A resonating glass tube closed at one end is 3.6 cm wide and 31.2 cm long. What are the frequencies of the first two harmonics for the resonating tube? The speed of sound in air at this temperature is 351 m/s. Group of answer choices

2.81 Hz, 8.43 Hz

281 Hz, 562 Hz

281 Hz, 843 Hz

562 Hz, 1686 Hz

How would a small bar magnet be oriented when placed at position x?

Two point charges are on the y axis. a 3.90-µc charge is located at y = 1.25 cm, and a -2.4-µc charge is located at y = −1.80 cm. (a) find the total electric potential at the origin. v (b) find the total electric potential at the point whose coordinates are (1.50 cm, 0). v

Greg drew a diagram to compare two of the fundamental forces. which labels belong in the areas marked x, y and z? gravitational force electromagnetic force x. attractive y repulsive z: infinite range x: infinite range y attractive z. repulsive x. always attractive y: infinite range z: attractive or repulsive x. attractive or repulsive y infinite range z: always attractive