The child on a swing can be modeled as a simple pendulum. The period of a simple pendulum is given by
<span>Density is a physical
property which describes the mass of a substance per unit of volume of the
substance. It is expressed as Density = m / V. We calculate as follows:
Density = m / V
V = volume of a cube = (edge length) ^3 = (2.65 cm) ^3 = 18.61 cm^3
Density = 50.3 g / 18.61 cm^3 = 2.70 g / cm^3</span>
Answer: 
Explanation:
Given
Power 
Distance from the light source 
Intensity is given by

Inserting values

A. An indirect measure of heat energy