A door has a height of 2.1 m along a y axis that extends vertically upward and a width of 0.975 m along an x axis that extends outward from the hinged edge of the door. A hinge 0.47 m from the top and a hinge 0.47 m from the bottom each support half the door's mass, which is 29 kg. In unit-vector notation, what are the forces on the door at (a) the top hinge and (b) the bottom hinge

downward

Explanation:

As each hinge supports half the door mass, which is 29kg, then each of them are subjected to 29/2 = 14.5 kg of door mass. Let g = 9.81 m/s2, the weight on each hinge would be:

acting downward

In unit-vector notation, the force vectors on the top and the bottom hinges are:

downward

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is

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