A door has a height of 2.1 m along a y axis that extends vertically upward and a width of 0.830 m along an x axis that extends outward from the hinged edge of the door. A hinge 0.41 m from the top and a hinge 0.41 m from the bottom each support half the door's mass, which is 20 kg. In unit-vector notation, what are the forces on the door at (a) the top hinge and (b) the bottom hinge

Mass (kg) force (n) 5 25 10 50 15 75 20 100 a student was trying to find the relationship between mass and force. he placed four different masses on a table and pulled them using a spring scale. the table shows the different masses used in the experiment and the force required to pull each mass. the student concluded that more force was required to pull heavier objects. what comment would you make regarding his conclusion? a) no clear relation can be observed between mass and force from the data. b) there is a direct proportion between the mass and force listed in the table. c) gravity should have been taken into account while performing the experiment. d) there is an inverse proportion between the mass and force listed in the table.

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?