Three spaceships A, B, and C are in motion, as shown in the figure. The commander on ship B observes ship C approaching with a relative velocity of 0.78c
The commander also observes ship A, advancing in the rear, with a relative velocity of 0.31c. What is the velocity of ship C, relative to an observer on ship A?
A) 0.88c
B) 0.38c
C) 1.4c
D) 0.62c
E) 1.1c
Answer: A
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A 
cm rectangular piece of copper is at a temperature of 10.0
The coefficient of linear expansion of copper is 
If the temperature of the copper rectangle increases its temperature by 2.00
then what is the change in the area of the rectangular piece of copper?
A. 
B. 
C. 
D. 
E. 
A 2 000-kg sailboat experiences an eastward force of 4 500 N by the ocean tide and a wind force against its sails with magnitude of 1 500 N directed toward the northwest (45° N of W). What is the direction of the resultant acceleration?
a. 27° N of W b. 58° N of W c. 27° N of E d. 17° N of W e. 17° N of E
Which of the following is not a fundamental quantity?
a. Weight b. Length c. Time d. Mass
Monochromatic light from a He-Ne laser (? = 632.8 nm) is incident on a diffraction grating containing 5000 lines/cm. Determine the angle of the first-order maximum
a. 18.4° b. 39.2° c. 14.6° d. 27.7° e. 13.9°