Which of the following is not a greenhouse gas?
A) oxygen (O2)
B) carbon dioxide (CO2)
C) methane (CH4)
D) water vapor (H2O)
A) oxygen (O2)
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A ball is thrown straight up, reaches a maximum height, then falls to its initial height. As the ball is going up
A. both its velocity and its acceleration point downward. B. its velocity points downward and its acceleration points upward. C. its velocity points upward and its acceleration points downward. D. both its velocity and its acceleration point upward.
A 900-kg car traveling 30.0° south of east at 12.0 m/s collides with a 750-kg car traveling north at 17.0 m/s. The cars stick together. What is the speed of the wreckage just after the collision?
A) 7.21 m/s B) 12.2 m/s C) 20.4 m/s D) 25.0 m/s E) 17.3 m/s
Total Internal Reflection: The speed of light in a material is 0.41 c. What is the critical angle of a light ray at the interface between the material and a vacuum?
A. 24° B. 17° C. 19° D. 22°
The absolute magnitude of a celestial object is the apparent magnitude it would have if it were placed how far from the Earth?
a. 10 parsecs b. 3.26 light-years c. 1 astronomical unit d. None of the above