All work must be done by each individual. You must show all your workoryo the ri
ID: 1526916 • Letter: A
Question
All work must be done by each individual. You must show all your workoryo the right to refuse credit. 1. A 0.2 kg apple is hanging from a tree 6 meters above the ground. How much potential energy does the apple have? lf the apple falls (the apple is a projectile while falling), how much kinetic The will the apple have right as this the ground? Ignore ai the tree. apple has LaJ of potential energy when it is hanging on The apple will have of kinetic energy as it hits the ground. A0.2 kg apple is hanging from a tree emeters above the ground. Suddenly the branch breaks and the apple falls. after the branch breaks. meters). The apple has Jof kinetic energy right down (3 The apple has J of kinetic energy after it has fallen halfway meters). The apple has of Jpotential energy after it has falien halfway down (3 3. A certain spring has a spring constant of 111 Nim. How much elastic potential energy is in the spring if it is stretched out 0.3 meters? 4. It takes 50 N of force to stretch a certain spring 0.5 meters. NIm What is the spring constant (k) of the spring? meters? How much force would it take to stretch that same spring 0.85 stretched out 0.85 meters? How much elastic potential energy is stored in this spring if it is 5. A bow has a spring constant "k of 3.100 N/m. How far back does a hunter have to draw the 6, You push 10 kg block from the bottom up to the top of a 4m tall ha at constant speed. The a total work done on the object when you push the block up the hil is equal toExplanation / Answer
3 .
given
K = 111 N/m , x = 0.3 m
the elestic potetnial energy = PE = 1/2 K x2
PE = 0.5 X 111 X 0.32
PE = 4.995 J
4 .
a )
using F = K x
K = F / x = 50 / 0.5
K = 100 N/m
b )
next F = K x
F = 100 X 0.85
F = 85 N
c )
PE = 0.5 X K x2
PE = 0.5 X 100 X 0.852
PE = 36.125 J
5.
free body diagram
6.
total energy = m g h
= 10 X 9.8 X 4
= 392 J