Assume that the following code is executed on a five stage pipeline data path: add $5, $2, $1
lw $3, 4($5)
lw $2, 0($2)
or $3, $5, $3
sw $3, 0($5)
and $7, $7, $2

Required:
a. If there is no forwarding and hazard detection unit, insert NOPs in the code to ensure correct operation. How many clock cycles are needed to finish this set of instructions?
b. Repeat part (a) with this assumption that you can change or rearrange the instructions, and the only register that you can use in addition to the above registers is $6. How many clock cycles will you need in this case? What is the speed up compared to part (a).

If a particle moves along a path such that r : (3 sin t) m and ? : 2t rad, where t is in seconds. what is the particle's acceleration in m/s in 4 seconds? a)- 16.43 b)- 16.29 c)- 15.21 d)- 13.79

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.