2016 Pearson Education, Inc. Q3.11
The velocity and acceleration of an object at a certain instant are
v = (2.0 m/s>)i +(3.0 m/s) į
a =
= (0.5 m/s”) i – (0.2 m/s?) ·
At this instant, the object is
A. speeding up and following a curved path.
B. speeding up and moving in a straight line.
C. slowing down and following a curved path.
D. slowing down and moving in a straight line.
E. none of these.
© 2016 Pearson Education, Inc.

An ideal otto cycle has a compression ratio of 8. at the beginning of the compression process, air is at 95 kpa and 27°c, and 750 kj/kg of heat is transferred to air during the constant-volume heat-addition process. assuming constant specific heats at room temperature, determine (a) the pressure and temperature at the end of the heat-addition process, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle. (4390 kpa, 1730 k; 423 kj/kg; 56.4%; 534 kpa)