What causes erosion?

a. wind
b. water
c. glacier ice
d. all of the other choices.


d

Physics & Space Science

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The addition of aluminum fins has been suggested to increase the rate of heat dissipation from one side of an electronic device 1-m-wide and 1-m-tall. The fins are to be rectangular in cross section, 2.5-cm-long and 0.25-cm-thick. There are to be 100 fins per meter. The convective heat transfer coefficient, both for the wall and the fins, is estimated at 35 W/(m2 K). With this information, determine the per cent increase in the rate of heat transfer of the finned wall compared to the bare wall.

GIVEN
Aluminum fins with a rectangular cross section
Dimensions: 2.5-cm-long and 0.25-mm-thick
Number of fins per meter = 100

FIND
The per cent increase in the rate of heat transfer of the finned wall compared to the bare wall
ASSUMPTIONS
Steady state heat transfer
SKETCH

Physics & Space Science

The uncertainty principle was derived by whom?

a. Schrödinger b. Heisenberg c. de Broglie d. Compton

Physics & Space Science

Quarks can only have a charge of +(2/3)e or -(1/3)e, while antiquarks can only have charges of -(2/3)e or +(1/3)e

Indicate whether the statement is true or false

Physics & Space Science

When a hunter fires a rifle, the hunter feels a force against her shoulder. Explain why

What will be an ideal response?

Physics & Space Science