the centre of mass of the apple is 25cm from the pivot and the centre of mass of the weight is 45cm from the pivot. calculate the weight of the apple

How are positive ions different from neutral atoms

What is the magnitude of the gravitational force acting on the earth due to the sun?

The flame produced by the burner of a gas (propane) grill is a pale blue color when enough air mixes with the propane (c3h8) to burn it completely. for every gram of propane that flows through the burner, what volume of air is needed to burn it completely? assume that the temperature of the burner is 195.0°c, the pressure is 1.05 atm, and the mole fraction of o2 in air is 0.210.