You experience weightlessness
A) in the absence of a supporting surface.
B) momentarily when you step off a chair.
C) in a freely falling elevator.
D) all of the above
Answer: D
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A car drives over a hilltop that has a radius of curvature 0.120 km at the top of the hill. At what speed would the car be traveling when it tires just barely lose contact with the road when the car is at the top of the hill?
A) 45.5 m/s B) 41.8 m/s C) 34.3 m/s D) 22.2 m/s E) 27.6 m/s
For condensation of a vapor using multiple horizontal cold tubes, suggest an arrangement of the tubes to maximize condensation.
What will be an ideal response?
The place the Sun stops its northward motion along the ecliptic is the
A) equator. B) prime meridian. C) summer solstice. D) vernal equinox.
Where do most dust grains form?
A) in supernovae B) in the winds of red giant stars C) in planetary nebulae D) in molecular clouds