Crime scene as the siren approaches
A cop car drives at 30 m/s toward the scene of a crime, with its siren sounding (f = 2125 Hz.) Calculate the frequency heard by people at the crime scene as the siren approaches and the frequency heard as the siren moves away from the people.
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A firefighter of mass 89 kg slides down a vertical pole with an acceleration of 3 m/s2. The acceleration of gravity is 10 m/s2 . What is the friction force that acts on him? Answer in units of N.
if the bucket is raised to the top of the well and released, what is the acceleration of the bucket as it falls toward the bottom of the well? (assume rope's mass is negligible, that cylinder turns on frictionless bearings and that g = 9.8m/s^2
Light of wavelength 520 nm is incident normally on a diffraction grating. Determine the total number of primary maxima that can be observed in this situation.
A simple harmonic oscillator consists of a block of mass 3.50 kg attached to a spring of spring constant 210 N/m. When t = 2.30 s, the position and velocity of the block are x = 0.140 m and v = 2.810 m/s.
a circular plate with radius 1.26 m contains 724 μC of a charge uniformly distributed. Find the magnitude of the electric field near the plate.
The small currents in axons corresponding to nerve impulses produce measurable magnetic fields. A typical axon carries a peak current of 0.040mu*A. What is the strength of the field at a distance of 2.5 mm?
An opaque card is then introduced covering only the upper half of the lens. What happens to the image on the screen?
A severe thunderstorm dumps 1.5 in. of rain in 30 min on a town of area 38 km2. What volume of water, in acre-feet, fell on the town?
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