According to the law of reflection, a light ray striking a mirror at an angle of incidence of 30 degrees will leaves the mirror at an angle of
a. 60 degrees
b. 30 degrees
c. less than 30 degrees
d. none of the above
D
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Both RR Lyrae and Cepheid variables are giants that ________ in size over time
Fill in the blank(s) with correct word
Under which of the following conditions is Ampere's law most easily applied?
a) the currents are all in the same direction b) the magnetic fields are spherically symmetrical c) no currents are present within the system d) the magnetic fields are cylindrically symmetric e) no charged particles are present in the system
For small angle approximations
a. the angle must be 10° or less b. the angle must be 10 radians or less c. the angle must be 1° or less d. the angle must be 1 radian or less e. the angle must be 45° or less
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