Hello, I need a hand with this.. 1) A spring stretches by 21.0 cm when a 135 N o

Question

Hello, I need a hand with this..

1) A spring stretches by 21.0 cm when a 135 N object is attached. What is the weight of a fish that would stretch the spring by 68.5 cm?
A) 616 N B) 241 N C) 41.0 N D) 440 N
2) An object attached to an ideal massless spring is pulled across a frictionless surface. If the spring constant is 45 N/m and the spring is stretched by 0.88 m when the object is accelerating at 2.4 m/s2, what is the mass of the object?
A) 22 kg B) 14 kg C) 17 kg D) 19 kg

6) A force on a particle depends on position such that F(x) = (3.00 N/m2)x2 + (2.00 N/m)x for a particle constrained to move along the x-axis. What work is done by this force on a particle that moves from x = 0.00 m to x = 2.00 m?
A) 16.0 J B) 32.0 J C) 12.0 J D) 10.0 J E) -32.0 J
7) A person pushes horizontally on a heavy box and slides it across the level floor at constant velocity. The person pushes with a 60.0 N force for the first 5.06 m, at which time he begins to tire. The force he exerts then starts to decrease linearly from 60.0 N to 0.00 N across the remaining 5.06 m. How much total work did the person do on the box?
A) 680 J B) 607 J C) 455 J D) 364

Please, help me with this work, I need step by step process, and if you can in a clear handwritting or way, thanks!!!

Explanation / Answer

1) Using

F = -kx

or

F1/x1 = F2/x2

135/21 = F2/68.5

F2 = 440.36 N

Hence answer is option D

2) F = kx = ma

45*0.88 = m * 2.4

m = 16.5 kg ~ 17kg

Hence answer is option C

Related Questions

Navigate

• Browse (All)
• Browse H
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.