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A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1380 Hz. The bird-watcher, however, hears a frequency of 1440 Hz. What is the speed of the bird, expressed as a percentage of the speed of sound?
a 25.0 mH inductor is in an AC-circuit with a 150 V ac-source which operates at 60.0Hz. find the inductive reactance
The near point of a naked eye is 30 cm. When an object is placed at the near point and viewed by the naked eye, it has an angular size of 0.053 rad. Determine the angular size of the image
A bird stands on a dc electric transmission line carrying 3300A (Figure 1) . The line has 2.7×10?5? resistance per meter, and the bird's feet are 3.5cm apart
q1. vector is along a measured trail and is 1310 m in a direction 27.0 deg north of east. vector is not along a
A converging lens of focal length 77.0 cm. is placed 52.0 cm. behind a diverging lens. What is the absolute value of the focal length (in centimeters) of the diverging lens
Sally expends 10320 J of energy to drag a wooden crate 24.7 m across a floor with a constant speed. The rope makes an angle of 48.0° with the horizontal. How much force does the rope exert on the crate
a 3,000-kg vehicle collides with a 1,000-kg stationary vehicle. What was the speed of the 3,000-kg vehicle
A device called a velocity selector is a tube with a crossed electric and magnetic fields set up so that the particle entering with a velocity v_0 along the axis of the tube experiences zero net force.
Standing at a crosswalk, you hear a frequency of 500 Hz from a siren of an approaching ambulance. Determine the ambulance's speed from these observations
A duck is floating on a lake with 28% of its volume beneath the water. What is the average density of the duck
a 57 kg researcher absorbs 6.3*10^8 neutrons in a workday. The energy of the neutrons is 2.6 MeV. What is the equivalent dosage of the radiation exposure
What is the safe operating voltage for a 100 Ohm, 1/10W resistor, How much power is dissipated at half the maximum voltage
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