A 1000-kg car approaches an intersection traveling north at 20.0 m/s. A 1200-kg car approaches the same intersection traveling east at 22.0 m/s
The two cars collide at the intersection and lock together. Ignoring any external forces that act on the cars during the collision, what is the velocity of the cars immediately after the collision?
A) 29.7 m/s in a direction 47.7° east of north
B) 21.1 m/s in a direction 47.7° west of south
C) 15.1 m/s in a direction 52.8° east of north
D) 21.1 m/s in a direction 52.8° east of north
E) 21.1 m/s in a direction 47.7° east of north
Answer: C
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Based on current scientific evidence, what is the likelihood that life on Earth formed spontaneously from increasingly complex chemical reactions?
A) very likely B) certain C) impossible D) very unlikely
A fossil is found in a layer of strata below one layer dated at 8 million years. From this we can deduce the age of the fossil to be
A) between 7 and 8 million years old B) we can tell nothing about the fossil's age from this data C) older than 8 million years D) younger than 7 million years
The primary source of the energy radiated by a star, such as the sun, is
A) fusion reactions in which helium is fused to form iron. B) fusion reactions in which hydrogen is fused to form helium. C) beta decay. D) fission reactions involving uranium. E) alpha decay.
How long ago did the Big Bang occur?
a. About 6,000 years ago. b. 15 thousand years ago. c. 15 million years ago. d. 15 billion years ago. e. 15 trillion years ago.