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Q. Two ambulances move toward each other on a straight road. Each travels at a speed of 65 mph. The siren on each ambulance produces a sound wave of frequency 460 Hz. (Take the speed of sound in air to be 340 m/s.)
(i) The driver of each ambulance hears the other's siren and hears a beat note between the frequency of his own siren and the siren of the other ambulance. What is the frequency of the beat note? (ii) A passerby stands midway between the two ambulances. What is the frequency of the beat note between two sirens that he hears?
What is mechanical energy
Heather and Jerry are standing on a bridge 51 above a river. Heather throws a rock straight down with a speed of 12. Jerry, at accurately the same instant of time, throws a rock straight up with the same speed. Ignore air resistance.
A student shoots spitball at the wall from a height of 1.50 meters. The spitball has an initial horizontal velocity of Vxo, other than has no vertical velocity component. The spitball lands on the ground 8 meters from where it was shot. What is the V..
make sure to label the graphs with units and values to indicate any critical points of the ball's motion.
blocks are lined up in a row on a frictionless table. How much force does the 8.0 block exert on the 7 block.
A penny sits on a rotating disk that rotates once every 0.9 s. The coefficients of static and kinetic friction between the penny and disk are 0.58 and 0.48, respectively. For the penny to not slide, what is its largest distance from the center of the..
A 10 capacitor initially charged to 30 is discharged through a 1.2 resistor. How long does it take to reduce the capacitor's charge to 7.
An 8,000 rocket is shot straight up from the Earth's surface with the initial speed of 800 m/s. How high does it go.
To determine the location of her center of mass, a physics student lies on the lightweight plank supported by two scales 2.50 apart, as indicated . If left scale reads 300 , and right scale reads 122 .
Water is in the big beaker. Scale 1 reads 87 newtons, scale 2 reads 948 newtons, and scale 3 reads 0 newtons. The hanging block has a density of 10 × 10^3 kg/m3. To the nearest tenth of newton what does scale 1 read after the block is fully lowere..
An electric field of intensity 2.5 kN/C is applied along the x-axis. Calculate the electric flux through a rectangular plane 0.350 m wide and 0.70 m long if the following conditions are true.
What happens to support force on the workmens feet
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