Question

Any object moving in a fluid experiences a drag or viscous force opposing its motion. Assume the object is spherical and the flow around it is laminar.
For an object of radius 0.25m moving in honey at 70F (viscosity 20 Pa.s), what is the drag force at a speed of 0.1 m/s?

If the object is moving horizontally and at the same constant speed of 0.1 m/s, a force must be exerted on it to maintain that motion. That means someone is doing work! Calculate the work required to maintain the motion for 16 seconds.

This is all the information given. Options for part A are

12 N

1.4 N

41.7 N

4.71 N

9.42 N

for B

15.07 J0.53 J7.53 J2.65 J175.2 J

Answer 1