Consider a human heart rate of 80 beats per minute. If someone's heart beats at that rate over a 70-yr lifetime, how many times would it beat?
A) 2.20 × 109
B) 7.44 × 105
C) 3.26 × 1010
D) 2.95 × 109
E) 1.78 × 107
D
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Light travels from inside a building to outside through a pane of glass. Which of the following is true regarding the phase change upon reflection in the case?
a. A 180o phase change occurs at the inside surface but not at the outside surface. b. A 180o phase change occurs at the outside surface but not at the inside surface. c. A 180o phase change occurs at both the inside surface and the outside surface. d. No phase change occurs at either the inside surface or the outside surface of the glass.
When two organ pipes open at both ends sound a perfect fifth, such as two notes with fundamental frequencies at 440 Hz and 660 Hz, both pipes produce overtones. Which choice below correctly describes overtones present in both pipes?
a. 440, 880 and 1 320 Hz. b. 660, 1 320 and 1 980 Hz. c. 880, 1 320 and 1 760 Hz. d. 1 320, 2 640 and 3 960 Hz. e. They have no overtones in common.
Which of these is NOT typical of a condensing protostar?
A) magnetic fields producing polar flows B) dusty disks around their equators C) Herbig-Haro objects projecting a light year out in space D) fusion of helium into carbon in their cores E) more infrared than visible light given off from the cocoon of dust around the star
If the period of a pendulum is tripled, then by factor is the length of the string increased?
a. 3 b. 6 c. 9 d. 1/3