A negatively charged rod is brought near a metal can that rests on a wooden table. You touch the opposite side of the can momentarily with your finger. The can then becomes
A) positively charged.
B) negatively charged.
C) uncharged.
Answer: A
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For a binary phase diagram in a two-phase region, use the _____________rule to find the atom or weight fraction of the phases present.
Fill in the blank(s) with the appropriate word(s).
A coil is wrapped with 300 turns of wire on the perimeter of a circular frame (radius = 8.0 cm). Each turn has the same area, equal to that of the frame. A uniform magnetic field is turned on perpendicular to the plane of the coil. This field changes at a constant rate from 20 to 80 mT in a time of 20 ms. What is the magnitude of the induced emf in the coil at the instant the magnetic field has a magnitude of 50 mT?
A. 24 V B. 18 V C. 15 V D. 10 V E. 30 V
If a tree is 15 m tall, its height expressed in feet is x ft, where x is
A) less than 15. B) greater than 15.
A person uses corrective glasses of power -8.5 D that are worn 2.0 cm from her eye
(a) Is she nearsighted or farsighted? (b) What is her far point without glasses?