Why does a parachutist stop accelerating downward after opening the chute and then falling some distance?
a. Because of the influence of the parachute, there is no longer a pull on the parachutist due to gravity.
b. The parachutist's weight becomes zero as a result of the tug of the parachute.
c. Air resistance produces a pull on the parachutist that is equal and opposite to the pull of gravity.
d. The speed of freely falling objects is a constant.
e. All objects fall with the same acceleration.
c
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In a hydrogen atom, a given electron has n = 7. How many possible values can ? have?
A) 6 B) 7 C) 15 D) 98
Constellation names are from _____ translated into _______, the language of science in Europe to the 19th century
a. Greek; Latin b. Latin; Greek c. Latin; Arabic d. Greek; English e. Greek; Italian
The acceleration of the moon is
A) directed toward Earth B) directed along its forward direction of motion C) zero. D) directed outward away from earth E) None of the above.
In a single-slit diffraction experiment, the width of the central maximum is 6.0 mm. The width of the slit is then doubled as is the distance to the screen. What is the resulting width of the central maximum?
a. 12 mm b. 6.0 mm c. 24 mm d. 3.0 mm