For a short time the position of a roller-coaster car along its path is defined by the equations r=25 m, θ=(0.3t) rad, and z=(−8
cosθ) m, where t is measured in seconds, Determine the magnitudes of the car's velocity and acceleration when t=4s .
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Answer:
The energy unit is expressed as kg-m/s or Joules.
Explanation:
The relationship between mass and energy in physics is represented by:
Where
m denotes the mass of the object
c signifies the speed of light
In the SI system, mass is measured in kilograms and the speed of light in m/s. Therefore, energy is defined in kg-m/s, which is equal to Joules.
Thus, the appropriate SI unit for energy is kg-m/s or Joules. This concludes the explanation.