A steel ball has a mass equal to 5 kilograms. What is the ball's weight?
49 N
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If the lens in a person's eye is too highly curved, this person is suffering from
A) farsightedness. B) spherical aberration. C) astigmatism. D) chromatic aberration. E) nearsightedness.
A rock from a volcanic eruption is launched straight up into the air with no appreciable air resistance. Which one of the following statements about this rock while it is in the air is correct?
A) On the way up, its acceleration is downward and its velocity is upward, and at the highest point both its velocity and acceleration are zero. B) On the way down, both its velocity and acceleration are downward, and at the highest point both its velocity and acceleration are zero. C) Throughout the motion, the acceleration is downward, and the velocity is always in the same direction as the acceleration. D) The acceleration is downward at all points in the motion. E) The acceleration is downward at all points in the motion except that is zero at the highest point.
Which statement is NOT true?
a. A transformer contains a primary coil of wire and a secondary coil of wire wound around the same iron core. b. A transformer changes one voltage to another. c. A transformer works because changing magnetic fields can induce electric fields. d. A transformer operates on direct current as well as on alternating current. e. Transformers are commonly used for delivering household electric power.
The R value of fiberglass batting, 3.5 inches thick, is 11 ft2/°F/h/BTU. What is the thermal conductivity (in BTU/ft/°F/s)?
a. 7.4 × 10^?6 b. 2.7 × 10^?2 c. 8.9 × 10^?5 d. 1.4 × 10^?4 e. 3.6 × 10^?3