Classify the following trusses as either unstable (U), determinate (D), or indeterminate (I).

(a) 

(b)

(c)

The truss shown has a horizontal load of P= 1.7 kN applied at joint B.  

Using the Method of Joints, calculate the force in member BC (in kN). Indicate whether the member is in tension or compression by using the '-' for compression and no sign for tension. 

Do NOT include any units.

Give your answer to 1 decimal place.

When using Method of Joints, which node(s) could your analysis begin at to determine the forces in each member of the truss shown? Assume the reaction forces are all known.  

When using Method of Joints, which node would you analyse to determine the internal forces in members AB & BC of the truss shown?

In the truss system below, with the loading as shown, member BC;

Determine the mass of A required to keep the system in equilibrium if block B has a mass of kg? Consider the gravitational acceleration to be m/s². Provide your answer in kg to 4 decimal places.

Determine the mass of the block required to keep the system in equilibrium if is N. Consider the gravitational acceleration to be m/s². Provide your answer in kg to 4 decimal places.

A pulley system with a mechanical advantage of is used to raise an object of mass kg. What distance does the input force need to be applied over to raise the object by m?

A spring stretches mm per newton of applied force. An object is suspended from the spring, and a deflection of mm is observed. What is the mass of the object? Consider the gravitational acceleration to be m/s².

Which of the following equations describes the equivalent spring stiffness for two springs in a series configuration with stiffnesses and ?