Question

4. A frog in a hemispherical pod, as shown in the figure on the right, just floats without sinking into a sea of blue-green ooze with density 1,35 g/cm3. If the pod has radius 6.00 cm and negligible mass, what is the mass of the frog?

Answer 1

$m=\rho V=\frac {2\pi r^3\rho}3=610~g.$