Suppose you use the Southern Cross to determine that the south celestial pole appears 40 degrees above your horizon. Then you must be located at ________
A) latitude 40 degrees north B) longitude 40 degrees
C) latitude 50 degrees south D) latitude 40 degrees south
D
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An ideal transformer has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary,
(a) what voltage is present in the secondary? (b) what current is present in the secondary?
The rigid body shown rotates about an axis through its center of mass and perpendicular to the paper. If M = 2.0 kg and L = 80 cm, what is the kinetic energy of this object when its angular speed about this axis is equal to 5.0 rad/s? Neglect the mass of the connecting rod and treat the masses as particles
a.
18 J
b.
15 J
c.
12 J
d.
23 J
e.
26 J
Muons at speed 0.9994c are sent round and round a circular storage ring of radius 1500 m. If a muon at rest decays into other particles after an average T = 2.2 × 10^-6 s, how many trips around the storage ring do we expect the 0.9994c muons to make before they decay?
a. 2 c. 0.2 b. 4 d. 6
When a damping force is applied to a simple harmonic oscillator which has angular frequency w0 in the absence of damping, the new angular frequency w is such that
a. w < w0. b. w = w0. c. w > w0. d. wT < w0T0. e. wT > w0T0.