Amachinist turns the power on to a grinding wheel, which is at rest at time t = 0.00 s. the wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 25 rad/s. the wheel is run at that angular velocity for 37 s and then power is shut off. the wheel decelerates uniformly at 1.5 rad/s2 until the wheel stops. in this situation, the time interval of angular deceleration (slowing down) is closest to:
a) 17 s b) 15 s c) 19 s d) 21 s e) 23 s

Asample of a gaseous substance changes into a liquid

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage

Complete the statement about memory improvement. ( )involves organizing and breaking down information into easier groups to expand capacity. rehearsal is the verbal repetition of information. these techniques are especially important for the improvement of ( ) memory.