Human beings obtain energy from chemical reactions and carbon from other organisms. Given this, they can be classified metabollically as
A) photoheterotrophs
B) chemoheterotrophs
C) chemoautotrophs
D) photoautotrophs
B
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An image seen projected on a screen by a single lens
a. is always erect. b. is always inverted. c. is a real image. d. is a virtual image. e. none of the above
A fountain sends water to a height of 100 meters. What must be the pressurization (above atmospheric) of the water system? 1 atm= 1.01 × 105 N/m2.
A. 1.0 atm B. 4.2 atm C. 7.2 atm D. 9.7 atm E. 8.2 atm
River water flows around a circular 20-cm-diameter pier at 0.01 m/s. The flow is:
(A) Creeping flow (B) Flow with a wake (C) Stokes flow (D) Low-Reynolds-number flow
What do we mean by the spin of a subatomic particle?
A) It describes how fast the particle is rotating on its axis at a given time—if more torque is applied, the particle spins faster. B) It is one of the basic properties of any particle, and is a measure of the particle's angular momentum. C) It is a measure of the particle's electrical charge. D) The spin of a particle describes how the story of the particle is portrayed to journalists.