If the 2.00 cm diameter inlet tube narrows to 1.00 cm in
diameter, what is the pressure drop in the narrow section for the
2.16 m/s airflow in the 2.00 cm section? (Suppose the air density
is 1.25 kg/m3.)
a. 20.3 Pa
b. 11.7 Pa
c. 45.7 Pa
d. 43.7 Pa
Two rigid objects, a ring and solid disc, have the same mass,
radius and angular velocity. If the same braking torque is applied
to each one, which takes longer...