Which of the following physical properties is not associated with a solid that has covalent bonding between all atoms?
(a) Low melting temperature
(b) High hardness
(c) Electrical insulator
(d) Brittle fracture
(a) Low melting temperature
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All materials or substances have heat in them until their temperature reaches what level?
The solar winds blow outward from
A) coronal holes. B) sunspots. C) flares. D) the entire photosphere. E) the Sun's poles only.
As an object moves from point A to point B only two forces act on it: one force is conservative and does ?70 J of work, the other force is nonconservative and does +50 J of work. Between A and B, a. the kinetic energy of object increases, mechanical energy increases
b. the kinetic energy of object decreases, mechanical energy increases. c. the kinetic energy of object decreases, mechanical energy decreases. d. the kinetic energy of object increases, mechanical energy decreases. e. None of the above.
A circular loop of wire of radius 10 cm carries a current of 6A. The magnitude of the magnetic field at the center of the loop is
A) 3.8 × 10-5 T. B) 3.8 × 10-7 T. C) 1.2 × 10-5 T. D) 1.2 × 10-7 T. E) 3.8 × 10-8 T.