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A siren has a frequency of 875 Hz when it and an observer are both at rest. The observer then starts to move and finds that the frequency he hears is 1251 Hz.
(a) Is the observer moving toward or away from the siren?
1)The observer is moving away from the siren
2)The observer is moving toward the siren
(b) What is the speed of the observer? (Use 343m/s as the speed of sound).
If a car traveling at 62 km/h will skid 22 m as its brakes lock, how far will it skid if it is traveling at 120 km/h when its brakes lock.
submarine on the ocean surface receives a sonar echo indicating an underwater object. What is the object's depth
The four tires on the author's car are inflated to an absolute pressure of 2.8 multiply.gif 105 Pa.what is the contact area between each tire and the ground
A thermos contains 156 cm3 of coffee at 87.6 °C. To cool the coffee, you drop two 11.5-g ice cubes into the thermos. What is the final temperature of the coffee in degrees Celsius
One mole of a monatomic gass initially at 273 K and 1 atm is compressed isothermally (T constant) from volume 22.4 L to 11. 4 L, Find the final pressure and draw a PV diagram, Labeling the initial and final states 1 and 2
A 3000-kg Ferris wheel accelerates from rest to an angular speed of 0.17rad/s in 11s, What is the net torque on the wheel
a thin rod of length 10.3m and mass 20kg is supported at a 30 degree incline. one support is 2.4m and the other is 8.3m from the lower end of the rod, Find the normal force exerted on the rod by the upper support answer in units of N
A diverging lens (f = â€"12.0 cm) is located 23.0 cm to the left of a converging lens (f = 35.0 cm). Determine the distance of the final image relative to the converging lens
What is moment of inertia
The output voltage of an AC generator is given by ?v = (120 V) sin (50?t). The generator is connected across a 25.0-? resistor. Find the power delivered to the resistor
A very long, straight solenoid with a cross-sectional area of 2.30cm2 is wound with 93.4turns of wire per centimeter. What is the magnitude of the emf induced in the secondary winding at the instant that the current in the solenoid is 3.2
A 2.0cm×2.0cm×6.0cm block floats in water with its long axis vertical. The length of the block above water is 1.0cm
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