A track star in the broad jump goes into the jump at 12 m/s and launches himself at 20° above the horizontal. How long is he in the air before returning to Earth?
What will be an ideal response?
0.84 s
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At the instant a 2.0-kg particle has a velocity of 4.0 m/s in the positive x direction, a 3.0-kg particle has a velocity of 5.0 m/s in the positive y direction. What is the speed of the center of mass of the two-particle system?
A. 3.8 m/s B. 3.4 m/s C. 5.0 m/s D. 4.4 m/s E. 4.6 m/s
Two tuning forks sounding together result in a beat frequency of 3 Hz. If the frequency of one of the forks is 512 Hz, what is the frequency of the other?
a. 509 Hz or 515 Hz c. 518 Hz or 506 Hz b. 105 Hz d. 85 Hz
Both He3 and He4 are important in the proton-proton cycle. How are they different, and which comes first?
What will be an ideal response?
An intermediate _____________can have a wider region of possible compositions than does an intermediate compound.
Fill in the blank(s) with the appropriate word(s).