Some household appliances have plugs with two prongs while others have three prongs. The additional prong is
A. for direct current.
B. for 120-Hz voltage.
C. to connect to ground.
D. for additional mechanical strength.
E. for 240-Hz voltage.
C. to connect to ground.
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Based on the definition of apparent brightness, which units are appropriate for its measurement?
A) watts B) joules C) watts per square meter D) Newtons
What happens to Pluto's atmospheric gases over time?
A) Pluto traps gases from other Kuiper Belt Objects, causing its atmosphere to become much, much thicker. B) Pluto does not have an atmosphere. C) Pluto's atmosphere vaporizes over time, due to low gravity in the exosphere. D) Pluto's atmosphere is collapsing gases that freeze and fall to the surface.
A negative potential energy may be made positive by changing the ______________ point
Fill in the blank(s) with correct word
An object is thrown upwards with a speed of 14 m/s. How long does it take to reach a height of 5.0 m above the projection point while descending?
A) 0.42 s B) 1.2 s C) 2.4 s D) 3.1 s E) 4.2 s