Figure P7.10 shows a graph of the motion of the blades of a blender that is starts empty and is initially turned off. Then the power is turned on at the highest speed setting, some ice cubes are added, and the blades slow down. The blades are 3.0 cm long.

a. When the blender is empty and running at high speed, how much time is required for a blade to turn by 90°?

b. How many revolutions does a blade complete between 15 and 20 seconds?

c. How fast is the tip of a blade moving when the blender is running empty?

Transcribed Image Text:

w (rad/s) 2500 2000 1500 1000 500 0 0 5 FIGURE P7.10 10 10 15 20 t(s)