A hobby rocket reaches a height of and lands from the launch point with no air resistance. What was the angle of launch?
A) 69.0°
B) 67.4°
C) 22.6°
D) 44.8°
Answer: A
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A ball is thrown horizontally from the top of a building 0.10 km high. The ball strikes the ground at a point 65 m horizontally away from and below the point of release. What is the speed of the ball just before it strikes the ground?
a. 43 m/s b. 47 m/s c. 39 m/s d. 36 m/s e. 14 m/s
In order to produce precipitation, an air mass must rise because rising air
A) allows water droplets more time in the cloud where they can grow in size. B) produces downdrafts which increases the evaporation of droplets from the cloud. C) supports the downfall of raindrops. D) all of the above.
Study this H-R diagram. Which of the following stars has (or had) the longest hydrogen fusing lifetime? (The red arrows help you locate these stars on the diagram.)
A) Barnard's star B) Alpha Centauri B C) Betelgeuse D) the Sun
The focal length of the objective of a telescope is much longer than the focal length of the eyepiece
Indicate whether the statement is true or false