O NOT WRITE ON TEST
PLEASE DO NOT
her students to produce an ene
wire. They connected one end
20) During physical science, Ms. Greene challe
wrapped a 4-inch nail with a coil of lily
switch. They connected the other terminal or
to the other terminal of the battery.
can energy transformation James
nnected the other terminal of the knife swits
e battery. Finally, they connected
mation James and Jill
coil to one terminal of a knife
hey connected the end of the coil
James held the tip ofa l-inch nail near the
opened it. The 1-inch nail was pulled toward
end of the 4-inch nail Jill closed the
nch nail was pulled toward the 4-inch nail
closed the knife switch quickly and then
James and Jill used a battery as a source of electric
the nail to move,
that created
energy that caused
A) motor, electrical
B) generator, magnetic
C) generator, electrical
D) electromagnet; magnetic
21)
2
1

What is magnetic flux? explain faraday's law of induction.

Use the profile illustrated for problem (1). assume that the layer of silty sand fill (sm) is placed over the entire site. estimate the thickness of the fill (h - in feet) that will cause the effective vertical stress at the center of the clay layer to increase by 517.5 pounds per square foot.

Assume that two of the electrons at the negative terminal have attached themselves to a nearby neutral atom. there is now a negative ion with a charge -2e at this terminal. what are the electric potential and electric potential energy of the negative ion relative to the electron? the electric potential and the electric potential energy are both twice as much. the electric potential is twice as much and the electric potential energy is the same. the electric potential is the same and the electric potential energy is twice as much. the electric potential and the electric potential energy are both the same. the electric potential is the same and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron. the electric potential is twice as much and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron.