Khufra works at a spring factory and he was assigned to test a certain spring, whose constant is 50 N/m, attached to a 50-kg block in an incline 30°. With the spring initially at equilibrium position, the block was pushed 0.3 meters up the incline by a 50-N external force applied parallel to the path. The coefficient of kinetic friction is 0.30. How much work is done by the spring (in Joules) on the block? (Please explain the solution)

College Physics
10th Edition
ISBN:9781285737027
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter10: Thermal Physics
Section: Chapter Questions
Problem 53AP
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Khufra works at a spring factory and he was assigned to test a certain spring, whose constant is 50 N/m, attached to a 50-kg block in an incline 30°. With the spring initially at equilibrium position, the block was pushed 0.3 meters up the incline by a 50-N external force applied parallel to the path. The coefficient of kinetic friction is 0.30. How much work is done by the spring (in Joules) on the block? (Please explain the solution)
W₁ = Ui-U₁ = = (4x₁²" -AX₁²¹)
=
* (4.9²-4.6²)
-X (49²-4.6%)
-150 (9.5) (0.5)
= 71.25 J
F4
H
AXI
KAX, -mgsin 30°
S6AX, 09.8
Ax₁ = 49m
AX₁ = 4.9 -0.²
- 4.6m
x x 9.8/2
Transcribed Image Text:W₁ = Ui-U₁ = = (4x₁²" -AX₁²¹) = * (4.9²-4.6²) -X (49²-4.6%) -150 (9.5) (0.5) = 71.25 J F4 H AXI KAX, -mgsin 30° S6AX, 09.8 Ax₁ = 49m AX₁ = 4.9 -0.² - 4.6m x x 9.8/2
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