A 200-Kg Uniform Door Has a Width of 1

question 97

Short Answer

A 20.0-kg uniform door has a width of 1.20 m and a height of 2.50 m. The door is mounted on a post by a pair of hinges, marked 1 and 2 in the figure, at the top and bottom of the door. An external force of 60.0 N, at an angle of 30.0° above the horizontal, is applied to the small doorknob, as shown in the figure. The doorknob is 1.00 m above the bottom of the door.
(a) Find the x component of the force that hinge 1 exerts on the door at the top.
(b) Find the SUM of the y components of the forces that hinges 1 and 2 together exert on the door.

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Definitions:

Variable-ratio Schedule

A reinforcement strategy in which a response is rewarded after an unpredictable number of responses, often used in gambling.

Response Rate

The proportion of people who respond to a specific call-to-action, questionnaire, or experiment out of the total number solicited.

Punishment

A process through which the likelihood of a behavior's occurrence is decreased by presenting an adverse stimulus or removing a desirable stimulus following the behavior.

Extinguish

In psychology, to diminish the occurrence of a conditioned response by repeatedly presenting the conditioned stimulus without the unconditioned stimulus.