Three kids pull on a toy. Kim pulls with a force of 30 N north, Jim pulls with a force of 30 N south, and Tim pulls with a force of 15 N east. The acceleration of the toy is
A) 10 m/s2.
B) 15 m/s2.
C) 33 m/s2
D) need more information
Answer: D
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Comets are largely made out of
A) rock and ice. B) hydrogen gas. C) rock. D) hydrogen compounds. E) metal.
If we compress the entire history of the universe into one year, modern humans evolved
A) at 9 PM on New Year's Eve B) at midnight on New Year's Eve C) a couple of minutes before midnight on New Year's Eve D) a few seconds before midnight on New Year's Eve
To be dimensionally consistent, distance [L], velocity [L/T], and acceleration
must be related as follows.
A. 
B. distance = velocity/acceleration
C. 
D. 
What is the difference in frequency for spectral lines emitted by hydrogen for transitions from the n = 16 level to the n = 2 level and transitions from the n = 15 level to the n = 2 level? (RH = 1.097 × 10^7 m-1.)
a. 5.65 × 10^-13 Hz b. 31 Hz c. 1.77 × 10^12 Hz d. 2.55 × 10^16 Hz e. 1.02 × 10^17 Hz