For the typical "household ac voltage" of 120 V, what is the amplitude of the emf?
A. 120 V
B. 240 V
C. 60.0 V
D. 170 V
E. 330 V
D. 170 V
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Refracting Telescope: A person is designing a telescope with a magnification of 10. If the telescope is limited to a length of 0.20 m, what is the approximate focal length of the objective?
A. 16 cm B. 17 cm C. 18 cm D. 19 cm
Which of the following statements best describes the difference between a refracting telescope and a reflecting telescope?
A) A refracting telescope uses a transparent glass lens to focus light, whereas a reflecting telescope uses a mirror to focus light. B) A refracting telescope produces refracted images, whereas a reflecting telescope produces reflected images. C) Reflecting telescopes make much clearer images than refracting telescopes of the same size. D) It is much easier to make a large refracting telescope than a large reflecting telescope.
Which of the following is not one of the ways sound can be used?
a. to circulate the refrigerant in a refrigerator b. to relay information to orbiting satellites c. to form images of internal organs d. to measure the air temperature aloft e. to make a bubble in water produce light
Two objects collide and stick together. Which of the following is false?
A. momentum is conserved B. kinetic energy is lost C. kinetic energy is conserved D. momentum is lost