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.
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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.
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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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