Answer:
V = a * t = 9.8 m/s^2 * 2.3 s = 22.5 m/s velocity after 2.3 s
S = 1/2 g t^2 since initial speed is zero
S = 1/2 * 9.8 m/s^2 * 5.29 s^2 = 25.9 m
The two ways to determine whether a bar of metal was magnetized or not
are the following:
<span>1.
</span>Rubbing the bar of
metal with a strong magnet.
Find the north pole of the magnet then rub it on
the middle part of the metal to the end. The act of rubbing the magnet several times across the metal
helps the iron atoms (present in the metal) align in one direction. Then test
the magnetism by tapping the metal against a pile of paperclips. If the
paperclip stick, then the metal was magnetized.
<span>2.
</span>Striking the bar of
metal with a hammer.
Position the bar of metal facing north using a compass. Use
a strong tape to secure it on the flat table. Strike the south part of the
metal with a hammer several times. Striking the metal allows the iron atoms to align themselves
in the direction of the Earth’s magnetic field. Then, test the magnetism
of the metal.
Remember that a metal which contain the most iron will become more magnetic and an object is a magnet
if it repels a known magnet.
Power in most circuits could be analysed and broken down into two categories
-Power dissipated by resistive components
-Power delivered by the electrical sources.
If you are working with Alternate current (AC) sources, the analysis of the power consumed in the circuit will deal with complex numbers and the introduction of new terms such as active, reactive and apparent power.
All this depending on the frequency and the components used in the circuit.
A. K20 is the correct answrr