GSCI Quiz #4

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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


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