Question

this table shows four examples of experiments. which describes who will record their measurements in joules?
four experiments
lily: measure the energy change in a compressed spring
astrid: measure the energy change when rolling a ball downhill
henry: measure the work being done when a dart is thrown.
bob: measure the work being done when a box is lifted to a shelf.
lily and henry
astrid and bob
lily, astrid, henry, and bob
astrid, henry, and bob

Explanation:

Step1: Recall the unit of energy and work

The unit of energy and work is the joule ($J$).

Step2: Analyze each person's experiment

• Lily measures energy change (energy has unit joule).
• Astrid measures energy change (energy has unit joule).
• Henry measures work (work has unit joule).
• Bob measures work (work has unit joule).

Answer:

Lily, Astrid, Henry, and Bob