A house brick of dimensions 21.0 cm x 10.0 cm x 7.00 cm. The brick is held under water with its largest surfaces horizontal. The density of water is 1000 kg/m3.

(a) Calculate the difference in pressure between the top and the bottom surfaces of the brick.

pressure difference =
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(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?