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Heba Taleb
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19 minutes
Question : While you are standing still on the sidewalk, an ambulance traveling at 30 m/s passes you. The ambulance’s siren produces a tone at a frequency of 802 Hz. Assume the speed of sound in air is 343 m/s. What frequency do you hear as the ambulance approaches you? What frequency do you hear as the ambulance moves away from you?
Heba Taleb
19 minutes
Two blocks, each with a mass of 12 kg, are placed on a frictionless horizontal surface and are connected by a massless spring with a spring constant of k=220 N/mk=220 N/m. If you apply a horizontal force of 18 N to one of the blocks, then how much will the spring compress as the boxes accelerate?
Heba Taleb
24 minutes
Draw free body diagram for box on a table
Heba Taleb
5 minutes
EXTERNAL FORCE
Heba Taleb
10 minutes
Sound wave
Heba Taleb
12 minutes
Calculate the gravitational force acting on a 50-kilogram object when it is near the surface of the Earth.
Heba Taleb
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from Norway
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