Alec and Michelle release their snowballs from the same height, at the same time and with the same speed. Alec's is thrown upward while Michelle’s is thrown downward. Which one hits the ground with the greatest speed (ignore air resistance)?
A. the one thrown upward
B. the one thrown downward
C. they hit with the same speed
D. it depends on the initial height
C. they hit with the same speed
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A sketch of the Earth with its north and south poles and equator is shown. The zenith is located in the sky over your head if you are at
?
a.
Earth's equator.
b.
Earth's north pole.
c.
Earth's south pole.
d.
any of these.
A 6.0-?F air-filled capacitor is connected across a 100-V voltage source. After the source fully charges the capacitor, the capacitor is immersed in transformer oil (of dielectric constant 4.5)
How much ADDITIONAL charge flows from the voltage source, which remained connected during the process? A) 1.2 mC B) 1.5 mC C) 1.7 mC D) 2.1 mC E) 2.5 mC
If you run a complete loop around an outdoor track (400 m) in 100 s, your average speed is
A) 40000. m/s. B) 4.0 m/s. C) 4.0 km/h. D) 4.0 mph. E) 0.40 m/s.
The boundary between two air masses is called a
a. squall line. b. blizzard. c. tornado. d. front.