Why aren't heavier elements much larger than lighter elements?
a. Larger nuclear forces pull the electrons into closer orbits.
b. Larger gravitational forces pull electrons into closer orbits.
c. The larger positive charge in the nucleus pulls the electrons into closer orbits.
d. Larger magnetic forces pull electrons into closer orbits.
c. The larger positive charge in the nucleus pulls the electrons into closer orbits.
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Three identical bar magnets, each 2 cm long, are placed in a straight line on a frictionless surface with their ends equally spaced with 2 cm between ends. They are constrained so they cannot rotate, but they can slide along the straight line. The left magnet has its north pole nearest the north pole of the middle magnet, and the right magnet has its south pole toward the middle magnet’s south pole. Once they are in place and released from rest, which of the following best describes the motion of the magnets?
a. The end magnets will move away from the center magnet.
b. The magnets will not move since they are equally spaced.
c. The magnets will snap together.
d. None of the above would happen.
The rotation curve of the outer portions of the Galaxy revealed what about its mass?
What will be an ideal response?
A radar pulse returns 3.0 × 10^-4 s after it was sent out and reflected by an object. What is the separation distance of the radar source and the object?
The force on your left palm is __________ the force on your right palm
a. 1/4 b. 1/2 c. equal to d. 2 times e. 4 times