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in which situation is the object experiencing unbalanced forces?
a) a box resting on a horizontal floor.
b) a car slowing as it reaches a traffic light.
c) a car with its cruise control set to 30 km/h.
d) a penny at terminal velocity after falling off of a building.

Consider a one meter long horizontal pipe with a constant 100 cm^2 cross sectional area. water flows rightward into the pipe at x = 0 with flow velocity 02m/sec at every point within the pipe intake area. at x=1, the rightward flow rate is 0.192 m/sec. assume the water is a conserved quantity in the pipe, so there must be a leak (a sink) somewhere in the pipe. 1. compute net volumetric flow of the source if the system to be in equilibrium. 2. now assume the pipe in the problem has no leaks. compute the net volumetric rate of change for the system.

The force it would take to accelerate an 900-kg car at the rate of 6m/s2

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