The length of a certain wire is doubled and at the same time its radius is reduced by a factor of 2. What is the change in the resistance of this wire?
A) It is doubled.
B) It is quadrupled.
C) It increases by a factor of 6.
D) It increases by a factor of 8.
E) It is reduced by a factor of 2.
D
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What is the basic explanation for the origin of electromagnetic waves?
When a central dark fringe is observed in reflection in a circular interference pattern, waves reflected from the upper and lower surfaces of the medium must have a phase difference, in radians, of
a. 0. b. p/2. c. p. d. 3p/2. e. 2p.
In the figure, if F = 2.0 N and M = 1.0 kg, what is the tension in the connecting string? The pulley and all surfaces are frictionless
?
?
a.
2.6 N
b.
1.1 N
c.
2.1 N
d.
1.6 N
e.
3.7 N
____ is the brightest star in the constellation of Ursa Majoris
a. ? Ursa Majoris b. ? Ursa Majoris c. ? Ursa Majoris d. Wrong! Ursa Majoris is the name of the brightest star.