Which of these statements about double clutching and shifting is true? a. If you miss a gear while up-shifting, you must bring the vehicle to a stop.
b. Double clutching should only be used with a heavy load.
c. Double clutching should not be used when the road is slippery.
d. You can use the tachometer to tell you when to shift.

Apiping systems consists of 6 m of 6-std type k and 12 m of 4-std type k, both drawn copper tubing. the system conveys ethylene glycol at a rate of 0.013 m3/s. the pressure drop across the system is to be calculated. there are two 90° elbows in the 6-in pipe, a reduction from the 6-in pipe to the 4-in pipe and four 90° elbows in the 4-in pipe. all fittings are soldered (same as flanged) and regular. the inlet and outlet of the system are at the same height.