In a two-body collision, if the kinetic energy of the system is conserved, then which of the following best describes the momentum after the collision?
a. must be less
b. must also be conserved
c. may also be conserved
d. is doubled in value
b
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Transformers: An ideal step-down transformer is needed to reduce a primary voltage of 120 V to 6.0 V. What must be the ratio of the number of turns in the secondary to the number of turns in the primary?
Fill in the blank(s) with the appropriate word(s).
Since atoms are mostly empty space, why don't objects pass through one another?
A) The electrons on the atoms repel other electrons on other atoms when they get close. B) The nucleus of one atom repels the nucleus of another atom when it gets close. C) The nucleus of one atom attracts the nucleus of a neighboring atom to form a barrier. D) The electrons of one attract the nucleus of a neighboring atom to form a barrier.
A Doppler red shift indicates
a. a shift toward higher frequencies. b. a shift toward longer wavelengths. c. that a light source is approaching relative to the observer. d. none of these.
A chemical reaction is balanced by applying all except which of the following principles?
a. No atoms are gained, lost, or changed in identity. b. Only the numbers preceding formulas can be changed. c. The set of smallest whole numbers should be used. d. Subscripts in the formulas may be changed if necessary.