In U.S. customary units, air pressure is measured in pounds per square inch. In the metric system, it is measured in Pascals, and one Pascal is equal to
A. one newton per square centimeter.
B. one newton per square meter.
C. one metric ton per hectare.
D. one pound per square foot.
E. None of these choices are correct
Answer: B
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The ozone layer is
a. transparent to ultraviolet radiation. b. opaque to ultraviolet radiation. c. opaque to visible light. d. opaque to infrared radiation. e. responsible for producing most of the oxygen that animal life needs.
Two blocks of different mass are connected by a string. The system is accelerated across a smooth horizontal surface by a force supplied by a rubber band connected to the less massive block. The tension in the connecting string will be
A. the same as the force pulling the leading block. B. greater than the force pulling the leading block. C. less than the force pulling the leading block. D. zero.
In a mass spectrometer, a single-charged particle has a speed of 1.00 × 106 m/s and enters a uniform magnetic field of 0.200 T at a right angle to the field. The radius of the resulting circular orbit is 20.75 cm
What is the mass of the particle? (e = 1.60 × 10-19 C) A) 6.64 × 10-27 kg B) 3.20 × 10-27 kg C) 1.67 × 10-27 kg D) 9.11 × 10-31 kg
A metal wire of resistance R is cut into three equal pieces that are then placed together side by side to form a new cable with a length equal to one-third the original length. What is the resistance of this new cable?
1. 1/9 R 2. 1/3 R 3. R 4. 3R 5. 9R