# Physic

posted by .

An unstretched spring is 11.0 cm long. When you hang an 590 g weight from it, it stretches to a length of 14.0 cm. what is the force constant in (N/m) of this spring? what is the total mass must you hang from the spring to stretch it to a total length of 18cm?

• Physic -

x = 14-11 = 3 cm = .03 m
F = m g = .59kg * 9.81 = 5.79 N
k = F/x = 5.79/.03 = 193 n/m

F = 193 (.18-.11) = 13.5 N
m = F/g = 13.5/9.81 = 1.38 kg = 1380 g

## Similar Questions

1. ### physic

Hooke's law describes a certain light spring of unstretched length 30.0 cm. When one end is attached to the top of a door frame, and a 8.40-kg object is hung from the other end, the length of the spring is 40.00 cm. (a) Find its spring …
2. ### physic

a force of 3.5 N is applied to a spring which obeys Hooke's law and produces and extension of 0.07m. calculate the spring constant what is the size of the force that will produce and extension of 4.0 cm caluclate the unstretched length …
3. ### Math

A plumber charges \$45 for a service call, plus \$70/h for her time. a. Find the cost of a two hour service call. b. How long was a services call that cost \$150?
4. ### Math

The distance a spring stretches is directly proportional to the force applied to the spring. A 4-lb weight stretches a spring 20 in. A 16-lb weight stretches a spring 26 in. Find the length of the spring with no weight attached.
5. ### aaa

You find that if you hang a 1.85 weight from a vertical spring, it stretches 5.50 . What is the force constant of this spring in N/m?
6. ### Math

as the weight held by a spring increases, the length of the spring increase proportionally. suppose a 2-lb weight stretches a spring to 15 in., and a 12-lb weight stretches the same spring to 20 in. what is the length of the spring …
7. ### physics

1)An elastic material has a length of 36cm when a load of 40N is hung on it and a length of 45cm when a load of 60N is hung on it. The original length of spring is?
8. ### Physics

A single mass (m1 = 3.2 kg) hangs from a spring in a motionless elevator. The spring constant is k = 253 N/m. 1) What is the distance the spring is stretched from its unstretched length?
9. ### Physics

A spring of unknown force constant is attached to a rod so that it hangs vertically. With no mass attached, the spring has a length of 12.0 cm. When a student attaches a mass of 50 grams, the spring stretches to a length of 18.0cm. …
10. ### 1Physics

One end of a spring is attached to the ceiling. The unstretched length of the spring is 10.0 cm. A 2.0 kg mass is hung from the other end of the spring. It is slowly lowered until it comes to rest. At this point the spring is 15 cm …

More Similar Questions