While looking into a mirror, you notice that the image of a tree is projected onto the back of a chair (the positions of the tree and image are shown here). You must be looking into
A. a convex mirror.
B. a concave mirror.
C. a plane mirror.
D. a negative mirror.
Answer: B
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Which star is the furthest away if all have the same apparent brightness?
a) type G main sequence star b) type F main sequence star c) type M main sequence star d) type A main sequence star e) white dwarf
The compound methyl salicylate is commonly called ______________
Fill in the blank(s) with correct word
The best shape for an automobile to have is one that is streamlined both in the front and in the back. The reason for this is
A. to ensure the air flow remains laminar all the way around the vehicle. B. to use the viscosity of the air to help propel the automobile forward. C. to improve fuel efficiency when driving in reverse. D. to avoid uneven air flows that might push the vehicle sideways.
If an object has an angular acceleration larger than zero, its angular ________ must be changing with time.
What will be an ideal response?