Which one of the following sets of characteristics describes the image formed by a plane mirror?
A) real and inverted
B) real and upright
C) virtual and upright
D) virtual and inverted
E) virtual and larger than the object
C
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44 g of petrified wood was found in a petrified forest. A sample showed a 14C activity of 100 decays/minute. How long has the tree been dead (in years)? (The half-life of carbon-14 is 5730 years and freshly cut wood contains 6.5 × 10^10 atoms of 14C per gram.)
a. 12 300 b. 15 600 c. 8 500 d. 4 700 e. 2 400
The Milky Way shows evidence that over its history it has merged with and "cannibalized" smaller galaxies.
Answer the following statement true (T) or false (F)
A blueberry pie will be a net absorber of energy when its temperature is
A) higher than its surroundings. B) lower than its surroundings. C) none of these
Equilibrium: A stepladder consists of two halves that are hinged at the top and connected by a tie rod which keeps the two halves from spreading apart. In this particular instance, the two halves are 2.5 m long, the tie rod is connected to the center of each half and is 70 cm long. An 800-N person stands 3/5 of the way up the stepladder, as shown in the figure. The ladder is light enough that we can neglect its weight, and it rests on an extremely smooth floor. What is the tension in the tie rod? (Note: To solve this problem, it is helpful to imagine cutting the ladder in half vertically and consider the forces and torques acting on each half of the ladder.)
width="398" /> A. 140 N B. 240 N C. 280 N D. 360 N E. 560 N