Two flywheels of negligible mass and different radii are bonded together and rotate about a common axis (see below). The smaller flywheel of radius 21 cm has a cord that has a pulling force of 50 N on it. What pulling force (in N) needs to be applied to the cord connecting the larger flywheel of radius 34 cm such that the combination does not rotate

The pulling force applied to the cord connecting the larger flywheel is 30.88 N

Explanation:

Given;

the radius of the smaller flywheel, r₁ = 21 cm

force on the cord of the smaller flywheel, F₁ = 50 N

the radius of the larger flywheel, r₂ = 34 cm

The torque on each flywheel is equal, since there is no rotation.

τ = Fr

where;

τ is torque on each flywheel

F is the force on the cord of each flywheel

r is the radius of each flywheel

F₁r₁ = F₂r₂

Therefore, the pulling force applied to the cord connecting the larger flywheel is 30.88 N

b.a device that inputs heat into a cool object

this could be newton#'s law of cooling. the cooling curve is exponential