Question

In moving out of a dormitory at the end of the semester, a student does1.6×10^4Jof work. In the process, his internal energy decreases by4.2×10^4JDetermine each of the following quantities (including the algebraic sign):(a)W,(b)ΔU, and (c)Q

Answer 1

W = 1.6 × 10⁴ J , ΔU = - 4.2 x 10⁴ J , Q = - 2.6 x 10⁴ J

Step-by-step explanation:

given,

Work done by the student

W = 1.6 × 10⁴ J

decrease in internal energy

ΔU = - 4.2 x 10⁴ J

Using formula for heat

Q = W + ΔU

Q = 1.6 × 10⁴ J + ( - 4.2 x 10⁴ J)

Q = - 2.6 x 10⁴ J

Hence,

W = 1.6 × 10⁴ J , ΔU = - 4.2 x 10⁴ J , Q = - 2.6 x 10⁴ J