A child runs and jumps tangentially onto an initially stationary playground merry-go-round. As a result, the merry-go-round begins to turn. Explain in terms of the child-merry-go-round system
What will be an ideal response?
The child has an initial angular momentum about the center of the merry-go-round. The total angular momentum of the system is conserved, so the merry-go-round must rotate when the child is on it.
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An organism with an Encephalization Quotient (EQ) of 1 is expected to be of
A) above-average intelligence B) average intelligence C) the lowest possible intelligence D) below-average intelligence
The fact that a particle cannot be precisely localized is the
a. photoelectric effect b. uncertainty principle c. principle of a hologram d. principle of a laser e. reason why photons are emitted
Exhibit 7-1
Three 5.0-kg masses are located at points in the xy plane as shown in the figure.
?
?
Use this exhibit to answer the following question(s).
Refer to Exhibit 7-1. What is the magnitude of the resultant force (caused by the other two masses) on the mass at x = 0.40 m, y = 0?
A. 2.2 × 10?8 N B. 1.9 × 10?8 N C. 1.4 × 10?8 N D. 1.6 × 10?8 N E. 2.5 × 10?8 N
The Coulomb constant, k, has a value of 
The permittivity of free space,
has the units
A. 
B. N·m/C.
C. 
D. 
E. that are not given.