A tall cell-phone tower is 12 cm in diameter over much of the height. A wind blows at 25 m/s. The frequency of the vortices being shed from the tower is nearest:
(A) 44 Hz
(B) 33 Hz
(C) 22 Hz
(D) 0 Hz
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Indicate whether the statement is true or false
Impulse: During World War I, Germany used a "Big Bertha" cannon to hurl shells into Paris 30 miles away. This gun also had a very long barrel. What was the reason for using a long barrel in these guns?
A. to exert a larger force on the shells B. to reduce frictional losses C. to allow the force of the expanding gases from the gunpowder to act for a longer time D. to increase the force exerted on the bullet due to the expanding gases from the gunpowder E. to reduce the force exerted on the bullet due to the expanding gases from the gunpowder
Monochromatic light shines on a surface with work function 1.80 eV. The maximum energy of the emitted photoelectrons is 0.620 eV. What is the wavelength of the monochromatic light?
A. 200 nm B. 290 nm C. 689 nm D. 602 nm E. 512 nm
Momentum: An object with a mass of 0.456-kg is moving at 1.20 × 108 m/s. What is the magnitude of its momentum? (c = 3.00 × 108 m/s)
A. 5.47 × 107 kg ? m/s B. 5.57 × 107 kg ? m/s C. 5.67 × 107 kg ? m/s D. 5.87 × 107 kg ? m/s E. 5.97 × 107 kg ? m/s