A nearsighted person has a far point that is 4.2 m from his eyes. What focal length lenses in diopters he must use in his contacts to allow him to focus on distant objects?
A) 0.48 diopters
B) -0.48 diopters
C) -0.36 diopters
D) -0.24 diopters
E) 0.24 diopters
D
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A 70-kg stunt artist rides in a rocket sled which slides along a flat inclined surface. At an instant when the sled's acceleration has a horizontal component of 6.0 m/s2 and a downward component of 2.8 m/s2, what is the magnitude of the force on the rider by the sled?
a. 0.83 kN b. 0.98 kN c. 0.65 kN d. 0.68 kN e. 0.72 kN
What is the "water hole"? Why is so promising to radio astronomers?
What will be an ideal response?
A 500-N tightrope walker stands at the center of the rope. If the rope can withstand a tension of 1 800 N without breaking, what is the minimum angle the rope can make with the horizontal?
a. 82° b. 8.0° c. 16° d. 0.40° e. 7.2°
Popeye, of mass 70 kg, has just downed a can of spinach. He accelerates quickly and stops Bluto, of mass 700 kg (Bluto is very dense), who is charging in at 5.0 m/s. What was Popeye's remarkable speed?
a. 10 m/s c. 50 m/s b. 31 m/s d. 100 m/s