Toy locomotive on a circular track of radius 0.60 m At time t = 0, the locomotive is at point A. The locomotive travels at a constant speed round the track.
It takes 20 s to travel completely round the track.
(i) Calculate the speed of the locomotive

What are similarities and differences between refraction, reflection, diffraction and absorption?

What is a good example of instantaneous speed

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?