One of the methods used to date supernova remnants (the remains of exploded stars) today is by using
A. the works of Ptolemy.
B. the records of ancient Chinese, Japanese, and Korean astronomers.
C. Kepler's laws.
D. the notebooks of Galileo.
Answer: B
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Components: If a vector 
has components Ax < 0, and Ay < 0, then the angle that this vector makes with the positive x-axis must be in the range
A. 0° to 90°. B. 90° to 180°. C. 180° to 270°. D. 270° to 360°. E. It cannot be determined without additional information.
Sound waves of a certain frequency in air having a wavelength of 1.9 m will have what wavelength in water? Take the speed of sound in air to be 340 m/s and in water to be 1490 m/s
a. 0.57 m c. 8.3 m b. 1.9 m d. 11 m
Light consisting of a mixture of red and blue light enters a 40°, 70°, 70° prism along a line parallel to the side opposite the 40° vertex. The index of refraction of the prism material for blue light is 1.530, and for red light it is 1.525
What is the angle between the two emerging beams of light? A) 0.5° B) 0.9° C) 0.1° D) 0.3° E) 0.7°
A 958-N rocket is coming in for a vertical landing. It starts with a downward speed of 25 m/s and must reduce its speed to 0 m/s in 8.0 s for the final landing
(a) During this landing maneuver, what must be the thrust due to the rocket's engines? (b) What must be the direction of the engine thrust force?