Answer:
19.12 m/s.
Explanation:
The following data were obtained from the question:
Final velocity (v) = 0 m/s
Breaking Acceleration (a) = – 4.57 m/s²
Distance (s) = 40 m
Initial velocity (u) =.?
The initial velocity of the car can be obtained as illustrated below:
v² = u² + 2as
0² = u² + (2 × –4.57 × 40)
0 = u² + (– 365.6)
0 = u² – 365.6
Collect like terms
u² = 0 + 365.6
u² = 365.6
Take the square root of both side
u = √365.6
u = 19.12 m/s
Therefore, the car was initially moving at 19.12 m/s.
Answer:
<u>Resistance</u><u> </u><u>is</u><u> </u><u>1</u><u>.</u><u>7</u><u>5</u><u> </u><u>ohms</u>
Explanation:
Magnetic flux:
N is number of turns, N = 8
B is magnetic flux
A is area of projection.
From faradays law:
where E is the Electro motive force.
But E = IR
where I is current and R is resistance:
I believe it's true.Hope this helps.
When electrons are lost a positive ion is formed. When electrons are gained, a negative ion is formed. I hope this helps