Suppose that in an experiment, different results are obtained from a subset than the results obtained from the whole. What term would best explain this?
a. probability
b. trend
c. variable
d. statistically significant
e. sampling error
e
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Two in phase coherent sources emitting harmonic waves of wavelength ? are separated by a distance d
What is the minimum non-zero value of d for which constructive interference occurs everywhere along the line that passes through the locations of the two sources? A) ?/4 B) ? C) 2? D) ?/2 E) 4?
Identify a true statement about planets
A) They are the size of the Sun. B) They shine by reflecting sunlight. C) There are nine planets in our Solar System. D) There generate energy by nuclear fusion reactions.
The results of statistical studies of the exoplanet systems discovered to date suggest that
A) planets are common B) small planets outnumber large plates by a significant margin C) Earth-size planets are very common D) all of these are true
An object moves 10 m east in 30 s and then returns to its starting point taking an additional 70 s. If west is chosen as the positive direction, what is the average speed of the object?
a. 0.20 m/s c. 0.50 m/s b. –0.20 m/s d. 0 m/s