A 0.14-km wide river flows with a uniform speed of 4.0 m/s toward the east. It takes 20 s for a boat to cross the river to a point directly north of its departure point on the south bank. What is the speed of the boat relative to the water?
a. 5.7 m/s
b. 8.5 m/s
c. 8.1 m/s
d. 7.0 m/s
e. 6.4 m/s
c
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Fill in the blank(s) with correct word
Objects used to map spiral arms are called spiral _______________
Fill in the blank(s) with correct word
The motion of a particle connected to a spring is described by x = 10 sin (?t). At what time (in s) is the potential energy equal to the kinetic energy?
A. 0 B. 0.25 C. 0.50 D. 0.79 E. 1.0
Starting from very far away, an object is moved closer and closer to a convex lens, eventually reaching the lens. What happens to its image formed by that lens? (There could be more than one correct choice.)
A) The image gets closer and closer to the lens. B) The image gets farther and farther from the lens. C) The image eventually changes from virtual to real. D) The image eventually changes from real to virtual. E) The image keeps getting larger and larger.