When a suction cup sticks to a wall it is
A) pulled to the wall by the vacuum.
B) pushed to the wall by the atmosphere.
C) both of these
D) neither of these
Answer: B
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Which type of nebulaeare twisted and distorted clouds of gas and dust dense enough to obstruct the view of the more distant stars?
a. emission nebulae b. H I c. reflection nebulae d. dark nebulae e. spectral type B6
Discuss whether a car speedometer measures instantaneous speed or an average speed
What will be an ideal response?
Which of the following is not a piece of evidence supporting the idea that Europa may have a subsurface ocean?
A) Photos of Europa's surface show regions that appear to consist of jumbled icebergs frozen in place. B) Astronomers have detected small lakes of liquid water on Europa's surface. C) Europa has a magnetic field that appears to respond to Jupiter's magnetic field. D) Europa's surface shows very few impact craters.
An airplane flying overhead drops a care package directly over Mike at rest in his Corvette. Neglecting air resistance, the package will land
A) behind Mike. B) upon Mike and his Corvette. C) well ahead of Mike and his Corvette.