Distinguish between the concepts of velocity and acceleration, using a bowling ball's behavior as an example for each
What will be an ideal response?
Answer: Velocity is a measure of how fast something moves, while acceleration is a measure of "how fast how-fast changes." A bowling ball rolling along a horizontal surface is an example of an object with constant velocity. It rolls without change. But if it rolls off the end of the supporting surface and falls, both its speed and direction change. It is then in a state of acceleration. Whenever an object changes its state of motion we say it accelerates.
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A stone thrown horizontally from a cliff with an initial speed of 10 m/s hits the bottom of the cliff in 4.3 s. What is the height of the cliff?
A. 22 m B. 43 m C. 69 m D. 91 m
Which of the following does not lend support to the idea that Pluto is a Kuiper-belt object?
A) Pluto has a cometlike composition and density. B) Pluto is regarded by many to be a planet. C) Some asteroids have their own moons. D) Pluto has a more eccentric orbit than other planets. E) Some known Kuiper-belt objects are hundreds of kilometers across.
A refracting telescope has an eyepiece of focal length -80 mm and an objective of focal length 36 cm. What is the magnification of this instrument?
What will be an ideal response?
Complete the equation: CH3CH = CH2+ H2? ____________________
Fill in the blank(s) with correct word