An object is 50 cm in front of a plane mirror. Its image will be located
a. 50 cm in front of the mirror.
b. at the mirror's surface.
c. 50 cm behind the mirror.
d. 25 cm in front of the mirror.
e. 25 cm behind the mirror.
c
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The figure shows a block on an inclined plane
What is the expression for the normal force acting on the block?
a.
?Mg
b.
?Mgcos?
c.
?Mgsin?
d.
?Mgtan?
Acceleration: A water rocket can reach a speed of 75 m/s in 0.050 seconds from launch. What is its average acceleration?
Fill in the blank(s) with the appropriate word(s).
Two charges that are separated by one meter exert 1-N forces on each other. If the magnitude of each charge is doubled, the force on each charge is
A) 1 N. B) 2 N. C) 4 N. D) 8 N. E) none of the above
Water flowing through a pipe suddenly comes to a section of pipe where the pipe diameter decreases to 86% of its previous value. If the speed of the water in the larger section of the pipe was 36 m/s, what is its speed in this smaller section?
A) 49 m/s B) 42 m/s C) 31 m/s D) 27 m/s