Geologist is the name of a scientist who studies rocks
Answer: static electricity
Explanation: The movement of charged particles through a wire or other medium is called current or electricity. There is also static electricity, which results from an imbalance or separation of the positive and negative charges on an object. Static electricity is a form of electrical potential energy
I don't think that 4m has anything to do with the problem.
anyway. here.
A___________________B_______C
where A is the point that the train was released.
B is where the wheel started to stick
C is where it stopped
From A to B, v=2.5m/s, it takes 2s to go A to B so t=2
AB= v*t = 2.5 * 2 = 5m
The train comes to a stop 7.7 m from the point at which it was released so AC=7.7m
then BC= AC-AB = 7.7-5 = 2.7m
now consider BC
v^2=u^2+2as
where u is initial speed, in this case is 2.5m/s
v is final speed, train stop at C so final speed=0, so v=0
a is acceleration
s is displacement, which is BC=2.7m
substitute all the number into equation, we have
0^2 = 2.5^2 + 2*a*2.7
0 = 6.25 + 5.4a
a = -6.25/5.4 = -1.157
so acceleration is -1.157m/(s^2)
I think it is b I am not sure though. Velocity is a vector. So, change in direction may also mean change in velocity. It doesn't necessarily need to change the magnitude.
Step-up transformers<span> are </span>used<span> at power stations to produce the very high voltages needed to </span>transmit electricity<span> through the National Grid power lines. These high voltages are too dangerous to use in the home, so </span>step<span>-down </span>transformers<span> are</span>used<span> locally to reduce the voltage to safe levels.</span>
