A mass, M, is at rest on a frictionless surface, connected to an ideal horizontal spring that is unstretched. The other end of spring is attached to wall. A person extends the spring 30 cm from equili

Question

A mass, M, is at rest on a frictionless surface, connected to an ideal horizontal spring that is unstretched. The other end of spring is attached to wall. A person extends the spring 30 cm from equilibrium and holds mass at this location by applying a 10 N force. The spring is brought back to equilibrium and the mass connected to it is now doubled to 2M. If the spring is extended back 30 cm from equilibrium, what is the necessary force applied by the person to hold the mass 2M stationary there?

Options:

Answer:

C

Solution:

The spring force depends only on the extension: $F = k x$ . The mass is at rest, so the person's force equals the spring force.

Both times the extension is 30 cm, so the force is the same, $10 N$ , independent of the mass.

TestHub · Accepted Answer

The spring force depends only on the extension: $F = k x$ . The mass is at rest, so the person's force equals the spring force.

Both times the extension is 30 cm, so the force is the same, $10 N$ , independent of the mass.

Physics - NLM Question with Solution | TestHub

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