A 25.0 cm long organ pipe is filled with air and is open at one end and closed at the other. The velocity of sound in air at 0
is 331 m/s. What is the frequency of the fifth mode?
A. 1,550 Hz
B. 1,750 Hz
C. 2,320 Hz
D. 2,720 Hz
E. 3,170 Hz
C. 2,320 Hz
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Which of the following planets can be seen as a crescent phase from Earth?
a. Mercury b. Venus c. Mars d. Mercury and Venus e. All of the other choices are correct.
A silver dollar, a quarter, and a penny (these are in order of decreasing diameter) lie at the bottom of a wishing well filled with water. The coin experiencing the largest downward force on its top surface due to the water pressure is the
A. silver dollar. B. penny. C. quarter. D. All of these choices experience the same downward force
An electron moves with a speed of 8.0 × 106 m/s along the +x-axis. It enters a region where there is a magnetic field of 2.5 T,
directed at an angle of 60° to the +x-axis and lying in the xy-plane. (1 eV = 1.60 × 10-19 C, mel = 9.11 × 10-31 kg) Calculate the magnitude of (a) the magnetic force on the electron. (b) the acceleration of the electron.
A spaceship of mass 106 kg is to be accelerated to 0.60c. How much energy does this require?
a. 2.3 × 10^22 J c. 2.5 × 10^23 J b. 6.0 × 10^22 J d. 1.5 × 10^23 J