The first scientific attempt to map the Milky Way galaxy
a. showed that the Sun was located in the center of the system of planets making up our galaxy.
b. showed that our galaxy is a round ball on which we live.
c. showed that our galaxy has 9 stars.
d. used globular clusters to determine the location of the center of the Earth.
e. was completed by William and Caroline Herschel.
e
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A bicycle whose wheels have a radius of 66 cm is traveling at 2.0 m/s. If the wheels do not slip, what is the angular speed of the wheels?
What will be an ideal response?
A clerk can lift containers a vertical distance of 1 m, or roll them up a 2-m-long ramp to the same elevation. With the ramp, the applied force needed is
A) half as much. B) twice as much. C) the same.
A 0.28-kg stone you throw rises 34.3 m in the air. The impulse your hand receives from the stone while it throws the stone is
a. 2.7 N s, up. b. 2.7 N s, down. c. 7.3 N s, up. d. 7.3 N s, down. e. 9.6 N s, up.
The Balmer series in hydrogen
A) includes the Lyman series. B) includes both the Paschen series and the Lyman series. C) includes the Paschen series. D) has four lines in the ultraviolet. E) has four lines in the visible.