A particle leaves the origin with a velocity of 7.2 m/s in the positive y direction and moves in the xy plane with a constant acceleration of 
m/s2. At the instant the particle moves back across the x axis (y = 0), what is the value of its x coordinate?
A. 65 m
B. 91 m
C. 54 m
D. 78 m
E. 86 m
Answer: D
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If a 10°C piece of iron is heated until it has twice as much internal energy, its temperature will be
A) 20°C. B) 273°C. C) 293°C. D) 566°C. E) none of the above
Two red stars have surface temperatures of 3000 K, but Star A's luminosity is about 5% of the Sun's and Star B's luminosity is about 32,000 times the luminosity of the Sun. How much bigger is star B than star A?
A) They are the same size. B) Star B's radius is about 16 times larger than star A's radius. C) Star B's radius is about 800 times larger than star A's radius. D) Star B's radius is about 640,000 times larger than star A's radius. E) This cannot be determined from the information given.
A European sports car dealer claims that his car will accelerate at a constant rate from rest to 100 km/hr in 8.00 s. If so, what is the acceleration? (Hint: First convert speed to m/s.)
a. 3.47 m/s2 c. 11.4 m/s2 b. 4.63 m/s2 d. 18.5 m/s2
Complete the following nuclear decay equation:
Na + ________ ? Ne