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When an ambulance is stationary, the siren gives off a sound at a frequency of 500Hz. In answering the following questions assume that the speed of sound is 340 m/s.
a.) What is the frequency of the stationary siren as perceived by an observer in a car driving toward the ambulance at 25 m/s?
b.)What is the frequency of the stationary siren as perceived by an observer in a car driving past the ambulance at a speed of 25 m/s?
c.) Would the answers found in parts a. and b. above turn out to be the same if the observer was stationary and the ambulance was traveling toward and past the observer at 25 m/s? Clearly and briefly explain why or why not.
Tension is maintained in a string as in the figure below. The observed wave speed is v = 21.0 m/s when the suspended mass is m = 3.00 kg. What is the mass per unit length of the string
Two identical capacitors are connected in parallel to an ac generator that has a frequency of 574 Hz and produces a voltage of 24 V. What is the capacitance of each capacitor
A very massive object -almost innitely massive - moving with velocity v1 = 100m/s hits a very light object - "massless" - at rest. What is the final velocity of the very light object
What is the mass in grams of 1L of helium gas as STP? (Find moles and then convert moles to grams; atomic mass =4.0grams/mol), Why do helium balloons float
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A cannon is aimed at an angle of 30 degrees above the horizontal. It fires a cannonball into the direction of a valley with a muzzle velocity of 100m/s. What is the maximum height of the ball
A water slide launches a child horizontally above a swimming pool. How far from the launch point does the child land in the water
In order to view the craters of the Moon, you construct a refracting telescope from a lens with focal length 90.7 cm as its objective and a 11.5-cm focal length lens as its eyepiece
In attempting to pass the puck to a teammate, a hockey player gives it an initial speed of 2.1 m/s. What minimum initial speed should the puck have been given so that it reached the teammate
A rock of mass 44 kg accidentally breaks loose from edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 252 N. What is the magnitude of the acceleration of the rock?
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