The size of the electric current in a electrical conductor is a function of which of the following?

a. conductor cross sectional area
c. density of charge carriers
b. velocity of charge carriers
d. All of these choices are valid.


D

Physics & Space Science

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Syrup having density of 1000 kg/m^3 and viscosity of 1250 cP flows through a deep trough at 10 m/s. Determine the Reynolds number at a distance 2 m downstream from the entrance. Is the flow in the boundary layer laminar or turbulent?

What will be an ideal response?

Physics & Space Science

Draw a schematic (not to scale) of the Milky Way Galaxy face on so that you see the spiral arms. Label the spiral arms. Now draw a schematic (not to scale) of the Milky Way Galaxy edge-on, and locate and label the disk

What will be an ideal response?

Physics & Space Science

Red giant stars are I. more luminous than the Sun. II. larger in diameter than the Sun. III. cooler than B stars. IV. located above the main-sequence stars in the H-R diagram

a. I & II b. II & IV c. I, II, & IV d. II, III, & IV e. I, II, III, & IV

Physics & Space Science

If originally there were X atoms of radioactive isotope present and now there are only X/4 atoms, how many half-lives have elapsed?

A) 1 B) 4 C) 2 D) 3

Physics & Space Science