Question 1: An inventive child wants to reach an apple in a tree without climbing the tree. Sitting in a chair connected to a rope that passes over a frictionless pulley, the child pulls on the loose end of the rope with such a force that the spring scale reads 300 N. The child's true weight is 270 N, and the chair weighs 160 N.   (a) Show that the acceleration of the child-chair system is upward and find its magnitude. _______ m/s2 (b) Find the force the child exerts on the seat of the chair. _________ N

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Question 1:

An inventive child wants to reach an apple in a tree without climbing the tree. Sitting in a chair connected to a rope that passes over a frictionless pulley, the child pulls on the loose end of the rope with such a force that the spring scale reads 300 N. The child's true weight is 270 N, and the chair weighs 160 N.

 

(a) Show that the acceleration of the child-chair system is upward and find its magnitude.
_______ m/s2

(b) Find the force the child exerts on the seat of the chair.

_________ N

 

Question 2:

A high diver of mass 50.0 kg jumps off a board 10.0 m above the water. If her downward motion is stopped 1.90 s after she enters the water, what average force did the water exert on her?

______ N

Question 3:

A 6.90-kg object is initially moving so that its x-component of velocity is 6.00 m/s and y-component of velocity is -1.60 m/s.

(a) What is the kinetic energy of the object at this time?
 _______J

(b) Find the change in kinetic energy of the object it its velocity changes so that its new x-component is 8.50 m/s and its new y-component is 5.00 m/s.
_______ J

 

 

PLEASE ANSWER ALL ASAP!!!

 

 

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