What is the purpose of having automobile air bags?
Answers may vary:
-Reduce the impact force in a collision
-Increase the contact time in stopping a person
-Increase the surface area of the impact force
-Increase survivability
-Decrease injuries
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A lens that is thicker at the center than the edges
a. is a converging lens. b. is a diverging lens. c. always forms a real image. d. always forms a virtual image. e. none of the above
Our Sun and its planets were formed about _____
A) 2.2 billion years ago B) 4.6 billion years ago C) 5.2 billion years ago D) 6.1 billion years ago
A 20-turn coil of area 0.32 m2 is placed in a uniform magnetic field of 0.055 T so that the perpendicular to the plane of the coil makes an angle of 30° with respect to the magnetic field. The flux through the coil is
A) 1.8 × 10-2 Tm2. B) 1.8 × 10-1 Tm2. C) 8.8 × 10-2 Tm2. D) 8.8 × 10-3 Tm2. E) 1.5 × 10-2 Tm2.
The lifetime of uranium 238 is 6.0 × 109 y, and that of uranium 235 is 1.0 × 109 y. The present abundance of uranium 238 is 140 times the abundance of uranium 235. What was the ratio of abundances 1 billion years ago?
A) 140:1 B) 6:1 C) 61:1 D) 161:1 E) 322:1