Steel Wine Rack

March 5, 2010 7:54 am | Uncategorized

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steel wine rack
The Tension Force, Equilibrium Applications in Newton’s Second Law?

I was absent today, any help with the Physics would be greatly appreciated!
Thanks! :)
A 92kg baseball player slides into second base. The coefficient of kinetic friction between the player and the ground is uk=0.61. (a) What is the magnitude of the frictional force? (b) If the player comes to rest after 1.2s what is his initial speed?

A 1.40kg bottle of wine is lying horizontally in a rack. The two surfaces on which the bottle rests are 90.0 degrees apart, and the right right surface makes an angle of 45.0 degrees with respect to the ground. Each surface exerts a force on the bottle that is perpendicular to the surface. What is the magnitude of each of these forces?

A steel beam has a weight of 8.00kN and is being lifted at a constant velocity. What is the tension in each cable attached to its ends? (70.0 degree angles)

a) Friction force = coefficient of friction (mu) times normal force.

The normal force is equal to his weight: mg

So friction force = mu * m * g

They give you mu and m. You know g. Plugnchug.

b) His acceleration is mu * g

time to stop = initial velocity / acceleration

So v initial = at = mu * g * t

2) The two foces have a vertical component of F * cos (45). So together, they have a vertical compenent of 2F cos (45) = F sqrt (2). So if F sqrt (2) = weight = mg, then
F = mg / sqrt (2)

3) I need to see a picture to do this. The key is that the sum of the forces and the sum of the torques has to be zero.

Sum of forces = T1 + T2 – mg = 0
Sum of torques = ? = 0

Stainless Steel Wine Rack


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