The mass of an electron is a) equal to the mass of the proton and the neutron b) higher than the mass of the proton or the neutron c) not significant to the overall mass of the atom

Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells? burning fossil fuels contributes to climate change. burning fossil fuels takes place inside expensive fuel cells. fossil fuels aren't widely available, but pure hydrogen is. fossil fuels are nonrenewable.

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.