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Q. A train sounds its horn as it approaches an intersection. The horn can just be heard at a level of 50 dB by an observer 10km away.
(i) What is the average power generated by the horn?
(ii) What intensity level of the horn's sound is observed by somebody waiting at an intersection 58m from the train?
The pilot of an aircraft wishes to fly due west in a 37.70 km/h wind blowing toward the south. The speed of the aircraft in the absence of the wind is 191 km/h.
A boy shoots a BB gun horizontally at a target 15 m away. The gun is aimed directly at the center of the target, but the small metal BB hits 56 cm lower. avoid any air resistance, what was the initial speed of the BB.
A U-shaped tube is open to the air at both ends and is partially filled with Mercury (density = 13,600 kg/m3). Water (density = 1000 kg/m3) is poured into the left arm until the water is 10 cm deep. How long upward from its initial position does t..
Runner A is at first 6.60 km west of a flagpole and is running with a constant velocity of 6.4 km/h due east. Runner B is firstly 7.20 km east of the flagpole and is running with a constant velocity of 8.80 km/h due west.
New physics student having trouble with hw, not sure how to set this up or find the answer. Throw a ball straight up with an initial vel. of 18.5m/s. if ball is caught at the same height it was released, and then compute the max. Height achieved b..
What is the maximum speed the car. A roller-coaster car speeds down a hill past point A where R1 = 8.0 m and then rolls up a hill past point B where R2 = 15.0 m.
A 3.80 m-long, 430 kg steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 66.0 kg construction worker stands at the far end of the beam. What is the magnitude of torque abou..
A 1.2µF capacitor is charged to a potential difference of 11.0V. The wires connecting the capacitor to the battery are next disconnected from the battery and connected across a second, initially uncharged, capacitor. The potential difference across t..
With the battery disconnected the compass needle points to the right, in the plane of the coil. The apparatus is located near equator, where the Earth's magnetic field B Earth is horizontal, with a magnitude of 4×10-5 tesla. (Presume that B Earth ..
The metal equilateral triangle in the figure, 20 {rm cm} on each side, is halfway into a 0.10 {rm T} magnetic field.What is the magnetic flux through triangle.
An airplane pilot wishes to fly due west. A wind of 88.0 km/h is blowing toward the south. What is the speed of plane over the ground in km/h.
In a head-on collision, a car stops in 0.29 {s} from the speed of 28 {m/s}. The driver has a mass of 78 {kg}, and is, fortunately, tightly strapped into his seat. what force is applied to driver during that fraction of a second.
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