When the reflection of an object is seen in a convex mirror the image will
a. always be real.
b. always be virtual.
c. may be either real or virtual.
d. will always be enlarged.
b
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A sound wave in brass has a displacement amplitude of 3.00 mm. The frequency of the sound wave 750 Hz and the velocity is 2,813 m/s. If the density of brass is 
then what is the pressure amplitude of the sound wave?
A. 
B. 
C. 
D. 
E. 
Graphical Analysis: The figure shows a graph of the position of a moving object as a function of time.(a) What is the average velocity of the object from t = 0 s to t = 4.0 s?(b) What is the average velocity of the object from t = 0 s to t = 6.0 s?
Fill in the blank(s) with the appropriate word(s).
If the average density of the universe is less than the critical density, the universe is open
Indicate whether the statement is true or false
A race car goes around a curve at 50 m/s. The radius of the curve is 400 m. What is the car's acceleration?