When a car is braked to a stop, its kinetic energy is transformed into
a. stopping energy
b. potential energy
c. heat energy
d. energy of motion
c
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The force on a dropped apple hitting the ground depends upon
A) the speed of the apple just before it hits. B) the time of contact with the ground. C) whether or not the apple bounces. D) all of the above
Cities have higher rates of lung disease than rural areas
What will be an ideal response?
Consider the image formed by a refracting telescope. Suppose an opaque screen is placed in front of the lower half of the objective lens. What effect will this have?
A) The top half of the image will be blacked out. B) The lower half of the image will be blacked out. C) The entire image will be blacked out, since the entire lens is needed to form an image. D) The image will appear as it would if the objective were not blocked, but it will be dimmer. E) There will be no noticeable difference in the appearance of the image with the objective partially blocked or not.
_______ has the most tightly bound nucleus
a. Uranium b. Iron c. Helium d. Hydrogen