What is the area of a circle of radius 1.119 m?
A) 3.934 m2
B) 3.93 m2
C) 3.9338 m2
D) 3.93378 m2
E) 3.937 m2
A
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A ________ is believed to occur when energy, stored in a twist in the solar magnetic field above a sunspot, is suddenly released
a. solar flare b. supergranule c. spicule d. coronal hole e. none of the others
When a projectile is launched, the velocity may be described as:
a. increasing in the vertical direction. b. decreasing in the horizontal direction. c. constant in the vertical direction. d. constant in the horizontal direction.
A merry-go-round of radius R = 2.0 m has a moment of inertia I = 250 kg×m2, and is rotating at 10 rpm. A child whose mass is 25 kg jumps onto the edge of the merry-go-round, heading directly toward the center at 6.0 m/s. The new angular speed (in rpm) of the merry-go-round is approximately
a. 10 b. 9.2 c. 8.5 d. 7.1 e. 6.4
A deuteron is accelerated from rest through a 10-kV potential difference and then moves perpendicularly to a uniform magnetic field with B = 1.6 T. What is the radius of the resulting circular path? (deuteron: m = 3.3 × 10^-27 kg, q = 1.6 × 10^-19 C)
a. 19 mm b. 13 mm c. 20 mm d. 10 mm e. 9.0 mm