A force F pushes on a 25 kg box as shown in the figure. (a) The coefficient of static friction between box and incline is us = 0.20. How large a horizontal force must push on the block if the block is to be on the verge of sliding up the incline? 25 kg 40. 40 (b) A force F applied to an object of mass mi produces an acceleration of 3 m/s?. The same force applied to a second object of mass m2 produces an acceleration of 1 m/s?. If m and m2 are combined, find their acceleration under the action of the force F?

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A force F pushes on a 25 kg box as shown in the figure.
(a)
The coefficient of static friction between box and incline
is us = 0.20. How large a horizontal force must push on
the block if the block is to be on the verge of sliding up
the incline?
25 kg
40.
40
(b) A force F applied to an object of mass mi produces an
acceleration of 3 m/s?. The same force applied to a second object of mass m2 produces an acceleration of 1
m/s?. If m and m2 are combined, find their acceleration under the action of the force F?
Transcribed Image Text:A force F pushes on a 25 kg box as shown in the figure. (a) The coefficient of static friction between box and incline is us = 0.20. How large a horizontal force must push on the block if the block is to be on the verge of sliding up the incline? 25 kg 40. 40 (b) A force F applied to an object of mass mi produces an acceleration of 3 m/s?. The same force applied to a second object of mass m2 produces an acceleration of 1 m/s?. If m and m2 are combined, find their acceleration under the action of the force F?
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