A 8.0-cm -long spring is attached to the ceiling. When a 2.1 kg mass is hung fro

Question

A 8.0-cm -long spring is attached to the ceiling. When a 2.1 kg mass is hung from it, the spring stretches to a length of 17 cm .

Part A

What is the spring constant k ?

Express your answer to two significant figures and include the appropriate units.

k=

Part B

How long is the spring when a 3.0 kg mass is suspended from it?

Express your answer to two significant figures and include the appropriate units.

A 8.0-cm -long spring is attached to the ceiling. When a 2.1 kg mass is hung from it, the spring stretches to a length of 17 cm .

Part A

What is the spring constant k ?

Express your answer to two significant figures and include the appropriate units.

k=

Part B

How long is the spring when a 3.0 kg mass is suspended from it?

Express your answer to two significant figures and include the appropriate units.

y =

Explanation / Answer

m=2.1kg, x=0.17-0.08 =0.09m

=> m*g =k*x

=>2.1*9.81 =k*0.09 =>k=2.1*9.81/0.09 =228.9N/m

B)

3*9.81 =228.9*x =>x=3*9.81 /228.9 =0.128m =12.8cm

(12.8+8) cm= 20.8 cm. (12.8 cm is stretched length ; 8 cm is original length of the spring)

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