How many forces operated in the universe during the GUT era?
A) one, what we call the "super force"
B) two, gravity and the GUT force
C) two, gravity and the electroweak force
D) three, gravity, the strong force, and the electroweak force
E) all of the above forces
B
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A 3.0 cm tall statue is 48. cm in front of a biconvex lens (focal length 20. cm). (a) Is the image real or virtual? (b) How far is the image from the lens? (c) Is the image upright or inverted? (d) How high is the image?
What will be an ideal response?
A magnifying glass produces a virtual image
Indicate whether the statement is true or false
Diamond is made of carbon atoms attached rigidly to each other in three directions making diamond very strong. Graphite, as found in a pencil, is easily broken under pressure. Since graphite is also made of carbon atoms, why might it have such a different property?
a. The carbon atoms in graphite form strong bonds along two-dimensional sheets but attach weakly between sheets. b. The carbon atoms in graphite are a different form of carbon from that in diamond. c. The surfaces of diamonds are treated to make them strong. d. The carbon atoms in graphite are not arranged in a regular repeating pattern, so that it is not a crystal while diamond is. e. Each carbon atom in graphite is only weakly attached to each of its neighboring carbons.
Two identical blocks fall a distance H. One falls directly down; the other slides down a frictionless incline. Which has the larger speed at the bottom?