A 250-kg motorcycle goes around an unbanked turn of radius 13.7 m at a steady 96.5 km/h. What is the magnitude of the sum of the forces exerted on the motorcycle?
A) 719 N
B) 2.95 × 103 N
C) 1.31 × 104 N
D) 4.31 × 104 N
C
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Resistance and Resistivity: A certain metal has a resistivity of 1.68 × 10-8 ? ? m. You have a long spool of wire made from this metal. If this wire has a diameter of 0.15 mm, how long should you cut a segment so its resistance will be 15 ??
A. 16 mm B. 16 cm C. 1.6 m D. 16 m
The graph shows 
versus t for an object moving along straight line. What is the average velocity from t = 0 to t = 11 s?
A. 25 
B. 36
C. 30
D. 21
Two identical silver spheres of mass m and radius r are placed a distance R (sphere 1) and 2R (sphere 2) from the Sun, respectively. The ratio of the gravitational force exerted by the Sun on sphere 1 to the pressure of solar radiation on sphere 1 is T1; the ratio for sphere 2 is T2 . The ratio of T2 to T1 is
a. 0.25. b. 0.50. c. 1.0. d. 2.0. e. 4.0.
A camera lens is initially set at f/16 for a shutter speed of 1/30 s. If the amount of lighting on the subject is unchanged, and the lens is set at f/5.6, what is the proper shutter speed at this setting?
a. 1/8 s c. 1/500 s b. 1/250 s d. 1/16 s