22. IP A school yard teeter-totter with a total length of 5.2 m and a mass of 36 kg is pivoted at its center. A 18 kg child sits on one
end of the teeter-totter. (a) Where should a parent push verti
cally downward with a force of 210 N in order to hold the
teeter-totter level? (b) Where should the parent push with a
force of 310 N? (c) How would your answers to parts(a) and (b)
change if the mass of the teeter-totter were doubled? Explain.

Adisk with a radius of r is oriented with its normal unit vector at an angle q with respect to a uniform electric field. which of the following would result in an increase in the electric flux through the disk? check all that apply? a. increasing the area of the disk b. decreasing the given orientation angle of the disk c. decreasing the strength of the electric field d. increasing the given orientation angle of the disk, but not exceeding an angle of 90