Series/Parallel Circuits: When unequal resistors are connected in series across an ideal battery,
A. the same power is dissipated in each one.
B. the potential difference across each is the same.
C. the current flowing in each is the same.
D. the equivalent resistance of the circuit is less than that of the smallest resistor.
E. the equivalent resistance of the circuit is equal to the average of all the resistances.
Answer: C
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Why are fossils of early life on Earth more rare than fossils of plants and animals from the past few hundred million years?
A) Life was far less abundant prior to a few hundred million years ago. B) Early organisms lacked skeletons and other hard structures that are most likely to be fossilized. C) Fossils could not form before there was oxygen in the atmosphere. D) We find fossils in sedimentary layers, and no sediments were deposited until just a few hundred million years ago.
There are 640 acres in a square mile, and 5280 feet in one mile. What is the length in feet (to the nearest foot) of the side of a square having an area of one acre?
A) 660 feet B) 209 feet C) 165 feet D) 412 feet E) 435 feet
The requirement of liquid water is the most severe constraint on the development of life
Indicate whether the statement is true or false
Carnot Engine: A heat engine having the maximum possible efficiency has an efficiency of 25% when operating between two heat reservoirs. If the temperature of the cold reservoir is 300 K, what is the temperature of the hot reservoir?
A. 350 K B. 375 K C. 400 K D. 450 K E. 500 K