The resultant of a pair of equal-size vectors at right angles to each other is
A. ?2 the length of either vector.
B. twice the length of either vector.
C. equal to that of either vector.
D. none of the above
Answer: A
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The Challenger expedition (1872-1876 ) was a unique and historic voyage. Why?
A) ?It is the longest continuous scientific oceanographic expedition on record. B) ?Its scientists developed the first reliable navigational charts to indicate current and wind patterns. C) ?It was the first expedition to use an echo sounder to study the seafloor. D) ?It proved the hypothesis that life could not exist in the deep sea.
Which of the following best matches the description?An unwanted plant.
A. micronutrient B. pheromone C. chlorinated hydrocarbon D. persistent pesticide E. rodenticide F. macronutrient G. biocide H. auxin I. herbicide J. micronutrients K. weed L. organophosphate M. macronutrients N. soft pesticide O. biomagnification P. fungicide Q. hard pesticide
Which of the following is the range of wavelengths corresponding to the maximum amount of radiation emitted by the Earth?
A. 0.5 micrometre 10 micrometers B. 1 micrometre 1 micrometer C. 10 micrometres 30 micrometers D. 30 micrometres 0.5 micrometers
What is the maximum specific humidity of a parcel of air at 0°C ?
The table on the right hand side of Figure 12.1 lists maximum specific humidity values for various temperatures. You can also use the table to find dew-point temperatures, if you know how many grams of water vapor per kilogram of air are present. What will be an ideal response?