An atom that has more protons than electrons is a ______________ ion
a. neutral
b. positive
c. negative
d. polyatomic
b
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Which casting technique is appropriate for a very complex metal shape that cannot be removed from a mold?
(a) Sand mold (b) Permanent mold (c) Die (d) Investment
If the acceleration of an object is zero, then that object cannot be moving
A) True B) False
A solid sphere, a solid cylinder, and a hoop all have the same mass and radius. Each are sent down identical inclined planes starting from rest. Their kinetic energies at the bottom of the incline are Ksphere,Kcylinder, and Khoop. Which of the following is true?
A. Ksphere>Kcylinder B. Khoop>Ksphere C. Khoop>Kcylinder D. Kcylinder>Khoop E. No answer above is correct.
Solenoid: An ideal solenoid is wound with 470 turns on a wooden form that is 4.0 cm in diameter and 50 cm long. The windings carry a current in the sense shown in the figure. The current produces a magnetic field of magnitude 4.1 mT, at the center of the solenoid. What is the current I in the solenoid windings? (?0 = 4? × 10-7 T ? m/A)
A. 3.5 A B. 3.0 A C. 2.6 A D. 4.3 A E. 3.9 A