A cat strolls across your backyard. An hour later, a dog with its nose to the ground follows the trail of the cat. Explain what is going on from a molecular point of view
A) The dog is following the areas of increased density of the Earth.
B) The dog is smelling atoms from the cat.
C) The dog is smelling molecules from the cat.
D) The cat is leading the dog into a trap.
Answer: C
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The elastic modulus of a material, except for elastomers, is proportional to the _____________of the interatomic potential.
Fill in the blank(s) with the appropriate word(s).
A parallel-plate capacitor has plates of area 0.40 m2 and plate separation of 0.20 mm. The capacitor is connected to a 9.0 V battery
(a) What is the electric field between the plates? (b) What is the capacitance of the capacitor? (c) What is the charge on the capacitor?
Voyager 2 should reach the nearest stars (besides the Sun) in about 500 years
Indicate whether the statement is true or false
A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it approaches a stationary pedestrian. What frequency does the pedestrian hear? The speed of sound in air is 343 m/s
A) 200 Hz B) 375 Hz C) 400 Hz D) 425 Hz E) 450 Hz