Which of the following is a prime number?
A) 13
B) 21
C) 49
D) 15
A
You might also like to view...
An organ pipe open at both ends is 1.5 m long. A second organ pipe that is closed at one end and open at the other is 0.75 m long. The speed of sound in the room is 330 m/s. Which of the following sets of frequencies consists of frequencies which can be produced by both pipes?
a. 110 Hz, 220 Hz, 330 Hz b. 220 Hz, 440 Hz, 660 Hz c. 110 Hz, 330 Hz, 550 Hz d. 330 Hz, 440 Hz, 550 Hz e. 220 Hz, 660 Hz, 1 100 Hz
A block holding a ringing tuning fork oscillates back and forth, attached to a wall by a spring of spring on a horizontal, frictionless surface, with amplitude 17 cm. The spring constant is 390 N/m. An observer who is situated so that the block’s direction of motion is either directly towards or away from him notes that the frequency he hears varies between 174 and 178 Hz. What is the mass of the tuning fork and block together? The speed of sound at the time of the experiment is 340 m/s.
A. 4.4 kg B. 0.76 kg C. 0.18 kg D. 2.9 kg
The most likely way we could terraform Mars would involve
A) adding greenhouse gases to the atmosphere B) moving the planet closer to the Sun C) restarting Martian volcanoes D) firing projectiles into the polar caps
Magnetic Field of a Long Wire: The magnitude of the magnetic field that a long and extremely thin current-carrying wire produces at a distance of 3.0 µm from the center of the wire is 2.0 × 10-3 T. How much current is flowing through the wire? (?0 = 4? × 10-7 T ? m/A)
A. 30 mA B. 190 mA C. 19 mA D. 380 mA