Energy from the Sun arrives at the top of Earth’s atmosphere with an intensity of 1400 W/m2. How long does it take for 1.80109 J to arrive on an area of 1.00 m2?

A cable with a linear density of =0.2 kg/m is hung from telephone poles. The tension in the cable is 500.00 N. The distance between poles is 20 meters. The wind blows across the line, causing the cable resonate. A standing waves pattern is produced that has 4.5 wavelengths between the two poles. The air temperature is T=20C . What are the frequency and wavelength of the hum?

On a particular day the speed of sound in air is 340 m/s. If a plane flies at a speed of 680 m/s, is its Mach number (a) 1.5, (b) 2.0, (c) 2.5, or (d) 2.7?

A train moving at a speed of 220 ms–1 towards a stationary object, emits a sound of frequency 1000 Hz.Some of the sound reaching the object gets reflected back to the train as echo. The frequency of the echo asdetected by the driver of the train is - (speed of sound in air is 330 ms–1)

# 18. A police car sounding a siren with a frequency of 1.580 [kHz] is km] traveling at 120.0 Consider the speed of sound sound = 340 [] hr (a) What frequencies does an observer standing next to the road hear as the car approaches and as it recedes? [km] hr (b) What frequencies are heard in a car traveling at 90.0 [] in the opposite direction before and after passing the police car?

21- a) An ambulance moving with a speed of V, m/s, produces a siren of frequency 416HZ, approaches an observer B, who is moving in the opposite direction with a speed of 26 m/s. If the frequency heard by the observer B is 656 Hz, and the speed of the sound is 342 m/s, calculate the A. Speed of the ambulance V, in m/s b) If now, the observer A is receding from the ambulance with the same speed as the observer B, calculate the Frequency of the sound heard by the observer A, in hertz:

. (II) Two automobiles are equipped with the same singlefrequency horn. When one is at rest and the other is moving toward the first at 18 m/s  the driver at rest hears a beat frequency of 4.5 Hz. What is the frequency the horns emit? Assume T = 20°C

[a] A fast-moving vehicle passes you traveling at Y meters per second while you are standing on the sidewalk. If its engine produces sound at X Hz, at what frequency will you hear the sound? You may find the equations given in Section 17.4 of the OpenStax College Physics text helpful. 1 = 1. 5 x = 31 Ihl Wato TO-XOXYYZ 1 TIL

(II) Two automobiles are equipped with the same singlefrequency horn. When one is at rest and the other is moving toward the first at 18m/s the driver at rest hears a beat frequency of 4.5 Hz. What is the frequency the horns emit? Assume T = 20°C