An elastic cord is 80 cm long when it is supporting a mass of 10 kg hanging from it at rest at rest. when an additional 4 kg is added, the cord is 82.5 cm long. what is the length of the cord when no mass is hanging from it? (spring constant = 1600 n/m)
the actual answer is 73.75 cm, so i was wondering how you got to that answer? .

The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.

The electric potential v is constant everywhere within a certain region of space. which statement below is true? the choices are: the electric field is also constant (but not zero) within the region. a charged particle placed within the region will experience an electric force. the electric field is zero everywhere within the region. the electric field varies from place to place within the region.

Write a polynomial function with the given zeros x= -1,0,2show your work