In which situation is a person doing work on an object? a. A school crossing guard raises a stop sign that weighs 10 N.
b. A student walks while wearing a backpack that weighs 15 N.
C. A man exerts 350 N force on a rope attached to a house.
d. A worker holds a box 1 m off the floor.

Which of the following statements are true for an isothermal process? check all that apply. - during an isothermal process, the work done by the gas equals the heat added to the gas. - during an isothermal process, the internal energy of the system changes. - an isothermal process is carried out at constant temperature. - an isothermal process is carried out at constant pressure. - an isothermal process is carried out at constant volume.