Water is pumped into a long pipe at the steady rate of 10 gallons per minute. It O emerges from the tap at the other end of that water is being pumped downhill. the pipe at the steady rate of only 6 gallons per minute. A possible reason for this decrease in flow O 2. is that water is being pumped uphill. 3. friction in the pipe. 4. a leak in the pipe. 0 5. that tap end of the pipe is wider than the pump end. 6. the viscosity of water. 07. that tap end of the pipe is narrower than the pump end