Why are planets closer to the sun made of different substance than planets father from the sun?

An elements atomic number is 30. How many protons would an atom of this element have?

Marissa drags a 23 kg duffel bag 18 m across the gym floor. if the coefficient of kinetic friction between the floor and bag is 0.15, how much thermal energy does marissa create?

Почему Земля не может получить от Солнца тепло через теплопроводность или конвекцию?

Two objects with different masses accelerate at the same rate according to newton's 2nd law, what must be true about the forces pushing objects?

What are three basic conditions for a hurricane to form

Why do atoms move at different speeds depending on wether they are liquids or solids

What are the arrangement of resistors in series

A cell provides 6 V to an LDR. The current through this LDR is measured and is found to be 3 A. What is the resistance of the LDR?

A car travels along eastward with a constant velocity. the magnitude of the acceleration of the car is

What is the weight of a 65 kg astronaut on mars?