Collisions in Two Dimensions: A 1500-kg car traveling at 90 km/h toward the east suddenly collides with a 3000-kg car traveling at 60 km/h toward the south. The two cars stick together after the collision. What is the speed of the cars after collision?
A. 8.3 m/s
B. 14 m/s
C. 17 m/s
D. 22 m/s
Answer: B
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a. 5.21 b. 3.14 c. 10 d. 2.51
An infrared thermometer operates by way of
A) temperature differences. B) radiant energy invisible to humans. C) conduction, convection, and radiation. D) none of the above