Inez is putting up decorations for her sister’s quinceañera (fifteenth birthday party). She ties three light silk ribbons together to the top of a gateway and hangs a rubber balloon from each ribbon (Fig. P23.88). To include the effects of the gravitational and buoyant forces on it, each balloon can be modeled as a particle of mass 2.00 g, with its center 50.0 cm from the point of support. Inez rubs the whole surface of each balloon with her woolen scarf, making the balloons hang separately with gaps between them. Looking directly upward from below the balloons, Inez notices that the centers of the hanging balloons from a horizontal equilateral triangle with sides 30.0 cm long. What is the common charge each balloon carries? Figure P23.88
Inez is putting up decorations for her sister’s quinceañera (fifteenth birthday party). She ties three light silk ribbons together to the top of a gateway and hangs a rubber balloon from each ribbon (Fig. P23.88). To include the effects of the gravitational and buoyant forces on it, each balloon can be modeled as a particle of mass 2.00 g, with its center 50.0 cm from the point of support. Inez rubs the whole surface of each balloon with her woolen scarf, making the balloons hang separately with gaps between them. Looking directly upward from below the balloons, Inez notices that the centers of the hanging balloons from a horizontal equilateral triangle with sides 30.0 cm long. What is the common charge each balloon carries? Figure P23.88
Solution Summary: The author explains the common charge on each balloon, and the diagram for the equilateral triangle formed by balloons.
Inez is putting up decorations for her sister’s quinceañera (fifteenth birthday party). She ties three light silk ribbons together to the top of a gateway and hangs a rubber balloon from each ribbon (Fig. P23.88). To include the effects of the gravitational and buoyant forces on it, each balloon can be modeled as a particle of mass 2.00 g, with its center 50.0 cm from the point of support. Inez rubs the whole surface of each balloon with her woolen scarf, making the balloons hang separately with gaps between them. Looking directly upward from below the balloons, Inez notices that the centers of the hanging balloons from a horizontal equilateral triangle with sides 30.0 cm long. What is the common charge each balloon carries?
A Geiger counter is a device used to detect radiation, and consists of a thin metal wire (anode) at
the center of a metallic tube (cathode). As radiation enters the tube, electrons are knocked off
from the gas inside the tube or from the metallic wall, and accelerate towards the wire at the
center. Consider a Geiger counter with an evacuated tube (a vacuum existing between cathode
and anode), where the inner anode has a radius 4 mm and the outer cathode has a radius of 82
mm. The anode has a linear charge density of +18 nC/m, while the cathode has a charge per unit
length of -18 nC/m. Let the cathode potential be equal to zero (using it as voltage reference).
What is the potential at a distance of 142 mm from the center? Express your answer up to four
significant figures.
Anode
Cathode
A uranium ion and an iron ion are separated by a distance of ?=57.10 nm, as shown in the figure. The uranium atom is singly ionized; the iron atom is doubly ionized.
Calculate the distance ? from the uranium atom at which an electron will be in equilibrium. Ignore the gravitational attraction between the particles.
?=
What is the magnitude ?U of the force on the electron from the uranium ion?
A Geiger counter is a device used to detect radiation, and consists of a thin metal wire
(anode) at the center of a metallic tube (cathode). As radiation enters the tube, electrons
are knocked off from the gas inside the tube or from the metallic wall, and accelerate
towards the wire at the center. Consider a Geiger counter with an evacuated tube (a
vacuum existing between cathode and anode), where the inner anode has a radius 2 mm
and the outer cathode has a radius of 44 mm. The anode has a linear charge density of
+10 nC/m, while the cathode has a charge per unit length of -10 nC/m. Let the cathode
potential be equal to zero (using it as voltage reference).
What is the potential at a distance of 73 mm from the center? Express your answer up to four
significant figures. Note that this item is synced with the next item and that you can assume that the
length of the Geiger counter is much larger than the radius of the cathode.
Anode
Cathode
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