Can you please help me select the correct answers.

6. Water is flowing in a pipe. Which of the following statements must be true? (a) If the pipe increases in height without changing diameter, the pressure in the water will increase. (b) If the pipe diameter decreases, the speed of the water must increase. (c) If the pipe decreases in height, the speed of the water must increase. (d) If the pipe diameter increases and the pipe height decreases, the pressure in the water must increase. ( a ) (b ) 7. Which of the following situations depicts negative angular acceleration? (a) (c) (c) (d) Net torque on - (d) wheel is clockwise T = +4 Nm 1 =2/5 mr2 8. A mass is compressed between two ideal springs on a frictionless horizontal surface, as shown in the figure. When the mass is in equi- librium, both springs are at their relaxed length. Which of the follow- ing statements are true regarding this situation? (a) The mass experiences the largest net force when the potential energy in the springs is the greatest. (b) The mass accelerates most when its kinetic energy is the highest. (c) The maximum potential energy is greater than the maximum kinetic energy. (d) If the energy of the oscillation is increased, the frequency will decrease. (e) If the energy of the oscillation is increased, the frequency will also increase. (f) If the energy of the oscillation is increased, the frequency will remain constant