Scattered light in the atmosphere is often partially polarized. The best way to determine whether or not light from a particular direction in the sky shows polarization is to
a. diffract the light through a single slit.
b. squint while looking in that direction.
c. rotate a piece of polaroid film about an axis parallel to the ray while looking through it in that sky direction.
d. rotate a piece of polaroid film about an axis perpendicular to the ray while looking through it in that sky direction.
e. reflect the rays from that direction on a shiny metal surface.
C
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A 40.0-kg suitcase is being pulled along the ground by means of a strap which exerts a force of 10.0 N at an angle of 43.0° above the horizontal. What is the normal force exerted by the ground?
A) 17.1 N B) 15.7 N C) 385 N D) 272 N E) 398 N
Massive, more luminous stars have shorter lives than their smaller, dimmer counterparts
Indicate whether the statement is true or false
The net direction in which electrons flow through a circuit is:
A) the direction of the conventional current. B) opposite of the direction of the conventional current.
Increasing the speed of waves on a guitar string increases the _________ of the sound it produces
Fill in the blank(s) with correct word