Answer:
W = Fd = 400(20) = 8000 J
Explanation:
Physical is when something is changed by not changeing its compond like if u melt an ice cube its still that same material and was not changed by something else and and chemical change is when something is changed my acids or changes completly like rusting iron or acid rain and burning stuff
Answer:
Explanation:
check attached image for figure, there is supposed to be a figure for this question containing a distance(height of collar at position A) but i will assume 0.2m or 200mm
Consider the energy equilibrium of the system
Here, F is the force acting on the collar, 
is the height of the collar at position A, m is the mass of the collar C, g is the acceleration due to gravity, 
is the velocity of the collar at position B, and 
is the velocity of the collar at A
Substitute 14.4N for F, 0.2m for , 1.5kg for m, 
for g and 0 for
Therefore, the velocity at which the collar strikes the end B is 4.412m/s
Answer:
<em>clockwise</em>
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Explanation:
when current flows through a ring in a clockwise direction, it produces the equivalent magnetic effect of a southern pole of a magnet on the coil.
Since the current is decreasing, there is a flux change on the lower ring; generating an induced current on the lower ring. According to Lenz law of electromagnetic induction, "the induced current will act in such a way as to oppose the motion or the action producing it". In this case, the induced current will have to be the same polarity to the polarity of the current change producing it so as to repel the two rings far enough to stop the electromagnetic induction. The induced current will then be in the clockwise direction on the lower ring.
