9. A spring has a natural length of 20 cm. A 40 N force is required to stretch the spring to a length of 30 cm. How much work (in Joules) is done in stretching the spring from 35 cm to 38 cm ? [Note: 1 Joule= 1 Newton-meter ] (A) 1.25 (B) 1.98 (C) 3.52 (D) 4.00

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Chapter6: Energy Of A System
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Answer 9 UPVOTE WILL BE GIVEN. PLEASE WRITE THE COMPLETE SOLUTIONS LEGIBLY. NO LONG EXPLANATION NEEDED. BOX THE FINAL ANSWER.
8. If an ideal spring is stretched x units beyond its natural length, then according to Hooke's law the spring
pulls back with a force f(x) equals to
a. X
b. kx
c. k
d. kx²
9. A spring has a natural length of 20 cm. A 40 N force is required to stretch the spring to a
length of 30 cm. How much work (in Joules) is done in stretching the spring from 35 cm to 38
cm ?
[Note: 1 Joule= 1 Newton-meter ]
(A) 1.25
(B) 1.98
(C) 3.52
(D) 4.00
10. A tank full of water is in the shape of a box 3m deep, 4m long and 3m wide. What is the differential
volume?
a. 6dy
b. 12dy
c. 12 π dy
d.
2.25dy
Transcribed Image Text:8. If an ideal spring is stretched x units beyond its natural length, then according to Hooke's law the spring pulls back with a force f(x) equals to a. X b. kx c. k d. kx² 9. A spring has a natural length of 20 cm. A 40 N force is required to stretch the spring to a length of 30 cm. How much work (in Joules) is done in stretching the spring from 35 cm to 38 cm ? [Note: 1 Joule= 1 Newton-meter ] (A) 1.25 (B) 1.98 (C) 3.52 (D) 4.00 10. A tank full of water is in the shape of a box 3m deep, 4m long and 3m wide. What is the differential volume? a. 6dy b. 12dy c. 12 π dy d. 2.25dy
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