During what time of year is Orion most prominent in the sky over Pennsylvania?
A) Fall
B) Spring
C) Winter
D) Summer
E) It is visible year round.
Ans: C) Winter
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A motorist travels 160 km at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this trip?
A) 84 km/h B) 89 km/h C) 90 km/h D) 91 km/h
A highly reliable laser emits a steady beam of light at a fixed frequency f that hits a photodetector a light year away in what we can assume is empty space. The laser/detector setup is now placed as a system with a black hole directly behind the laser. What happens to the frequency of the light beam?
In a loop in a closed circuit, the sum of the currents entering a junction equals the sum of the currents leaving a junction because
a. the potential of the nearest battery is the potential at the junction. b. there are no transformations of energy from one type to another in a circuit loop. c. capacitors tend to maintain current through them at a constant value. d. current is used up after it leaves a junction. e. charge is neither created nor destroyed at a junction.
A _____ is a commonly accepted set of scientific ideas and assumptions
A) deferent B) paradigm C) theory D) hypothesis