For a swinging pendulum, the maximum angle that the pendulum’s string makes with the vertical corresponds to what in the pendulum solution ? = A cos (? t + ?)?

A. A
B. ?
C. ?
D. Something else (specify)


A. A

Physics & Space Science

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Intensity of Sound: A certain factory whistle can be heard up to a distance of 9.8 km. Assuming that the acoustic output of the whistle is uniform in all directions, at what distance from the factory is the intensity level of the whistle sound equal to 25 dB? The threshold of human hearing is 1.0 × 10-12 W/m2.

A. 550 m B. 660 m C. 830 m D. 940 m E. 1100 m

Physics & Space Science

A long telephone pole (wood density 0.80 kg/m3 ) is vertically lowered into a slightly larger vertical pipe which is filled with salt water of density 1.04 kg/m3. The pole ends up floating with what percent of the pole above the water?

What will be an ideal response?

Physics & Space Science

The difference between speed and velocity is that ________

A) velocity is calculated using a physics equation B) velocity is the same as acceleration but speed is different C) they are expressed in different units D) velocity also includes a direction

Physics & Space Science

What is the wavelength of a photon having energy 2.00 eV? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)

What will be an ideal response?

Physics & Space Science