The direction of a field line at a point in space shows the direction of the force that would act on a body placed at the point
Indicate whether the statement is true or false
T
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An alloy of 73.9 atomic % tin (Sn) and 26.1 atomic % lead (Pb) is mixed and heated to 250°C. See the lead tin phase diagram in Figure 5.11a.
(a) At 250°C what phases are present, what are their chemical compositions, and what is the atom fraction of each phase?
(b) This Pb-Sn mixture is then cooled to room temperature (25°C). What phases are present, what are their chemical compositions, and what is the atom fraction of each phase present?
After a high-mass star explodes in a supernova, what is left behind?
A) always a white dwarf B) always a neutron star C) always a black hole D) almost always either a white dwarf or a neutron star E) almost always either a neutron star or a black hole
Particle 1 with charge q1, and particle 2, with a charge q2, are on the x axis, with particle 1 at x = a with and particle 2 at x = -2a. For the net force on a third charged particle, at the origin to be zero q1 and q2 must be related by q2=:
A) 2q1 B) 4q1 C) -2q1 D) -4q1 E) -q1/4
To "spear" a blue fish with a red laser beam and compensate for refraction, aim your laser
A) directly at the sighted fish. B) above the sighted fish. C) below the sighted fish.