A model airplane is flying north at 12.5 m/s initially - and 25 seconds later is observed heading 30 degrees west of north at 25 m/s. What is the magnitude of the average acceleration during this time interval?
A. 0.37 
B. 0.50
C. 0.62
D. 0.87
C. 0.62
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If a star is located at 10 pc, which of the following statements is correct?
a. The star's apparent and absolute visual magnitudes are equal. b. The star's apparent and absolute visual magnitudes are 0. c. The star's apparent visual magnitude is –-1.1 whereas the absolute visual magnitude is –5 d. Two of the other choices are correct.
An object of zero radius is known as a __________________
Fill in the blank(s) with correct word
Astronomy is pseudoscience
a. True b. False Indicate whether the statement is true or false
The volume coefficient of thermal expansion for gasoline is 950 × 10-6 K-1. By how many cubic centimeters does the volume of 1.00 L of gasoline change when the temperature rises from 30°C to 50°C?
A) 6.0 cm3 B) 12 cm3 C) 19 cm3 D) 37 cm3