Can someone me in 4 and 5 i just wanna know if i’m right that’s why plzz and thx

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?

Why is the use of carbon-14 limited

Which of the following is not a physical property of mattera. melting pointb.heat of combustionc. viscosityd. boiling point