You slowly rub your wet finger around the thin rim of a wine glass while you hold its base firmly to a tabletop with your other hand. The resulting sounds illustrates
A) forced vibrations.
B) resonance.
C) both of these
D) none of the above
Answer: C
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The position of an object at equal time intervals is shown below:
Which graph below correctly represents position versus time for this object?
a.
Physics & Space Science
Relative Velocity: A plane flies directly from city A to city B, which are separated by 2300 mi. From A to B, the plane flies into a 65 mi/h headwind. On the return trip from B to A, the wind velocity is unchanged. The trip from B to A takes 65 min less than the trip from A to B. What is the airspeed (assumed constant) of the plane relative to the air (that is, the airspeed)?
A. 530 mi/h B. 400 mi/h C. 480 mi/h D. 610 mi/h
The cores of the Moon and Mercury are similar in that
A) both cores are more iron rich than the rest of the body and the core is solid throughout. B) both cores are large in proportion to the object with a solid inner core and fluid outer core. C) both cores are more iron rich than the rest of the body, with a solid inner core and fluid outer core. D) both cores are small in proportion to the object, with a fluid inner core and solid outer core.
When a switch is closed allowing current to flow in coil A, the current induced in a nearby coaxial but unconnected coil B will flow
A. will keep flowing long after the current in A is shut off. B. steadily until the current flow in A is shutoff. C. will not flow at all since the coils are not connected. D. only momentarily and then stop.