If you stand with your back towards a wall and your heels touching the wall, you cannot lean over to touch your toes. Why?
What will be an ideal response?
As you bend over your center of gravity moves forward and eventually is beyond the area of the floor in touch with your feet. This does not happen when you do it away from the wall because part of your body moves back and the center of mass remains over your feet.
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Astronomers observe huge bubbles of hot gas, some over a thousand light years across, in the Milky Way. What is their cause?
What will be an ideal response?
Velma's rocket ship is moving away from Mort at a speed of 0.75c. Mort fires a laser beam toward her spaceship, observing the tip of the laser beam to move away from him at speed c
According to the predictions of Galileo's relativity, Velma should observe this laser beam to pass her at a speed of A) 0.25c. B) 1.25c. C) 0.75c. D) 1.75c. E) None of the above.
The vertical columns of elements in the periodic table are called
a. periods. b. groups. c. families. d. series.
The area under the force-displacement curve represents:
a. area. b. work. c. force. d. coefficient of static friction.