Ahorizontal clothesline is tied between 2 poles, 12 meters apart. when a mass of 4 kilograms is tied to the middle of the clothesline, it sags a distance of 5 meters. what is the magnitude of the tension on the ends of the clothesline?

T=26.03 N

Explanation:

Given that

Distance between poles = 12 m

Mass of block m= 4 kg

Sag distance = 5 m

Lets take tension in the clothesline is T.

The component of tension in vertical direction will be T cosθ.

By force balancing

2 T cosθ = 40

here

θ=39.80°

2 T cos39.8 = 40

T=26.03 N

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

your answer is c! hope this : )