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emiliolovato
08.07.2019 •
Physics
Jogger a has a mass m and a speed v, jogger b has a mass m/3 and a speed 3v, jogger c has a mass 4m and a speed v/3, and jogger d has a mass 3m and a speed v/2. rank the joggers in order of increasing kinetic energy. indicate ties where appropriate.
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Ответ:
Kinetic energy for C < Kinetic energy for D < Kinetic energy for A < Kinetic energy for B
Explanation:
For jogger A
mass = m , speed = v
Kinetic energy of A = 0.5 x m v^2
For jogger B
mass = m/3, speed = 3v
Kinetic energy for B = 0.5 x m/3 x (3v)^2 = 1.5 x mv^2
For jogger C
mass = 4m, speed = v/3
Kinetic energy for C = 0.5 x 4 m x (v/3)^2 = 0.22 m v^2
For jogger D
mass = 3 m, speed = v/2
Kinetic energy for D = 0.5 x 3 m x (v/2)^2 = 0.375 mv^2
So, order for increasing kinetic energy
Kinetic energy for C < Kinetic energy for D < Kinetic energy for A < Kinetic energy for B
Ответ:
C. 8 m/s east
is your answer.