# An object with a mass of #7 kg# is hanging from a spring with a constant of #3 (kg)/s^2#. If the spring is stretched by # 12 m#, what is the net force on the object?

The net force is

Let's resolve in the vertical direction

The net force is

The force is acting downwards,

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The net force on the object is 36 N.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

- An object with a mass of # 4 kg# is lying on a surface and is compressing a horizontal spring by #8 cm#. If the spring's constant is # 6 (kg)/s^2#, what is the minimum value of the surface's coefficient of static friction?
- A box with an initial speed of #9 m/s# is moving up a ramp. The ramp has a kinetic friction coefficient of #5/4 # and an incline of #(3 pi )/4 #. How far along the ramp will the box go?
- An object with a mass of # 3 kg# is lying on a surface and is compressing a horizontal spring by #8 cm#. If the spring's constant is # 2 (kg)/s^2#, what is the minimum value of the surface's coefficient of static friction?
- Can we say that Tension is also a form of normal reaction? as whenever we apply force on a wire or rope,it applies counter force on us which is tension,which is perpendicular to us.
- An object, previously at rest, slides #9 m# down a ramp, with an incline of #(pi)/12 #, and then slides horizontally on the floor for another #32 m#. If the ramp and floor are made of the same material, what is the material's kinetic friction coefficient?

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