An electric vehicle starts from rest and accelerates at a rate of 2.4 m/s2 in a straight line until it reaches a speed of 27 m/s. the vehicle then slows at a constant rate of 1.3 m/s2 until it stops. (a) how much time elapses from start to stop? (b) how far does the vehicle move from start to stop?

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

=force × distance a. work b. velocity c. pressure d. momentum

Ahair dryer is basically a duct in which a few layers of electric resistors are placed. a small fan pulls the air in and forces it through the resistors where it is heated. air enters a 1200 w hair dryer at 100 kpa and 22°c and leaves at 47°c. the cross-sectional area of the hair dryer at the exit is 60 cm2. neglecting the power consumed by the fan and the heat losses through the walls of the hair dryer, determine (a) the volume flow rate of air at the inlet and (b) the velocity of the air at the exit.