A rocket is launched from the origin with an acceleration of 20.0 
at an angle of 30.0 degrees above the horizontal. The launch acceleration lasts for 2.00 seconds at which time the fuel is exhausted. The rocket then falls with an acceleration of 9.80 
downward. What is the time it takes to reach maximum height?
A. 3.22 s
B. 3.87 s
C. 6.08 s
D. 4.75 s
E. 5.12 s
C. 6.08 s
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Parallel rays of light that hit a concave mirror will come together:
a. at the focal point. b. at a point half way to the focal point. c. at infinity. d. at the center of curvature.
You want to have an electron in an energy level where its speed is no more than 66 m/s. What is the length of the smallest box (an infinite well) in which you can do this? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg)
A) 5.5 µm B) 11 µm C) 2.8 µm D) 1.4 µm
If one of the intrinsically brightest stars in our sky were 10pc away from Earth, it would appear:
A) more than 10 times as bright as Earth at its brightest. B) more than 25 times as bright as Venus at its brightest. C) more than 10 times as bright as Venus at its brightest. D) more than 25 times as bright as Earth at its brightest.
Which of the following statements is not an observed pattern of motion in our solar system?
A) Most planets orbit at the same speed. B) All planets orbit the Sun in the same direction. C) Most planetary orbits lie nearly in the same plane. D) Most planets rotate in the same direction in which they orbit. E) Almost all moons orbit their planet in the same direction as the planet's rotation.