Particle A has twice as much charge as particle B. Compared to the force on particle A, the force on particle B is
a. ½ as much.
b. 2x as much.
c. 4x as much.
d. The same.
Ans: d. The same.
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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?
A point on a wheel of radius 40 cm that is rotating at a constant 5.0 revolutions per second is located 0.20 m from the axis of rotation. What is the acceleration of that point due to the spin of the wheel?
A) 0.050 m/s2 B) 1.4 m/s2 C) 48 m/s2 D) 200 m/s2 E) 0.00 m/s2
What part of the Copernican model was incorrect?
What will be an ideal response?
Spheres of Charge: In the figure, a conducting sphere of radius r1 = 0.050 m is placed at the center of a spherical conducting shell of inner radius r2 = 0.100 m and outer radius r3 = 0.140 m. The inner sphere carries an excess charge of -4.0 nC. The outer spherical shell carries a net excess charge of 3.0 nC. Calculate the magnitude of the electric field at the following distances r from the center of the spheres. (k = 1/4??0 = 9.0 × 109 N ? m2/C2) (a) r = 0.075 m (in the air space between spheres),(b) r = 0.120 m (in the metal of the spherical shell), and(c) r = 0.200 m (outside the spherical shell).
What will be an ideal response?