What is the average kinetic energy of an ideal gas molecule at 569°C? (The Boltzmann constant is 1.38 × 10-23 J/K.)
A) 1.74 × 10-20 J
B) 5.81 × 10-21 J
C) 1.18 × 10-17 J
D) 3.93 × 10-19 J
A
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A 60-W light bulb connected to a 120-V source draws a current of
A) 0.25 A. B) 0.5 A. C) 2.0 A. D) 4.0 A. E) more than 4 A.
Which of the following statements is a true statement?
A) A vector can have positive or negative magnitudes. B) A vector's magnitude cannot be more than the magnitude of one of its components. C) A vector's magnitude cannot be less than the sum of the magnitude of its components. D) If the x-component of a vector is smaller than its y-component then that vector is in the opposite direction to its y-component. E) The magnitude of a vector cannot be zero unless all of its components are zero.
Is aging primarily an example of a physical or chemical change?
A) Aging is an example of a physical change since it involves our physical bodies getting older each day. B) Aging is an example of a chemical change involving the chemical reformation of our biomolecules. C) Aging cannot be classified as either a physical or chemical change. D) None of the above is true.
In the Bohr model of the atom, a photon may be _________ when an electron jumps from a large, high energy orbit to a smaller, low energy orbit
Fill in the blank(s) with correct word