Answer:
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Explanation:
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b) all atoms of the same element have the same mass
c)atoms contain subatomic particles
d) a compound contains atoms of more than one element
pushed with a force of 378 N exerted downward at an angle of 25.6◦ below the horizontal.
Find µk between the box and the floor.
Answer:
Approximately , assuming that the floor is level.
Explanation:
Between two surfaces that are moving relative to one another, the coefficient of kinetic friction is equal to the ratio between friction and normal force.
Since the box in this question is moving at a constant speed, the box would be in a translational equilibrium. Forces on this box should be balanced in both the horizontal component and the vertical component.
The value of in this question can be found in the following steps:
At an angle of from the horizontal, magnitude of the vertical and horizontal components of the external force would be:
Assume that the floor is level. Forces on this object in the horizontal direction would include:
Forces on this object are balanced in the horizontal direction. Hence, the magnitude of friction would be equal to that of the horizontal component of the external force:
.
Forces on this object in the vertical direction would include:
Forces on this object in the vertical direction are also balanced. The magnitude of the normal force (pointing upward) should be equal to the sum of the magnitude of the two forces pointing downward:
.
It is given that the magnitude of the weight of this object is . To find the coefficient of kinetic friction, divide the magnitude of friction by the magnitude of the normal force:
.
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