An official regulation tennis ball is about 2.6 inches in diameter. How many tennis balls could you fit, end-to-end, in between the Earth and the Moon?

What's mu? If p has a unit of [kg/m³), v has a unit of [m/s], D has a unit of [m], and Ris unitless, what is the unit of u in the equation R = vDp/µ? O [s/kg] O [kg/(m• s)] O [kg/s] O [(m• s)/kg]

A = 2 X 1025, B = 4.5 X 10-10, C = 3 X 10-6. AB/C = ?       (2) ACB = ?       (3) The Moon is approximately 400,000 km from the Earth.  An atom of a certain element has a diameter of 4 X 10-8 cm. Given 1 km = 1,000 m and 1 m = 100 cm, about how many atoms of this element can be lined up between Earth and Moon?             (4) A spherical planet has a radius of 2,000 km and a mass of 1025 kg. Calculate its density (mass/volume) in kilograms per cubic meter.           (5) How many of the atoms in Question (3) can fit within a spherical planet with a diameter of 2 X 104 km?           (6) An asteroid’s radius is 200 m and its distance from Earth is 107 km. What angle in degrees (θ) will it subtend? Use the equation  θ = 57 (diameter) / distance

The surface of a lake has an area of 15.5 km². What is the area of the lake in m²? 1.55 × 108 m² 1.55 x 106m² 1.55 × 105 m² 1.55 × 104 m² 1.55 × 107 m²