Ocean waves with a wavelength of 120 m are coming in at a rate of 8 per minute. What is their speed?
a. 8.0 m/s
b. 16 m/s
c. 24 m/s
d. 30 m/s
e. 4.0 m/s
B
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A certain fuse "blows" if the current in it exceeds 1.0 A, at which instant the fuse melts with a current density of 620 A/cm2. What is the diameter of the wire in the fuse?
A) 0.45 mm B) 0.63 mm C) 0.68 mm D) 0.91 mm
Addition by 1. Components: Four vectors, 
, 
, 
, and 
, are shown in the figure. The sum of these four vectors is a vector having magnitude and direction 
A. 4.0 cm, along +x-axis. B. 4.0 cm, along -x-axis. C. 4.0 cm, along +y-axis. D. 4.0 cm, along -y-axis. E. 4.0 cm, 45° above +x-axis.
What particle is emitted when 20Na decays to 20Ne? (atomic numbers of Na and Ne are, respectively, 11 and 10)
a. alpha b. beta (electron) c. beta (positron) d. gamma quantum
A potter's wheel decelerates from 50 rev/min to 30 rev/min in 5.0 s, with a constant deceleration. What is the magnitude of the deceleration?
A) 4.0 rad/s2 B) 0.42 rad/s2 C) 25 rad/s2 D) 38 rad/s2 E) 20 rad/s2