A 900-kg car traveling east at 15.0 m/s collides with a 750-kg car traveling north at 20.0 m/s. The cars stick together. What is the speed of the wreckage just after the collision?
A) 6.10 m/s
B) 12.2 m/s
C) 25.0 m/s
D) 35.0 m/s
E) 17.3 m/s
B
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When is a comet's orbital speed at its maximum?
A) when it is closest to the Sun B) when it is farthest from the Sun C) Its orbital speed does not change.
One main type of feldspar that contains potassium is
a. quartz. b. orthoclase. c. plagioclase. d. pyrite.
Water pressurized to 3.5 × 10^5 Pa is flowing at 5.0 m/s in a horizontal pipe which contracts to 1/3 its former area. What are the pressure and velocity of the water after the contraction?
a. 2.5 × 10^5 Pa, 15 m/s b. 3.0 × 10^5 Pa, 10 m/s c. 3.0 × 10^5 Pa, 15 m/s d. 4.5 × 10^5 Pa, 1.5 m/s e. 5.5 × 10^5 Pa, 1.5 m/s
Exclusion Principle: Neon has 10 electrons. What is the value of Z of the next higher element that has chemical properties very similar to those of neon?
A. 11 B. 17 C. 18 D. 19 E. 36