Question

Two spheres at identical temperatures (300 K) are blackbody
radiators. One is the mass and the size

of the Earth, the other has the scale and mass of a student.
What are the bolometric mass-to-light ratios, in

solar units, for the two spheres?

Answer #1

Two metal spheres of identical mass m = 3.00 g are suspended by
light strings 0.500 m in length. The left-hand sphere carries a
charge of 0.865 µC, and the right-hand sphere carries a charge of
1.41 µC. What is the equilibrium separation between the centers of
the two spheres?

Two metal spheres of identical mass m = 4.40 g are suspended by
light strings 0.500 m in length. The left-hand sphere carries a
charge of 0.745 µC, and the right-hand sphere carries a charge of
1.47 µC. What is the equilibrium separation between the centers of
the two spheres?

Two identical conducting small spheres are placed with their
centers 0.250 m apart. One is given a charge of 12.0 nC, and the
other is given a charge of -16.0 nC.
(a) Find the electric force exerted on one sphere by the
other.
Magnitude
NDirection
(b) The spheres are connected by a conducting wire. Find the
electric force between the two after equilibrium has
occurred.
Magnitude
NDirection

Two identical tiny spheres of mass m =2g and charge q hang from
a non-conducting strings, each of length L = 10cm. At equilibrium,
each string makes and angle θ =50 with the vertical. Find the size
of the charge on each spere.

Two small identical conducting spheres are placed with their
centers 0.65 m apart. One is given a charge of 12 ? 10?9
C, the other a charge of ?17 ? 10?9 C.
(a) Find the electrostatic force exerted on one sphere by the
other.
magnitude
N
direction
---Select--- attractive repulsive
(b) The spheres are connected by a conducting wire. Find the
electrostatic force between the two after equilibrium is reached,
where both spheres have the same charge.
magnitude
N
direction...

Two identical conducting spheres, fixed in place, attract each
other with an electrostatic force of 0.107 N when their
center-to-center separation is 46.6 cm. The spheres are then
connected by a thin conducting wire. When the wire is removed, the
spheres repel each other with an electrostatic force of 0.0321 N.
Of the initial charges on the spheres, with a positive net charge,
what was (a) the negative charge on one of them
and (b) the positive charge on the...

Two identical conducting spheres, fixed in place, attract each
other with an electrostatic force of 0.155 N when their
center-to-center separation is 45.4 cm. The spheres are then
connected by a thin conducting wire. When the wire is removed, the
spheres repel each other with an electrostatic force of 0.0386 N.
Of the initial charges on the spheres, with a positive net charge,
what was (a) the negative charge on one of them
and (b) the positive charge on the...

Two identical conducting spheres, fixed in place, attract each
other with an electrostatic force of 0.149 N when their
center-to-center separation is 55.0 cm. The spheres are then
connected by a thin conducting wire. When the wire is removed, the
spheres repel each other with an electrostatic force of 0.0369 N.
Of the initial charges on the spheres, with a positive net charge,
what was (a) the negative charge on one of them and (b) the
positive charge on the...

Two identical conducting spheres, fixed in place, attract each
other with an electrostatic force of 0.149 N when their
center-to-center separation is 55.0 cm. The spheres are then
connected by a thin conducting wire. When the wire is removed, the
spheres repel each other with an electrostatic force of 0.0369 N.
Of the initial charges on the spheres, with a positive net charge,
what was (a) the negative charge on one of them and (b) the
positive charge on the...

An experiment is performed in deep space with two uniform
spheres, one with mass 20.0 kg and the other with mass 108.0 kg .
They have equal radii, r = 0.30 m . The spheres are released from
rest with their centers a distance 40.0 m apart. They accelerate
toward each other because of their mutual gravitational attraction.
You can ignore all gravitational forces other than that between the
two spheres.
A. When their centers are a distance 28.0 m...

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