GSCI Quiz #4
How quickly would you have to move a 5cm diameter stick through olive oil to begin to see turbulence around the stick? (Olive oil has a density of 918 kg/m3 and a viscosity of 0.84 pa*s)
3.66 m/s
Wind is one of nature's way of transferring energy through?
Convection
Aerodynamic forces consist of...
Drag and lift.
Why does an ice cube feel cold?
Heat from your had enters the cube by conduction.
A curve ball is baseball curves because of...
Lift forces
You are a mechanic in a garage and are working on a carburetor that is made of metal, has a glass inspection window and plastic gears for the choke. If all three types of materiaL are at the same temperature and each type of material is in contact with the other two, then
No heat will flow between any parts
If a glob ball were smooth rather than dimpled, it would...
Not travel as far after being hit by a golf club
Why does fuzz on a tennis ball help it travel farther when hit?
The fuzz "trips the boundary layer, causing turbulence everywhere around the ball
Soil heats up much faster than water when the two are exposed to sunlight. Use that fact and your understanding of heat transfer to predict which way the wind will blow near the surface of the earth as the sun rises near the seashore.
The surface wind will blow from the water toward the land.
What aerodynamic forces act on a ball in laminar flow? And how fast would it be traveling
Viscous drag- no pressure drag and very slow 1cm/sec
Label a baseball in laminar flow. Where is the high/low pressure?
pic
Dimples on a golf ball hit without spin
reduce drag
