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You are driving along a highway at 25.5 m/s when you hear a siren. You look in the rear-view mirror and see a police car approaching you from behind with a constant speed. The frequency of the siren that you hear is 1220. Hz. Right after the police car passes you, the frequency of the siren that you hear is 1170. Hz.
a) How fast was the police car moving?
b) You are so nervous after the police car passes you that you pull off the road and stop. Then you hear another siren, this time from an ambulance approaching from behind. The frequency of its siren that you hear is 1240. Hz. Once it passes, the frequency is 1030. Hz. What is the actual frequency of the ambulance's siren?
Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 1.20×106N, What is the total work done by the two tugboats on the supertanker
While a woman stands with two feet on a scale, the scale reads 490 N. When she lifts one foot, scale reads more or less.
The two stars in a certain binary star system move in circular orbits. The first star, Alpha, has an orbital speed of 36.0km/s. The second star, Beta, What is the mass of the star Beta and alpha
A 7.57- g bullet is moving at 689.00 m/s as it leaves the 0.63- m-long barrel of a rifle. What is the average force on the bullet
Calculate the value of the error (only) with two decimal places for: (5.3 +/- 0.1) / (2.9 +/- 0.1) and (7.3 +/- 0.4) / (3 +/- 0.2)
Compute the value that the spring constant should have so that passengers undergo an acceleration of no more than 7.0 when brought to rest. Let be the total mass of the elevator and passengers.
A prospector finds a solid rock composed of granite (? = 2650 kg/m3) and gold. The volume of the rock is 3.00e-4 m3 and its mass is 3.48 kg. (a) What mass of gold is contained in the rock in kg? (b) What percentage of the rock is gold by volume? (..
An air-traffic controller observes two aircraft on his radar screen. The first is at altitude 750 m, What is the distance between the two aircraft
When you touch a friend after walking across a rug on a dry day, you typically draw a spark of about 2 mm. Estimate the potential diference between you and your friend before the spark
A wire has a mass per unit length of 0.500 g/cm. what is the magnitude and direction of the minimum magnetic field
A stockroom worker pushes a box with a mass 11.2kg on a horizontal surface with a constant speed of 3.50m/s. coefficient of kinetic friction between the box and the surface is 0.20.
A sphere of mass M is supported by a string that passes over a pulley at the end of a horizontal rod of length L, Find the mass of the portion of the string above the rod
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