v = 11.76 m/s
c) s = 1.764 m
d) s = 7.056 m
Explanation:
Given,
The initial velocity of the steel ball, u = o
The acceleration due to gravity, g = 9.8 m/s²
The equations of motion to find the final velocity for a body under free fall with an initial velocity, u = 0 is
v = u + at m/s
v = at m/s
a) At time t = 0.6 s
v = 9.8 x 0.6
= 5.88 m/s
The velocity of the ball 0.6 seconds after its release is, v = 5.88 m/s
b) At t = 1.2 s
v = 9.8 x 1.2
= 11.76 m/s
The velocity of the ball 1.2 seconds after its release is, v = 11.76 m/s
The distance traveled by the free falling body is given by the formula
s = ut + 1/2 at² m
s = 1/2 at² ∵ u = 0
c) At, t = 0.6 s
s = 1/2 x 9.8 x 0.6²
= 1.764 m
The distance ball fall in the first 0.6 seconds of its flight is, s = 1.764 m
d) At, t = 1.2 s
s = 1/2 x 9.8 x 1.2²
= 7.056 m
The distance ball fall in the first 1.2 seconds of its flight is, s = 7.056 m
Answer:
D
Explanation:
Since Ball X accelerates at 8m/s2, its acceleration will be doubled. A faster acceleration means the least mass.
Answer:
D. It has a low resistance and allows charges to move freely.
Explanation:
The high conductivity of copper allow charges to move freely without the need of too much force. The conductivity decreases with increase in resistance. Low resistance also means less heating of the conductors. This property of copper makes it ideal for use in the manufacture of electric cables and conductors for various gadgets.
