The nearest star is 1 ly from the solar system
Indicate whether the statement is true or false
F
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A batter hits a home run in which the ball travels 110 m horizontally with no appreciable air resistance. If the ball left the bat at 50° above the horizontal just above ground level, how fast was it hit?
What will be an ideal response?
If a substance is radioactive it is definitely a. dangerous. b. emitting alpha particles. c. glowing. d. useful. e. all of the above. f. none of the above
Indicate whether the statement is true or false
A plane convex lens is made of glass (n = 1.5) with one flat surface and the other having a radius of 20 cm. What is the focal length (in cm) of the lens?
A. 20 B. 30 C. 40 D. 10 E. 50
Freely falling bodies experience
a. motion with constant velocity b. motion with zero acceleration c. motion with constant acceleration d. motion at a constant speed e. none of the above