Recent content by ctjen

What grade level is this project? Chris

How did you determine that the fan exerts a force of 15N? Do you have a controlled way to rotate the electric motor? For example, an eggbeater crank style hand drill or a variable speed electric hand drill? Do you have a volt meter and some resistors so you can put a load on the motor and...

What will be the velocity of the wind source used to test this device? How will you apply the 15N horizontal force to test the tower for rigidity? Chris

I'm not sure why you're concerned about the height.

Using your descriptors T2=F1*e^[(mu_sub_k)*(theta)] mu_sub_k is the kinematic coefficient of friction. theta is the angle of revolutions the string has made around the pulley in radians (2*pi for once around). If you use a known weight to tension T2 and measure F1 you can calculate...

Can you use an cup style anemometer as a rotor? I believe the formulas for these are readily available. How tall will your tower be? Chris

The idea is to wrap the pulley enough times so that the force F1 is negligible. Then the torque equals T2*r or Weight*r. Adjusting the number of wraps and the takeoff angle to get F1 small would be simple in practice and I'm sure this is why they use this configuration of torque measurement...

The centroid is 1/3 the perpendicular distance from any selected base to the opposite vertex marked out on the median from that base to that vertex. It works for all planar triangles. For the center of mass to be coincident with the centroid the lamina comprising the triangle must be of...

A single strap tied to the floor at each end will pull the item placed between the tie points against the floor with a force that is equal to twice the tension force in the strap. The load on the floor underneath the item will be distributed according to the area of contact (force/area=stress)...

I'm pretty sure that this problem has to do with the R-L time constant. For clarification though what does I_0 represent (in words please)? Chris

Do you have specifically designed strong points to tie the straps to? If so do they have a rating? If not,to what are you securing the straps? Chris

For starters the wording of this problem is somewhat confusing. "Assume that if a customer requests Strength k, then Itsa Steel may, if it chooses, supply the demand by a beam of possibly greater Strength j, where j < k." Does this mean that the weight of the j beam is less than the k beam...

Can you clarify your diode notation. It seems ambiguous. Chris

Can you say any more about how you're going to form the rotor out of straws?

Looking at it again I should have said "Dissipates energy..." with dissipation indicating the time factor of power. Chris