A source emits 4×10²⁶ W. What is the energy (in Joules) emitted in 1000 years? Use 1 yr ≈ 3×10⁷ s. Enter in exponential notation e.g. 1.1e15.

If y ∝ x² and x is doubled, by what numerical factor does y change?

Evaluate 1.5^3.5 to two decimal places.

If the Sun's radius is about 100  times Earth's radius, roughly how many Earth volumes fit inside the Sun? Enter e.g. 1e3 or 1000.

Convert a density of 1.41×10³ kg m⁻³ into g cm⁻³. Enter the numerical value only.