Suppose you are 80 cm from a plane mirror. what area of the mirror is used to reflect the rays entering one eye from a point on the tip of your nose if your pupil diameter is 6.7 mm ?

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

(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?

Can you match these to the correct definition