A water line enters a house 2.0 m below ground. A smaller diameter pipe carries water to a faucet 5.0 m above ground, on the second floor. Water flows at 2.0 m/s in the main line and at 7.0 m/s on the second floor. Take the density of water to be 1.0 × 103 kg/m3 . The difference in pressure between the main line and the second floor is:
A. 7.15 × 104 Pa with the main line at the higher pressure
B. 2.65 × 104 Pa with the main line at the higher pressure
C. 7.15 × 104 Pa with the main line at the lower pressure
D. 2.65 × 104 Pa with the main line at the lower pressure
E. 9.4 × 104 Pa with the main line at the higher pressure
