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Standing at a crosswalk, you hear a frequency of 550 Hz from the siren of an approaching ambulance.After the ambulance passes, the observed frequency of the siren is475 Hz. Determine the ambulance's speed from these observations. In km/hour
A fighter jet is launched from an aircraft carrier with theaid of its own engines and a steam-powered catapult. Thethrust of its engines is 2.3x105N. What is the work done on the jet by the catapult
A 10cm long animal tendon was found to stretch3.8mm by a force of13.0N. Calculate the elastic modulus of this tendon
A 120 V space heater has two power settings. The equivalent resistance at the two settings are 19 ? and a 37 ?, After making a guess, determine the power at the low setting
An ambulance moving at 42 m/s sounds its siren whose frequency is 450 Hz. a car is moving in the same direction as the ambulance at 25 m/s. what frequency does a person in the car hear as the car approaches the ambulance? After the ambulance passe..
Whenever two Apollo astronauts were on the surface of the Moon, a third astronaut orbited the Moon. Determine the period of the orbit
Standing on ground 3.5 from the wall of a building, you want to throw a package from your 1.6 shoulder level to someone in a second-floor window 4.5 above the ground.
The current through a 1.5 H inductor changes from zero to 1mA in 5 us. How much is the absolute value of self-induced voltage
Use graphical techniques to find out the direction of the dog’s resultant displacement vector. Give the direction of the resultant displacement in degrees (out of 360).
A string with a mass per length of 2.00 gm/m is stretched with a force of 120 N between two points that are 0.400 m apart. What is the length of the organ pipe
question a grindstone of radius 4.0 m is initially spinning with an angular speed of 8.0 rads. the angular speed is
A solid aluminum cylinder with density equal to 2700 kg/m3 has the weight equal to 0.66 N in air and the apparent weight of 0.22 N when immersed in an unknown liquid. What is the density of this liquid
Space vehicles traveling through Earth's radiation belts can intercept a significant number of electrons. The resulting charge buildup can damage electronic components and disrupt operations. Suppose a spherical metallic satellite 1.6 m in diamete..
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