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6. A person weighs 764 N on the surface of Earth and 5320 N on the surface of another planet. What is the acceleration due to gravity on the other planet?
7. A person is standing motionless between a straight highway and an airport runway. A truck drives by the person at constant speed, while an airplane accelerates down the runway for take off. Of the person, truck, and airplane, which are an inertial frame of reference?
Explanation & Answer
6)
First, the mass on earth: 764/9.8ms^-2 = 75.6kg
f=mass*acceleration, so
acceleration=force/mass
a = 5320N/75.6kg = 70.36 m/s^2
7)
Trick question: Both the person AND the truck are inertial frames of reference. The person because they are standing still, and the truck because it is moving at a constant velocity.
The plane IS NOT because it is accelerating :)
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