When an oxygen-19 nucleus undergoes beta decay, the nucleus formed is that of
a. nitrogen-18.
b. oxygen-18.
c. fluorine-19.
d. carbon-14.
c
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You blow into an open pipe and produce a tone. What happens to the frequency of the tone if you place your hand over one end of the pipe and blow into it again?
A. depends on how hard you're blowing B. you hear the same frequency C. you hear a higher frequency D. you hear a lower frequency
A baseball is thrown vertically upward and feels no air resistance. As it is rising
A) both its momentum and its mechanical energy are conserved. B) its momentum is not conserved, but its mechanical energy is conserved. C) both its momentum and its kinetic energy are conserved. D) its kinetic energy is conserved, but its momentum is not conserved. E) its gravitational potential energy is not conserved, buts its momentum is conserved.
Exhibit 11-1
Two birds of prey hurtling after the same mouse collide in mid-air and grab each other with their talons. Each 250-g bird is flying at 30 m/s at a 60° angle to the ground.
?
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Use this exhibit to answer the following question(s).
Refer to . What is the horizontal component of their momentum, in 
High temperatures are required to get H nuclei to fuse because they ________ one another because of their ________ electric charges
a. attract; negative b. attract; positive c. repel; negative d. repel; positive