Abag of cement weighting 325n hangs in equilibrium from three wires suggested in traffic light. two of the wires make angles ø1=60° and ø2=40° with the horizontal. assuming the system isvin equilibrium ´find the tension t1 ,t2 and t3 in the wires.

T1 = 165 [N], T2 = 253 [N], T3 = 325 [N]

Explanation:

In order to solve this problem, we need to outline the conditions that are being described.

In the attached image we can find the sketch of the problem.

We perform a sum of forces on the Y & axis determine Equation (1). Then we perform a sum of forces on the X & axis determine Equation (2). Then we replace Equation 2 in 1 t we can find T1 then we replace in Equation (2) and we find T2. This analysis is based on Newton's third law.

In the attached image are the equations developed and developed

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note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.