A certain coin has a diameter of 21.21 mm, a thickness of 1.95 mm, and weighs 0.04905 N. What is its density? A) 29.1 × 10³ kg/m³ B) 7.26 × 10³kg/m³ C) 9.25 × 10³ kg/m³ D) 2.31 × 10³ kg/m³ E) 71.2 × 10³ kg/m³

Question

Quizplus · Accepted Answer

To find the density, use the formula density = mass/volume. First, calculate the volume of the coin using the formula for the volume of a cylinder: V = πr²h, where r is the radius (10.605 mm = 0.010605 m) and h is the thickness (1.95 mm = 0.00195 m). Then, convert the weight to mass using mass = weight/g (0.04905 N / 9.81 m/s²). Finally, divide the mass by the volume to find the density, which is approximately 7.26 × 10³ kg/m³.

A Certain Coin Has a Diameter of 21