A pilot drops a package from a plane flying horizontally at a constant speed. Neglecting effects of air, when the package hits the ground the horizontal location of the plane will
A) be behind the package.
B) be directly over the package.
C) be in front of the package.
D) depend on the speed of the plane when the package was released.
B
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The clouds of Mars consist mainly of frozen carbon dioxide and frozen water.
Answer the following statement true (T) or false (F)
A galaxy with a blueshift is moving ________ Earth
Fill in the blank(s) with correct word
A certain heat engine extracts 1.30 kJ of heat from a hot temperature reservoir and discharges 0.70 kJ of heat to a cold temperature reservoir. What is the efficiency of this engine?
A) 54% B) 86% C) 46% D) 13% E) 27%
A ringing alarm clock is placed in a bell jar, which is then sealed, and the air is pumped out of it. Which effect will most likely occur?
1.The sound of the ringing alarm clock will get louder as the air is pumped out. 2.The sound of the ringing alarm clock will get softer as the air is pumped out. 3.No noticeable change will occur as the air is pumped out. 4.The sound will diminish completely immediately after the air has begun to be pumped out.