Sir Galahad is attacking the castle of Dunkirk. His engineers design a battering ram to break down the front door of this formidable fortress. If the ram’s mass is 1000kg and the maximum velocity it can attain is 5 m/s, what is the maximum kinetic energy that the ram can apply to the door?

(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?